CN104976975A - Monitoring device for traction force of cable length counter - Google Patents

Abstract

The invention relates to a monitoring device for a traction force of a cable length counter. The monitoring device comprises a length counting wheel, a cable tractor, a two-dimensional force sensor and a sensing system signal processor. The two-dimensional force sensor is arranged on the curved surface of the length counting wheel for acquiring a positive pressure and a static friction force between the cable and the length counting wheel and transmitting the acquired positive pressure and the static friction force to the sensing system signal processor. Then the sensing system signal processor feeds the acquired positive pressure and the static friction force to the cable tractor. A sensor comprises an annular capacitor unit set and a strip-shaped capacitor unit set. The strip-shaped capacitor unit set is arranged at four corners outside the annular capacitor unit set of a substrate or the circle center of the annular capacitor unit set. The annular capacitor unit set comprises at least one group of annular capacitor unit pairs. The annular capacitor unit pair comprises two annular capacitor units. The strip-shaped capacitor unit set has a comb-shaped structure which is composed of more than two strip-shaped capacitor units. The monitoring device performs real-time monitoring on the positive pressure and the static friction force between the length counting wheel and the cable, thereby preventing insufficient maximal static friction force which is generated by an oversmall positive pressure, preventing a sliding friction caused by an overlarge traction force and furthermore preventing a length counting error.

Description

A kind of cable meter counter tractive force monitoring device

Technical field

The invention belongs to cable manufacturing industry technical field, relate to a kind of cable meter counter, be specifically related to a kind of cable meter counter tractive force monitoring device.

Background technology

Meter counter is one of equipment of cable manufacturing indispensability, updating and improving along with equipment and product, meter-measuring device reasonable, precisely also more and more paid close attention to by manufacturer and research unit and paid attention to.The work that relevant meter counter reduces error of meter counter aspect is the work that line cable industry manufacturer extremely pays close attention to, especially to being worth (added value) high product, power cable as large in sectional area, control cable, mine cable, crosslinked cable and telecommunication cable etc. are all the more so.It is different that cable (is namely tightening with under relaxed state) metering measured value under different tension states, therefore measurement can produce certain error (deviation) in this case.Therefore, the tension force needing cable self to keep certain as far as possible in process of production.Whether the stretching pulley of meter counter, the tension force of mechanical pinch roller and colour band meter counter guide wheel skid in the manufacturing, are also the key factors affecting meters counting accuracy.In the production and application process of reality, the coiling speed of cable drawing machine, directly have influence on the friction force size of rice counting wheel or metering crawler belt and cable, in the process of cable metering, traction engine drives cable to travel forward, two rice counting wheels pressed against cable, drive rice counting wheel to rotate, realize metering function by the stiction between rice counting wheel and cable.

If the pressure of rice counting wheel and cable is too small, can cause the maximum static friction force that provides can not the tractive force of balance traction machine, become sliding friction by original static friction between rice counting wheel and cable, cause error of meter counter.If pressure is excessive, then traction engine must provide enough large tractive force that cable could be driven to move, and increases the energy loss of traction engine.Therefore, must monitor the malleation between meter counter and cable and stiction, guarantee that tractive force is also the maximum static friction force that stiction is no more than between rice counting wheel and cable, prevent from occurring sliding friction between cable and rice counting wheel, cause error of meter counter.

Summary of the invention

In order to overcome above the deficiencies in the prior art, the invention provides a kind of cable meter counter tractive force monitoring device, by arranging 2 D force sensor on rice counting wheel, malleation between monitoring rice counting wheel and cable and tangential tractive force, prevent from occurring sliding friction between cable and rice counting wheel, cause error of meter counter.

