CN103230944B - Self-powered wireless sensor node used for deviation detection of cold-rolled strip steel in loop area - Google Patents

Abstract

The invention provides a self-powered wireless sensor node which obtains kinetic energy of a loop trolley cylinder by utilizing friction drive, drives a generator to generate electric energy through a speed-up drive mechanism, reaches a requirement on a power output through rectification and voltage regulation, supplies power to a strip steel deviation detection sensor and sends strip steel position information to a corresponding data receiver in a wireless way. The scheme satisfies the requirement of the strip steel deviation wireless detection node on the power source under a moving condition, solves the problems of wiring difficulty and hard replacement of batteries, is convenient and flexible, is capable of carrying out on-line detection for the deviation phenomenon of the cold-rolled strip steel, judging the axial position of the strip steel rapidly and exactly and providing in-time and exact feedback control signals for a deviation correction system, and is good for avoiding occurrence of accidents and improving stability of the cold-rolled strip steel production system and safety of product production operation.

Description

For the self-power wireless sensor node that loop area cold-strip steel centring detects

Technical field

The present invention relates to systems axiol-ogy field, more specifically, relate to a kind of self-power wireless sensor node detected for loop area cold-strip steel centring.

Background technology

In the production of band steel, equipment, supplied materials, technique and operational problem all can cause strip running deviation.Strip running deviation can bring very large harm, the quality of influence zone steel to production, makes coil edges uneven.Damage can be caused to equipment when sideslip is serious, have a strong impact on production and normally carry out, cause heavy economic losses.

Because the deviation-rectifying system on cold rolled strip steel production line is limited in one's ability, therefore, strip running deviation phenomenon can be detected as early as possible when being with steel side-play amount less, and send alarm condition to deviation correction control system in time, to avoiding the generation of major accident, improving the quality of products, enhancing productivity, ensure that production safety etc. all has great importance.

In kink region, loop trolley is the optimum position detecting cold-strip steel whether sideslip.But loop trolley is kept in motion, therefore, to power in cable mode and the mode of transmission signal is difficult to be suitable for.General wireless sensor node monitoring node all adopts powered battery, but the limitation such as by the impact of power consumption, powered battery exists battery altering difficulty, cannot monitor continuously, affect stability and the continuity of detection system.

Summary of the invention

Difficult in order to solve wireless sensor node wiring in prior art, the problems such as system power dissipation is large, battery altering is difficult, realize node to the monitoring of being with steel position convenient, flexible for a long time, the invention provides a kind of self-powered type wireless sensor node, be continuously sensor power, avoid changing battery continually, achieve the continous-stable operation of sensor.

Technical scheme of the present invention is as follows:

For the self-power wireless sensor node that loop area cold-strip steel centring detects, it is characterized in that:

Comprise kinetic energy and obtain mechanism (2), generator (1), circuit (102), lead-acid accumulator (103), power management module and sensor (104), described kinetic energy obtains the input of structure (2) and cylinder (100) frictional drive of loop trolley, and the output that described kinetic energy obtains structure (2) is connected with described generator (1) and drives described generator (1) to generate electricity; Described circuit (102) processes the electricity that described generator (1) sends, and powers to described sensor (104); Described sensor (104) is for band steel, whether sideslip is detected and the mode of detection signal by wireless transmission sent by circuit (102), and described sensor (104) is arranged on band steel edge position.

Further, described kinetic energy obtains mechanism (2) and comprises friction pulley (3), power transmission shaft (4), the first drive (5) and the second drive (6), cylinder (100) CONTACT WITH FRICTION of described friction pulley (3) and described loop trolley, described friction pulley (3) drives described first drive (5) to rotate by power transmission shaft (4), described first drive (5) coordinates transmission with described second drive (6), and described second drive (6) drives described generator (1) to generate electricity.

Further, described first drive (5) is provided with rubber ring (7), described second drive (6) is friction mandrel, described first drive (5) and described second drive (6) frictional drive.

Further, the gearratio between the cylinder (100) of described loop trolley and described friction pulley (3) is i _i, the gearratio between described first drive (5) and described second drive (6) is i _iI, the gearratio between described cylinder (100) and described second drive (6) is i=i _ii _iI, i>=110.

