CN113008987A - Method and device for rapidly detecting bonding effect of brake block damping fin - Google Patents
Method and device for rapidly detecting bonding effect of brake block damping fin Download PDFInfo
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- CN113008987A CN113008987A CN202110219117.9A CN202110219117A CN113008987A CN 113008987 A CN113008987 A CN 113008987A CN 202110219117 A CN202110219117 A CN 202110219117A CN 113008987 A CN113008987 A CN 113008987A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/34—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor
- G01N29/346—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with amplitude characteristics, e.g. modulated signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention provides a method for rapidly detecting the bonding effect of a damping sheet of a brake block, which is characterized in that a detected product/test piece with a marked characteristic point is placed on a test support system, the detected product/test piece is subjected to non-contact excitation through an excitation device connected with an excitation signal output system, a signal acquisition system is used for acquiring a vibration signal on the characteristic point of the detected product/test piece, a signal processing system is used for comparing the vibration value corresponding to the acquired vibration signal on the characteristic point with the standard value of a standard piece of the vibration signal, and the product/test piece is unqualified when the vibration value is lower than the threshold value; the marking of the characteristic points refers to selecting points on a vibration amplitude pitch line/pitch surface for marking under natural frequency vibration. The invention can realize the non-contact, non-destructive, rapid and on-line detection of the bonding effect of the detected product/test piece.
Description
Technical Field
The invention relates to the technical field of rapid and online detection of bonding effect of a bonding sheet body, in particular to a flow method and a device for rapidly and online detecting the bonding effect of a brake pad damping sheet of a brake.
Background
Brake shoe damping pads are one of the primary measures of brake noise cancellation or prevention. However, in the same design, the same brake system, some brakes generate noise and some do not. One of the main reasons is: the adhesion of the brake pad damping plate is not designed due to defects (e.g., no adhesion, partial adhesion, or no complete adhesion, or almost no adhesion) that occur during manufacture. So far, nondestructive detection means for detecting the bonding effect of the damping sheet of the brake block of the brake are lacked, and the method is particularly suitable for rapid and online detection.
Disclosure of Invention
According to the technical problem that the bonding of the brake block damping sheet cannot achieve the design effect due to the defects generated during production, the method and the device for detecting the bonding effect of the brake block damping sheet of the non-contact and non-destructive brake on line are provided. The invention mainly utilizes the form of a transmission belt/a transmission belt combined with a vibration support frame to transmit a detected product/test piece, performs non-contact excitation on the detected product/test piece marked with characteristic points, acquires a vibration signal to analyze and judge whether the bonding is qualified or not, and tests the detected product/test piece in real time in an on-line transmission mode, thereby achieving the effect of quick judgment without damaging the test piece.
The technical means adopted by the invention are as follows:
a method for rapidly detecting the bonding effect of a damping sheet of a brake block is characterized in that a detected product/test piece with a marked characteristic point is placed on a test support system, non-contact excitation is carried out on the detected product/test piece through an excitation device connected with an excitation signal output system, a vibration signal on the characteristic point of the detected product/test piece is obtained through a signal obtaining system, a vibration value corresponding to the obtained vibration signal on the characteristic point is compared with a calibration value of a standard component of the vibration signal through a signal processing system, and the product/test piece is unqualified when the vibration value is lower than a threshold value; the marking of the characteristic points refers to selecting points on a vibration amplitude pitch line/pitch surface for marking under natural frequency vibration.
Further, the test support system is in a form of a conveyor belt or a form of a conveyor belt combined with a vibration support frame.
Furthermore, the vibration support frame is made of soft materials, and the structure of the vibration support frame is matched with the structure of a vibration amplitude pitch line/pitch surface of the detected product/test piece in a natural frequency vibration state; when the detected product/test piece is transmitted to a preset position, the vibration support frame is combined with the product/test piece to support the vibration amplitude pitch line/pitch surface area.
Further, the excitation device is an electromagnetic excitation device or a sound wave excitation device.
Further, the excitation is non-contact single-frequency sine wave or narrow-band frequency spectrum type excitation.
