Rubber paste coating thickness detection device

Abstract

The utility model relates to the technical field of rubber paste production and detection, in particular to a rubber paste coating thickness detection device. The rubber paste coating thickness detection device comprises a displacement detection assembly which comprises a laser displacement sensor and an optical reflection element; the fixed supporting device comprises a roller assembly and a fixed plate; the roller assembly is used for being in contact with a to-be-detected coating paste surface and generating vertical displacement along with the height change of the paste surface; the fixing plate is installed above the roller assembly and fixedly connected with the optical reflection element. The laser displacement sensor is arranged towards the optical reflection element, and is used for detecting the displacement of the optical reflection element by emitting a laser beam to the optical reflection element and receiving a reflection light spot; and the laser displacement sensor is in signal connection with a signal processing system and is used for converting the displacement into a thickness value of the coating paste surface. The rubber paste coating thickness detection device can eliminate personal errors, improve the detection precision and realize real-time monitoring.

Description

Technical Field

[0001] This utility model relates to the field of rubber paste production and testing technology, specifically to a rubber paste coating thickness testing device. Background Technology

[0002] In the coating production process of rubber plasters (such as medicated plasters and medical hot melt adhesives), precise control of coating thickness directly affects product quality and production efficiency. Traditional testing methods mainly rely on operators' experience to visually estimate the coating thickness, followed by verification through manual cutting and weighing of plaster sheets. This method has significant limitations: low testing efficiency, usually requiring production to be paused for sampling; limited sample size, resulting in insufficient representativeness; and low accuracy of test results, easily leading to decreased product yield and batch non-compliance.

[0003] While existing X-ray thickness measurement techniques used in other industries offer high accuracy, they suffer from drawbacks such as high equipment costs and the need for special radiation protection measures, making them unsuitable for pharmaceutical manufacturing environments. Furthermore, the surface of rubber plaster possesses unique microstructural characteristics, riddled with pores and particles, forming a highly irregular and rough surface. Direct measurement using X-ray thickness measurement techniques would result in drastic fluctuations in the measurement signal due to surface undulations, failing to accurately reflect the actual coating thickness. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects and shortcomings of the existing technology and provide a rubber paste coating thickness detection device that can eliminate human error, improve detection accuracy, and achieve real-time monitoring.

[0005] The objective of this utility model can be achieved through the following technical solution:

[0006] A device for detecting the thickness of rubber paste coating, comprising:

[0007] Displacement detection components, including a laser displacement sensor and an optical reflective element;

[0008] Fixed support device, including roller assembly and fixing plate;

[0009] The roller assembly is used to contact the coating surface being tested and generates vertical displacement as the height of the coating surface changes;

[0010] The fixing plate is mounted above the roller assembly and is fixedly connected to the optical reflection element;

[0011] The laser displacement sensor is positioned facing the optical reflective element, and detects the displacement of the optical reflective element by emitting a laser beam to the optical reflective element and receiving the reflected light spot;

[0012] The laser displacement sensor is connected to a signal processing system, which converts the displacement into the thickness value of the coating paste surface.

[0013] As a preferred embodiment, the roller assembly includes a roller body with a bearing disposed therein.

[0014] As a preferred embodiment, the fixing plate is positioned above the roller body via a connecting rod, and the optical reflective element is bonded to the upper surface of the fixing plate.

[0015] As a preferred embodiment, the system also includes a lever mechanism, which comprises a lever and a lever fulcrum. The lever fulcrum is disposed on a horizontal plane, the middle part of the lever is hinged to the lever fulcrum, one end of the lever is connected to a bearing, and the other end is hinged to a connecting structure.

[0016] As a preferred embodiment, a feedback control system is also included, which is connected to the signal processing system and is used to control the coating equipment according to the thickness value.

[0017] As a preferred embodiment, the optical reflective element is an optical plane lens.

[0018] A method for detecting the thickness of rubber compound coating, implemented using the rubber compound coating thickness detection device described above, includes the following steps:

[0019] S1: Place the roller assembly on the coated paste surface;

[0020] S2: Changes in the thickness of the paste surface drive the roller assembly to generate vertical displacement, which is then transmitted to the optical reflective element via the fixed plate;

[0021] S3: The laser displacement sensor detects the displacement of the optical reflective element in real time and transmits it to the signal processing system;

[0022] S4: The signal processing system outputs the coating thickness value according to the preset correspondence between the displacement and the coating thickness.