Further, also comprise a bistable mechanism, described mechanism comprises base (8), travelling carriage (9), linear rolling track (10), leading screw (11), nut (22), slide block (23) and rotates handwheel (16); Described rotation hand wheel (16), leading screw (11) above slide at linear rolling track (10) with travelling carriage (9), travelling carriage (9) other end presses generation thrust against the first spring (17), the buffer structure of the first spring (17) avoids due to rigid contact, the movement of travelling carriage (9) on base (8) is realized by linear rolling track (10), travelling carriage (9) can in upper respect thereto (8) rectilinear movement of linear rolling track (10), tighten stop nut (21) lead screw position to be fixed, realize stable duty;

Described bistable mechanism can realize described generator (1) and switch in working order and between off working state.

Further, also comprise hold-down mechanism, described hold-down mechanism forms the first hold down gag by the first spring (17), travelling carriage (9), leading screw (11) etc., by cylinder (100) elastic compression of described friction pulley (3) and described loop trolley; And form the second hold down gag by generator (1), motor fixing plate (18), motor baffle plate (19), the second spring (20), by described second drive (6) and described first drive (5) elastic compression; Motor baffle plate (19) is fixed on travelling carriage (9), motor fixing plate (18), along the skewed slot track of travelling carriage (9) and moving axially of spring, utilizes the pretightning force between motor baffle plate (19) and the second spring (20) to be pressed on by friction mandrel on the rubber ring (7) of large belt wheel.

Further, described power module comprises power management module, Master control chip and radio-frequency module, described power management module comprises three phase rectifier module, SEPIC topography module, two-stage DC-DC voltage reduction module and charge in batteries administration module and battery, rectification is carried out to the three-phase alternating current that described generator (1) exports, export the direct current for about 0-40V, through the pressure regulation of SEPIC topography module, be that direct current 17V exports by voltage stabilization, by charge management module, floating charge is carried out to lead-acid accumulator, lead-acid accumulator output voltage is 12V, 3.3V and 5V voltage is exported to main control circuit through two-stage DC-DC voltage reduction module, radio circuit and sensor are powered, described Master control chip is monitored for the information about power to battery, sensor interface and is gathered, and carry out Wireless Data Transmission by radio-frequency module.Circuit is reserved with generator output interface, sensor interface and lead-acid accumulator discharge and recharge interface.

Further, described generator (1) output with between described Master control chip, described sensor body (2) is all connected by the form of connector with between described Master control chip.

Technical scheme provided by the invention, frictional drive is utilized to obtain the kinetic energy of loop trolley cylinder, generator is driven to produce electric energy by speed booster driving mechanism, again through over commutation, filtering, pressure regulation, reach the requirement that power supply exports, power to strip running deviation detecting sensor, and wirelessly band steel positional information is sent to corresponding data sink.The program to meet under moving condition strip running deviation radio detection node to the requirement of power supply, solve wiring difficult, battery altering problem not easily, flexibly and easily, on-line checkingi can be carried out to cold-strip steel centring phenomenon, judge the axial location of band steel quickly and accurately, for deviation-rectifying system provides feedback control signal promptly and accurately, help avoid the generation of contingency, improve the security of the cold rolled strip steel production stability of a system and production operation.

Accompanying drawing explanation

Fig. 1 is the composition structure chart according to self-power wireless sensor node of the present invention;

Fig. 2 is the overall structure figure according to mechanical part in self-power wireless sensor node of the present invention;

Fig. 3 is the structural representation of transmission module in Fig. 2;

Fig. 4 is the structural representation of bistable mechanism in Fig. 2;

Fig. 5 is the structural representation of hold-down mechanism in Fig. 2;

Fig. 6 is the circuit structure layout according to self-power wireless sensor node of the present invention;

Fig. 7 is global source scheme schematic diagram;

Fig. 8 is three phase full wave rectification bridge schematic diagram;

Fig. 9 a is SEPIC topological circuit schematic diagram;

Fig. 9 b is the corresponding relation figure of maximum duty cycle and output frequency;

Fig. 9 c is the graph of a relation of crystal oscillator frequency and RT/CT;

Figure 10 is lead-acid accumulator floating charge circuit theory diagrams;

Figure 11 is that 12V turns 5V circuit theory diagrams;

Figure 12 is that 5V turns 3.3V circuit theory diagrams;

Figure 13 is master chip circuit theory diagrams;

Figure 14 is CC1100 radio-frequency module peripheral circuit schematic diagram;

Figure 15 is the scheme of installation according to self-power wireless sensor node of the present invention.