Further, the signal acquisition system adopts a laser Doppler vibration meter to acquire a vibration speed signal of the detected product/test piece; or a sound wave receiver is adopted to obtain a vibration speed signal of the detected product/test piece.
Further, the characteristic points are marked with at least two, one is a vibration amplitude maximum point and the other is a vibration amplitude minimum point.
Further, the signal processing system adopts a judgment criterion combining single-point comparison and average value comparison, wherein the average value is divided into a characteristic point average value with large vibration amplitude and a characteristic point average value with small vibration amplitude.
The invention also discloses a device for rapidly detecting the bonding effect of the brake pad damping sheet, which is applied to the method for rapidly detecting the bonding effect of the brake pad damping sheet and is characterized by comprising the following steps:
the test support system is used for conveying the detected product/test piece with the marked characteristic points;
the vibration excitation device is used for carrying out non-contact vibration excitation on the detected product/test piece and is connected with a vibration excitation signal output system;
the signal acquisition system is used for acquiring a vibration signal on the characteristic point of the detected product/test piece;
and the signal processing system is used for comparing the vibration value corresponding to the acquired vibration signal on the characteristic point with the calibration value of the standard component.
Compared with the prior art, the invention has the following advantages:
the invention excites the detected product/test piece by the electromagnetic wave or sound wave emitted by the non-contact excitation device, obtains the vibration signal on the characteristic point by the non-contact signal acquisition system, converts the vibration signal into the vibration value and compares the vibration value with the calibrated threshold value to judge whether the product is qualified or not. The whole method is rapid, can realize online real-time detection, and efficiently finishes the detection of the bonding effect on the premise of not damaging a test piece. Meanwhile, in the detection process, the detection credibility can be improved by a method of adding feature points.
Based on the reason, the method can be widely popularized in the field of detection of the bonding effect of the brake block damping fin.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a product/test piece to be tested in the invention as a brake block of a brake.
FIG. 2 is a diagram of the bonding effect of the damping plate of the brake block when the product/test piece to be tested is the brake block of the brake, wherein the circle part is a partial bonding effect area.
Fig. 3 is a schematic view of a vibration amplitude pitch line/pitch surface of a product/test piece to be detected in the invention under a vibration mode, wherein arrows on the left and right sides of the figure indicate the pitch line, and an arrow in the middle area indicates the pitch surface.
Fig. 4 is a schematic diagram of marking feature points on a product/test piece to be detected in the present invention, where point 1 and point 2 are feature points with large vibration amplitude, and point 3, point 4 and point 5 are feature points with small vibration amplitude.
Fig. 5 is a schematic diagram of marking characteristic points on a product/test piece to be detected in the present invention, wherein a black point is a characteristic point with a large vibration amplitude, and a white point is a characteristic point with a small vibration amplitude.
FIG. 6 is a schematic flow chart of a method for rapidly detecting the bonding effect of the damping pad of the brake block according to the present invention.
Fig. 7 is a schematic diagram of the structure of the vibration support frame of the present invention corresponding to the vibration amplitude pitch line/pitch surface of the product/test piece to be tested.
In the figure: 1. a conveyor belt; 2. vibrating the support frame; A. vibrating the transmission direction of the support frame; B. conveying the direction of belt transport.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. 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 a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
The invention provides a method for quickly detecting the bonding effect of a brake block damping fin, and particularly adopts a detection device comprising the following steps: the test support system is used for conveying the detected product/test piece with the marked characteristic points; the vibration excitation device is used for carrying out non-contact vibration excitation on the detected product/test piece and is connected with a vibration excitation signal output system; the signal acquisition system is used for acquiring a vibration signal on the characteristic point of the detected product/test piece; and the signal processing system is used for comparing the vibration value corresponding to the acquired vibration signal on the characteristic point with the calibration value of the standard component.
As shown in FIG. 1, the tested product/test piece is a brake pad of a brake, and the method for testing the bonding effect of the damping plate of the brake pad according to the present invention is described. As shown in fig. 2, a diagram of the vibration amplitude of the damper pad partially adhered to the brake pad is shown, and accordingly, fig. 3 is a diagram of the vibration amplitude of the damper pad completely adhered to the brake pad. The method can quickly detect the bonding effect on line under the condition of non-damaging the brake block.