Technical scheme of the present invention is: a kind of cable meter counter tractive force monitoring device, comprise rice counting wheel and cable drawing machine, also comprise 2 D force sensor and sensor-based system signal processor, the curved surface that 2 D force sensor is arranged on rice counting wheel gathers normal pressure between cable and rice counting wheel and stiction and sends to sensor-based system signal processor, normal pressure and stiction are fed back to cable drawing machine by sensor-based system signal processor, 2 D force sensor comprises annulus capacitor cell combination strip capacitor cell group, described strip capacitor cell group is arranged on corner outside substrate annulus capacitor cell group or the center of circle, described annulus capacitor cell group comprises at least one group of annulus capacitor cell pair, annulus capacitor cell is to comprising two mutual annulus capacitor cells, the comb teeth-shaped structure that described strip capacitor cell group is made up of plural strip capacitor cell, each annulus capacitor cell and strip capacitor cell include the drive electrode of top crown and the induction electrode of bottom crown.

The induction electrode of the annulus capacitor cell of cable meter counter tractive force monitoring device and drive electrode just to and shape is identical, the drive electrode of strip capacitor cell is identical with induction electrode width, and drive electrode length two ends are reserved left poor position δ respectively _leftwith right poor position δ _right, b _{0 drives}=b _{0 sense}+ δ _right+ δ _left, wherein b _{0 drives}for the drive electrode length of strip capacitor cell, b _{0 sense}for induction electrode length.The left poor position δ of described strip capacitor cell _leftwith right poor position δ _rightthere is δ _left=δ _right, and wherein d ₀for dielectric thickness, G is the modulus of rigidity of elastic medium, τ _maxfor maximum stress value.Drive electrode and the induction electrode of described strip capacitor cell are provided with initial offset δ in the width direction _xo.Described annulus capacitor cell group comprises n donut capacitor cell, wherein wherein, a _flatfor the length of parallel-plate, r _circlefor the width of annulus capacitor cell annulus, a _{δ circle}electrode separation between adjacent two annulus capacitor cells.The width of described strip capacitor cell wherein, d ₀for strip capacitor cell dielectric thickness, E is the Young modulus of elastic medium, and G is the modulus of rigidity of elastic medium.Described annulus capacitor cell group is connected with sensor-based system signal processor by an extension line with the drive electrode of strip capacitor cell group, the induction electrode of each annulus of described annulus capacitor cell group goes between separately and to be connected with sensor-based system signal processor, and the induction electrode of strip capacitor cell group establishes a lead-in wire.Described annulus capacitor cell, be respectively equipped with intermediate translator between capacitor cell module and sensor-based system signal processor, intermediate translator is for arranging voltage to electric capacity or frequency to the transmission coefficient of electric capacity.

The invention has the beneficial effects as follows: the present invention is on the basis of capacitance measurement two dimension power, effective usable floor area using flat board, whole annulus capacitor cell all has contribution to normal direction effect, and effectively solve two-dimentional couple of force by the method such as differential to close, thus make normal direction and tangential conversion all reach higher linear, precision and sensitivity.In addition, to the malleation between rice counting wheel and cable and stiction Real-Time Monitoring, avoid the too small maximum static friction force that provides of malleation not enough, also avoid that tractive force is excessive causes sliding friction, cause error of meter counter.

Accompanying drawing explanation

Fig. 1 is the donut skew dislocation areal analysis figure of the specific embodiment of the present invention.

Fig. 2 is that the donut dislocation of the specific embodiment of the present invention is to external diameter circle analysis chart.

Fig. 3 is the plane design drawing of the parallel plate capacitor of the specific embodiment of the present invention.

Fig. 4 is the bar shaped capacitor cell group plane design drawing of the specific embodiment of the present invention.

Fig. 5 is two groups of annulus capacitance group structural drawing of the specific embodiment of the present invention.

Fig. 6 is the differential schematic diagram of signal that the cell capacitance of the specific embodiment of the present invention is right.

Fig. 7 is the plane-parallel capacitor cross-section structure of the specific embodiment of the present invention.

Embodiment

Contrast accompanying drawing below, by the description to embodiment, the specific embodiment of the present invention is as the effect of the mutual alignment between the shape of involved each component, structure, each several part and annexation, each several part and principle of work, manufacturing process and operation using method etc., be described in further detail, have more complete, accurate and deep understanding to help those skilled in the art to inventive concept of the present invention, technical scheme.