Detailed description of the invention

Be described in detail below in conjunction with the structure of accompanying drawing to self-power wireless sensor node of the present invention; those skilled in the art is to be understood that; the following stated is a preferred embodiment of the present invention, and protection scope of the present invention is not by the restriction of following embodiment.

As shown in Fig. 1 to 15, self-power wireless sensor node of the present invention is divided into mechanical part and circuit part, and its unitary construction as shown in Figure 1.

The major function of mechanical part is: according to the input requirements determination gearratio of cylinder 100 and generator 1, is realized the power input of generator 1 by the suitable kind of drive.Need design bistable structure in addition, switch flexibly in working order and between idle condition (i.e. off working state) to realize generator 1.

According to the requirement of system to structure, as shown in Figure 2, the overall structure of this programme comprises the design of mechanical part: the bistable structure be made up of base 8, travelling carriage 9, linear rolling track 10, screw-nut body etc.; The transmission mechanism be made up of friction pulley 3, bearing block 12, power transmission shaft 4, large belt wheel (i.e. the first drive 5), friction mandrel (i.e. the second drive 6) etc.; And the hold down gag to be made up of generator 1, motor fixing plate 13, motor baffle plate 14, spring 15, stop nut 21 etc.

The structure of transmission mechanism as shown in Figure 3, is made up of friction pulley 3, power transmission shaft 4, large belt wheel (i.e. the first drive 5), rubber ring 7, friction mandrel (i.e. the second drive 6) and generator 1.Mechanism transmits kinetic energy by the friction between friction pulley 3 and loop trolley cylinder 100, then drives large belt wheel to rotate by power transmission shaft 4.Be arranged on the friction mandrel on generator 1 power shaft and rubber ring 7 contact friction on large belt wheel, so just kinetic energy passed to generator, and generated electricity by generator rotation.Whole energy transfer process is: cylinder → friction pulley → power transmission shaft → belt wheel → friction mandrel → generator.

Drive system ratio is:

i=i _I·i _II，

i _I=d ₁/d ₂，

i _II=d ₃/d ₄，

In formula: d ₁for diameter of cylinder; d ₂for friction pulley diameter; d ₃for large pulley diameters; d ₄for friction mandrel diameter.

By: d ₁=1200mm, d ₂=125mm, d ₃=310mm, d ₄=26mm

: i=d ₁d ₃/ d ₂d ₄=114.

The range of speeds of loop trolley cylinder is ω _i=4.7 ~ 78r/min, this transmission scheme two-stage is accelerated all to adopt frictional drive, and the transmission efficiency of flat frictional drive is 0.85 ~ 0.92, gets η 1=η 2=0.85, then the generator input speed scope after speedup is: ω _o=η ₁η ₂i ω _i=387 ~ 6424r/min.

Bistable structure as shown in Figure 4, is made up of parts such as base 8, travelling carriage 9, linear rolling track 10, leading screw 11, nut 22, slide blocks 23.Rotate handwheel 16, leading screw slides on linear rolling track 18 with travelling carriage 9, and travelling carriage 9 other end presses generation thrust against the first spring 17, and the buffer structure of the first spring 17 avoids due to rigid contact, produces under impact destroy apparatus structure.Its stroke is: L=s ₁-s ₂=87mm, in formula: s ₁=123mm, s ₂=36mm.

The movement of travelling carriage 9 on base 8 is realized by linear rolling track 10, and travelling carriage 9 can move linearly by respect thereto 8 on linear rolling track 10.

