A hardness detection device for a vehicle-mounted film and a detection method thereof

Abstract

The present application relates to the technical field of vehicle-mounted film detection, and discloses a hardness detection device and method for vehicle-mounted film, which comprises a detection frame capable of linear displacement, a winding mechanism mounted on the detection frame, the winding mechanism being used for setting tension parameters of the vehicle-mounted film to be detected and winding and unwinding, an environmental simulation component for changing the surface temperature and humidity of the vehicle-mounted film to be detected being arranged on the detection frame, three calibration plates being mounted on the detection frame, a first visual probe and a pressure measuring plate being mounted on each calibration plate, a back frame, a load frame and a counterweight frame being arranged in sequence from bottom to top, the back frame being fixedly connected with the detection frame, a group of lifting push rods being mounted on the back frame, and the movable ends of each lifting push rod being fixedly connected with the counterweight frame. The device is provided with multiple rotating frames on the load frame, different pencils with different hardness parameters are mounted on different rotating frames, and different pencils with different hardness can be used to synchronously detect the vehicle-mounted film in single detection, so that detection data under multiple groups of different hardness conditions can be quickly obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle-mounted film detection, in particular to a hardness detection device for vehicle-mounted film and a detection method thereof. BACKGROUND

[0002] Vehicle-mounted film is a kind of film material specially used for automobile window glass, which is usually composed of multiple layers such as polyester substrate, adhesive layer, wear-resistant layer, etc. It has multiple functions such as heat insulation, sun protection, explosion protection, ultraviolet protection, privacy protection, etc., which can improve the comfort and safety of the vehicle, and also helps to protect the interior of the vehicle and prolong its service life. The vehicle-mounted film needs to be detected for hardness before being applied to the factory, and in the prior art, various types of film hardness detection devices have appeared, such as the patent document with publication number CN212748604U which discloses a paint film hardness testing device. The above device detects the line detection of the detected piece on the base through the detection pen assembly, and the force of the detection pen assembly does not change and the speed remains consistent during the sliding process of the detection pen assembly, thereby making the test result more accurate. However, the above device has the following technical problems when in use:

[0003] 1. It is not convenient to implement repeated tests;

[0004] 2. The efficiency of obtaining multiple sets of different hardness detection data is low: the existing technology can usually detect the hardness of vehicle-mounted film under only one hardness condition at a time, and if multiple sets of detection data of different hardness are to be obtained, the detection tool needs to be replaced multiple times and the detection parameters need to be reset, which is a tedious operation process and consumes a lot of time;

[0005] 3. It is inconvenient to replace the pencil: when using a pencil to detect the hardness of vehicle-mounted film, the existing equipment lacks a convenient pencil replacement mechanism, and once the pencil is worn out during the detection process, it needs to be manually stopped;

[0006] 4. It is not convenient to implement pencil load pre-calibration and pre-checking, and it is not convenient to dynamically adjust the pencil load;

[0007] 5. It is not convenient to explore the influence of tension and temperature and humidity on the hardness of vehicle-mounted film: the existing detection technology is not convenient to implement the research on the influence of tension and temperature and humidity parameters on the hardness of vehicle-mounted film during the experiment of the vehicle-mounted film to be tested;

[0008] Therefore, the present application provides a hardness detection device for vehicle-mounted film and a detection method thereof to solve the problems raised in the background art. SUMMARY

[0009] The purpose of the present application is to provide a hardness detection device for vehicle-mounted film and a detection method thereof, which solves the technical problems of the existing device in the background art. The present application provides the following technical solutions:

[0010] A hardness detection device of a vehicle-mounted film, comprising a detection frame capable of linear displacement, and further comprising:

[0011] A winding mechanism mounted on the detection frame, the winding mechanism being used for setting tension parameters of the vehicle-mounted film to be tested and winding and unwinding, the detection frame being provided with environmental simulation components for changing surface temperature and humidity of the vehicle-mounted film to be tested, and the detection frame being mounted with three calibration plates, each of which is mounted with a first visual probe and a pressure measuring plate;

[0012] A back frame, a load frame and a counterweight frame being sequentially arranged from bottom to top, the back frame being fixedly connected with the detection frame, the back frame being mounted with a group of lifting push rods, the movable ends of each lifting push rod being fixedly connected with the counterweight frame, each lifting push rod being mounted with a second pressure sensor, the load frame being movable between the second pressure sensor and the counterweight frame, and a dynamic counterweight mechanism being mounted between the counterweight frame and the load frame for changing the counterweight of the load frame;

[0013] The load frame is mounted with four calibration plungers, and each position between two calibration plungers on the load frame is rotatably mounted with a rotatable rotating frame, each rotating frame is hingedly connected with a group of stress plates, each stress plate is mounted with a stress sensor between the stress plate and the rotating frame, and each stress plate is mounted with a pencil, the pencil hardness parameters on the same rotating frame are consistent, and the pencil hardness parameters on different rotating frames are different;

[0014] A visual detection assembly is used for image pre-acquisition before testing of the vehicle-mounted film to be tested and image re-acquisition after testing of the vehicle-mounted film to be tested.

