CN113008987B - Method and device for rapidly detecting bonding effect of brake block damping fin - Google Patents

Abstract

The invention provides a fast detection method for the bonding effect of a brake block damping sheet, which is characterized in that the detected product/specimen marked with feature points is placed on the test support system, and is connected to the excitation signal output system The vibration excitation device performs non-contact excitation on the detected product/test piece, and then obtains the vibration signal on the feature point of the detected product/test piece through the signal acquisition system, and uses the signal processing system to obtain the vibration signal on the feature point The vibration value corresponding to the obtained vibration signal is compared with the calibration value of the standard part, and those below the threshold are unqualified for bonding; among them, the mark of the feature point refers to the selected vibration amplitude nodal line/nodal surface under the natural frequency vibration Mark the points on . The invention can realize the non-contact, non-destructive fast and on-line detection of the bonding effect on the detected product/test piece.

Description

Method and device for rapid detection of bonding effect of brake block damping sheet

technical field

The invention relates to the technical field of quick and online detection of the bonding effect of an adhesive sheet, in particular to a process, method and device for quickly and on-line detection of the bonding effect of a brake block damping sheet.

Background technique

Brake pad damping plate is one of the main measures to eliminate or prevent brake noise. However, in the same design and the same brake system, some brakes will produce noise, while others will not. One of the main reasons is that the bonding of the brake block damping plate cannot meet the design due to defects during production (such as no bonding, partial bonding, or incomplete bonding, or almost no bonding) Effect. So far, there is a lack of non-destructive testing methods to test the bonding effect of brake pads and damping sheets, especially fast and online testing.

Contents of the invention

According to the above-mentioned technical problem that the bonding of the brake block damping sheet cannot achieve the design effect due to defects during production, a non-contact, non-destructive brake block damping sheet bonding effect is provided quickly and online. Methods and devices. The invention mainly uses the transmission belt/transmission belt combined with the vibration support frame to transmit the detected product/test piece, non-contact excitation is performed on the detected product/test piece with marked feature points, and then the vibration signal is obtained Carry out analysis to judge whether the bonding is qualified, and test the tested product/test piece in real time through online transmission, so as to achieve the effect of quick judgment without destroying the test piece.

The technical means adopted in the present invention are as follows:

A fast detection method for the bonding effect of a brake block damping sheet, characterized in that the detected product/specimen marked with feature points is placed on the test support system, and the vibration excitation device connected to the excitation signal output system Perform non-contact excitation on the detected product/test piece, and then obtain the vibration signal on the feature point of the detected product/test piece through the signal acquisition system, and use the signal processing system to obtain the vibration signal on the feature point The vibration value corresponding to the vibration signal is compared with the calibration value of the standard part, and those below the threshold value are unqualified for bonding; among them, the mark of the feature point refers to the point on the nodal line/nodal surface of the selected vibration amplitude under the natural frequency vibration to mark.

Further, the test support system is in the form of a transmission belt or a combination of a transmission belt and a vibrating support frame.

Further, the vibration support frame is made of soft material, and its structure matches the structure of the vibration amplitude nodal line/nodal surface of the tested product/test piece under the natural frequency vibration state; when the tested product/test piece When transported to the preset position, it is combined with the vibration support frame to realize the support of the nodal line/nodal surface area of the vibration amplitude.

Further, the excitation device is an electromagnetic excitation device or an acoustic wave excitation device.

Further, the excitation is non-contact single-frequency sine wave or narrow-band spectrum excitation.

Further, the signal acquisition system uses a laser Doppler vibrometer to acquire the vibration velocity signal of the product/test piece to be tested; or uses an acoustic wave receiver to acquire the vibration velocity signal of the product/test piece to be tested.

Further, at least two feature points are marked, one is the point with the largest vibration amplitude, and the other is the point with the smallest vibration amplitude.

Further, the signal processing system adopts a single-point comparison and an average value comparison combined judgment criterion, wherein the average value is divided into an average value of feature points with a large vibration amplitude and an average value of feature points with a small vibration amplitude.