Hold-down mechanism, as Fig. 5, is made up of parts such as generator 1, motor fixing plate 18, motor baffle plate 19, second springs 20.Motor baffle plate 19 is fixed on travelling carriage 9, and motor fixing plate 18 is mobile along the skewed slot track (axis of spring) of travelling carriage 9, utilizes the pretightning force between motor baffle plate 19 and the second spring 20 to be pressed on the rubber ring 7 of large belt wheel by friction mandrel.

Utilize this hold-down mechanism, can ensure that friction mandrel and large belt wheel are with certain thrust close contact, can skid when too fast or speed cataclysm at rotating speed again, play protection, prevent the effect impacted.

Circuit part is made up of three kinds of functional modules: power management module, wireless radio frequency modules, main chip module, and its structure as shown in Figure 6.

Power management module: because the loop trolley speed of service is unstable, after a series of speedup is transmitted, the voltage that generator sends is roughly 3 ~ 40V three-phase alternating current.And circuit required voltage is 12V, 5V, 3V tri-kinds of voltages, and the lead-acid accumulator of 12V7Ah is charged.The power source design of Acquisition Circuit is designed as shown in Figure 7 according to actual requirement.

Three-phase commutation bridge: rectification, becomes galvanic process alternating current exactly.The electricity that general generator sends is all alternating current, and various sensor, chip need to use direct current.Utilizing the device with unilateal conduction characteristic, can be direct current the convert alternating current of direction and size alternation.Utilize the full-bridge type rectification circuit of six crystal diode compositions, three-phase alternating current can be transformed to direct current.Fig. 8 is the schematic diagram of three phase full wave rectification bridge.

Low capacity high-frequency ceramic electric capacity C01 in circuit act as absorption surge voltage, and protection diode, stops load current transition, make electric current more steady.Large Copacity electrolytic aluminium electric capacity act as rectification, make voltage export more steady.And the high tension protection circuit that resettable fuse R0 and Transient Suppression Diode D0 forms can when voltage instantaneous surge disconnecting circuit, protection components and parts, can recover again after surge voluntarily, improve the safety and reliability of system.

Direct current 4V to 40V changes the regulating circuit of input: according to the power generation situation at scene, generator output voltage fluctuates in 4-40V, and lead acid battery charge circuit required voltage is 17V, and the design adopts the pressure regulation of SEPIC topological realization buck.As illustrated in fig. 9, maximum output current is 2A to circuit theory diagrams.

Dutycycle D:

$\frac{V_O}{V_{\mathrm{IN}}}=\frac{D}{1-D};$

Calculate D _mAX=0.79.

The output inversion frequency of RC oscillating circuit He Ne laser: MAX15005 is identical with RC oscillating circuit frequency of oscillation.Namely the RC oscillation network being connected to RT, CT pin controls frequency of oscillation and also controls maximum duty cycle.When given inversion frequency and maximum duty cycle, obtain rough capacitance according to Fig. 9 b and Fig. 9 c, then adjust the maximum duty cycle under switching frequency and worst condition by following formulae discovery resistance value.

$t_{\mathrm{CHARGE}}=\frac{D_{\mathrm{MAX}}}{f_{\mathrm{OSC}}}\mathrm{LLLLLLLLLLLLLLLLLLL}---\left(1\right)$

$\mathrm{RT}=\frac{t_{\mathrm{CHARGE}}}{0.7\×\mathrm{CT}}\mathrm{LLLLLLLLLLLLLLLLLLL}---\left(2\right)$

$t_{\mathrm{DISCHARGE}}=\frac{2.25\left(V\right)\×\mathrm{RT}\×\mathrm{CT}}{1.33\×{10}^{-3}\left(A\right)\×\mathrm{RT}-3.375\left(V\right)}\mathrm{LLLLLLL}---\left(3\right)$

$f_{\mathrm{OSC}}=\frac{1}{t_{\mathrm{CHARGE}}+t_{\mathrm{DISCHARGE}}}\mathrm{LLLLLLLLLLLLLL}---\left(4\right)$

System maximum duty cycle D _mAX=0.79, configuration switch inversion frequency is 300KHz, tentatively determines that CT capacitance is 220pF according to Fig. 9 b and Fig. 9 c.Bring formula (1), (2), (3), (4) into, calculate:

t _CHARGE=2.67us

RT=17KΩ

t _DISCHARGE=0.44us

f _OSC=321KHz。

Error amplifier: the in-phase input end of error amplifier is connected to inner 1.228V reference voltage, and feedback provides at reverse input end.Output voltage is calculated by following formula.

