Automobile sound absorbing cotton linearization thickness detection device and method

Abstract

This invention discloses a linearized thickness detection device and method for automotive sound-absorbing cotton, relating to the field of sound-absorbing cotton processing quality inspection technology. The invention includes a transmission component, a displacement guide, a lateral movement mechanism, a micro servo motor, a rotating probe, an auxiliary drive roller, and a driven roller. Through the coordinated movement of the lateral movement mechanism and the rotating probe, the auxiliary drive roller and the driven roller straighten the sound-absorbing cotton. The detection module continuously collects thickness data, which is processed by the PCB motherboard and transmitted to an external terminal. This invention achieves full-range lateral coverage detection of automotive sound-absorbing cotton, reducing missed detections, avoiding detection errors caused by wrinkles or excessive stretching of the sound-absorbing cotton, preventing interference from sound-absorbing cotton lint to the detection module, and improving detection accuracy and efficiency. It is suitable for thickness quality control in the production process of automotive sound-absorbing cotton.

Description

Technical Field

[0001] This invention relates to the field of sound-absorbing cotton processing quality inspection technology, and in particular to a device and method for detecting the linearized thickness of automotive sound-absorbing cotton. Background Technology

[0002] Automotive sound-absorbing cotton is a core component for optimizing the NVH (noise, vibration, and harshness) performance of the entire vehicle. Its thickness uniformity directly determines the sound insulation and vibration reduction effect and also affects its compatibility with vehicle body parts. Therefore, thickness detection during the production process is a key link in quality control. Currently, the sound-absorbing cotton thickness detection devices in the industry still have many technical shortcomings and are difficult to meet the high precision and high efficiency requirements of industrial continuous production.

[0003] Existing testing equipment mostly uses a single fixed probe or a small number of discrete probes. A single test can only cover one or a few points on the sound-absorbing cotton, and cannot achieve continuous scanning of the entire horizontal range. For wide-width automotive sound-absorbing cotton, it is necessary to adjust the probe position or move the material multiple times to complete the test. This is not only inefficient, but also prone to missing points, leading to missed detections of local thickness deviations, and thus failing to fully guarantee product quality.

[0004] In the process of material conveying and inspection, existing equipment lacks an effective leveling mechanism. As a soft fiber material, sound-absorbing cotton is prone to wrinkles due to uneven tension during transmission, or excessive stretching due to improper driving force of the conveying mechanism. Both of these situations will directly cause distortion of thickness detection data.

[0005] In addition, sound-absorbing cotton is prone to fiber shedding during transportation and testing. These shedding particles can easily adhere to the detection probe, especially for high-precision detection elements such as infrared distance photoelectric probes, which can seriously interfere with the detection signal, causing frequent data fluctuations and further reducing the detection accuracy.

[0006] In summary, overcoming the significant shortcomings of existing automotive sound-absorbing cotton thickness detection devices in terms of detection coverage, data accuracy, and anti-interference capabilities has become an urgent technical problem to be solved. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0008] This invention provides a linearized thickness detection device for automotive sound-absorbing cotton, including a transmission assembly, a displacement guide fixed above the transmission assembly, a lateral movement mechanism mounted on the displacement guide, and a set of travel limiters configured on the displacement guide. A micro servo motor is fixed to the bottom of the lateral movement mechanism, with the output end of the micro servo motor facing vertically downward and connected to a connecting rod. A rotating probe is fixed to the lower part of the connecting rod. The rotating probe includes an annular housing, a detection module, and a PCB motherboard. The detection module is electrically connected to the PCB motherboard, and the detection direction of the detection module is vertically downward. A lower frame is fixedly mounted to the bottom of the micro servo motor, and a brush assembly is configured inside the lower frame. The brush assembly is electrically connected to the PCB motherboard. Multiple fan blades protrude from the bottom surface of the annular housing, and an airflow filter frame is fixedly mounted inside the multiple fan blades. An auxiliary drive roller and a driven roller are also installed above the transmission assembly, which are in pressure contact with the upper surface of the sound-absorbing cotton. The auxiliary drive roller is connected to an auxiliary micro motor, and the driven roller is connected to a damper.