The present invention also discloses a fast detection device for the bonding effect of the brake block damping sheet, which is applied to the above-mentioned fast detection method for the bonding effect of the brake block damping sheet, and is characterized in that it includes:

The test support system used to transport the tested product/specimen marked with feature points;

An excitation device for non-contact excitation of the detected product/test piece, the excitation device is connected to the excitation signal output system;

A signal acquisition system for acquiring vibration signals on characteristic points of the detected product/test piece;

And a signal processing system for comparing the vibration value corresponding to the acquired vibration signal on the feature point with the calibration value of the standard part.

Compared with the prior art, the present invention has the following advantages:

In the present invention, the detected product/specimen is excited by emitting electromagnetic waves or sound waves through a non-contact excitation device, and the vibration signal on the feature point is obtained through a non-contact signal acquisition system, and the vibration signal is converted into a vibration value and then compared with the calibrated The threshold value is compared to judge whether the product bonding is qualified. The overall method is fast and can realize online real-time detection, and can efficiently complete the detection of bonding effect without destroying the test piece. At the same time, in the detection process, the reliability of detection can be improved by adding feature points.

Based on the above reasons, the present invention can be widely popularized in the field of detection of bonding effect of brake block damping sheet.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is the schematic diagram that the tested product/test piece in the present invention is a brake pad.

Fig. 2 is a bonding effect diagram of the brake pad damping sheet when the product/test piece tested in the present invention is a brake pad, wherein the circled part is a part of the bonding effect area.

Fig. 3 is a schematic diagram of the nodal line/surface of the vibration amplitude of the tested product/specimen in the vibration mode.

Fig. 4 is a schematic diagram of marked feature points on the detected product/test piece in the present invention, wherein points 1 and 2 are feature points with large vibration amplitudes, and points 3, 4 and 5 are feature points with small vibration amplitudes .

Fig. 5 is a schematic diagram of marked feature points on the tested product/test piece in the present invention, wherein black dots are feature points with large vibration amplitudes, and white dots are feature points with small vibration amplitudes.

Fig. 6 is a schematic flow chart of the rapid detection method for the bonding effect of the brake pad damping sheet according to the present invention.

Fig. 7 is a schematic diagram corresponding to the structure of the vibration support frame of the present invention and the vibration amplitude nodal line/nodal plane of the tested product/test piece.

In the figure: 1, the transmission belt; 2, the vibration support frame; A, the transmission direction of the vibration support frame; B, the transmission direction of the transmission belt.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that the terminology used here is only for describing specific embodiments, and is not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

The relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. At the same time, it should be clear that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the authorized description. In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other examples of the exemplary embodiment may have different values. It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

In the description of the present invention, it should be understood that orientation words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" etc. indicate the orientation Or positional relationship is generally based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description. In the absence of a contrary description, these orientation words do not indicate or imply the device or element referred to. It must have a specific orientation or be constructed and operated in a specific orientation, so it should not be construed as limiting the scope of the present invention: the orientation words "inside and outside" refer to inside and outside relative to the outline of each part itself.

For the convenience of description, spatially relative terms may be used here, such as "on ...", "over ...", "on the surface of ...", "above", etc., to describe the The spatial positional relationship between one device or feature shown and other devices or features. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, devices described as "above" or "above" other devices or configurations would then be oriented "beneath" or "above" the other devices or configurations. its underlying device or construction". Thus, the exemplary term "above" can encompass both an orientation of "above" and "beneath". The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing corresponding components. To limit the protection scope of the present invention.

The invention provides a fast detection method for the bonding effect of a brake block damping sheet. Specifically, the detection device used includes: a test support system for transmitting the tested product/specimen marked with feature points; The vibration excitation device for non-contact excitation of the detected product/test piece, the vibration excitation device is connected with the excitation signal output system; used to obtain the vibration signal on the characteristic point of the detected product/test piece A signal acquisition system; and a signal processing system for comparing the vibration value corresponding to the acquired vibration signal on the feature point with the calibration value of the standard part.