Main thought of the present invention is: cable is in the process of metering, drawn by traction engine, cable passes in the middle of two rice counting wheels or crawler belt, and rice counting wheel applies pressure to cable, stiction between cable and rice counting wheel drives rice counting wheel to rotate, and realizes length metering.If the pressure between rice counting wheel and cable is too small, then maximum static friction force is less, easily sliding friction is there is between cable and rice counting wheel, cause error of meter counter, if pressure is excessive, can increase the stiction between cable and rice counting wheel, rice counting wheel is contrary with tractive force direction to the stiction direction of cable, affect the work efficiency of traction engine, the efficiency of whole production line also can be made to reduce.Therefore, the present invention arranges 2 D force sensor on the curved surface of rice counting wheel and cable contact, and the malleation of monitoring rice counting wheel and cable and tangential stiction, rationally arrange the malleation size of rice counting wheel and cable, and the haulage speed of cable drawing machine.At the outside surface of 2 D force sensor, one deck fexible film is set; play the effect of protection sensor; 2 D force sensor connects sensor-based system signal processor; sensor-based system signal processor carries out analyzing and processing to data; provide the tangential force between rice counting wheel and cable and normal force, 2 D force sensor of the present invention is the capacitance pressure transducer, of circular ring type.The stiction that cable drawing machine feeds back according to sensor-based system signal processor and normal pressure numerical value, regulate tractive force.

The capacitance pressure transducer, of circular ring type comprises annulus capacitor cell group and strip capacitor cell group, annulus capacitor cell group is for surveying the size of tangential force and normal force, strip capacitor cell group is for measuring the direction of tangential force, strip capacitor cell group is arranged on the home position of annulus, annulus capacitor cell group comprises annulus capacitor cell pair more than two, annulus capacitor cell is to comprising two mutual annulus capacitor cells, the comb teeth-shaped structure that strip capacitor cell group is made up of plural strip electric capacity, each annular capacitor unit or strip capacitor cell include the drive electrode of top crown and the induction electrode of bottom crown.The induction electrode of each annulus capacitor cell and drive electrode just to and shape is identical, the drive electrode of each strip capacitor cell is identical with induction electrode width, the length of the drive electrode of strip electric capacity is greater than induction electrode length, the drive electrode length two ends reserved left poor position δ respectively of strip electric capacity _leftwith right poor position δ _right, b _{0 drives}=b _{0 sense}+ δ _right+ δ _left, wherein b _{0 drives}for the drive electrode length of strip capacitor cell, b _{0 sense}for the induction electrode length of strip capacitor cell.The poor position δ of strip electric capacity _left=δ _right, and wherein d ₀for dielectric thickness, G is the modulus of rigidity of elastic medium, τ _ymaxfor maximum stress value.In the present invention there is an initial offset in the drive electrode of strip electric capacity and induction electrode in the width direction.

The width of strip electric capacity wherein, d ₀for dielectric thickness, E is the Young modulus of elastic medium, and G is the modulus of rigidity of elastic medium.Annulus capacitor cell group is connected with sensor-based system signal processor by an extension line with the drive electrode of strip capacitor cell group, each annulus of annulus capacitor cell group goes between separately and to be connected with sensor-based system signal processor, and each induction electrode of strip capacitor cell can be connected with sensor-based system signal processor by a lead-in wire.Be provided with intermediate translator between sensor-based system signal processor and capacitor cell, transducer is for arranging voltage to electric capacity or frequency to the transmission coefficient of electric capacity.

Below in conjunction with accompanying drawing 1-7 to derivation of the present invention and principle, to effect and principle of work, the operation using method etc. of the mutual alignment between each several part shape, structure, each several part and annexation, each several part, be described in further detail.