[0015] Preferably, the device further comprises a base, the base is fixedly mounted with two guide rails, the two guide rails are slidably connected with the detection frame, an electric linear actuator is mounted between the base and the detection frame, the electric linear actuator is built-in with an encoder for controlling displacement stroke and displacement speed of the detection frame, an end surface of the detection frame is mounted with a PLC controller, and data terminals of the stress sensors and the second pressure sensors are in data connection with the PLC controller.

[0016] Preferably, the winding mechanism comprises a force measuring seat, the force measuring seat is slidably connected with the detection frame, a group of first pressure sensors are mounted between the force measuring seat and the detection frame, data terminals of the first pressure sensors are in data connection with the PLC controller, two film rollers are rotatably mounted between the force measuring seat and the inner surface of the detection frame, two ends of the vehicle-mounted film to be tested are fixedly mounted on the two film rollers, respectively, two guide rollers are rotatably connected between the inner surfaces of the detection frame, the two guide rollers are in contact with the vehicle-mounted film to be tested, respectively, two winding motors are mounted on the side surface of the detection frame, and output shaft ends of the two winding motors are fixedly connected with the two film rollers, respectively.

[0017] Preferably, the environment simulation component comprises a simulation table mounted on the detection frame, a temperature simulator is mounted inside the simulation table, the temperature simulation range of the temperature simulator is -15℃-100℃, a humidifier is mounted on the detection frame, the humidifier is opposite to the to-be-tested vehicle-mounted film, and the control ports of the temperature simulator and the humidifier are connected with the PLC controller.

[0018] Preferably, a guide column is mounted at the top end of each lifting push rod and above the corresponding second pressure sensor, the top end of each guide column is fixedly connected with the counterweight frame, and a guide sleeve that is in sliding fit with the guide column is mounted on the detection frame and at the position corresponding to each guide column.

[0019] Preferably, the dynamic counterweight mechanism comprises a set of counterweight masses mounted on the detection frame, two permanent magnets are mounted on the detection frame, electromagnets are fixedly mounted on the counterweight frame and opposite to the two permanent magnets, and repulsive force is generated between the electromagnets and the permanent magnets after the electromagnets are electrified.

[0020] Preferably, a translocation motor is mounted on the side surface of the load frame, a translocation shaft is fixedly mounted at the output shaft end of the translocation motor, three belts are drivingly connected to the translocation shaft, and the three belts are drivingly connected with the three rotating frames, respectively.

[0021] Preferably, when the pencil is rotated to be directly above the to-be-tested vehicle-mounted film, the pencil is arranged at an angle of 45° with the to-be-tested vehicle-mounted film, the calibration punch rod is arranged perpendicularly to the horizontal plane, the calibration punch rod is internally provided with color ink pens and can perform color marking on the to-be-tested vehicle-mounted film, and the marking colors of the multiple color ink pens are different.

[0022] Preferably, the visual detection assembly comprises two second visual probes mounted on the detection frame, the two second visual probes are arranged above the to-be-tested vehicle-mounted film, the collection ends of the two second visual probes are opposite to the to-be-tested vehicle-mounted film, the PLC controller is internally provided with an image recognition module, and the data ends of the two second visual probes are connected with the image recognition module in data.

[0023] Preferably, a detection method of a hardness detection device of a vehicle-mounted film comprises the following steps:

[0024] SS1, device preparation: check whether each component of the device is normally operated, ensure that the temperature simulator, the humidifier, the stress sensor, the second pressure sensor, the visual collection sensor and the like can normally work, install the to-be-tested vehicle-mounted film on the winding mechanism, read the data of the first pressure sensor through the PLC controller, adjust the distance between the film rollers according to the material properties and the detection standard of the to-be-tested vehicle-mounted film, accurately set the tensioning parameters of the to-be-tested vehicle-mounted film, and make the to-be-tested vehicle-mounted film reach the set tensioning degree;

[0025] SS2, environmental simulation setting: according to the requirements of the actual use environment of the vehicle-mounted film to be tested, the temperature simulator and the humidifier are controlled by the PLC controller to set the temperature and humidity of the surface of the vehicle-mounted film to be tested;