[0009] As a preferred technical solution of the detection device of the present invention: an end cap is fixedly installed on the top of the annular shell, the annular shell is provided with an inner groove and multiple mounting holes, and the PCB motherboard is installed in the inner groove;

[0010] The inner groove opening faces upward, the mounting hole is located at the bottom of the annular shell and communicates upward with the inner groove, and the detection module is installed at the mounting hole position;

[0011] A PIN electrical socket is provided on the side of the end cap facing the inner groove. The PIN electrical socket is electrically connected to the brush assembly and is connected to the PCB motherboard through electrical wires.

[0012] As a preferred technical solution of the detection device of the present invention: the connecting rod moves through the lower frame, and the lower part of the connecting rod is inserted into and fixed at the axis of the rotating probe.

[0013] As a preferred technical solution of the detection device of the present invention: the airflow filter frame is provided with a metal filter screen, and the metal filter screen faces the gap between adjacent fan blades.

[0014] As a preferred technical solution of the detection device of the present invention: the PCB motherboard is equipped with a wireless module, and the detection module adopts an infrared distance photoelectric probe.

[0015] As a preferred technical solution of the detection device of the present invention: the auxiliary drive roller is located downstream of the detection area of ​​the rotating probe, and the driven roller is located upstream of the detection area of ​​the rotating probe.

[0016] As a preferred embodiment of the detection device of the present invention: the travel limiter is installed on the displacement guide and is set according to the lateral distribution range of the sound-absorbing cotton. The lateral movement mechanism is connected to an external servo drive device, and the lateral movement mechanism and the displacement guide are connected by a sliding fit.

[0017] This invention provides a method for detecting the linearized thickness of automotive sound-absorbing cotton, comprising the following:

[0018] S1. Based on the lateral width L of the sound-absorbing cotton, adjust the position of the travel limit switch on the displacement guide and set the lateral movement boundary of the lateral movement mechanism.

[0019] S2. Activate the conduction component, driving the sound-absorbing cotton at a preset speed V. z Uniform speed conveying.

[0020] S3. Start the auxiliary micro motor to drive the auxiliary drive roller to rotate, which in turn straightens the sound-absorbing cotton with the damper driven roller.

[0021] S4. Start the external servo drive device and control the transverse mechanism to move at speed V. h It moves laterally along the displacement guide. Wherein, V h =2L / T x T x T is the time it takes for any point of the sound-absorbing cotton to completely cross the rotating detection zone. x =D / V z D is the length of the rotating detection area, which is the detection diameter of the rotating detection element.

[0022] S5. Start the micro servo motor, which drives the rotating probe to rotate circumferentially through the connecting rod. Together with the lateral movement driven by the lateral movement mechanism, a rotating detection area is formed.

[0023] S6. The detection module continuously collects the thickness data of the sound-absorbing cotton while it is moving at a constant speed during the coordinated rotation and lateral movement.

[0024] S7. The rotating fan blades of the annular housing generate airflow, which is filtered by the airflow filter frame and then blown toward the detection module.

[0025] The S8 PCB motherboard receives and processes data, and transmits it to an external terminal via a wireless module.

[0026] Compared with existing technologies, the beneficial effects of this invention are:

[0027] 1. This invention utilizes the coordinated movement of a lateral movement mechanism and a rotating detector. The lateral movement mechanism precisely controls the reciprocating speed according to set requirements, and in conjunction with the circumferential rotation of the rotating detector, forms a comprehensive rotating detection area. This eliminates the need for numerous probes to achieve basic coverage of the sound-absorbing cotton's lateral range, ensuring that most areas can be detected and significantly reducing the problem of missed detections.