1.1 capacitance equation and input-output characteristic thereof

The initial capacitance of plane-parallel capacitor is:

$C_0=\frac{{\mathrm{\ϵ}}_0\·{\mathrm{\ϵ}}_r\·A_0}{d_0}---\left(1\right)$

In formula, ε ₀vacuum medium electric constant is 8.85PF/m, ε _r=2.5 is dielectric relative dielectric constant.D ₀by σ _nexcitation produce relative deformation ε _n=δ _n/ d ₀=σ _n/ E, (1) formula of substitution obtains input-output characteristic

$C_n={\mathrm{\ϵ}}_0\·{\mathrm{\ϵ}}_r\frac{A_0}{d_0(1-{\mathrm{\ϵ}}_n)}={\mathrm{\ϵ}}_0\·{\mathrm{\ϵ}}_r\frac{A_0}{d_0(1-\frac{F_n}{AE})}---\left(2\right)$

The linearity under 1.2 normal stress effects and sensitivity

1.2.1 the normal direction linearity

(2) F in formula _nin the denominator, therefore C _n=f (F _n) relation be nonlinear.Because of the maximal value σ in conversion range _nmaxcompared with dielectric resilient constant E, ε _na very little amount, i.e. ε in denominator _n<<1, omits the higher-order shear deformation of more than quadratic power by (2) formula by series expansion, can be reduced to:

$C_n=C_0(1+\mathrm{\&epsiv;})=C_0(1+\frac{F_n}{A\&CenterDot;E})---\left(3\right)$

Visible at C _nwith F _nconversion characteristic in the maximum relative error of the normal direction linearity close to zero.

1.2.2 sensitivity

By the definition of normal direction sensitivity

By (2) formula then

$S_{n2}=\frac{{\mathrm{dC}}_n}{{\mathrm{dF}}_n}=C_0\&CenterDot;\frac{1}{1-2\mathrm{\&epsiv;}}=C_0\&CenterDot;\frac{1}{1-2\frac{F_n}{A\&CenterDot;E}}---\left(4\right)$

Can linear sensitivity be obtained by (3) formula,

$S_{n1}=C_0/AE={\mathrm{\&epsiv;}}_0{\mathrm{\&epsiv;}}_r/d_{0}E---\left(5\right)$

S _n2with F _nand become, F _nlarger, S _n2larger, in mild nonlinear in whole conversion characteristic.

Relation between 1.3 tangential displacements and annulus capacitor useful area

For donut electric capacity to analyzing, as shown in Figure 1, R ₁for exradius, R ₂for inner circle radius, r=annular width=large exradius R ₁-inner circle radius R ₂.To the power F on drive electrode tangent plane _x, cause drive electrode corresponding up and down and induction electrode to produce one and shear dislocation, if d _xfor tangent plane displacement, dislocation area is S _inand S _outward, the initial right opposite of battery lead plate is long-pending should be π (R ₁ ²-R ₂ ²).Fig. 2 is that outer donut electric capacity justifies analysis chart to external diameter, and before and after mobile, two distance of center circle are from being d _x, before and after mobile, the intersection point of two centers of circle and two circles forms a rhombus, can calculate S _outwardarea: d _x

In above formula, there is d _x<<R ₁, so get

By

Will taylor series expansion, and omit high-order term,

In like manner, can know, S _in=2R ₂d _x, so the wrong area of donut electric capacity is S=2R ₁d _x+ 2R ₂d _x.

The capacitance variations of the annulus capacitor under 1.4 tangential stress τ excitations

Tangential stress τ does not change the physical dimension parameter A of pole plate ₀, to dielectric thickness d ₀also do not have an impact.But τ _xand τ _ychange the space structure of plane-parallel capacitor, between the upper bottom crown faced by forward, there occurs dislocation skew.The dislocation offset d of pole plate under τ effect _x.