[0026] SS3, load calibration: before testing, the three pencils on the rotating frames are rotated to be directly above the vehicle-mounted film to be tested, and are arranged at an angle of 45° with the vehicle-mounted film to be tested. The three pressure measuring plates are moved to be directly above the corresponding pencils. The pencils act on the pressure measuring plates, and the load frame is limited by the pressure measuring plates. By setting the height of the lifting push rod and the pressure load, the relative positions of the second pressure sensor and the load frame and the relative positions of the load frame and the counterweight frame are adjusted. Meanwhile, the current size of the electromagnet is set. The dynamic counterweight mechanism is used to adjust the load frame counterweight, so that the three pencils can reach the preset load before setting. The load calibration before testing is completed, and the parameters of the lifting push rod and the electromagnet after calibration are recorded;

[0027] SS4, pencil state detection: after the preset load calibration, the three first visual probes are moved to be directly below the three pencils to be used, and the images of the pencil tips are collected. Through image collection, it is detected whether the pencil tip meets the requirements of the pencil hardness test method. If the pencil tip does not meet the requirements, the pencil should be replaced in time;

[0028] SS5, scratch detection: after the preset load calibration and confirmation that the pencil state meets the requirements, the pencil on the stress plate is rotated with the rotating frame to be at an angle of 45° with the vehicle-mounted film to be tested. The electric linear actuator is started to move the test frame and the vehicle-mounted film to be tested relative to the pencil for scratching detection. During the scratching process, the stress sensor monitors the scratching stress changes in real time and transmits the data to the PLC controller. According to the stress parameter changes of the stress sensor, the PLC controller detects the end wear degree of the pencil during the detection. When the feedback value of the stress sensor reaches the set threshold value, the index motor drives the index shaft to rotate, so that a new pencil that has not been used moves to the test position. The automatic wear detection and automatic replacement of the pencil are completed, so that the pencil hardness scratch detection on the vehicle-mounted film to be tested can be repeated, and multiple sets of detection data can be obtained;

[0029] SS6, image acquisition and analysis: before testing, the second visual probe pre-collects images of the vehicle-mounted film to be tested, obtains image information of the initial state of the vehicle-mounted film to be tested, and transmits the image data to the image recognition module in the PLC controller for storage. After testing, the images of the vehicle-mounted film to be tested are collected again. The image recognition module compares the images before and after testing, analyzes the scratch conditions and color mark changes on the surface of the vehicle-mounted film to be tested, and determines the hardness grade of the vehicle-mounted film to be tested by comparing the length, width and depth parameters of the scratches;

[0030] SS7, impact resistance hardness test: when the impact resistance hardness test of the vehicle-mounted film to be tested is needed, the weight of the detection frame and the calibration impact rod is adjusted, so that the detection frame and the calibration impact rod impact the vehicle-mounted film to be tested with the set weight, and the hardness of the vehicle-mounted film to be tested under different impact intensities is detected.

[0031] Compared with the prior art, the application has the following beneficial effects:

[0032] 1、The device of the application is provided with multiple rotating frames on the load frame, and pencils with different hardness parameters are installed on different rotating frames, so that the vehicle-mounted film can be detected synchronously by pencils with different hardness in a single detection, and multiple sets of detection data under different hardness conditions can be quickly obtained, while the prior art can only detect the hardness of the vehicle-mounted film under one hardness condition at a time, and multiple sets of data can be obtained by multiple replacement of detection tools and re-setting of detection parameters, which is complicated and time-consuming, and the application greatly improves the detection efficiency and reduces the detection time and workload.

[0033] 2、In the detection process, the stress sensor monitors the stress change of the pencil when it rubs the vehicle-mounted film in real time, and when the feedback value of the stress sensor reaches the set threshold value, it indicates that the end of the pencil is worn out, at this time, the indexing motor drives the indexing shaft to rotate, and automatically moves the unused new pencil to the test position, to complete the automatic wear detection and automatic replacement of the pencil, which avoids the trouble of manual stopping and replacing the pencil in the prior art once the pencil is worn out, ensures the continuity of the detection process, improves the detection efficiency, reduces the manual intervention and reduces the human error.

