KR20220096475A - Resistance measuring device of electrically conductive composite materials - Google Patents

Abstract

The present invention provides a resistance measuring device of electrically conductive composite materials, wherein the overall thickness of a test piece having a curved surface due to a flexible material or having nonuniform thickness can be measured accurately using a plurality of resistance probe pins being in contact with the surface of the test piece to be able to move elastically. The resistance measuring device according to the present invention comprises: upper and lower fixing plates supported by a plurality of guide rods and arranged vertically at predetermined intervals; a moving plate positioned between the upper and lower fixing plates and installed to be guided by the guide rods and moved in a vertical direction; a driving means for moving the moving plate; and a plurality of probe pins installed on the lower fixing plate and the moving plate respectively and installed so that contact portions can face each other. The probe pins are installed to movable in a vertical direction since one end thereof is inserted into cylindrical bodies installed and fixed in a vertical direction to the lower fixing plate and the moving plate respectively. An elastic member is installed elastically between one end of the probe pins and the inner wall of the cylindrical bodies, thereby always applying an elastic force in the direction of the probe pins protruding outward from the cylindrical bodies.

Description

Resistance measuring device of electrically conductive composite materials

The present invention relates to a resistance measuring device for analyzing the electrical characteristics of a composite material, and more particularly, it is possible to measure not only a test piece having a non-uniform thickness, but also a test piece (T) having a curved surface due to a flexible material. It relates to a possible resistance measuring device.

In general, when manufacturing a polymer composite material for electromagnetic wave shielding by injection molding, a difference occurs between the electrical properties of the material before injection molding and the electrical properties of the parts after injection molding, so the quality of the material is managed according to the molding process conditions. is required, and for this purpose, it is very important to analyze the electrical properties of the material after the molding process.

Conventionally, electrical characteristics can be measured using a millimeter or a 4-point probe. When using a multimeter, only one point of the test piece is measured, and when using a 4-point probe, there is a limit to accurately measuring the resistance of the test piece, such as that the relative ratio of the area to the thickness of the entire test piece must be secured, such as a semiconductor wafer. .

In addition, in Korea Patent Publication No. 10-2019-0073685, a test piece support for supporting a circular electrode test piece, a pair of test piece fixing blocks that are electrically fixed to the electrode round test piece, and the test piece fixing block are connected to the electrode A device for applying a tensile force for applying an external strain to a circular test piece, and an electrical resistance measuring device for measuring the electrical resistance of the circular electrode test piece in a state where an external strain is applied to the electrode round test piece. ' is known, and according to this resistance measuring device, the deterioration of the fuel cell electrode can be evaluated within a short time within a few days by measuring and quantifying the change in the electrical properties of the electrode circle while applying an external strain to the electrode circle, and from this Although it can help to quickly design a robust electrode, it has disadvantages in that it is difficult to accurately measure the thickness of the test piece or the curved surface of a flexible material.

In addition, in Korean Patent No. 10-1724016, two parts to be assembled with each other are each formed of a conductive composite material, and the parts in contact with each other are exposed to a conductive material through polishing to form an electrical network, so that the two parts By measuring the change in resistance according to the contact area or surface pressure, there is no need to attach a separate displacement sensor or pressure sensor. Although a device capable of self-sensing is known, it also has disadvantages in that it is difficult to accurately measure the thickness of the material or the curved surface of the flexible material.

The present invention is to solve the conventional problems as described above, the purpose of which is to use a plurality of resistance probe pins that are in contact with the surface of a test piece to be flexible and flowable, and the thickness is not constant, or bending due to a flexible material To provide a resistance measuring device capable of predicting the dispersion of fillers of composite materials by measuring the resistance distribution of the test piece as it is possible to measure the entire test piece even with a surface.