[0028] 2. The device of the present invention is equipped with an auxiliary drive roller and a driven roller with a damper. By adapting the damping force to straighten the sound-absorbing cotton, it effectively avoids detection errors caused by wrinkles or excessive stretching. At the same time, the fan blades of the rotating detector generate airflow, which is filtered by the metal filter of the airflow filter frame and blows onto the detection module to prevent sound-absorbing cotton debris from interfering with the infrared probe and reduce data fluctuations. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention.

[0030] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle.

[0031] Figure 3 for Figure 2 A magnified structural diagram of section B in the middle.

[0032] Figure 4 This is a component disassembly diagram of the rotating probe of the present invention.

[0033] Figure 5 This is a top view schematic diagram of the rotating detector moving laterally along the rotating detection area in this invention.

[0034] The components are as follows: 1-Conduction component; 2-Sound-absorbing cotton; 3-Displacement guide; 4-Transverse movement mechanism; 5-Stroke limiter; 6-Micro servo motor; 7-Connecting rod; 8-Lower frame; 9-Brush assembly; 10-Rotating detector; 1001-Annular housing; 10011-Inner groove; 10012-Mounting hole; 10013-Fan blade; 1002-End cap; 10021-PIN electrical socket; 1003-Detection module; 1004-PCB motherboard; 11-Airflow filter frame; 1101-Metal filter screen; 12-Auxiliary drive roller; 13-Auxiliary micro motor; 14-Driven roller; 15-Damper; 16-Rotating detection area. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0036] Example 1: The device of the present invention mainly includes a transmission component 1, a displacement guide component 3, a transverse movement mechanism 4, a micro servo motor 6, a rotation detection component 10, an auxiliary drive roller 12, a driven roller 14, and supporting electrical control components. The components work together to achieve linear thickness detection of the sound-absorbing cotton 2.

[0037] (a) Transmission and guidance mechanisms (such as...) Figure 1 , Figure 2 )

[0038] The transmission component 1 is equipped with a conveyor belt, which drives the sound-absorbing cotton 2 to move forward at a preset speed, providing a stable material conveying foundation for testing.

[0039] The displacement guide 3 is fixedly installed above the transmission assembly 1, providing sliding support for the transverse mechanism 4 and serving as a guide for the transverse movement.

[0040] The travel limiter 5 is installed on the displacement guide 3 and is set to correspond to the lateral distribution range of the sound-absorbing cotton 2, in order to limit the lateral movement boundary of the lateral movement mechanism 4.

[0041] The transverse mechanism 4 is connected to an external servo drive device and is connected to the displacement guide 3 by a sliding fit. It can drive the micro servo motor 6, the rotating probe 10 and other components below to move along the transverse direction of the sound-absorbing cotton 2.

[0042] (ii) Detection drive and connection components (such as...) Figure 1 , Figure 2 , Figure 4 )

[0043] The micro servo motor 6 is fixed on the bottom side of the transverse mechanism 4, with its output end facing vertically downward and connected to the connecting rod 7. It can output torque to drive the connecting rod 7 and the rotating probe 10 to rotate circumferentially.

[0044] The connecting rod 7 moves through the lower frame 8, and its lower part is inserted into and fixed at the axis of the rotating probe 10.

[0045] The lower frame 8 is fixedly installed on the bottom side of the micro servo motor 6, and the inner perimeter is equipped with a brush assembly 9, which provides a mounting carrier for powering the rotating probe 10.

[0046] The brush assembly 9 is externally connected to a power supply and internally connected to the PCB motherboard 1004 via a PIN electrical socket 10021, so as to achieve continuous and stable power supply to the rotating probe 10 in the rotating state.

[0047] (iii) Rotating detectors (such as...) Figure 1 , Figure 3 , Figure 4 )

[0048] The annular housing 1001 has an inner groove 10011, multiple mounting holes 10012, and multiple fan blades 10013. The inner groove 10011 opens upwards for mounting the PCB motherboard 1004. The mounting holes 10012 are located at the bottom and communicate upwards with the inner groove 10011 for mounting the detection module 1003. The fan blades 10013 protrude from the bottom surface and generate airflow when rotated.