When τ is zero, upper bottom crown is just right, free area between pole plate in fig. 2, at τ _xunder the effect of dextrad, top crown creates dislocation offset d to the right relative to bottom crown _x, thus make the useful area between bottom crown when calculating electric capacity consequent electric capacity is:

$C_{\mathrm{\&tau;}x}=\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;({\mathrm{\&pi;R}}_1^2-{\mathrm{\&pi;R}}_2^2-2R_1{d}_x-2R_2{d}_x)}{d_0}---\left(6\right)$

According to shearing Hooke's law

${\mathrm{\&tau;}}_x={\mathrm{\&gamma;}}_x\&CenterDot;G=G\&CenterDot;{\mathrm{\&delta;}}_x/d_0---\left(7\right)$

(7) are substituted into (6) can obtain

$C_{\mathrm{\&tau;}x}=C_0-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;2(R_1+R_2)d_x}{d_0}=C_0-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;2(R_1+R_2)F_x}{A_{\mathrm{\&tau;}}G}=C_0-\frac{2{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r{F}_x}{G\mathrm{\&pi;}(R_1-R_2)}---\left(8\right)$

(8) formula is the input-output characteristics under shearing stress, C _τwith τ _xlinear, its sensitivity

$S_{\mathrm{\&tau;}x}=\frac{{\mathrm{dC}}_{\mathrm{\&tau;}}}{{\mathrm{dF}}_x}=\frac{2{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r}{G\mathrm{\&pi;}(R_1-R_2)}---\left(10\right)$

Tangential sensitivity and R can be found out by formula (10) ₁-R ₂relevant, namely the width of tangential sensitivity and annulus is inversely proportional to, and width more sluggishness is higher.

The design of 2 plate condensers

The design of 2.1 plate condensers

See the electrode plane arrangenent diagram of the annulus capacitor cell group in Fig. 3, at a 10 × 10mm ²substrate on a kind of contact parallel-plate three-dimensional force pressure transducer, sensor comprises sensor-based system signal processor, the annulus capacitor cell group be connected respectively with sensor-based system signal processor and strip capacitor cell group, annulus capacitor cell group is for surveying the size of tangential force and normal force, strip capacitor cell group is for measuring the direction of tangential force, strip capacitor cell group is arranged on the center of substrate annulus capacitor cell group or four corners of parallel-plate, effectively can use the area of parallel-plate like this, annulus capacitor cell group is paved with whole parallel-plate, when measuring three-dimensional force, all work, and strip capacitor cell group effectively make use of annulus capacitor cell group lay after, the space at parallel-plate corner or center, for measuring the direction of three-dimensional force tangential force.The drive electrode of annulus capacitor cell group and induction electrode are all made up of n donut, and n is even number, then form n/2 annulus capacitor cell pair.Hachure part represents the outer mode cross section of wax-loss casting process, and its geometric configuration and size also should keep accurate when mechanical-moulded.

The electrode plate structure figure of Fig. 4 strip capacitor cell group, the comb teeth-shaped structure that strip capacitor cell group is made up of multiple strip capacitor cell, each strip capacitor cell comprises the drive electrode of top crown and the induction electrode of bottom crown, and pole plate is set up at planimetric position cloth certain skew δ in the width direction _xo.If every root strip capacitor cell is wide is a ₀, the groove width between two strip capacitor cells is a _δ, then the pitch of every root strip capacitor cell is a ₀+ a _δ.The width of strip electric capacity wherein, d ₀for dielectric thickness, E is the Young modulus of elastic medium, and G is the modulus of rigidity of elastic medium.

2.2 pumping signals and coordinate system

The plane-parallel capacitor of circular ring type is placed in rectangular coordinate system, three-dimensional simulation puts on the outside surface of capacitor plate, the contact acting force produced has Fx, Fy and Fz tri-durection components, and the action direction of Fx and Fy is along X-axis and Y-axis, and the action direction of Fz along OZ axle namely direction, normal direction and tangential stress are a kind of stress tensor, from can the response of output capacitance between the lead-in wire of electrode; Normal stress σ _n=Fn/A, wherein for pole plate normal direction stress surface, Fn=Fz is normal component; Both side surface produces paired tangential stress τ _cut=F _cut/ A.