[0023] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0024] Compared to existing technologies, traditional manual weighing methods require production interruption and have limited sampling capacity, while this invention achieves real-time monitoring through online continuous detection. Compared to X-ray thickness measurement, this invention requires no protective measures and significantly reduces equipment costs. Regarding the rough surface characteristics of the paste, existing laser ranging methods experience signal fluctuations exceeding the detection threshold during direct measurement, while this invention filters high-frequency noise and retains low-frequency thickness change signals through mechanical transmission (roller assembly-fixed plate-optical reflection element), ensuring stable and reliable measurement data. This invention effectively isolates the microscopic morphology interference of the paste surface using a mechanical transmission structure, overcoming the technical obstacle of signal distortion in direct optical measurement. Non-contact optical detection ensures displacement measurement accuracy, and combined with signal processing algorithms, accurate thickness values ​​are output, providing real-time data support for coating process control. This achieves online continuous detection of rubber paste coating thickness, eliminating the lag and sample bias of manual sampling. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the rubber plaster coating thickness detection device in Example 1;

[0026] Figure 2 This is a schematic diagram of the working process of the rubber paste coating thickness detection device in Example 1;

[0027] Figure 3 This is a schematic diagram of the rubber paste coating thickness detection device in Example 2;

[0028] Figure 4 This is a schematic diagram of the working process of the rubber paste coating thickness detection device in Example 3;

[0029] Among them: 1: laser displacement sensor, 2: optical reflection element, 3: roller assembly, 31: roller body, 32: bearing, 4: fixing plate, 5: coating surface to be tested, 6: signal processing system, 7: connecting rod, 8: feedback control system, 9: lever mechanism, 91: lever, 92: lever fulcrum, 10: laser beam. Detailed Implementation

[0030] Example 1

[0031] like Figure 1 and Figure 2 As shown, a rubber paste coating thickness detection device includes:

[0032] The displacement detection assembly includes a laser displacement sensor 1 and an optical reflective element 2;

[0033] The fixed support device includes a roller assembly 3 and a fixing plate 4;

[0034] The roller assembly is used to contact the coating surface 5 to be tested, and generates vertical displacement as the height of the coating surface changes;

[0035] The fixing plate is mounted above the roller assembly and is fixedly connected to the optical reflection element;

[0036] The laser displacement sensor is positioned facing the optical reflective element, and detects the displacement of the optical reflective element by emitting a laser beam to the optical reflective element and receiving the reflected light spot;

[0037] The laser displacement sensor is connected to a signal processing system 6, which converts the displacement into the thickness value of the coating paste surface.

[0038] The roller assembly is a mechanical structure that transmits changes in paste thickness through rolling contact. Specifically, it can be implemented using a metal roller with bearings, the diameter of which can be adjusted according to the paste width. This assembly, through continuous rolling contact with the paste surface, converts local thickness changes into overall vertical displacement, eliminating random fluctuations caused by microscopic pores. The optical reflective element is an optical device with a regular reflective plane, specifically implemented using a planar lens or prism structure. Its reflective surface forms a stable incident angle with the laser beam. This element, through a fixed connection, ensures lossless transmission of displacement, providing a stable reflective reference for laser detection. The signal processing system is a computational module that converts displacement signals into thickness data. Specifically, it can be implemented using an embedded processor or industrial computer, and its built-in algorithm establishes a linear or nonlinear mapping relationship between the displacement and the actual thickness.

[0039] Specifically, after the roller assembly comes into contact with the paste surface, the change in paste thickness drives the roller to produce a vertical displacement. This displacement is transmitted to the fixed plate through the rigid support structure (roller assembly). The optical reflective element carried by the fixed plate moves synchronously with the displacement, changing its relative position with the laser displacement sensor. The laser beam irradiates the surface of the reflective element to form a stable light spot. The laser displacement sensor calculates the displacement by analyzing the change in the position of the reflected light spot. After receiving the displacement data, the signal processing system outputs the actual thickness value based on the preset mapping relationship between the displacement and the actual thickness.

[0040] The roller assembly 3 includes a roller body 31, which has a bearing 32 installed inside.

[0041] The roller body is a cylindrical metal component that directly contacts the surface of the coating paste being tested. Specifically, it can be made of stainless steel with a polished surface. Its outer diameter is 19 mm. As the core component that bears the contact pressure of the paste surface, it has sufficient rigidity and surface smoothness to reduce rolling resistance.

[0042] Bearings are mechanical components installed inside the roller body to achieve low-friction rotation. Specifically, deep groove ball bearings or needle roller bearings can be used. The bearing axis is coaxial with the roller body, and the rolling contact between the inner and outer rings converts sliding friction into rolling friction, effectively reducing the frictional resistance between the roller assembly and the grease surface during movement.