[0034] 3、The application is convenient for realizing the pre-calibration, pre-checking and dynamic adjustment of the pencil load, before detection, by adjusting the height and pressure load of the lifting push rod, combining with the dynamic weight mechanism to set the size of the current of the electromagnet, the pencil can reach the preset load before setting, the load calibration is completed, and the parameters after calibration are recorded, so that the pencil can contact the vehicle-mounted film with the set load during detection, and at the same time, the first visual probe is used to collect the image of the pencil tip to detect whether the pencil tip meets the requirements of the hardness test method, and when different thickness vehicle-mounted films are detected, the dynamic weight mechanism can be flexibly adjusted to realize the dynamic adjustment of the pencil load, and the prior art lacks a convenient pencil load pre-calibration and pre-checking mechanism, and it is also difficult to perform dynamic adjustment.

[0035] 4、The application is convenient to explore the influence of tension and temperature and humidity on the hardness of the vehicle-mounted film, the first pressure sensor in the winding mechanism cooperates with the PLC controller, the tension parameters of the vehicle-mounted film can be accurately set according to the material characteristics and detection standards of the vehicle-mounted film, the vehicle-mounted film reaches the appropriate tension by adjusting the distance of the film roller, and the winding and unwinding operation is facilitated, the environmental simulation component can set and maintain the temperature and humidity of the surface of the vehicle-mounted film by controlling the temperature simulator and the humidifier through the PLC controller according to the actual use environment demand of the vehicle-mounted film, which enables the application to study the influence of different tension and temperature and humidity conditions on the hardness of the vehicle-mounted film, and the prior art cannot effectively simulate these environmental factors for detection.

[0036] 5、The application is convenient to realize repeated tests, the equipment structure is reasonably designed, the components work cooperatively, the detection process is clear and easy to operate, the equipment can be conveniently reset and adjusted after each detection, such as replacing a new vehicle-mounted film to be detected, resetting the detection parameters, etc., and the next detection test can be quickly performed, and the detection device in the prior art is inconvenient in repeated tests, complex in operation and low in efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is a structural schematic view of a vehicle-mounted film hardness detection equipment;

[0038] Figure 2 It is Figure 1 It is a structural schematic view of another angle;

[0039] Figure 3 It is a structural schematic view of a vehicle-mounted film to be detected and a calibration plate;

[0040] Figure 4 It is a structural schematic view of a simulation table and a guide roller;

[0041] Figure 5 It is a structural schematic view of an indexing shaft and a load frame;

[0042] Figure 6 It is a structural schematic view of an electromagnet and a guide column;

[0043] Figure 7 It is a structural schematic view of a counterweight and a calibration ram;

[0044] Figure 8 It is a structural schematic view of an indexing shaft and a load frame;

[0045] Figure 9 It is Figure 8 It is a local enlarged structural schematic view of A in the middle.

[0046] Wherein: 1, detection frame; 2, to be measured vehicle-mounted film; 3, calibration plate; 4, first visual probe; 5, pressure measuring plate; 6, back frame; 7, load frame; 8, counterweight frame; 9, lifting push rod; 10, winding motor; 11, calibration punch; 12, rotating frame; 13, stress plate; 14, stress sensor; 15, pencil; 16, base; 17, electric linear actuator; 18, PLC controller; 19, force measuring seat; 20, first pressure sensor; 21, film roller; 22, guide roller; 23, simulation table; 24, temperature simulator; 25, humidifier; 26, second pressure sensor; 27, counterweight weight; 28, permanent magnet; 29, electromagnet; 30, indexing motor; 31, indexing shaft; 32, second visual probe; 33, guide column. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0048] Please refer to Figures 1-9 A hardness detection device for vehicle-mounted film comprises a detection frame 1 that can be linearly displaced, and a base 16, two guide rails are fixedly installed on the base 16, both the guide rails are in sliding connection with the detection frame 1, an electric linear actuator 17 is installed between the base 16 and the detection frame 1, the electric linear actuator 17 is built-in with an encoder for controlling the displacement stroke and speed of the detection frame 1, and a PLC controller 18 is installed on the end face of the detection frame 1;

[0049] During the detection process, the guide rails on the base 16 are in sliding connection with the detection frame 1, thereby providing a stable guiding action for the linear displacement of the detection frame 1;

[0050] The built-in encoder of the electric linear actuator 17 can accurately control the displacement stroke and speed of the detection frame 1, thereby meeting the requirements for the detection position and moving speed in different detection scenarios;

[0051] The PLC controller 18 installed on the end face of the detection frame 1 serves as a control core, can receive data of the stress sensor 14 and the second pressure sensor 26, and is convenient for unified management and analysis of the detection data, thereby realizing automatic control of the device, improving the accuracy and efficiency of the detection, and reducing human errors, and further comprising:

[0052] A winding mechanism is installed on the detection frame 1, the to-be-measured vehicle-mounted film 2 is wound on the winding mechanism, and the winding mechanism is used for setting the tensioning parameters of the to-be-measured vehicle-mounted film 2 and winding and unwinding;