$V_{\mathrm{OUT}}=(1+\frac{R_A}{R_B})V_{\mathrm{REF}}\⇒\left\{\begin{array}{c}{R}_A=128K\\ R_B=10K\end{array}\right..$

Slope-compensation: a MAX15005 inner slope generater compensates slope.Inner slope signal resets when the beginning of each circulation, and the speed defined with the external capacitive be connected with SLOPE is turned round.Need the slope compensated to draw according to the descending grade of current waveform, computing formula is shown below.

$\mathrm{Slope\; compensation}(\mathrm{mV}/\mathrm{us})=\frac{2.5\×{10}^{-9}\left(A\right)}{C_{\mathrm{SLOPE}}},$

Be 110mV/us by convolution rate setting, calculate Cslope=22.7pF.

Dutycycle calculates:

$D_{\mathrm{MAX}}=\frac{V_{\mathrm{OUT}}+V_D}{V_{\mathrm{IN}-\mathrm{MIN}}+V_{\mathrm{OUT}}+V_D-(V_{\mathrm{DS}}+V_{\mathrm{CS}})}=0.866$

In formula, V _d=0.5V, V _dS=1.5V, V _cS=0.305V, η=80%.

The selection of inductance: calculate inductance value with following formula, supposes that L1, L2 are equal, and the ripple current of inductance is 20% of input current.

$L=L_1=L_2=\frac{V_{\mathrm{IN}-\mathrm{MIN}}\×D_{\mathrm{MAX}}}{2\×f_{\mathrm{OUT}}\×{\mathrm{\ΔI}}_L}=1.88\mathrm{\μH}$

${\mathrm{\ΔI}}_L=\frac{0.2\×I_{\mathrm{OUT}-\mathrm{MAX}}\×D_{\mathrm{MAX}}}{(1-D_{\mathrm{MAX}})\×\mathrm{\η}}=3.23A$

$I_{\mathrm{LPK}}=\frac{I_{\mathrm{OUT}-\mathrm{MAX}}\×D_{\mathrm{MAX}}}{(1-D_{\mathrm{MAX}})\×\mathrm{\η}}+I_{\mathrm{OUT}-\mathrm{MAX}}+{\mathrm{\ΔI}}_L=21.3A$

η=80% in formula.

The selection of field-effect transistor (MOSFET), diode and Serial capacitance:

I _LDC=I _LPK-ΔI _L=18A，

$I_{\mathrm{MOS}-\mathrm{RMS}}\left(A\right)=\sqrt{[{\left(I_{\mathrm{LPK}}\right)}^2+{\left(I_{\mathrm{LDC}}\right)}^2+(I_{\mathrm{LPK}}\×I_{\mathrm{LDC}})]\×\frac{D_{\mathrm{MAX}}}{3}}=18.3A.$

Higher conversion efficiency can be realized with Xiao Te diode.Electric current induction (Rs) calculates by current limit thresholding (0.305V) and ILPK, if SEPIC conversion needs to arrange output current short-circuit protection, can be greater than the diode of maximum output current with a forward nominal electric current.

$R_{\mathrm{CS}}=\frac{0.305}{I_{\mathrm{LPK}}}=0.0143\mathrm{\Ω},$

R _csresistance select 80%, i.e. R in above formula _cS=0.012 Ω.