As shown in Fig. 1, the tested product/test piece is taken as an example of a brake block, and the test method of the present invention for the bonding effect of the brake block damping sheet is explained. As shown in Figure 2, it is the vibration amplitude diagram of the damping sheet partially bonded to the brake shoe, and correspondingly, Figure 3 shows the vibration amplitude diagram of the damping sheet completely bonded to the brake shoe. The method of the invention can quickly and on-line detect the bonding effect without destroying the brake block.

As shown in Figure 3, first, the product/specimen to be tested needs to be marked with feature points. The mark of feature points refers to the nodal line/surface of the vibration amplitude with zero vibration amplitude under the natural frequency vibration. Points are marked, and the black area pointed by the arrow in the figure is the area with zero vibration amplitude, and the corresponding points 1 and 2 shown in Figure 4 are areas with high vibration amplitude. The positions of the feature points with large vibration amplitude and small vibration amplitude can be calibrated by prior measurement.

The selection of the number of feature points can be determined according to the production requirements of the brake block damping sheet. Usually, at least two feature points are selected, one point with the largest vibration amplitude and one point with the smallest vibration amplitude. The more feature points, the more accurate the detection effect and the larger the area covered. However, in the actual application process, due to the continuity of bonding and the production process, it is generally enough to select 3-5 feature points, as shown in Figure 4, of course, 17 points can also be selected, as shown in Figure 5 Show.

Next, explain the test support system of the present invention, the test support system is in the form of a transmission belt 1 or a combination of a transmission belt 1 and a vibrating support frame 2 . The supporting material is soft material, such as transmission belt, rubber, etc. In the detection method of the present invention, the transmission belt can be used alone for detection, or the transmission belt 1 and the vibration support frame 2 can be used for detection. This embodiment takes the transmission belt 1+vibration support frame 2 as an example.

As shown in Figure 7, it is a vibration support frame 2 of the present invention, its main body is a rubber body with a raised bottom (the raised part supports the brake pad damping plate), and its structure is in the natural frequency vibration state of the detected product/test piece The structure of the vibration amplitude nodal line/nodal surface matches the structure, the shape is consistent, and the raised part is supported on the vibration amplitude nodal line/nodal surface of the product/specimen to be tested, so that the product/specimen to be tested is vibrated There is no vibration of the support point, support line, or support surface in the state. Further, the raised portion protrudes 1cm upward from the bottom of the main body of the vibration support frame 2, and the shape of the inner edge of the profile of the vibration support frame 2 is consistent with the geometric shape of the brake block damping plate, and is slightly wider than about 1mm. The wider part of the inner edge of the profile of the vibration support frame 2 is filled with a material similar to soft sponge, so that the brake block damping plate test piece can slide and fall into the vibration support frame 2 and can be stuck in the profile, and the inner protrusion is just supported in the vibration Amplitude nodal line/nodal plane, then wait for the test.

As shown in Figure 6, it is a schematic flow chart of the method of the present invention. The detected product/test piece marked with feature points is placed on the conveyor belt 1, and the direction of B shown in the figure enters, when the detected product/test piece When the test piece is transferred to the transmission belt of the vibration support frame 2, that is, when it enters the direction of A, the product/test piece to be detected is combined with the vibration support frame 2, and the vibration support frame 2 realizes the adjustment of the vibration amplitude node line/section support in the face area, then measure/test.

The detected product/test piece is subjected to non-contact excitation through an excitation device connected to the excitation signal output system, wherein the excitation device is an electromagnetic excitation device or an acoustic wave excitation device, and the excitation signal The output system can efficiently output a single-frequency sinusoidal signal, or a rectangular narrow-band frequency wave. Among them, the non-contact vibrator electromagnetic vibrator/acoustic vibrator can be placed at the end point of the bottom of the tested product/test piece to emit electromagnetic waves to excite the tested piece. There can be one, two or more electromagnetic excitation heads, depending on the actual fast or on-line detection requirements.

The vibration signal on the characteristic point of the detected product/test piece is obtained through the signal acquisition system, and the laser irradiation point of the laser Doppler vibrometer can be used to irradiate the position of the marked characteristic point to obtain the vibration signal. Or use the acoustic wave receiver to obtain the vibration velocity signal of the tested product/test piece.