[0049] The end cap 1002 is fixedly installed above the annular housing 1001, and a PIN electrical socket 10021 is configured on the side facing the inner groove 10011 to realize the electrical connection between the brush assembly 9 and the PCB motherboard 1004 through the electrical wire.

[0050] The detection module 1003 is installed at the mounting hole 10012 of the annular housing 1001, with the detection direction vertically downward. It adopts an infrared distance photoelectric probe and is electrically connected to the PCB motherboard 1004. It is responsible for continuously collecting the thickness data of the sound-absorbing cotton 2.

[0051] The PCB motherboard 1004 is installed in the inner groove 10011 of the annular housing 1001. It is equipped with a wireless module, which can receive and process the data collected by the detection module 1003, and then transmit it to an external terminal through the wireless module.

[0052] The airflow filter frame 11 is fixedly installed inside the multiple fan blades 10013 and is provided with a metal filter screen 1101. The metal filter screen 1101 faces the gap between adjacent fan blades 10013 and is used to filter the sound-absorbing cotton falling off the airflow when the airflow flows back.

[0053] (iv) Auxiliary leveling components (such as...) Figure 1 , Figure 5 )

[0054] The auxiliary drive roller 12 is located downstream of the rotating detection area 16 of the rotating detection element 10 and is connected to the auxiliary micro motor 13. It is driven to rotate by the auxiliary micro motor 13 and works with the driven roller 14 to level the sound-absorbing cotton 2.

[0055] Driven roller 14 is located upstream of the rotation detection area 16 of the rotation detection element 10 and is connected to damper 15. Through damping action, it works with auxiliary drive roller 12 to straighten sound-absorbing cotton 2. Damper 15 provides appropriate damping force to prevent sound-absorbing cotton 2 from wrinkling or stretching deformation.

[0056] Example 2: This invention designs a method for detecting the linearized thickness of automotive sound-absorbing cotton, the details of which are as follows:

[0057] (I) Equipment Initialization and Calibration

[0058] Based on the lateral width L of the sound-absorbing cotton 2, adjust the position of the travel limiter 5 on the displacement guide 3, define the lateral movement boundary of the lateral movement mechanism 4, and reserve reasonable redundancy in the spacing of the travel limiters 5 to ensure coverage of the entire lateral area of ​​the sound-absorbing cotton 2.

[0059] If equipment and other conditions permit, check the electrical connection stability between the brush assembly 9 and the PCB motherboard 1004, monitor the fluctuation range of the power supply voltage, and ensure that it does not affect the data acquisition accuracy of the detection module 1003.

[0060] If high detection accuracy is required, a standard block of known thickness (covering the normal thickness range of the sound-absorbing cotton to be tested) can be used. Place the standard block in the detection area, collect multiple sets of data and compare them with the standard thickness. Adjust the sensitivity of the detection module 1003 through the PCB motherboard 1004 calibration program to eliminate the initial error.

[0061] (ii) Material conveying and leveling

[0062] Activate the conduction component 1, driving the sound-absorbing cotton 2 at a preset speed V. z Uniform speed conveying, V zThe thickness can be adjusted according to the characteristics of the sound-absorbing cotton 2 to balance the detection accuracy and production efficiency.

[0063] Start the auxiliary micro motor 13 to drive the auxiliary drive roller 12 to rotate. Under the damping action of the damper 15, the driven roller 14 cooperates with the auxiliary drive roller 12 to straighten the sound-absorbing cotton 2, ensuring that the sound-absorbing cotton 2 is free of wrinkles and excessive stretching deformation.