[0053] The winding mechanism comprises a load cell 19 in sliding connection with the detection frame 1, a set of first pressure sensors 20 are installed between the load cell 19 and the detection frame 1, the data end of the first pressure sensor 20 is in data connection with the PLC controller 18, two film rollers 21 are rotatably installed between the inner surfaces of the load cell 19 and the detection frame 1, the two ends of the vehicle-mounted film 2 to be tested are fixedly installed on the two film rollers 21 respectively, two guide rollers 22 are rotatably connected between the inner surfaces of the detection frame 1, the two guide rollers 22 are in contact with the vehicle-mounted film 2 to be tested, two winding motors 10 are installed on the side surface of the detection frame 1, and the output shaft ends of the two winding motors 10 are fixedly connected with the two film rollers 21 respectively.

[0054] Before detection, the data of the first pressure sensor 20 is read by the PLC controller 18, so that the tensioning parameters of the vehicle-mounted film 2 to be tested can be accurately set;

[0055] According to the material characteristics and detection standards of the vehicle-mounted film 2 to be tested, the distance between the film rollers 21 is adjusted to make the vehicle-mounted film 2 to be tested reach a suitable tensioning degree;

[0056] During the detection process, when the detection area needs to be replaced or detection under different working conditions is needed, the winding mechanism can conveniently wind and unwind the vehicle-mounted film 2 to be tested;

[0057] The two guide rollers 22 are in contact with the vehicle-mounted film 2 to be tested, which ensures the stability of the vehicle-mounted film 2 to be tested during winding and unwinding, avoids problems such as deviation or wrinkling, solves the problems that the tensioning degree of the vehicle-mounted film 2 to be tested is difficult to accurately control and winding and unwinding are inconvenient in the prior art, and improves the accuracy and reliability of detection;

[0058] The detection frame 1 is provided with an environment simulation component for changing the surface temperature and humidity of the vehicle-mounted film 2 to be tested, three calibration plates 3 are installed on the detection frame 1, and a first visual probe 4 and a pressure measuring plate 5 are installed on each calibration plate 3;

[0059] The environment simulation component comprises a simulation table 23 installed on the detection frame 1, a temperature simulator 24 is installed in the simulation table 23, the temperature simulation range of the temperature simulator 24 is -15℃-100℃, a humidifier 25 is installed on the detection frame 1, the humidifier 25 is opposite to the vehicle-mounted film 2 to be tested, and the control ports of the temperature simulator 24 and the humidifier 25 are in data connection with the PLC controller 18;

[0060] Before detection, the temperature simulator 24 and the humidifier 25 can be controlled by the PLC controller 18 according to the requirements of the actual use environment of the vehicle-mounted film 2 to be tested to set the temperature and humidity of the surface of the vehicle-mounted film 2 to be tested;

[0061] When simulating the high-temperature exposure environment of the vehicle-mounted film 2 to be tested, the temperature simulator 24 is heated to a specified high-temperature exposure temperature, and the humidifier 25 is controlled to adjust the humidity;

[0062] During the detection process, the temperature simulator 24 and the humidifier 25 continuously work to keep the surface temperature and humidity of the to-be-detected vehicle film 2 stable;

[0063] This solves the problem in the prior art that the actual use environment of the to-be-detected vehicle film 2 cannot be simulated for hardness detection, so that the detection result is more in line with the real situation of the to-be-detected vehicle film 2 in actual use, provides strong support for evaluating the performance of the to-be-detected vehicle film 2 under different temperature and humidity environments, and improves the practicality and reference value of the detection result;

[0064] The back frame 6, the load frame 7 and the counterweight frame 8 are arranged from bottom to top, the back frame 6 is fixedly connected with the detection frame 1, a group of lifting push rods 9 are installed on the back frame 6, the movable end of each lifting push rod 9 is fixedly connected with the counterweight frame 8, a second pressure sensor 26 is installed on each lifting push rod 9, the load frame 7 is movable between the second pressure sensor 26 and the counterweight frame 8, and a dynamic counterweight mechanism for changing the counterweight size of the load frame 7 is installed between the counterweight frame 8 and the load frame 7;

[0065] A guide column 33 is installed at the top end of each lifting push rod 9 and at a position corresponding to the upper side of the second pressure sensor 26, the top end of each guide column 33 is fixedly connected with the counterweight frame 8, and a guide sleeve that is in sliding fit with the guide column 33 is installed on the detection frame 1 and at a position corresponding to each guide column 33;

