KR20020072733A - Device for measuring the slack of a headliner using L.V.D.T - Google Patents

Abstract

PURPOSE: An apparatus is provided to accurately measure the displacement amount of headlining in an electrical signal and obtain correct data in a continuous manner. CONSTITUTION: An apparatus comprises a chamber(10) having a thermally insulated space with a predetermined size; a plurality of displacement sensors(21) arranged at the bottom of the chamber, and which are installed at the position for measurement of deflection amount of headlining; an analysis unit(20) for storage and analysis of the signal output from the displacement sensors; and a temperature measurement unit(30) and a humidity measurement unit(40) for controlling temperature and humidity of the chamber. The displacement sensor is a linear variable differential transformer.

Description

Device for measuring the headlining deflection using a contact displacement sensor {Device for measuring the slack of a headliner using L.V.D.T}

The present invention relates to an apparatus for measuring headlining deflection using a contact displacement sensor, and more particularly, to convert data of a physical displacement of a headlining into an electrical signal using a contact displacement sensor to continuously obtain data.

In general, the headlining is installed inside the roof panel. The headlining improves the aesthetics of the interior as interior materials, blocks noise from the outside, and protects passengers while having sound absorption, insulation, and flame retardance inside.

The headlining is usually formed by a method of molding to a loop shape of a vehicle body, and a cushioning method and a skin of sound insulation and a heat insulating material are integrally laminated and bonded by a direct bonding method to a roof. Recently, many molding methods have been applied.

Since the headlining is almost the same size as the roof panel of the vehicle body, the headlining is fixed to the roof panel by using a fixture in the middle of the vehicle. The headlining is installed by gravity and vibration caused by the vehicle. The deflection phenomenon occurs in the direction, causing a problem of poor commerciality. In particular, PUR foam or non-woven fabrics are used as the main components of the headlining, and these elements absorb moisture from the surroundings and, when left in the thermal environment in this state, thermal deformation occurs.

As a way to solve this problem, evaluation is performed on the headlining unit based on the amount of deflection and appearance deformation.

However, since the headlining manufactured in a shape similar to the body loop has a free curved surface, the above-mentioned evaluation based on visual inspection is not only difficult to check whether the headlining is deformed and sag, but also about 3 in case of deflection. In the case of ˜5 mm, it is impossible to discriminate with the naked eye, and thus an improvement is needed. In addition, since the headlining evaluation is performed at room temperature, the actual headlining is deformed or sag sensitive to temperature and humidity, which causes a problem that does not reflect the change in the surrounding environment.

The present invention has been devised in view of this point, and it is possible to obtain continuous data by forming an ambient condition similar to the conditions in which the headlining is actually used, and in particular by changing physical properties such as temperature, pressure, or position into electrical signals. It is an object of the present invention to provide a headlining deflection measuring apparatus using a contact displacement sensor that can continuously obtain more accurate data, establish objectivity for evaluation, and manage data more efficiently.

1 is a block diagram showing a deflection measurement device according to the present invention,

2 is a view showing the configuration of a contact displacement sensor according to the present invention;

[Description of Symbols for Main Parts of Drawing]

10 chamber 11 space part

12: fixture 20: analysis device

21: displacement sensor 22: core

30: temperature measuring device 31: temperature sensor

32: temperature control means 40: humidity control device

41: humidity sensor 42: humidity control means

100: headlining V1: primary side

V2, V3: secondary side

The present invention for realizing this is provided with a chamber having a predetermined size insulated and having a thermally insulated space, and a plurality of displacement sensors installed on a floor in the chamber to measure deflection of the headlining, and An analysis device for storing and analyzing a signal output from the sensor, and a temperature measuring device and a humidity measuring device for arbitrarily adjusting the temperature and humidity in the chamber.

In a preferred embodiment of the invention, the displacement sensor is characterized in that the linear displacement differential transformer (Linear Variable Differential Transformer).

Hereinafter, the configuration and operation of the present invention with reference to the accompanying drawings.

1 is a block diagram showing a deflection measuring device according to the present invention, the reference numeral 100 denotes a headlining.