[0043] Specifically, when the thickness of the rubber paste changes, the roller body generates rolling displacement rather than sliding displacement under the action of the bearing. The rolling elements inside the bearing, constrained by the cage, perform pure rolling motion along the raceway, reducing the frictional torque at the contact point between the roller body and the paste surface. This motion eliminates the intermittent jamming caused by the micro-roughness of the paste surface, ensuring that the roller assembly can continuously follow the vertical displacement changes of the paste surface. The free rotation characteristic of the roller body achieved through the bearing allows the device to overcome sudden changes in local resistance caused by paste particles, accurately transmitting the vertical displacement to the optical reflection element. This effectively eliminates displacement transmission distortion caused by pores in the paste surface. The bearing-supported roller body maintains structural rigidity while significantly reducing motion resistance, ensuring that the detection device can accurately capture paste thickness changes at the 0.1 mm level. This structural design allows the detection system to operate continuously and stably on the rubber paste coating production line, avoiding false or missed detections caused by the micro-structure of the paste surface.

[0044] The fixing plate is set above the roller body via the connecting rod 7, and the optical reflective element is bonded to the upper surface of the fixing plate.

[0045] The connecting rod is a rigid connecting component used to transmit the vertical displacement of the roller body. It can be implemented using a metal rod or a composite material rod. The rod structure directly transmits the roller displacement to the fixed plate, avoiding deformation or lag in intermediate links. The fixed plate is a support platform for supporting the optical reflective element. It can be implemented using a flat metal plate or a high-strength plastic plate. The rigid material keeps the reflective surface flat, ensuring optical path stability. The optical reflective element is a planar optical lens, which is fixed to the surface of the fixed plate with an adhesive. The adhesive can be epoxy resin or high-strength double-sided tape, eliminating relative displacement between the element and the supporting surface.

[0046] Specifically, the vertical displacement of the roller body caused by changes in the thickness of the paste surface is rigidly transmitted through the connecting rod, causing the fixing plate to synchronously produce an equal amount of displacement. The upper surface of the fixing plate remains flat, and the bonded optical reflective element changes position accordingly. The laser beam is projected onto the surface of the reflective element to form a light spot, and its positional change is detected by the laser displacement sensor and converted into thickness data. Due to the rigid connection between the connecting rod and the fixing plate, the displacement of the roller body is completely transmitted to the optical reflective element, avoiding displacement attenuation or hysteresis errors caused by flexible connections. At the same time, the rigid support of the fixing plate effectively isolates the interference of paste surface vibration on the optical reflective element, ensuring a stable optical path relationship between the reflective surface and the laser displacement sensor.

[0047] A method for detecting the thickness of rubber compound coating, implemented using the rubber compound coating thickness detection device described above, includes the following steps:

[0048] S1: Place the roller assembly on the coated paste surface;

[0049] S2: Changes in the thickness of the paste surface drive the roller assembly to generate vertical displacement, which is then transmitted to the optical reflective element via the fixed plate;

[0050] S3: The laser displacement sensor detects the displacement of the optical reflective element in real time and transmits it to the signal processing system;

[0051] S4: The signal processing system outputs the coating thickness value according to the preset correspondence between the displacement and the coating thickness.

[0052] Among them, the vertical displacement is the change in position along the direction of gravity, which can be characterized by the height difference between the contact surfaces of the roller and the paste surface. This displacement is linearly related to the change in paste thickness. The preset correspondence is a conversion model between displacement and thickness value, which can be realized by using a linear regression equation or calibration curve. This relationship is established through experimental calibration and can convert mechanical displacement into quantifiable thickness parameters.

[0053] Specifically, when the roller assembly contacts the paste surface, the microscopic roughness of the paste is homogenized by the roller contact surface, and the thickness change is converted into vertical movement of the roller assembly. This movement is transmitted to the optical reflective element through a rigidly connected fixed plate, and the change in position of the optical reflective element maintains a fixed proportion to the change in paste thickness. A laser displacement sensor measures the position of the optical reflective element in a non-contact manner. The laser beam emitted by the sensor is reflected by the optical reflective element to form a light spot, and the displacement data is obtained by detecting the change in the position of the light spot. The signal processing system substitutes the displacement data into a preset model for real-time calculation and finally outputs a value corresponding to the actual thickness of the paste surface.

[0054] Example 2

[0055] The difference between this embodiment and Embodiment 1 is that: Figure 3 As shown, it also includes a lever mechanism 9, which includes a lever 91 and a lever fulcrum 92. The lever fulcrum is set on a horizontal plane, the middle part of the lever is hinged to the lever fulcrum, one end of the lever is connected to a bearing, and the other end is hinged to a connecting structure.

