JPS6035603B2 - Method for detecting contact state of two members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION - The present invention relates to a method for detecting whether or not the contact surfaces of two members that are in contact with each other are in a proper contact state.

For example, in joining machines, connecting pipes, etc., if there is uneven contact between the contact surfaces that come into contact with each other, abnormal vibrations and liquid leakage will occur, which is inconvenient.

However, if the contact state of the contact surface can be easily detected, it becomes possible to easily perform proper machine axis alignment, pipe connection, etc. The present invention aims to provide a method for simply and easily detecting the contact state between such contact surfaces. The second wave whose conductance changes due to the action of
Using a detector composed of a pressure-sensitive plate in one layer and a sheet resistor in a third layer with high conductivity, the periphery of the detector is divided into two pairs of opposing sides, and Applying voltages +a and -a to the electrodes provided on a pair of opposite sides of the sheet resistor and the electrodes provided on another pair of opposite sides of the third layer sheet resistor through resistors, respectively. , based on the voltage of each pair of electrodes of the first and second sheet resistors when the detector is sandwiched between the contact surfaces of the two members that are to be in close contact with each other, the contact between the two members is determined. It is characterized by detecting the state.

Hereinafter, the method of the present invention will be explained in more detail with reference to the drawings.

In FIG. 1, a detector 1 used to detect a contact state between two members according to the present invention includes a first layer of a sheet resistor 2 made of a highly conductive flexible material, and an external pressure applied to the detector 1. A second layer made of pressure-sensitive conductive rubber or the like whose conductance changes with
It has a three-layer structure consisting of a pressure-sensitive plate 3 in one layer and a sheet resistor 4 in a third layer made of the same material as the sheet resistor 2 in the first layer. It has a square planar shape, and the first layer sheet resistor 2 is provided with electrodes 5 and 6 on a pair of opposite sides in the x direction, and the third layer sheet resistor 4 is provided with a pair of electrodes on opposite sides in the y direction. Electrodes 7.8 are provided on the opposite side.

In the detector 1 having such a configuration, a voltage of 10a is applied to the electrodes 5 and 6 at both ends of the sheet resistor 2 in the first layer through the resistors R, and the sheet resistor 2 in the third layer The electrodes 7 and 8 at both ends of the detector 4 were connected to each other through a resistor R so as to apply a voltage -a, and the detector 1 was sandwiched between the two members 9 and 10 to apply a clamping force to the detector 1. The voltages V^ and V8 of the electrodes 5 and 6 and the voltages Vc and Vo of the electrodes 7 and 8 are taken out at that time. Figure 2 shows the coordinates (x, y) of the center position of the surface pressure acting on the detector 1 based on the voltage of each electrode.
The circuit configuration for determining x among these is shown, and the voltages V^ and V8 of the electrodes 5 and 6 are input to the subtraction circuits 11, 12, and 13, and the voltage 0a applied to the electrodes 5 and 6 via the resistor R is Subtraction circuit 1 based on the input to subtraction circuits 11 and 13
The outputs a-V^, a-V8 from 1 and 13 are added to the adder circuit 14.
Further, the output from the addition circuit 14 and the output from the subtraction circuit 12 are input to the division circuit 15, and the coordinate value x of the center position (x, y) of the surface pressure is calculated as X=k. Koden≧raB
... m (where k is a constant) is configured to be calculated.

Also, regarding other coordinate values y at the center position (x, y), y=k2
2￥Terayumi Shin et al.

--- [21 (however, k2 is a constant) is calculated.

Note that the output of the adder circuit 14 corresponds to the sum of the surface pressure distribution p applied to the pressure detector 1, ''p■dy.

Hereinafter, it will be shown that the center position of the surface pressure can be found using the above formulas {11 and {21].

In the detector shown in FIG. 1, on the conductive plates 2 and 4, voltage distributions V^(x, y), V
8(x,y), and the resistance distribution rp in the thickness direction per unit area changes from the conductive plate 2 to the conductive plate 4 according to the pressure.
A current density distribution i(x,y) flows.

At this time, the surface resistance of the pressure sensitive plate 3 is
The voltage is constant inside the electrodes 5, 6, 7, and 8. First, consider the conductive plate 2.

The current density vector (ix(x,
y), iy(x, y)), according to Kirchhoff's current, Shibujukoto = i, and further according to voltage, riX = plexus, riy = vessel, and summarizing these equations, W^ = ri (▽2 = beauty + agriculture)...[3', and similarly for the conductive plate 4, ▽~Bco-n holds true.

First, for a bounded single connection region D of an arbitrary detector 1, let S, , S2, S3, and S4 be four sides of a square corresponding to electrodes 5, 7, 6, and 8, and set the center as the origin. Set up an orthogonal curve coordinate system like this.

According to Riemann's mapping theorem, the one-to-one conformal mapping center that maps the area ○ to the square area contact surface D* in the Cartesian coordinate system with the center as the origin and its inverse mapping J
-1 exists.

Using Karatheodori's theorem, we extend this mapping to the boundary, and then add three points P, , P2, P3 on the boundary aD of D to D*
By defining the mind as corresponding to the three vertices of the boundary aD*, and by inverse mapping it to P4, which is mapped onto the remaining one vertex aD of aD*, on the area D, S, , , An orthogonal curve coordinate system can be set in which S2, S3, and S4 are the four sides of a square, that is, P,, P2, P3, and P4 are the four vertices, and the center is the origin.
x, y), v(x, y). Then, the boundary of area ○,
That is, S, , S2, S3 for electrodes 5, 7, 6, 8
, S4, the boundary conditions can be set as follows.