Through the signal processing system (embedded software system can be used to improve the processing efficiency), the vibration value corresponding to the acquired vibration signal on the feature point is compared with the calibration value of the standard part. If it is lower than the threshold value, the bonding is unqualified; The above signal processing system adopts a single-point comparison and an average value comparison combined judgment criterion, wherein the average value is divided into an average value of feature points with a large vibration amplitude and an average value of feature points with a small vibration amplitude.

In order to achieve efficient real-time online testing, after the first tested product/test piece is tested, the tested product/test piece is shelved on the conveyor belt and transferred to the next station. When the vibration support frame 2 is used for online detection, at least 3 units can be selected for mutual conversion, one is on the test bench, one is in transmission, and one is ready to enter the test bench. In this way, the transport and test time will not be affected when transporting the tested product/specimen and testing.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (1)

1. A fast detection method for the bonding effect of a brake block damping sheet, characterized in that, The detection device used includes: a test support system for transmitting the tested product marked with feature points; A vibration excitation device for performing non-contact vibration excitation on the tested product, the vibration excitation device is connected to the vibration excitation signal output system; A signal acquisition system for acquiring vibration signals on the feature points of the detected product; And a signal processing system for comparing the vibration value corresponding to the vibration signal obtained on the feature point with the calibration value of the standard part; Specific steps are as follows: First of all, it is necessary to mark the characteristic points of the product to be tested. The marking of the characteristic points refers to selecting points on the nodal line or nodal surface of the vibration amplitude whose vibration amplitude value is zero under the natural frequency vibration, and the characteristic points are marked at least Two, one is the point with the largest vibration amplitude, and the other is the point with the smallest vibration amplitude. The positions of the feature points with large vibration amplitude and small vibration amplitude are calibrated by prior measurement; Place the tested product marked with feature points on the test support system, perform non-contact excitation on the tested product through the vibration excitation device connected to the excitation signal output system, and then obtain the detected product through the signal acquisition system. For the vibration signal on the characteristic point of the product to be detected, the vibration value corresponding to the vibration signal obtained on the characteristic point is compared with the calibration value of the standard part through the signal processing system, and the bonding is unqualified if the value is lower than the calibration value; The test support system is a transmission belt combined with a vibration support frame; The vibration support frame is made of soft material, its main body is a rubber body protruding from the bottom, and the protruding part supports the damping sheet of the brake block, and its structure is consistent with the vibration amplitude node line or node surface of the tested product in the state of natural frequency vibration. The structure is matched, the shape is consistent, and the raised part is supported on the vibration amplitude node line or joint surface of the tested product, so that the support point, support line or support surface of the tested product in the vibration state does not vibrate, and the raised part It protrudes 1cm upward from the bottom of the main body of the vibration support frame. The shape of the inner edge of the outline of the vibration support frame is consistent with the geometric shape of the brake block damping sheet, slightly wider than 1mm. The wider part of the inner edge of the outline of the vibration support frame is made of soft sponge material. Filling, so that the brake block damping plate can slide into the vibration support frame and be stuck on the contour, and the inner protrusion is just supported on the vibration amplitude node line or node surface; When the detected product is transported to the preset position, it is combined with the vibration support frame to support the vibration amplitude nodal line or nodal surface area; the vibration excitation device is an electromagnetic excitation device or an acoustic wave excitation device, not The contact excitation electromagnetic excitation device or the acoustic wave excitation device is placed at the bottom end of the product to be tested to excite the product to be tested; The signal acquisition system is to use a laser Doppler vibrometer to obtain the vibration velocity signal of the product to be detected; or to use an acoustic wave receiver to obtain the vibration velocity signal of the product to be detected; the signal processing system uses a single-point comparison and an average value Comparing the combined judgment criteria, the average value is divided into the average value of the feature points with large vibration amplitude and the average value of feature points with small vibration amplitude; After the testing of the inspected product is completed, the inspected product is placed on the conveyor belt and transferred to the next station. The vibration support frame includes 3 sets, one is on the test bench, one is in transmission, and one is ready to enter the test bench. .

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