Output current limits available following formula and calculates (in formula, D is dutycycle corresponding to maximum input voltage):

$I_{\mathrm{OUT}-\mathrm{LIM}}=\frac{D}{1-D}\×(I_{\mathrm{LPK}}-{\mathrm{\ΔI}}_L)=9.9A.$

The selection of Serial capacitance will realize by the ripple voltage of electric capacity minimum, recommends to adopt monolithic ceramic capacitor X5R and X7R series, uses the size of formulae discovery electric capacity CP:

$\mathrm{CP}=\frac{I_{\mathrm{OUT}-\mathrm{MAX}}\×D_{\mathrm{MAX}}}{{\mathrm{\ΔV}}_{\mathrm{CP}}\×f_{\mathrm{OUT}}}=\frac{2\×0.866}{0.05\×4.5\×321K}=28.8\mathrm{\μF}.$

Lead acid battery charge management circuit: UC3906 is sealed lead acid storage battery charging special chip, and it has whole control needed for sealed lead acid storage battery optimal charge and measuring ability.The more important thing is that it can make the various changing voltage of charger change with the change of the temperature coefficient of cell voltage, thus make sealed lead acid storage battery can reach optimal charge state in very wide temperature range.Charging circuit schematic diagram as shown in Figure 10.Wherein, LED60 is charging indicator light.

Each resistance computing formula is as follows:

Select drive current ID.Recommendation is 50uA ~ 100uA.

R _C=2.3V/I _D

R _A+R _B=R _SUM=(V _F-2.3V)/I _D

R _D=2.3V·R _SUM/(V _OC-V _F)

R _A=(R _SUM+R _X)(1-2.3V/V _T)

where:R _X=R _CR _D/(R _C+R _D)

R _B=R _SUM-R _A

R _S=0.25V/I _MAX

R _T=(V _IN-V _T-2.5V)/I _T

And: V ₁₂=0.95V _oC

V ₃₁=0.9V _F

I _OCT=I _MAX/10，

Wherein, the rated voltage of battery is 12V, and capacity is 7Ah, VIN=18V, VF=13.7V, VOC=15V, Imax=1A, ID=50uA, Vt=11.5V, It=60mA.

According to above-mentioned formula, calculate:

R _A=215.2K

R _B=12.8K

R _C=46K

R _D=403K

R _S=0.25

R _T=67

Direct current 12V turns 5V circuit: in system, and the power supply of powering to data acquisition circuit is 12V lead-acid accumulator, and power parameter is: input voltage VIN=12V, output voltage VO UT=5V, load current ILOAD=100mA.Schematic diagram as shown in figure 11.

Programmable soft start a: electric capacity and a resistance are connected to soft start (SS) pin and guarantee to start by regulation requirement.Namely SS controls soft-start time, also can control the maximum output current when routine operation, and its resistance, appearance representative value are: C ₄₀=0.1 μ F, R ₄₁=510K.

The a reference source of internal reference: 1.23V provides the electric current of maximum 100uA to REF pin.With the electric capacity of a 0.01uF, REF pin is connected to the ground.That is: C ₄₆=0.01 μ F.

The design of the selection of inductance: MAX738A to inductance does not require, because they test in interior circuit, energy is ensured, the especially efficient transmission of electrical characteristics with (MAX7__AC) inductance of 100 μ H or (MAX7__AE/AM) inductance of 33 μ H.

Direct current 5V turns 3.3V circuit: support that the voltage of circuit working has two kinds: the photovoltaic conversion of 5V can be 3.3V by the MAX640 chip that 5V and 3.3V, MAXIM company produces, and peripheral circuit is simple, is applicable to the design of this circuit.Power parameter is: input voltage VIN=5V, output voltage VO UT=3.3V, load current ILOAD=100mA.Schematic diagram as shown in figure 12.

The selection of inductance: if the little output current of the equivalent resistance of inductance can reach 225mA.High inductance value is selected in maximization for implementation efficiency, this makes it possible to the output current providing needs in input voltage range.

I _OUTMAX=100mA

I _PEAK=4×I _OUT-MAX=400mA

L=50/I _PEAK=125μH。

Output filtering torch: the best combination under reasonable expense is the electrolytic aluminium electric capacity of 100 μ F and the ceramic condenser of a 0.1 μ F.

External diode: at most of MAX640 circuit, when each LX closes, the electric current of external diode suddenly changes to peak value from 0, and in order to avoid too much current loss, diode must have opening time fast.1N5817 diode works well in high-power circuit, and loss is low when maximal efficiency.