[0064] The damper 15 needs to provide appropriate damping force. If the damping force is too small, it will not be able to effectively straighten the wrinkles of the sound-absorbing cotton 2. If the damping force is too large, it will easily cause the sound-absorbing cotton 2 to be stretched and deformed (especially for soft sound-absorbing cotton 2). Trial production and debugging are required until the sound-absorbing cotton 2 is wrinkle-free and has no stretching marks.

[0065] (III) Coordinated Control of Detection Motion

[0066] The transverse mechanism 4 is controlled by an external servo drive device at a speed of V. h Move laterally along displacement guide 3, V h Through formula V h =2L / T x Calculate, T x The time it takes for any point of the sound-absorbing cotton 2 to completely cross the rotating detection area 16, where T x =D / V z L is the lateral width of the sound-absorbing cotton, and D is the longitudinal length of the rotating detection area 16 (i.e., the detection diameter of the rotating detection element 10).

[0067] Start the micro servo motor 6, which drives the rotating probe 10 to rotate circumferentially through the connecting rod 7. Accompanied by the lateral movement of the rotating probe 10, the rotating probe area 16 is formed under the combined action.

[0068] Through the above control method, it is ensured that when any point of the sound-absorbing cotton 2 completely crosses the rotating detection area 16, the lateral movement mechanism 4 drives the rotating detection element 10 to complete one round trip movement, avoiding detection blind spots [because if any point of the sound-absorbing cotton 2 completely crosses the rotating detection area 16, and the rotating detection element 10 only completes movement in a single direction, there will be an undetectable area of ​​the sound-absorbing cotton 2 behind it in the direction of movement (since the sound-absorbing cotton 2 is continuously moving). And in T... x Within a short time, the rotating detector 10 can basically cover the sound-absorbing cotton 2 of the rotating detector area 16 in one round trip.

[0069] (iv) Data acquisition, protection and transmission

[0070] During the coordinated rotation and lateral movement, the detection module 1003 continuously collects the thickness data of the sound-absorbing cotton 2 in a uniform forward state and transmits it to the PCB motherboard 1004. The PCB motherboard 1004 receives and processes the data and transmits it to an external terminal in real time through a wireless module to complete the linearized thickness detection.

[0071] The fan blades 10013 of the annular housing 1001 rotate to generate airflow, which is filtered by the metal filter screen 1101 of the airflow filter frame 11 and then blown onto the detection module 1003 to prevent sound-absorbing cotton detachment from interfering with the detection module 1003.