According to the Hooke's law in Elasticity, σ _nand τ _x, τ _yelastic body all will be made to produce corresponding distortion.Wherein,

${\mathrm{\&sigma;}}_n=E\&CenterDot;{\mathrm{\&epsiv;}}_n=E\&CenterDot;{\mathrm{\&delta;}}_n/d_0=\frac{F_n}{A}$

In formula, E is the Young modulus GN/m of elastic medium ², G is the modulus of rigidity GN/m of elastic medium ², δ n is the Normal Displacement (unit: μm) of elastic medium, and δ x and δ y is the relative dislocation (unit: μm) of the upper and lower two-plate of capacitor, and its sign is pointed to by coordinate axis and determined.

The calculating of 2.3 normal force and tangential force size

Choosing the n-th electric capacity and the n-th/2 electric capacity, by setting up annulus capacitor cell, composition system of equations being calculated, as shown in Figure 5.If after battery lead plate is subject to normal direction and tangential incentive action, if the output capacitance of the n-th annulus capacitor cell is C ₁, n/2 annulus capacitor cell output capacitance is C ₂, tangential displacement is d _x, the capacitance pole distance of normal direction is d _n, S ₁₀the right opposite initial for outer shroud amasss, S ₂₀the right opposite initial for inner ring amasss, and S1 is the dislocation area of outer toroid, the dislocation area of annulus in S2.

$C_1=\frac{\mathrm{\&epsiv;}(S_{10}-S1)}{d_n}=\frac{\mathrm{\&epsiv;}({\mathrm{\&pi;R}}_1^2-{\mathrm{\&pi;R}}_2^2)}{d_n}-\frac{\mathrm{\&epsiv;}(2R_1{d}_x+2R_2{d}_x)}{d_n}$ ①

$C_2=\frac{\mathrm{\&epsiv;}(S_{20}-S2)}{d_n}=\frac{\mathrm{\&epsiv;}({\mathrm{\&pi;r}}_1^2-{\mathrm{\&pi;r}}_2^2)}{d_n}-\frac{\mathrm{\&epsiv;}(2r_1{d}_x+2r_2{d}_x)}{d_n}$ ②

Will obtain:

$C_1-C_2*\frac{R_1+R_2}{r_1+r_2}=\frac{\mathrm{\&epsiv;}\mathrm{\&pi;}(R_1^2-R_2^2)}{d_n}-\frac{R_1+R_2}{r_1+r_2}*\frac{\mathrm{\&epsiv;}\mathrm{\&pi;}(r_1^2-r_2^2)}{d_n}$

If in above formula $\frac{R_1+R_2}{r_1+r_2}=K,$ Then $d_n=\frac{\mathrm{\&epsiv;}(S_{10}-{\mathrm{KS}}_{20})}{C_1-{\mathrm{KC}}_2}$

According to $d_n=d_0-\mathrm{\&Delta;}d=d_0(1-\frac{F_n}{E\&CenterDot;S_0})$

Known: $F_n=\frac{(d_n-d_0)E\&CenterDot;S_0}{d_0}$

Above-mentioned is incited somebody to action 1. * C ₂-2. * C ₁obtain:

$d_x=\frac{C_2{S}_{10}-C_1{S}_{20}}{2C_2(R_1+R_2)-2C_1(r_1+r_2)};$

By $\mathrm{\&gamma;}=\frac{\mathrm{\&tau;}}{G}=\frac{F_{\mathrm{\&tau;}}}{G\&CenterDot;S_0}=\frac{d_x}{d_0}=\frac{C_2{S}_{10}-C_1{S}_{20}}{d_{0}2C_2(R_1+R_2)-d_{0}2C_1(r_1+r_2)},$ So F _τfor

$F_{\mathrm{\&tau;}}=\frac{(C_2{S}_{10}-C_1{S}_{20})\&CenterDot;G\&CenterDot;S_0}{d_{0}2C_2(R_1+R_2)-d_{0}2C_1(r_1+r_2)}$