Master chip: single-chip microcomputer type selecting is an important and thing of taking a lot of trouble, if single-chip microcomputer model is selected suitable, scm application system will reliable operation; If select improperly will cause economic waste, affect the normal operation of scm application system, just do not reach the function designed in advance even at all.

System MCU have selected Atmel company Atmega128 chip.

Figure 13 is ATmega128 and external I/O interface schematic diagram, can find out that the I/O port resource of Atmega128 can meet the demand of system.

Table 1.1 is some processors IO ports used in design of node.

The list of table 1.1 modal processor I/O interface

ATmega128 external pin	Function definition in node
		PE5、PE6、PE7	Circuit board indicator lamp
PB1、PE0、PE1、PF5	Download program mouth
		PD1、PD4、PG0、PG1、PC1、PC2、PC3、PC4	Wireless radio frequency modules CC1100 controls and communication pin
PD2、PD3	Sensor data acquisition pin
		PF3	Battery tension data acquisition pin

That radio-frequency module of the present invention adopts is a programmable RF transceiver CC1100 with extremely low power dissipation that Chipcon company releases.CC1100 is the UHF transceiver of the real monolithic of a kind of low cost, for low-consumption wireless application and design.Main circuit will be set as the ISM(industry in 315,433,868 and 915MHz, science and medical science) and SRD(short-range device) frequency band, also easily can be set to other frequencies of 300-348MHz, 400-464MHz and 800-928MHz.

RF transceiver is integrated with a highly configurable modem.Different modulation formats supported by this modem, and its data transmission rate can reach 500kbps.By opening the forward error recovery option be integrated on modem, performance can be made to get a promotion.

CC1100 is processing data packets, data buffering, burst transfers of data, clear channel estimating, quality of connection instruction and electromagnetic wave excites hardware supported is widely provided.Its main operating parameters and 64 transmission/reception FIFO(FIFO stacks) by SPI Interface Controller.

Figure 14 is the peripheral circuit of CC1100 radio-frequency module.

Above-mentioned self-power wireless sensor node can be used with reference to following steps:

Step one: TRT is fixed, be arranged on the drag-line protective cover 101 of loop trolley, as shown in figure 15;

Step 2: circuit board is connected generator output, battery, sensor and antenna, carries out fixing and precautions against earthquakes;

Step 3: adjustment handwheel, is pressed on friction pulley on cylinder, and tightens stop nut after ensureing certain thrust, prevent travelling carriage rollback;

Step 4: place receiving node in place, received RF information.

Sum up above explanation known, the present invention includes the following aspects: according to power input source design drive mechanism, transmit kinetic energy; Kinetic transformation is electric energy by design generator; Designing power supply management circuit, integrates, nurses one's health and store electrical energy; Design data Acquisition Circuit and radio sensing network is needed according to scene; Coding, realizes radio remote distance real-time state monitoring.

In sum, the band steel axial location that apparatus of the present invention are applied to band steel cold-tandem rolling production line loop area detects, and examined environment limit and device convenience, reliability consideration, have following several advantage:

1, TRT can adapt to cylinder in the excursion of 15 ~ 78r/min rotating speed is electric energy by kinetic transformation,

And by modules such as rectification, buck, voltage stabilizing, lead-acid accumulator discharge and recharges, be system power supply, and

The all needs for electricity of system can be ensured in whole production process.

2, there is the bistable structure that duty and stopped status two states manually switch.

3, Elastic Contact.Pressure between friction pulley and cylinder is loaded by the spring between travelling carriage and push rod, pressure between motor power shaft and secondary friction pulley is loaded by the spring between motor fixing frame and motor baffle plate, namely ensure that the pressure that can produce enough frictional force, turn avoid rigid contact, improve the reliability of system.

4, Wireless Data Transmission.The testing result of cold-strip steel whether sideslip is sent to corresponding data sink wirelessly, the on-line monitoring of loop trolley strip running deviation can be realized.