[0066] Four calibration impact rods 11 are installed on the load frame 7, and a rotatable rotating frame 12 is rotatably installed on the load frame 7 and at a position corresponding to the space between two calibration impact rods 11;

[0067] A transposition motor 30 is installed on the side surface of the load frame 7, a transposition shaft 31 is fixedly installed at the output shaft end of the transposition motor 30, and three belts are drivingly connected with the three rotating frames 12;

[0068] A group of stress plates 13 are hingedly connected to each rotating frame 12, a stress sensor 14 is installed between each stress plate 13 and the rotating frame 12, and a pencil 15 is installed on each stress plate 13;

[0069] The hardness of the pencil 15 meets the ASTM D3363 standard;

[0070] The hardness parameters of the pencils 15 on the same rotating frame 12 are consistent, and the hardness parameters of the pencils 15 on different rotating frames 12 are different;

[0071] Through the different hardness parameters of the pencils 15 on different rotating frames 12, the detection data under different hardness pencils 15 can be quickly and synchronously obtained during single detection, and the detection efficiency is effectively improved;

[0072] The data terminals of the stress sensor 14 and the second pressure sensor 26 are connected with the PLC controller 18;

[0073] The dynamic counterweight mechanism comprises a set of counterweight weights 27 installed on the detection frame 1, two permanent magnets 28 installed on the detection frame 1, and electromagnets 29 fixedly installed on the counterweight frame 8 and opposite to the positions of the two permanent magnets 28, and the repulsion force between the electromagnets 29 and the permanent magnets 28 is generated after the electromagnets 29 are electrified;

[0074] Before detection, a proper number of counterweight weights 27 can be installed according to the detection requirements, and during detection, the electrification of the electromagnets 29 can be controlled to accurately and dynamically adjust the counterweight size of the load frame 7 by using the repulsion force between the electromagnets 29 and the permanent magnets 28;

[0075] The standard load during testing is different for the vehicle-mounted films 2 with different thicknesses;

[0076] The dynamic counterweight mechanism can be used to flexibly adjust the counterweight size when the device tests the vehicle-mounted films 2 with different thicknesses;

[0077] During the detection process, the lifting push rod 9 works to push the counterweight frame 8 to rise or fall, thereby driving the load frame 7 to move;

[0078] The second pressure sensor 26 can monitor the pressure borne by the lifting push rod 9 in real time to provide data support for detection;

[0079] The cooperation of the guide column 33 and the guide sleeve ensures the stability and accuracy of the load frame 7 during movement, avoiding shaking or deviation;

[0080] Before testing, the three pencils 15 on the three rotating frames 12 are rotated to be above the vehicle-mounted film 2 to be tested and are arranged at an angle of 45° with the vehicle-mounted film 2 to be tested, and the three pressure measuring plates 5 are moved to be above the three pencils 15, respectively, the pencils 15 act on the pressure measuring plates 5, the load frame 7 is limited by the pressure measuring plates 5, the relative positions of the second pressure sensor 26 and the load frame 7 and the relative positions of the load frame 7 and the counterweight frame 8 are adjusted by setting the height of the lifting push rod 9 and the pressure load, and the current size of the electromagnet is set, so that the three pencils 15 can reach the preset load before testing, thereby completing the load calibration before testing;

[0081] After the preset load calibration, the parameters of the lifting push rod 9 and the electromagnet under the calibration adjustment are recorded, and then the pencils 15 can contact the vehicle-mounted film 2 to be tested at the set load and perform the scratch experiment on the vehicle-mounted film 2 to be tested during the detection mode;

[0082] After the preset load is calibrated, the three first visual probes 4 are respectively moved to the directly below of the three to-be-used pencils 15, and the three first visual probes 4 are respectively used for image acquisition of the tip part of the three to-be-used pencils 15, so as to detect whether the pencil tip of the pencil 15 meets the requirements of the pencil hardness test method before the detection mode is carried out through the image acquisition;

[0083] When the pencil 15 is rotated to the directly above of the to-be-tested vehicle-mounted film 2 and is arranged at 45° with the to-be-tested vehicle-mounted film 2, the calibration punch rod 11 is arranged vertically to the horizontal plane, the calibration punch rod 11 is internally provided with color markers and can perform color marking on the to-be-tested vehicle-mounted film 2, and the marking colors of the multiple color markers are different;

[0084] In the detection process, the pencil 15 on the stress plate 13 is rotated to the directly above of the to-be-tested vehicle-mounted film 2 and is arranged vertically to the to-be-tested vehicle-mounted film 2 through the rotating frame 12, the marking end of the calibration punch rod 11 is attached to the to-be-tested vehicle-mounted film 2 and performs color marking on the to-be-tested vehicle-mounted film 2;

