CN103604359A - Relative-position detection method of band-like material - Google Patents

Abstract

The invention provides a relative-position detection method of a band-like material. The relative-position detection method is used for detecting the relative position and the width of the band-like material on a production line. According to the relative-position detection method, four electrode plates having the same size and shape are taken, every two electrode plates constitute a capacitor, the two capacitors are distributed on the left side and the right side of the production line of the tested band-like material, and the tested band-like material passes through the space between the upper two electrode plates and the lower two electrode plates of the two capacitors; the capacitance variable quantity of the capacitors is measured under the situations that the tested band-like material is not inserted and the tested band-like material is inserted, the lengths of the parts, inserted in the capacitors, of the tested band-like material are determined according to the tested band-like material, the width of the tested band-like material is determined according to geometrical distances, and deviation of the tested band-like material is determined according to the geometrical distances. The relative-position detection method is free of limitation of tested materials and environmental disturbance; when the widths of the tested materials are known and the capacitor on one side breaks down, single-side operation can be conducted.

Description

A kind of relative position detection method of strip material

Technical field

The invention belongs to the relative position for strip material, the field of measuring technique of width, specifically by adopting the measuring method of electric capacity, realize relative position and width detection.

Background technology

In web material production, finished-product material need be coiled into volume, or will after strip material uncoiling, process.In uncoiling or the process of batching, need material center position to be remained on the center or certain specific reference line of production line.Strip material relates to of a great variety, such as plastic sheeting, paper, iron and steel, aluminium, copper etc.Can be divided into metal or nonmetal, magnetic material or nonmagnetic substance.Several detection methods such as available technology adopting inductance type, photo-electric realize location.Wherein inductance type detection method can only detect magnetic material, and photo-electric detection method can only detect the material that transparency is not high, and is subject to the interference ratio of other pollutions such as surround lighting, dust more serious.

Summary of the invention

The relative position detection method that the object of this invention is to provide a kind of strip material, adopts condenser type detection technique, to detect in real time real-time relative position and the width of strip material on production line.The present invention can avoid the restriction of material completely and environmental requirement is reduced greatly, can accomplish non-maintaining use.

The relative position detection method of a kind of strip material of the present invention, specifically:

Step 1: get all identical battery lead plates of four size and shapes, two battery lead plates form an electric capacity, by two capacity arrangement that form, in the left and right sides of the production line of tested strip material, tested strip material is passed between two battery lead plates up and down from two electric capacity;

Step 2: for left side or right side electric capacity, initial capacitance value when detecting tested strip material and not inserting electric capacity, then in tested strip material, insert after electric capacity, real-time Detection capacitance value, the capacitance detecting is in real time deducted to initial capacitance value and obtain capacitance change, according to the character of tested strip material, determine the distance of tested strip material insertion left side or right side electric capacity;

Step 3: tested strip material is inserted to the distance of left side electric capacity, added the vertical range of center line of the battery lead plate Edge Distance production line of upper left side electric capacity, obtain the center line of production line to the vertical range L of tested strip material left hand edge _l; Tested strip material is inserted to the distance of right side electric capacity, added the vertical range of center line of the battery lead plate Edge Distance production line of right side electric capacity, obtain the center line of production line to the vertical range L of tested strip material right hand edge _r;

Step 4: the distance L that synchronization is recorded _land L _rbe added, obtain the width of tested strip material;

Step 5: record in real time the center line of production line by left side or right side electric capacity to the vertical range of tested band left hand edge or right hand edge, with the width comparison of tested strip material, obtain the distance that tested strip material departs from production line center line.

In described step 2, determine the distance of tested strip material insertion electric capacity according to the character of tested strip material, establishing L is the distance that tested strip material is inserted left side or right side electric capacity, and Δ C is the capacitance change of left side or right side electric capacity;

(1), when tested strip material is non-conductive material, distance L is: wherein, ε _r2for tested strip material specific inductive capacity, C ₀for the initial capacitance value of left side or right side electric capacity, L ₀length for battery lead plate;

(2), when tested strip material is conductor material, distance L is:

wherein, d ₀for the vertical range between two battery lead plates up and down of left side or right side electric capacity, d ₁thickness for tested strip material.

Advantage of the present invention and good effect are: (1) is not subject to the restriction of measured material; (2) be not subject to environmental interference; (3) relative position of material can not only be measured, and the width of measured material can be calculated simultaneously; (4) when the width of measured material is known, when a lateral capacitance fault wherein, can monolateral electric capacity work, detection architecture is simple, effectively.