Claims (7)

1., for the self-power wireless sensor node that loop area cold-strip steel centring detects, it is characterized in that:

Comprise kinetic energy and obtain mechanism (2), generator (1), circuit (102), lead-acid accumulator (103), power module and sensor (104), described kinetic energy obtains the input of mechanism (2) and cylinder (100) frictional drive of loop trolley, and the output that described kinetic energy obtains mechanism (2) is connected with described generator (1) and drives described generator (1) to generate electricity; Described circuit (102) processes the electricity that described generator (1) sends, and powers to described sensor (104); Described sensor (104) is for band steel, whether sideslip detects, and testing result is exported to circuit (102), testing result sends in the mode of less radio-frequency by circuit (102), and described sensor (104) is arranged on band steel edge position.

2. self-power wireless sensor node according to claim 1, it is characterized in that: described kinetic energy obtains mechanism (2) and comprises friction pulley (3), power transmission shaft (4), first drive (5) and the second drive (6), cylinder (100) CONTACT WITH FRICTION of described friction pulley (3) and described loop trolley, described friction pulley (3) drives described first drive (5) to rotate by power transmission shaft (4), described first drive (5) coordinates transmission with described second drive (6), described second drive (6) drives described generator (1) to generate electricity.

3. self-power wireless sensor node according to claim 2, it is characterized in that, described first drive (5) is provided with rubber ring (7), described second drive (6) is friction mandrel, described first drive (5) and described second drive (6) frictional drive.

4. self-power wireless sensor node according to claim 2, is characterized in that, the gearratio between the cylinder (100) of described loop trolley and described friction pulley (3) is i _i, the gearratio between described first drive (5) and described second drive (6) is i _iI, the gearratio between described cylinder (100) and described second drive (6) is i=i _ii _iI, i>=110.

5. self-power wireless sensor node according to claim 1, it is characterized in that: also comprise a bistable mechanism, described bistable mechanism comprises base (8), travelling carriage (9), linear rolling track (10), leading screw (11), nut (22), slide block (23) and rotates handwheel (16), described rotation handwheel (16), leading screw (11) above slides at linear rolling track (10) with travelling carriage (9), travelling carriage (9) utilizes the first spring (17) to press generation thrust, the buffer structure of the first spring (17) avoids rigid contact, the movement of travelling carriage (9) on base (8) is realized by linear rolling track (10), travelling carriage (9) can in upper respect thereto (8) rectilinear movement of linear rolling track (10), tighten stop nut (21) lead screw position to be fixed, realize stable duty,

Described bistable mechanism can realize described generator (1) and switch in working order and between off working state.

6. self-power wireless sensor node according to claim 3, it is characterized in that, also comprise hold-down mechanism, described hold-down mechanism comprises by the first spring (17), travelling carriage (9), the first hold down gag that leading screw (11) forms, first hold down gag is by cylinder (100) elastic compression of described friction pulley (3) and described loop trolley, described hold-down mechanism also comprises by generator (1), motor fixing plate (18), motor baffle plate (19), the second hold down gag that second spring (20) forms, second hold down gag is by described second drive (6) and described first drive (5) elastic compression, motor baffle plate (19) is fixed on travelling carriage (9), motor fixing plate (18), along direction i.e. the moving axially of the second spring (20) of the skewed slot track length of travelling carriage (9), utilizes the pretightning force between motor baffle plate (19) and the second spring (20) to be pressed on by friction mandrel on the rubber ring (7) of large belt wheel.

7. the self-power wireless sensor node any one of claim 1 to 6 described in claim, it is characterized in that: described power module comprises power management module, Master control chip and radio-frequency module, described power management module comprises three phase rectifier module, SEPIC topography module, two-stage DC-DC voltage reduction module and charge management module and lead-acid accumulator, rectification is carried out to the three-phase alternating current that described generator (1) exports, export the direct current for 0-40V, through the pressure regulation of SEPIC topography module, be that direct current 17V exports by voltage stabilization, by charge management module, floating charge is carried out to lead-acid accumulator, lead-acid accumulator output voltage is 12V, 3.3V and 5V voltage is exported through two-stage DC-DC voltage reduction module, described Master control chip is monitored for the information about power to lead-acid accumulator, sensor interface and is gathered, and carry out Wireless Data Transmission by radio-frequency module, circuit is reserved with generator output interface, sensor interface and lead-acid accumulator discharge and recharge interface.