[0085] When the to-be-tested vehicle-mounted film 2 moves relative to the pencil 15 and the to-be-tested vehicle-mounted film 2 performs the scratching detection, the stress sensor 14 monitors the stress change in the scratching process in real time and transmits the data to the PLC controller 18;

[0086] The PLC controller 18 detects the end wear degree of the pencil 15 during the detection according to the stress parameter change of the stress sensor 14, when the feedback value of the stress sensor 14 reaches the set threshold value, a new pencil 15 that is not used is moved to the test position through the rotating motor 30 driving the rotating shaft 31 to rotate, so as to complete the automatic wear detection of the pencil 15 and the automatic replacement of the pencil 15, so as to repeatedly perform the pencil hardness scratching detection on the to-be-tested vehicle-mounted film 2, and then multiple sets of detection data are obtained, so as to improve the accuracy and reliability of the detection result;

[0087] The different color markings of the multiple calibration punch rods 11 facilitate the second visual probe 32 to distinguish different detection areas and detection results;

[0088] The calibration punch rod 11 is vertically to the horizontal plane and is internally provided with different color markers, and can perform color marking on the to-be-tested vehicle-mounted film 2;

[0089] This solves the problems of single detection process, inability of multi-dimensional detection and difficulty in distinguishing the detection results in the prior art, realizes multi-dimensional and accurate detection of the hardness of the to-be-tested vehicle-mounted film 2, and improves the detection efficiency and readability of the detection result;

[0090] When the impact resistance hardness test needs to be performed on the to-be-tested vehicle-mounted film 2, the detection frame 1 and the calibration punch rod 11 perform instantaneous impact on the to-be-tested vehicle-mounted film 2 with the set weight, and then the hardness of the to-be-tested vehicle-mounted film 2 under different impact strengths is detected;

[0091] The color ink pen is made of impact-resistant material, and should be replaced in time when it is damaged;

[0092] A visual detection assembly is arranged above the to-be-tested car film 2 and collects images of the to-be-tested car film 2 before and after testing.

[0093] The visual detection assembly includes two second visual probes 32 mounted on the detection frame 1, and the two second visual probes 32 are arranged above the to-be-tested car film 2, and the collecting ends of the two second visual probes 32 are opposite to the to-be-tested car film 2. The PLC controller 18 is provided with an image recognition module, and the data ends of the two second visual probes 32 are connected to the image recognition module.

[0094] The image recognition module analyzes the scratch parameters based on an OpenCV algorithm;

[0095] Before testing, the second visual probe 32 collects images of the to-be-tested car film 2, obtains image information of the initial state of the to-be-tested car film 2, and transmits the image data to the image recognition module in the PLC controller 18 for storage;

[0096] After testing, the images of the to-be-tested car film 2 are collected again, the image recognition module compares the images before and after testing, analyzes the scratch conditions and color mark changes on the surface of the to-be-tested car film 2, and thus judges the hardness performance of the to-be-tested car film 2;

[0097] By comparing the length, width and depth of the scratch and other parameters, the hardness grade of the to-be-tested car film 2 is determined;

[0098] This solves the problem that the detection result in the prior art depends on subjective judgment of a person and has low accuracy, and the image recognition technology is used to realize objective and accurate analysis of the detection result, and the automation level of detection and the reliability of the detection result are improved;

[0099] The first visual probe 14 and the second visual probe 32 are industrial-grade CCD cameras with a resolution of 20 million pixels;

[0100] A detection method of a hardness detection device of a car film includes the following steps:

[0101] SS1, device preparation: check whether each component of the device is normally operated, ensure that the temperature simulator 24, the humidifier 25, the stress sensor 14, the second pressure sensor 26, the visual collection sensor and the like can normally work, install the to-be-tested car film 2 on the winding mechanism, read the data of the first pressure sensor 20 through the PLC controller 18, adjust the distance between the film rollers 21 according to the material characteristics and detection standard of the to-be-tested car film 2, accurately set the tensioning parameters of the to-be-tested car film 2, and make the to-be-tested car film 2 reach the set tensioning degree;

[0102] SS2, environmental simulation setting: according to the requirements of the actual use environment of the vehicle-mounted film 2 to be tested, the temperature simulator 24 and the humidifier 25 are controlled by the PLC controller 18 to set the temperature and humidity of the surface of the vehicle-mounted film 2 to be tested;