Accompanying drawing explanation

Fig. 1 be strip material of the present invention relative position detection method realize schematic diagram.

Embodiment

Below in conjunction with drawings and Examples, the present invention is described in further detail.

Below in conjunction with Fig. 1, the relative position detection method of strip material of the present invention is described.

Step 1: arrange detection architecture.

Testing agency comprises all identical parallel electrode plates of four block sizes and shape, as shown in Figure 1.Battery lead plate 1 and battery lead plate 2 form a capacitor C 1, and battery lead plate 3 and battery lead plate 4 form a capacitor C 2.Capacitor C 1 and C2 are arranged in to the left and right sides of tested web material production line.In the embodiment of the present invention, preferably two electric capacity are symmetrical about the vertical plane at the center line place of tested web material production line.Tested strip material is passed between two battery lead plates up and down from two electric capacity.The center of the testing agency of two electric capacity compositions is the center line of tested web material production line namely.

As shown in Figure 1, the length of each battery lead plate is L ₀, width is b ₀, the vertical range between upper and lower two battery lead plates of electric capacity is d ₀, the vertical range of center line of Edge Distance production line that is positioned at two battery lead plates of the same side is L _a.Be located at and arrange after capacitor C 1 and C2, the distance that tested strip material enters respectively each electric capacity is L, now, there are two regions in each electric capacity, one is upper and lower two regions that battery lead plate has tested strip material to block, and one is upper and lower two regions that battery lead plate is not blocked by tested strip material.

The center of the tested strip material of General Requirements remains on the center of production line, and now, the distance L that tested strip material is inserted two electric capacity in left and right is identical.When the center of tested strip material is offset the center of production line, the distance that tested strip material is inserted two electric capacity in left and right is different.

Step 2: for each electric capacity, the initial capacitance value of electric capacity when detecting tested strip material and not inserting electric capacity, then in tested strip material, insert after electric capacity, real-time Detection capacitance value, to obtain capacitance change, according to the character of tested strip material, determine the distance L of tested strip material insertion electric capacity.

When tested strip material is non-conductive material:

With left side capacitor C 1, measure to calculate measuring principle is described.When tested strip material is inserted between electric capacity, the capacitance C between the two-plate of the left side ₁for:

$C_1=C_{11}+C_{12}={\mathrm{\ϵ}}_0{b}_0\frac{{\mathrm{\ϵ}}_{r1}(L_0-L)+{\mathrm{\ϵ}}_{r2}L}{d_0}---\left(1\right)$

Wherein, C ₁₁the electric capacity that represents the region that two battery lead plates up and down of capacitor C 1 are not blocked by tested strip material, C ₁₂two battery lead plates up and down that represent capacitor C 1 have the electric capacity in the region that tested strip material blocks.ε ₀represent vacuum absolute dielectric constant, ε _r1represent air relative dielectric constant=1.00053, ε _r2represent tested strip material specific inductive capacity.

For non-conductive material, can establish ε ₀ε _r1≈ ε ₀, when L=0, initial capacitance C between pole plate ₁₀for:

$C_{10}=\frac{{\mathrm{\ϵ}}_0{\mathrm{\ϵ}}_{r1}{L}_0{b}_0}{d_0}=\frac{{\mathrm{\ϵ}}_0{L}_0{b}_0}{d_0}=\frac{{\mathrm{\ϵ}}_0{L}_0{b}_0}{d_0}---\left(2\right)$

When tested strip material enters between pole plate after the L degree of depth, cause that capacitance change Δ C meets following formula relation:

$\frac{\mathrm{\ΔC}}{C_{10}}=\frac{C_1-C_{10}}{C_{10}}=\frac{({\mathrm{\ϵ}}_{r2}-1)L}{L_0}---\left(3\right)$

C ₁it is the capacitance recording in real time.

Obtaining tested strip material, to enter the relation of width L between pole plate and capacitance change Δ C as follows:

$L=\frac{\mathrm{\ΔC}\×L_0}{C_{10}({\mathrm{\ϵ}}_{r2}-1)}---\left(4\right)$

When tested strip material is conductor material:

With left side capacitor C 1, measure to calculate measuring principle is described.When tested strip material is inserted between electric capacity, the capacitance C between the two-plate of the left side ₁for:

$C_1=C_{11}+C_{12}=\frac{{\mathrm{\ϵ}}_0{\mathrm{\ϵ}}_{r1}(L_0-L)b_0}{d_0}+\frac{{\mathrm{\ϵ}}_0{\mathrm{\ϵ}}_{r1}L{b}_0}{d_0-d_1}---\left(5\right)$

Wherein, d ₁the thickness that represents tested strip material.