The direction determining of 2.4 tangential forces

2.4.1 strip capacitor cell group shape structure and parameter design

In order to solve the direction of tangential force, in the present invention because tangential force is only along the positive negative direction of X-axis, devise strip capacitor cell group as shown in Figure 4, the comb teeth-shaped structure that strip capacitor cell group is made up of multiple strip capacitor cell, each strip capacitor cell comprises the drive electrode of top crown and the induction electrode of bottom crown, and pole plate is set up at planimetric position cloth certain skew δ in the width direction _xo.If every root strip capacitor cell is wide is a ₀, the groove width between two strip capacitor cells is a _δ, then the pitch of every root strip capacitor cell is a ₀+ a _δ.In order to avoid δ is reserved at the small sample perturbations drive electrode length two ends of Y-direction ₀, therefore b _{0 drives}=b _{0 end}+ 2 δ ₀, wherein at b _{0 drives}two ends length is reserved should be ensured in theory ${\mathrm{\&delta;}}_0\&GreaterEqual;d_0\&CenterDot;\frac{{\mathrm{\&tau;}}_{y\max }}{G},$ Its calculated value is ${10}^{-5}\&times;\frac{70\&times;{10}^3}{2.4\&times;{10}^6}=2.9\&times;{10}^{-8}m={10}^{-2}um<<1um,$ Therefore should b be ensured in technique _{0 drives}-b _{0 end}>=0.01mm.Initial offset δ _xo, its value should ensure its calculated value and δ ₀similar, its initial offset all arranges δ _xo=0.01mm, to ensure that increase and decrease effect appears in the electric capacity response of tangential excitation to strip capacitor cell group, just can judge the direction of tangential excitation according to increase and decrease effect.

Shown in Fig. 4, work as τ _xwhen=0, initial capacitance when shearing stress is 0 is on this basis, as applied a tangential and normal direction excitation in strip capacitor cell group, generation ± δ _xdislocation skew, then strip capacitor cell group export be:

$C_{\mathrm{\&tau;}n}=\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;b_0\&CenterDot;(a_0-{\mathrm{\&delta;}}_{x0}+{\mathrm{\&delta;}}_x)}{d_n}---\left(13\right)$

Wherein d _nfor the polar plate spacing by strip capacitor cell group after normal direction excitation, after being subject to tangential and normal direction incentive action, the electrode separation of strip capacitor cell combination annulus capacitor cell group is identical, therefore, can be solved by annulus capacitor cell group ask and calculate δ _x, δ here _xfor vector, therefore, if δ _x>0, then illustrating that the right opposite of upper bottom crown is long-pending increases, and is offset to the right in the diagram, if δ _x<0, then illustrating that the right opposite of upper bottom crown is long-pending and reduce, is offset left in the diagram.Determine wind direction direction in the horizontal direction, by the tangential force of annulus capacitor cell group and the ratio of normal force that solve and wind direction can be judged.

2.5 main material selection and characterisitic parameter thereof

The section of structure of plane-parallel capacitor is similar to sandwich structure as shown in Figure 6.As shown in Figure 6,1 and 2 is upper and lower PCB substrate, and 5 is the drive electrode Copper Foil of sticker in PCB substrate, the induction electrode Copper Foil on 6 underlying substrate.Pole plate is apart from d ₀=0.1mm, upper and lower base plate inner space, except copper foil electrode, is PDMS (dimethyl silicone polymer) the superlastic insulating medium with lost wax process filling.Its machinery and physical characteristics parameter are Young modulus E=6.2MPa, and its shear modulus is G=4.1MPa, relative DIELECTRIC CONSTANT ε during dielectric polorization _γ=2.5.Because E and G of medium is much smaller than the elastic modulus E of copper _copper=103GPa, therefore the distortion of capacitor internal medium under stress state is much larger than the distortion of pole plate.