As shown in fig. 3, first, a product/test piece to be detected needs to be marked with a feature point, where the marking of the feature point is to select a point on a vibration amplitude node line/node surface where the vibration amplitude value is zero under the natural frequency vibration, a black area indicated by an arrow in the figure is an area where the vibration amplitude value is zero, and corresponding points 1 and 2 shown in fig. 4 are areas where the vibration amplitude value is high. The positions of the characteristic points with large vibration amplitude and small vibration amplitude can be calibrated by measuring in advance.
The selection of the number of the characteristic points can be determined according to the production requirement 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 the number of the characteristic points is, the more accurate the detection effect is, and the more the covered area is. However, in practical application, due to the continuity of the bonding and the production process, generally, 3 to 5 points are selected as the characteristic points, as shown in fig. 4, and of course, 17 points are selected, as shown in fig. 5.
Next, a test support system of the present invention is described, wherein the test support system is in the form of a conveyor belt 1 or a conveyor belt 1 combined with a vibration support frame 2. The supporting material is soft material, such as transmission belt, rubber, etc. In the detection method of the invention, the detection can be carried out in a form of only using the transmission belt alone, or in a form of combining the transmission belt 1 and the vibration support frame 2, and the transmission belt 1+ the vibration support frame 2 is taken as an example in the embodiment.
As shown in fig. 7, the vibration support frame 2 of the present invention has a main body of a rubber body with a convex bottom (a convex portion supports a brake pad damping plate), the structure of the rubber body matches with the structure of the vibration amplitude pitch line/pitch surface of the product/test piece to be detected in the natural frequency vibration state, the shape of the rubber body is consistent, and the convex portion is supported on the vibration amplitude pitch line/pitch surface of the product/test piece to be detected, so that the support point, the support line, or the support surface of the product/test piece to be detected in the vibration state has no vibration. Further, the bulge part is upwards bulged by 1cm from the bottom of the main body of the vibration support frame 2, and the inner edge shape of the contour of the vibration support frame 2 is consistent with the geometric shape of the damping sheet of the brake block and slightly wider by about 1 mm. The portion that interior limit shape of 2 outlines of vibration support frame is widened adopts soft sponge similar material to fill, like this, and brake block damping fin test piece can slide and fall into vibration support frame 2 in can block in the outline, and inside arch just in time supports on vibration amplitude pitch line/pitch face, then waits for the test.
As shown in fig. 6, which is a schematic flow chart of the method of the present invention, a detected product/test piece marked with a feature point is placed on a conveyor belt 1, the direction of B in the drawing enters, when the detected product/test piece is conveyed onto the conveyor belt of a vibration support frame 2, that is, enters the direction of a, the detected product/test piece is combined with the vibration support frame 2, the vibration support frame 2 supports a vibration amplitude pitch line/pitch surface area, and then measurement/test is performed.
The product/test piece to be detected is subjected to non-contact type excitation through an excitation device connected with an excitation signal output system, wherein the excitation device is an electromagnetic excitation device or a sound wave excitation device, and the excitation signal output system can efficiently output a single-frequency sinusoidal signal or a rectangular narrow-band frequency wave. The non-contact vibration exciter, the electromagnetic vibration exciter and the sound wave sounding vibration exciter can be placed at the end point of the bottom of a product/test piece to be detected to send out electromagnetic waves to excite the tested piece. The number of the electromagnetic excitation heads can be 1, 2 or more, and is determined according to the actual rapid or online detection requirement.
And then, acquiring a vibration signal on the characteristic point of the detected product/test piece through a signal acquisition system, wherein the vibration signal can be acquired by irradiating a laser irradiation point of a laser Doppler vibration meter on the marked characteristic point. Or a sound wave receiver is adopted to obtain a vibration speed signal of the detected product/test piece.
Comparing the vibration value corresponding to the acquired vibration signal on the characteristic point with the calibration value of the standard component thereof by a signal processing system (an embedded software system can be adopted to improve the processing efficiency), wherein the condition that the vibration value is lower than the threshold value is unqualified in bonding; the signal processing system adopts a judgment criterion combining single-point comparison and average value comparison, wherein the average value is divided into a characteristic point average value with large vibration amplitude and a characteristic point average value with small vibration amplitude.