When L=0, initial capacitance C between pole plate ₁₀for:

$C_{10}=\frac{{\mathrm{\ϵ}}_0{\mathrm{\ϵ}}_{r1}{L}_0{b}_0}{d_0}---\left(6\right)$

When measured material enters between pole plate after the L degree of depth, cause that capacitance change Δ C meets following formula relation:

$\frac{\mathrm{\ΔC}}{C_{10}}=\frac{C_1-C_{10}}{C_{10}}=\frac{{\mathrm{Ld}}_1}{(d_0-d_1)L_0}---\left(7\right)$

Obtaining tested strip material, to enter the relation of width L between pole plate and capacitance change Δ C as follows:

$L=\frac{\mathrm{\ΔC}\×L_0(d_0-d_1)}{C_{10}{d}_1}---\left(8\right)$

This shows, capacitance change Δ C and dielectric amount of movement L are linear, and namely capacitance change is directly proportional to the distance that tested strip material enters between capacitor plate.

Equally, for right side electric capacity, according to method above, can cross and obtain the distance that tested strip material enters right side electric capacity.

Step 3: the distance of inserting left and right sides electric capacity according to tested strip material, and the vertical range of the center line of battery lead plate Edge Distance production line, obtain the center line of production line to the vertical range of tested strip material left and right edges, thereby obtain the width of tested strip material.

During actual use, according to the character of measured material, select corresponding computing formula, the actual capacitance of measuring just can be calculated to obtain L value by above-mentioned formula (4) or formula (8).For left side electric capacity, L value is added L _a, can obtain measuring mechanism center to the distance L of tested strip material left hand edge _l.Equally, the distance that tested strip material step 2 being recorded is inserted right side electric capacity adds L _a, can obtain measuring mechanism center to the distance L of tested strip material right hand edge _r.

Step 4: by the distance L recording in the same time mutually _land L _rbe added distance L _lwith distance L _rand be exactly the width D of tested strip material.

Step 5: record in real time the center line of production line by left side or right side electric capacity to the vertical range of tested band left hand edge or right hand edge, with the width comparison of tested strip material, obtain the distance that tested strip material departs from production line center line.

Claims (3)

1. a relative position detection method for strip material, is characterized in that, comprises the steps:

Step 1: get all identical battery lead plates of four size and shapes, two battery lead plates form an electric capacity, by two capacity arrangement that form, in the left and right sides of the production line of tested strip material, tested strip material is passed between two battery lead plates up and down from two electric capacity;

Step 2: for left side or right side electric capacity, initial capacitance value when detecting tested strip material and not inserting electric capacity, then in tested strip material, insert after electric capacity, real-time Detection capacitance value, the capacitance detecting is in real time deducted to initial capacitance value and obtain capacitance change, according to the character of tested strip material, determine the distance of tested strip material insertion left side or right side electric capacity;

Step 3: tested strip material is inserted to the distance of left side electric capacity, added the vertical range of center line of the battery lead plate Edge Distance production line of upper left side electric capacity, obtain the center line of production line to the vertical range L of tested strip material left hand edge _l; Tested strip material is inserted to the distance of right side electric capacity, added the vertical range of center line of the battery lead plate Edge Distance production line of right side electric capacity, obtain the center line of production line to the vertical range L of tested strip material right hand edge _r;

Step 4: the distance L that synchronization is recorded _land L _rbe added, obtain the width of tested strip material;

Step 5: record in real time the center line of production line by left side or right side electric capacity to the vertical range of tested strip material left hand edge or right hand edge, with the width comparison of tested strip material, obtain the distance that tested strip material departs from production line center line.

2. the relative position detection method of a kind of strip material according to claim 1, is characterized in that, in described step 1, two electric capacity arranging are symmetrical about the vertical plane at the center line place of tested web material production line.

3. the relative position detection method of a kind of strip material according to claim 1 and 2, it is characterized in that, described step 2, the method of determining the distance of tested strip material insertion electric capacity is: establishing L is the distance that tested strip material is inserted left side or right side electric capacity, Δ C is the capacitance change of left side or right side electric capacity, C ₀for the initial capacitance value of left side or right side electric capacity, L ₀for the length of battery lead plate, d ₀the vertical range between two battery lead plates up and down for left side or right side electric capacity;

When tested strip material is non-conductive material, distance L is:

wherein, ε _r2for tested strip material specific inductive capacity;

When tested strip material is conductor material, distance L is:

wherein, d ₁thickness for tested strip material.

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