2.6 contact conductor designs

Be that drive electrode or induction electrode all need to have extension line, consider that each drive electrode is all ground connection in signal level, therefore drive electrode only need share same extension line.Annulus capacitor cell group is connected with sensor-based system signal processor by an extension line with the drive electrode of strip capacitor cell group, each annulus of described annulus capacitor cell group goes between separately and to be connected with sensor-based system signal processor, sensor-based system signal processor calculates according to the output valve independent assortment of each annulus, carry out being averaging the size and normal force size that draw tangential force afterwards, when accuracy requirement is not high, annulus capacitor cell group can only select two optimum annulus to draw 2 lead-in wires, obtains d by these two annulus _xand d _n, thus draw size and the normal force size of tangential force; The induction electrode of strip capacitor cell group can share a lead-in wire, is connected, for calculating the direction of tangential force with sensor-based system signal processor.Be provided with intermediate translator between described sensor-based system signal processor and capacitor cell, as Fig. 7, intermediate translator is for arranging voltage to electric capacity or frequency to the transmission coefficient of electric capacity.Whole capacitance component has at least 4 pins and draws from the side of planar package, so that whole assembly top and bottom outside surface can contact with measuring object easily.

Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.The protection domain that protection scope of the present invention should limit with claims is as the criterion.

Claims (8)

1. a cable meter counter tractive force monitoring device, comprise rice counting wheel and cable drawing machine, it is characterized in that, also comprise 2 D force sensor and sensor-based system signal processor, the curved surface that 2 D force sensor is arranged on rice counting wheel gathers normal pressure between cable and rice counting wheel and stiction and sends to sensor-based system signal processor, normal pressure and stiction are fed back to cable drawing machine by sensor-based system signal processor, 2 D force sensor comprises annulus capacitor cell combination strip capacitor cell group, described strip capacitor cell group is arranged on corner outside substrate annulus capacitor cell group or the center of circle, described annulus capacitor cell group comprises at least one group of annulus capacitor cell pair, annulus capacitor cell is to comprising two mutual annulus capacitor cells, the comb teeth-shaped structure that described strip capacitor cell group is made up of plural strip capacitor cell, each annulus capacitor cell and strip capacitor cell include the drive electrode of top crown and the induction electrode of bottom crown.

2. cable meter counter tractive force monitoring device according to claim 1, it is characterized in that, the induction electrode of described annulus capacitor cell and drive electrode just to and shape is identical, the drive electrode of strip capacitor cell is identical with induction electrode width, and drive electrode length two ends are reserved left poor position δ respectively _leftwith right poor position δ _right, b _{0 drives}=b _{0 sense}+ δ _right+ δ _left, wherein b _{0 drives}for the drive electrode length of strip capacitor cell, b _{0 sense}for induction electrode length.

3. cable meter counter tractive force monitoring device according to claim 2, is characterized in that, the left poor position δ of described strip capacitor cell _leftwith right poor position δ _rightthere is δ _left=δ _right, and wherein d ₀for dielectric thickness, G is the modulus of rigidity of elastic medium, τ _maxfor maximum stress value.

4. cable meter counter tractive force monitoring device according to claim 2, is characterized in that, drive electrode and the induction electrode of described strip capacitor cell are provided with initial offset δ in the width direction _xo.

5. cable meter counter tractive force monitoring device according to claim 1, is characterized in that, described annulus capacitor cell group comprises n donut capacitor cell, wherein wherein, a _flatfor the length of parallel-plate, r _circlefor the width of annulus capacitor cell annulus, a _{δ circle}electrode separation between adjacent two annulus capacitor cells.

6. cable meter counter tractive force monitoring device according to claim 2, is characterized in that, the width of described strip capacitor cell wherein, d ₀for strip capacitor cell dielectric thickness, E is the Young modulus of elastic medium, and G is the modulus of rigidity of elastic medium.

7. cable meter counter tractive force monitoring device according to claim 1, it is characterized in that, described annulus capacitor cell group is connected with sensor-based system signal processor by an extension line with the drive electrode of strip capacitor cell group, the induction electrode of each annulus of described annulus capacitor cell group goes between separately and to be connected with sensor-based system signal processor, and the induction electrode of strip capacitor cell group establishes a lead-in wire.

8. cable meter counter tractive force monitoring device according to claim 2, it is characterized in that, described annulus capacitor cell, be respectively equipped with intermediate translator between capacitor cell module and sensor-based system signal processor, intermediate translator is for arranging voltage to electric capacity or frequency to the transmission coefficient of electric capacity.