In order to realize efficient real-time online testing, after the testing of the first detected product/test piece is completed, the detected product/test piece is placed on the conveying belt again to be conveyed to the next station. When the vibration support frame 2 is used for online detection, at least 3 vibration support frames can be selected for mutual conversion, wherein 1 vibration support frame is arranged on a test bench, and 1 vibration support frame is arranged in transmission and is prepared to enter the test bench. Thus, the conveying and testing time is not influenced when the detected product/test piece is conveyed and tested.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A method for rapidly detecting the bonding effect of a damping sheet of a brake block is characterized in that a detected product/test piece with a marked characteristic point is placed on a test support system, non-contact excitation is carried out on the detected product/test piece through an excitation device connected with an excitation signal output system, a vibration signal on the characteristic point of the detected product/test piece is obtained through a signal obtaining system, a vibration value corresponding to the obtained vibration signal on the characteristic point is compared with a calibration value of a standard component of the vibration signal through a signal processing system, and the product/test piece is unqualified when the vibration value is lower than a threshold value; the marking of the characteristic points refers to selecting points on a vibration amplitude pitch line/pitch surface for marking under natural frequency vibration.
2. The method for rapidly detecting the bonding effect of the damping plate of the brake block according to claim 1, wherein the test support system is in a transmission belt form or a transmission belt form combined with a vibration support frame form.
3. The method for rapidly detecting the bonding effect of the damping sheet of the brake block as claimed in claim 2, wherein the vibration support frame is made of soft material, and the structure of the vibration support frame is matched with the structure of a vibration amplitude pitch line/pitch surface of a detected product/test piece in a natural frequency vibration state; when the detected product/test piece is transmitted to a preset position, the vibration support frame is combined with the product/test piece to support the vibration amplitude pitch line/pitch surface area.
4. The method for rapidly detecting the bonding effect of the damping sheet of the brake block as claimed in claim 1, wherein the vibration excitation device is an electromagnetic vibration excitation device or a sound wave vibration excitation device.
5. The method for rapidly detecting the bonding effect of the damping sheet of the brake block as claimed in claim 4, wherein the excitation is a non-contact single-frequency sine wave or a narrow-band frequency spectrum type excitation.
6. The method for rapidly detecting the bonding effect of the damping sheet of the brake block according to claim 4, wherein the signal acquisition system is used for acquiring a vibration speed signal of a detected product/test piece by adopting a laser Doppler vibrometer; or a sound wave receiver is adopted to obtain a vibration speed signal of the detected product/test piece.
7. The method for rapidly detecting the bonding effect of the damping plate of the brake block as claimed in claim 1, wherein the characteristic points are marked with at least two points, one point with the maximum vibration amplitude and the other point with the minimum vibration amplitude.
8. The method for rapidly detecting the bonding effect of the damping plate of the brake block according to claim 7, wherein the signal processing system adopts a judgment criterion combining single-point comparison and average value comparison, wherein the average value is divided into a characteristic point average value with large vibration amplitude and a characteristic point average value with small vibration amplitude.
9. A device for rapidly detecting the bonding effect of a brake pad damping sheet is applied to the method for rapidly detecting the bonding effect of the brake pad damping sheet in any one of claims 1 to 8, and is characterized by comprising the following steps:
the test support system is used for conveying the detected product/test piece with the marked characteristic points;
the vibration excitation device is used for carrying out non-contact vibration excitation on the detected product/test piece and is connected with a vibration excitation signal output system;
the signal acquisition system is used for acquiring a vibration signal on the characteristic point of the detected product/test piece;
and the signal processing system is used for comparing the vibration value corresponding to the acquired vibration signal on the characteristic point with the calibration value of the standard component.
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| CN202110219117.9A CN113008987B (en) | 2021-02-26 | 2021-02-26 | Method and device for rapidly detecting bonding effect of brake block damping fin |
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| CN202110219117.9A CN113008987B (en) | 2021-02-26 | 2021-02-26 | Method and device for rapidly detecting bonding effect of brake block damping fin |
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