[0056] The lever mechanism is a structural device that amplifies mechanical displacement through the lever principle. Specifically, it can be implemented by combining metal rods and hinged components, with its fulcrum fixed to form a stable center of rotation. The lever fulcrum is a fixed fulcrum that supports the lever and allows it to rotate around its axis. Specifically, it can be implemented by a support seat with a shaft hole that cooperates with a rotating shaft. Its horizontal fixation ensures that the direction of lever movement is consistent with the direction of displacement transmission.

[0057] Specifically, the vertical displacement of the roller body caused by the change in paste thickness is transmitted to one end of the lever through the bearing. When the lever rotates around the fulcrum, the displacement of the other end of the lever is amplified according to the length ratio of the two ends of the lever. The amplified displacement is transmitted to the fixed plate through the connecting rod, causing the optical reflective element to produce a larger positional change. The laser displacement sensor indirectly obtains the paste thickness change data by detecting the displacement of the reflective element.

[0058] If displacement is directly transmitted by the roller assembly alone, minute thickness changes are difficult for the laser displacement sensor to capture effectively. This invention amplifies the displacement of the roller assembly through a lever mechanism, significantly increasing the displacement amplitude of the optical reflective element. This enhances the sensitivity of the laser displacement sensor to detecting changes in paste thickness, thereby accurately identifying paste thickness fluctuations. It is particularly suitable for real-time detection of minute thickness deviations during paste application.

[0059] Example 3

[0060] The difference between this embodiment and Embodiment 1 is that: Figure 4 As shown, it also includes a feedback control system 8, which is connected to the signal processing system via wires and is used to control the coating equipment according to the thickness value.

[0061] The feedback control system is an automated adjustment unit that generates control commands based on thickness detection data. It can be implemented using a programmable logic controller (PLC) or an industrial computer. This unit receives real-time thickness data and compares it with a preset target value to generate adjustment signals for the coating equipment's actuators.

[0062] Specifically, after the laser displacement sensor detects the vertical displacement of the optical reflective element in real time, the signal processing system converts it into a thickness measurement value. The feedback control system receives this thickness value and generates control parameters, such as execution commands to adjust the coating roller gap or regulate the coating speed, using a proportional-integral-derivative algorithm. These control commands are transmitted via an industrial bus to the servo motors of the coating equipment, driving the mechanical actuators to dynamically adjust the coating process parameters. This closed-loop control architecture allows thickness deviations to be detected and corrected within seconds, eliminating the need for manual sampling.

[0063] In summary, this invention combines mechanical contact with optical detection, isolating microscopic fluctuations through a rigid transmission structure. Considering that roller contact can evenly distribute local deformation, a support structure transmits displacement to an optical plane, where a high-precision laser is used to detect the plane's displacement. Specifically, the roller assembly contacts the paste surface and transmits displacement changes, combining a laser displacement sensor and an optical reflective element to achieve non-contact measurement, converting mechanical displacement into a precise thickness value. This design filters microscopic noise through mechanical transmission and improves displacement resolution through optical detection, ultimately constructing an indirect thickness measurement system. This solves the problems of low efficiency in traditional manual inspection and high cost of existing equipment, offering advantages such as improved detection accuracy, real-time monitoring, and elimination of human error.

[0064] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A device for detecting the thickness of rubber plaster coating, characterized in that, include: Displacement detection components, including a laser displacement sensor and an optical reflective element; Fixed support device, including roller assembly and fixing plate; The roller assembly is used to contact the coating surface being tested and generates vertical displacement as the height of the coating surface changes; The fixing plate is mounted above the roller assembly and is fixedly connected to the optical reflection element; The laser displacement sensor is positioned facing the optical reflective element, and detects the displacement of the optical reflective element by emitting a laser beam to the optical reflective element and receiving the reflected light spot; The laser displacement sensor is connected to a signal processing system, which converts the displacement into the thickness value of the coating paste surface.

2. The rubber paste coating thickness detection device according to claim 1, characterized in that, The roller assembly includes a roller body, inside which a bearing is installed.

3. The rubber paste coating thickness detection device according to claim 2, characterized in that, The fixing plate is set above the roller body via a connecting rod, and the optical reflective element is bonded to the upper surface of the fixing plate.

4. The rubber paste coating thickness detection device according to claim 3, characterized in that, It also includes a lever mechanism, which includes a lever and a lever fulcrum. The lever fulcrum is set on a horizontal plane, the middle part of the lever is hinged to the lever fulcrum, one end of the lever is connected to a bearing, and the other end is hinged to a connecting structure.

5. The rubber paste coating thickness detection device according to claim 1, characterized in that, It also includes a feedback control system, which is connected to the signal processing system and is used to control the coating equipment according to the thickness value.

6. The rubber paste coating thickness detection device according to claim 1, characterized in that, The optical reflective element is an optical plane lens.

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