First, consider the conductive plate 2. Let n be the inward line direction and m be the tangential direction on the boundary aD, where there are no electrodes, that is, at S2 and S4, there is no inflow of electrodes at the boundary, so (Western) S2 = (ticket) S4 =.

On the other hand, in S, , S3 corresponding to electrodes 5 and 6, the sum of the currents flowing in is equal to the current flowing in the external resistor R, so the voltages V^ and V8 are V^ = a + R'SI3 (
vessel) S, dm VB=a+R; (device m).

Similar boundary conditions can be set for the conductive plate 4,
S. = (ticket) Scales = o VC = -a-R Mute (deceased) 2dm VD: -a-MS43 (Gaku Mm).

Next, the first moment of the current density distribution flowing from the conductive plate 2 to the conductive plate 4 = 'JDu (x, y) i (x, y) d
Consider yIV=''Dv(x,y)i(x,y)shipdy.

First, consider lu. ■U=;ノ' according to the formula. u
(X, y)▽2V^(X,y)dXdy and using Green's theorem, u=;〃DVA(X,y)▽2u(x,y)My-yo public (X,y) Dorokomi dman 13guchi ^ (X, y) au Hishimi y) dm...'4'.

Since u is defined using conformal mapping, ▽2u
(x, y) = 0, and the second and third terms on the right side of Equation '41 can be calculated using orthogonal curves by decomposing them into each side S,, S2, S3, and S4 and substituting the boundary conditions. Let the first fundamental quantity of the coordinate system be h. = zo (heron) 20 false 2, Buddha = zoku festival) 20 iron 2, then ・u:bsuwani)(v^-vB) ---'51,
Similarly for lv ・V:b (poison ten crocodile) (vC-V.

) …[It becomes 6'. Also, the sum of the currents flowing from the conductive plate 2 to the conductive plate 4 is expressed as the sum of the currents flowing through the external resistors.
Harm ten V.

‐‐‐‐‐‐'7}. Therefore, the above '5
By dividing equations 1 and 2 by equation '7', the center position of the current density distribution flowing from the conductive plate 2 to the conductive plate 4 can be found. Furthermore, since the current density distribution i is i=muni & rp, the surface resistance r of the conductive plates 2 and 4 is sufficiently low and rp does not become low with respect to r, so v^ and v8 are It is almost constant on the conductive plate 4, and the conductance characteristic of the pressure sensitive plate 3 with respect to the force f is expressed as G=Kfn (where K is a constant and n is generally 1<n<
If a pressure-sensitive conductive rubber or the like having the relationship (value of about 3) is used, i=k3fn (K3 is a constant).

Therefore, by dividing equations '5} and '6} by equation '71, equations {1} and ■ are derived, and the center position of both pressures (x
, y) can be obtained. Using the detector 1 having such a configuration, two members 9 and 10 to be brought into close contact with each other are used.
If the detector 1 is sandwiched between the contact surfaces of , with a movable insulating plate interposed therebetween if necessary, the center position of the surface pressure can be determined in advance when both contact surfaces are in proper contact. If it coincides with the zero point and the contact surfaces of both sides are in partial contact, the center position of the pressure on the upper surface will deviate from the zero point, so it is only necessary to adjust the installation of the machine etc. to eliminate this deviation. This makes it possible to optimize the contact state of the contact surface.

When detecting such a contact state, the pressure sensitive plate 3 is used to calculate the relationship between the conductance G and the force f applied thereto, G=Kfn (where K is a constant and n is generally 1<n<
If a pressure-sensitive conductive rubber or the like is used, which has a relationship such as
′, y′), the quantity defined by J′xpndxdy Since it corresponds to the center of the case where

In addition to the center position of the surface pressure, the two members 9,
In order to grasp the contact state more accurately by simultaneously determining the contact area S of 10, a detector 1 with the same configuration as the above detector 1 using a pressure sensitive plate whose conductance changes on and off due to the action of pressure is used. An area detector may be used together with the detector 1 via a flexible insulating plate.

In this area detector, the contact area S is obtained as the output of the adding circuit 14, and the coordinates of the center position of the contact area S are determined by the above equation '1), t2}. As described in detail above, according to the present invention, the contact state at the contact surfaces of two members can be easily detected using a simple device.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a detector that detects the contact state of surfaces according to the present invention, and FIG. 2 is a configuration diagram of an arithmetic circuit connected to the detector. 1... Detector, 2, 4... Planar resistor, 3... Pressure sensitive plate, 5, 6, 7, 8...
Electrode, 9, 10...2 members, R...Resistance. Figure 1 Figure 2

Claims (1)

[Claims] 1. A first-layer sheet resistor made of a highly conductive flexible material, a second-layer pressure-sensitive plate whose conductance changes under the action of pressure, and a third-layer sheet resistor with a high conductivity. The periphery of the detector is divided into two pairs of opposing sides, and an electrode and a third electrode are provided on the pair of opposing sides of the first layer sheet resistor. Applying voltages +a and -a to the electrodes provided on the other pair of opposite sides of the layered sheet resistor through resistors, respectively,
Contact between the contact surfaces of the two members is determined based on the voltage of each pair of electrodes of the first and second planar resistors when the detector is sandwiched between the contact surfaces of the two members that are to be in close contact with each other. A method for detecting a contact state between two members, characterized by detecting a state.