[0072] (v) Other key technical parameters and adaptation requirements

[0073] The rotational speed n of the rotating probe 10 needs to be related to V. z Adaptation, V z The faster the sampling frequency, the more n needs to be increased to ensure that the sampling frequency meets the detection requirements.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A linear thickness detection device for automotive sound-absorbing cotton, characterized in that: Includes a transmission component (1), which is equipped with a transmission belt to drive the sound-absorbing cotton (2) to move forward at a preset speed. A displacement guide (3) is fixed above the transmission component (1), and a transverse movement mechanism (4) is installed on the displacement guide (3). A set of travel limiters (5) are configured on the displacement guide (3) to correspond to the transverse distribution range of the sound-absorbing cotton (2). The bottom side of the transverse mechanism (4) is fixed with a micro servo motor (6), the output end of the micro servo motor (6) is vertically downward and connected to the connecting rod (7), and the lower part of the connecting rod (7) is fixed with a rotating probe (10). The rotating detector (10) includes an annular housing (1001), a detection module (1003) and a PCB motherboard (1004). The detection module (1003) is electrically connected to the PCB motherboard (1004), and the detection direction of the detection module (1003) is vertically downward. Among them, the micro servo motor (6) is fixedly mounted on the bottom side of the lower frame (8), and the lower frame (8) is equipped with a brush assembly (9) to provide a mounting carrier for power supply to the rotating probe (10). The brush assembly (9) is electrically connected to the PCB motherboard (1004). The bottom surface of the annular shell (1001) is provided with multiple fan blades (10013), which generate airflow when rotated. An airflow filter frame (11) is fixedly installed inside the multiple fan blades (10013). An auxiliary drive roller (12) and a driven roller (14) are also installed above the conductive component (1) to press against the upper surface of the sound-absorbing cotton (2). The auxiliary drive roller (12) is connected to an auxiliary micro motor (13), and the driven roller (14) is connected to a damper (15). The damping action works in conjunction with the auxiliary drive roller (12) to straighten the sound-absorbing cotton (2). An end cap (1002) is fixedly installed on the top of the annular housing (1001). The annular housing (1001) is provided with an inner groove (10011) and multiple mounting holes (10012). The PCB motherboard (1004) is installed in the inner groove (10011). The inner groove (10011) has an upward opening, the mounting hole (10012) is located at the bottom of the annular shell (1001) and communicates upward with the inner groove (10011), and the detection module (1003) is installed at the mounting hole (10012). The end cap (1002) is provided with a PIN electrical socket (10021) on the side facing the inner groove (10011). The PIN electrical socket (10021) is electrically connected to the brush assembly (9). The PIN electrical socket (10021) is connected to the PCB motherboard (1004) through an electrical wire. The connecting rod (7) moves through the lower frame (8), and the lower part of the connecting rod (7) is inserted into and fixed at the axis of the rotating probe (10); The airflow filter frame (11) is provided with a metal filter screen (1101), which faces the gap between adjacent fan blades (10013). When the airflow returns, it is used to filter the sound-absorbing cotton falling off in the airflow. The PCB motherboard (1004) is equipped with a wireless module, and the detection module (1003) adopts an infrared distance photoelectric probe.

2. The linearized thickness detection device for automotive sound-absorbing cotton according to claim 1, characterized in that: The auxiliary drive roller (12) is located downstream of the detection area of ​​the rotating probe (10), and the driven roller (14) is located upstream of the detection area of ​​the rotating probe (10).

3. The linear thickness detection device for automotive sound-absorbing cotton according to claim 1, characterized in that: The travel limiter (5) is installed on the displacement guide (3) and is set in the lateral distribution range corresponding to the sound-absorbing cotton (2); The transverse mechanism (4) is connected to an external servo drive device, and the transverse mechanism (4) and the displacement guide (3) are connected by a sliding fit.

4. A method of detecting linearized thickness of an automobile sound absorbing cotton, characterized by, A linearized thickness detection device for automotive sound-absorbing cotton, as described in any one of claims 1 to 3, comprises the following: S1. Based on the transverse width L of the sound-absorbing cotton (2), adjust the position of the travel limiter (5) on the displacement guide (3) and set the transverse boundary of the transverse mechanism (4); S2, start the conducting assembly (1), drive the sound-absorbing cotton (2) at a preset speed V z Uniform speed conveying; S3. Start the auxiliary micro motor (13) to drive the auxiliary drive roller (12) to run, and cooperate with the driven roller (14) with damper (15) to straighten the sound-absorbing cotton (2). S4, start the external servo drive device to control the horizontal moving mechanism (4) to move along the displacement guide (3) at a speed V h along the displacement guide (3) wherein V h = 2L / T x ; Where T x is the time for sound-absorbing cotton (2) at any point to completely cross the rotating detection area (16), T x = D / V z ; Where D is the length of the rotating detection area (16), that is, the detection diameter of the rotating detection element (10); S5. Start the micro servo motor (6), which drives the rotating probe (10) to rotate circumferentially through the connecting rod (7), and coordinates with the transverse movement mechanism (4) to form a rotating detection area (16). S6, the detection module (1003) continuously collects the thickness data of the sound-absorbing cotton (2) in the state of uniform forward movement during the coordinated rotation and lateral movement; S7. The fan blades (10013) of the annular shell (1001) rotate to generate airflow, which is filtered by the airflow filter frame (11) and then blown toward the detection module (1003). The S8 and PCB motherboard (1004) receive and process data, and transmit it to an external terminal via a wireless module.

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