In order to achieve the above object, the present invention is supported by a plurality of guide rods, the upper and lower fixing plates are arranged to be spaced a predetermined distance up and down; a moving plate positioned between the upper and lower fixing plates and installed to be guided by the guide rod to move in the vertical direction; driving means for moving the moving plate; and a plurality of probe pins respectively installed on the lower fixed plate and the moving plate so that the contact portions face each other, wherein the probe pins have one end inserted into the cylindrical body fixed to the lower fixed plate and the moving plate in the vertical direction, respectively. is installed so as to move in the vertical direction, and an elastic member is elastically installed between one end of the probe pin in the cylindrical body and the inner wall of the cylindrical body so as to always provide an elastic force in the direction in which the probe pin protrudes outward from the cylindrical body, and an electrically conductive composite A resistance measuring device that measures the resistance of a material and can predict the filler dispersibility of a test piece from the distribution of this resistance value is characteristic.

In addition, in the present invention, the driving means includes a screw hole provided in the vertical direction in the moving plate, a screw rod screwed to the screw hole and both ends are rotatably supported on the upper and lower fixing plates, and for rotating the screw rod It is characterized by a resistance measuring device of an electrically conductive composite material composed of a deceleration motor.

In addition, in the present invention, when the test piece is placed on the probe pin of the lower fixing plate on the upper surface of the lower fixing plate, the resistance measuring device of the electrically conductive composite material having a jig block to always put it in a certain position is characterized have.

In addition, in the present invention, it is characterized in that the resistance measuring device of the conductive composite material is installed between the upper and lower fixed plates in the vertical direction to further include a position sensor bracket for detecting the position of the moving plate.

According to the present invention having the above characteristic configuration, since the contact portion of the probe pin installed to face each other on the lower fixed plate and the moving plate is elastically movable, accurate measurement is possible for a test piece having a non-uniform thickness or a curved surface, and , the movable plate is movable up and down, so it has the effect of being able to measure test pieces of various thicknesses, which has the advantage of being able to verify in the production process by measuring the electrical resistance of the material before measuring the electromagnetic wave shielding properties.

In addition, according to the present invention, as the probe pin flows elastically, the size and pressure of the contact surface can be adjusted according to the type of test piece, and both hard and soft test pieces can be measured for compatibility. have an effect.

1 is a cross-sectional view of a resistance measuring device according to the present invention from the front.
Figure 2 is a cross-sectional side view of the resistance measuring device according to the present invention.
3 is a cross-sectional view taken along line A-A' of FIG.
Figure 4 is an enlarged view showing the installation state of the probe pin in Figure 1;
Figure 5 is a state diagram of the resistance measurement of the test piece by the resistance measuring device of the present invention.
6 (a) and (b) are diagrams of the resistance measurement state of another test piece by the resistance measuring device of the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail based on the accompanying drawings. 1 to 3 show a resistance measuring device according to the present invention, and as shown, the resistance measuring device of the present invention includes upper and lower fixing plates 11 and 12 arranged vertically.

The upper and lower fixing plates 11 and 12 are installed at a predetermined distance by a plurality of guide rods 13 . The guide rod 13 is formed in a circular rod shape, is installed in the vertical direction at the four corners of the upper and lower fixing plates 11 and 12, and both ends are fixed to the upper and lower fixing plates 11 and 12, respectively.

A moving plate 14 is installed between the upper and lower fixing plates 11 and 12, and the moving plate 14 is guided so that the four guide rods 13 penetrate and ascend and descend in the vertical direction. At this time, a bushing 14a fitted to the outside of the guide rod 13 and formed long in the longitudinal direction is installed on the moving plate 14 through which the guide rod 13 passes, and the moving plate is installed on the outside of the bushing 14a. (14) is installed. Therefore, the moving plate 14 can be moved while maintaining the level precisely without left and right flow by the bushing 14a when ascending and descending.

The moving plate 14 moves in the vertical direction by a driving means as shown in FIG. 2 . The driving means includes a screw hole 21 provided in the vertical direction in the moving plate 14, and a screw rod 22 screw-fitted to the screw hole 21 so that both ends are rotatably supported by the upper and lower fixing plates 11 and 12. ) and a reduction motor 23 for rotating the screw rod 22 .