According to the present invention, the headlining 100 is attached to a plurality of displacement sensors 21 installed in the chamber 10, and the displacement and deflection amount of the headlining 100 are arbitrarily adjusted while controlling the temperature and humidity in the chamber 10. It is to be able to evaluate.

Here, the chamber 10 is formed with a space portion 11 having a predetermined size therein, the space portion 11 is a fixture 12 so that the at least one headlining 100 can be mounted It is provided. In addition, the chamber 10 is preferably made of a material having a large heat insulating property in order to prevent the temperature and humidity set therein from changing.

A plurality of displacement sensors 21 are mounted on the bottom surface of the space 11 between the fixtures 12, and the displacement sensors 21 are in contact with the headlining 100 fixed to the fixture 12. It is installed to move up and down. In a preferred embodiment of the invention, the displacement sensor 21 is preferably to be able to change the mounting position arbitrarily, most preferably the lower part of the position where the deformation or deflection is most likely to occur in the headlining 100 Mount on. In addition, the displacement sensor 21 uses a linear variable differential transformer (Linear Variable Differential Transformer) for converting a change in physical characteristics into an electrical signal, the electrical signal output from the displacement sensor 12 is analyzed device 20 Will be entered.

As shown in FIG. 2, the displacement sensor 21 moves the core 22 moving up and down by the headlining 100 between the primary side V1 and the secondary sides V2 and V3. In particular, the secondary side (V2, V3) is the voltage (phase) and phase changes as the core 22 moves to the left and right, the value of the deformation and deflection of the headlining 100 by this value Can be obtained by an electrical signal.

The electrical signal obtained from the displacement sensor 21 thus obtained is input to the analysis device 20. The analysis device 20 determines from this signal whether the deformation or deflection of the headlining 100 occurs upward or downward from a difference between the voltage (voltage) and the phase of the secondary V2 and V3 on the reference point. This data is continuously dataized in real time.

On the other hand, the chamber 10 is equipped with a variety of other devices in addition to the analysis device 20, the temperature measuring device 30 and the humidity measuring device 40 to examine how the actual headlining 100 is changed in a harsh environment ) Is provided.

In a preferred embodiment of the present invention, the temperature measuring device 30 and the humidity measuring device 40 can be used to measure the temperature or humidity, as well as to arbitrarily adjust such physical characteristic values to create an environment in the chamber 10 arbitrarily. It is desirable to. To this end, the chamber 10 is equipped with a temperature sensor 31 and a humidity sensor 41 for measuring the temperature and humidity, these sensors 31, 41 are the temperature control means 32 and the humidity Each of the adjusting means 32 provides the necessary data.

Therefore, the chamber 10 can measure the deformation amount of the headlining 10 by arbitrarily adjusting physical characteristics such as temperature and humidity, as well as measuring the deformation amount of the headlining 10 mounted therein. .

As described above, the present invention uses a contact variable displacement sensor (Linear Variable Differential Transformer) to detect the deformation and deflection of the headlining, and in particular, to configure the temperature and humidity of the surrounding environment can be arbitrarily adjusted as follows: You get

1) It is possible to accurately measure the displacement amount of the headlining which is deformed finely by an electrical signal.

2) The measured displacement can be obtained as continuous data, which can be reused.

3) By controlling the temperature and humidity, the extreme conditions can be arbitrarily created to perform the heat resistance items against the rapid temperature change and the extreme humidity to judge the presence of deformation and the moisture resistance items to evaluate the durability under high temperature and high humidity conditions.

4) Since there is no need to measure data directly in extreme and hot and humid areas, safety accidents are secured because no safety accidents occur.

Claims (2)

A chamber having a predetermined size therein and insulated with spaces; A plurality of displacement sensors installed on the floor in the chamber and installed at a location for measuring the deflection amount of the headlining, and an analysis device for storing and analyzing the signals output from the sensors; Headlining deflection measuring apparatus using a contact displacement sensor, characterized in that consisting of a temperature measuring device and a humidity measuring device for arbitrarily adjusting the temperature and humidity in the chamber. The apparatus for measuring headlining deflection using a contact displacement sensor according to claim 1, wherein the displacement sensor is a linear variable differential transformer.