At this time, the screw hole 21 may be directly formed in the moving plate 14, but the bushing 14b is fixed and installed by penetrating the moving plate 14, and the screw hole 21 is formed in the bushing 14b. Preferably, the screw rod 22 rotates and supports the upper and lower ends with the bushings 11a and 12a interposed between the upper and lower fixing plates 11 and 12 so that they can be rotated in place.

In addition, the position of the screw rod 22 is set to a position in which the rotational motion of the screw rod 22 is smoothly transferred to the vertical movement of the moving plate 14 without interfering with the arrangement of the probe pin 31 to be described later. it is preferable In this embodiment, as shown in FIG. 3 , it is exemplified that the screw rod 22 is installed at the rear of the moving plate 14 and in the middle of both guide rods 13 . In addition, although the screw rod 22 is exemplified as a component of the driving means, any component that converts rotational motion into linear motion, such as a rack and pinion, is applicable.

Probe pins 31 for measuring resistance in contact with the surface of the test piece T are installed on the lower fixed plates 11 and 12 and the moving plate 14, respectively. A plurality of probe pins 31 installed on the lower fixing plates 11 and 12 and the moving plate 14 are installed so that the contact portions 31a face each other. In this embodiment, the probe pins 31 are arranged in seven rows. Although it is exemplified that all 49 are arranged for overheating, it can be increased or decreased according to the specifications of the resistance measuring device, and the plurality of probe pins 31 are electrically connected to a multimeter (not shown) and a plurality of probe pins Through (31), it becomes possible to measure the resistance at various points of the test piece (T).

In addition, the probe pin 31 of the present invention is installed on the lower fixing plates 11 and 12 and the moving plate 14 so that the position of the contact portion 31a flows elastically in the vertical direction. Since the installation configuration of the probe pin 31 is the same on both the lower fixed plate 11 and 12 side and the moving plate 14 side, a case in which the probe pin 31 is installed on the moving plate 14 will be described.

That is, as shown in Figs. 4 (a) and (b), the hollow cylindrical body 32 is penetrated and fixed to the moving plate 14 in the vertical direction, and the probe pins 31 in the cylindrical body 32 are fixed. ), but insert the opposite end of the contact portion (31a), the contact portion (31a) is installed to be exposed to the outside of the cylindrical body (32) to be able to flow in the vertical direction.

An elastic member 33 is elastically installed between the cylindrical body 32 and one end of the probe pin 31 in the cylindrical body 32 . In this embodiment, the elastic member 33 is composed of a compression coil spring. One end of the compression coil spring is elastically supported on the inner wall of the cylindrical body 32, and the other end is elastically supported on one end of the probe pin 31, thereby providing a probe pin ( 31) can always provide an elastic force in the direction in which it protrudes outward from the cylindrical body 32, whereby the contact portion 31a of the probe pin 31 becomes elastically movable for a predetermined distance.

Referring back to FIGS. 1 to 3 , when the test piece T is placed on the probe pin 31 of the lower fixing plate 12 on the upper surface of the lower fixing plate 12 , a jig that can always be placed at a constant position A block 15 is provided, and the jig block 15 is disposed to correspond to one row and column of the probe pins 31 arranged in plurality in rows and columns. In addition, a position sensor bracket 16 is installed in the vertical direction between the upper and lower fixing plates 12 to detect the position of the moving plate 14 .

The operation of the resistance measuring device having such a configuration will be described as follows. First, as shown in FIGS. 1 to 3, when a test piece (T) for measuring resistance is placed on the probe pin (31) installed on the lower fixing plate (12), the lower surface of the test piece (T) is a plurality of probe pins ( 31) in a state of being in contact with the contact portion 31a. At this time, if the edge of the test piece T is brought into contact with the jig block 15, in the case of the same test piece T, it is always located at the same position to measure the resistance at the same point, thereby allowing multiple test pieces T in the same process. When measuring , process variables can be derived from the measured values.

Then, when the screw rod 22 is rotated by driving the speed reduction motor 23 as in FIGS. 1 and 2 , the screw hole 21 of the screw rod 22 and the moving plate 14 is screwed together, so it moves The plate 14 moves downward and is guided by the four guide rods 13 to gradually descend while maintaining the horizontal level.

When the moving plate 14 descends, as shown in FIG. 5 , the contact portions 31a of the probe pins 31 installed in a plurality of the moving plate 14 come into contact with the upper surface of the test piece T, and at this time, the reduction motor ( 23) stops the driving of the moving plate 14 to stop the descent, thereby measuring the resistance of the test piece (T) in multiple places by the plurality of probe pins (31) in contact with both surfaces of the test piece (T). there will be

Figure 5 shows the measurement state when the thickness of the test piece (T) is constant, as shown in Figure 6 (a) and (b), even when the thickness of the test piece (T) is different or a curved surface is formed measurement is possible.

That is, when the moving plate 14 descends and the contact portion 31a of the probe pin 31 comes into contact with the test piece T1 having a different thickness, as in Fig. 6 (a), corresponding to the thickness of the test piece T As the probe pin 31 flows and the length protruding from the cylindrical body 32 becomes different, measurement is possible, and even when a curved surface is formed on the test piece T as in FIG. 6(b), in response to the curved surface Since the length of the probe pin 31 protruding from the cylindrical body 32 is different due to the flow, measurement is also possible.

As such, in the present invention, accurate measurement is possible even for a test piece (T) having a non-uniform thickness or a curved surface, and by moving the moving plate 14 up and down, it is possible to measure a test piece (T) of various thicknesses. In addition, as the contact portion 31a of the probe pin 31 flows elastically, the size and pressure of the contact surface can be adjusted according to the type of the test piece T, and the hard test piece T and the soft ) of the test piece (T) is all possible.

The embodiments described so far are merely illustrative of preferred embodiments of the present invention, and the scope of the present invention is not limited to the described embodiments, and within the spirit and claims of the present invention, those skilled in the art can Various changes, modifications or substitutions will be possible by this, and it should be understood that such embodiments fall within the scope of the present invention.

11, 12: upper, lower fixing plate 13: guide rod
14: moving plate 15: jig block
16: position sensor bracket 21: screw hole
22: screw rod 23: reduction motor
31: probe pin 31a: contact
32: cylindrical body 33: elastic member

Claims (3)

an upper and lower fixing plate supported by a plurality of guide rods and arranged to be vertically spaced apart from each other by a predetermined distance;
a moving plate positioned between the upper and lower fixing plates and installed to be guided by the guide rod to move in the vertical direction;
driving means for moving the moving plate; and
It includes a plurality of probe pins respectively installed on the lower fixed plate and the moving plate so that the contact parts face each other,
The probe pin is installed so that one end is inserted into the cylindrical body fixedly installed in the vertical direction on the lower fixed plate and the moving plate, respectively, and moves in the vertical direction, and an elastic member is elastically installed between the one end of the probe pin in the cylindrical body and the inner wall of the cylindrical body. A resistance measuring device of an electrically conductive composite material, characterized in that the probe pin is always provided with an elastic force in a direction protruding outward from the cylindrical body. According to claim 1, wherein the driving means,
Electrical conductivity, characterized in that it consists of a screw hole provided in the vertical direction in the moving plate, a screw rod screwed to the screw hole, both ends supported by rotation on the upper and lower fixing plates, and a deceleration motor for rotating the screw rod Composite resistance measuring device. The resistance measurement of an electrically conductive composite material according to claim 1, wherein a jig block is provided on the upper surface of the lower fixing plate to always place the test piece on the probe pin of the lower fixing plate. Device.

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