[0103] SS3, load calibration: before testing, the three pencils 15 on the three rotating frames 12 are rotated to be directly above the vehicle-mounted film 2 to be tested, and are arranged at an angle of 45° with the vehicle-mounted film 2 to be tested, and the three pressure measuring plates 5 are moved to be directly above the corresponding pencils 15, the pencils 15 act on the pressure measuring plates 5, the load frame 7 is limited by the pressure measuring plates 5, by setting the height of the lifting push rod 9 and the pressure load, the relative positions of the second pressure sensor 26 and the load frame 7 and the relative positions of the load frame 7 and the counterweight frame 8 are adjusted, and the current of the electromagnet is set, the dynamic counterweight mechanism is used to adjust the counterweight of the load frame 7, so that the three pencils 15 can reach the preset load before setting, the load calibration before testing is completed, and the parameters of the lifting push rod 9 and the electromagnet after calibration are recorded;

[0104] SS4, pencil state detection: after preset load calibration, the three first visual probes 4 are moved to be directly below the three pencils 15 to be used, the images of the tip parts of the pencils 15 are collected, the tip of the pencil 15 is detected whether it meets the requirements of the pencil hardness test method through image collection, if the tip does not meet the requirements, the pencil 15 is replaced in time;

[0105] SS5, scratch detection: after preset load calibration and confirmation that the state of the pencil 15 meets the requirements, the pencil 15 on the stress plate 13 is rotated with the rotating frame 12 to be arranged at an angle of 45° with the vehicle-mounted film 2 to be tested, the electric linear actuator 17 is started, the detection frame 1 drives the vehicle-mounted film 2 to be tested to move relative to the pencil 15 for scratching detection, in the process of scratching, the stress sensor 14 monitors the change of scratching stress in real time, and transmits the data to the PLC controller 18, the PLC controller 18 detects the end wear degree of the pencil 15 during detection according to the stress parameter change of the stress sensor 14, when the feedback value of the stress sensor 14 reaches the set threshold value, a new pencil 15 that has not been used is moved to the test position by the rotating motor 30 driving the rotating shaft 31 to rotate, the automatic wear detection and automatic replacement of the pencil 15 are completed, so as to repeatedly perform the pencil hardness scratch detection on the vehicle-mounted film 2 to be tested, and multiple sets of detection data are obtained;

[0106] SS6, image acquisition and analysis: before detection, the second visual probe 32 pre-acquires the image of the to-be-tested vehicle-mounted film 2, obtains the image information of the initial state of the to-be-tested vehicle-mounted film 2, and transmits the image data to the image recognition module in the PLC controller 18 for storage; after detection, the image of the to-be-tested vehicle-mounted film 2 is acquired again, the image recognition module compares the images before and after detection, analyzes the scratch condition and color mark change on the surface of the to-be-tested vehicle-mounted film 2, and determines the hardness grade of the to-be-tested vehicle-mounted film 2 by comparing the length, width and depth of the scratch and other parameters.

[0107] SS7, impact resistance hardness test: when it is necessary to test the impact resistance hardness of the to-be-tested vehicle-mounted film 2, the weight of the detection frame 1 and the calibration impact rod 11 is adjusted, so that the detection frame 1 and the calibration impact rod 11 impact the to-be-tested vehicle-mounted film 2 with the set weight, and the hardness of the to-be-tested vehicle-mounted film 2 under different impact intensities is detected.

[0108] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits thereof, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A hardness detection device for a vehicle-mounted film, comprising a detection frame (1) which can be linearly displaced, characterized in that, Also include: The winding mechanism is installed on the detection frame (1), and the winding mechanism is used for tension parameter setting and winding of the measured vehicle-mounted film (2). The detection frame (1) is provided with an environment simulation component for changing the surface temperature and humidity of the measured vehicle-mounted film (2). Three calibration plates (3) are installed on the detection frame (1). Each calibration plate (3) is provided with a first visual probe (4) and a pressure measuring plate (5). From bottom to top, the back frame (6), the load frame (7) and the counterweight frame (8) are arranged in sequence. The back frame (6) is fixedly connected with the detection frame (1). A group of lifting push rods (9) are installed on the back frame (6). The movable end of each lifting push rod (9) is fixedly connected with the counterweight frame (8). A second pressure sensor (26) is installed on each lifting push rod (9). The load frame (7) is movable between the second pressure sensor (26) and the counterweight frame (8). A dynamic counterweight mechanism for changing the counterweight size of the load frame (7) is installed between the load frame (7) and the counterweight frame (8). Four calibration plungers (11) are installed on the load frame (7). A rotatable rotary frame (12) is rotatably installed on the load frame (7) and corresponds to the position between each two calibration plungers (11). A group of stress plates (13) are hingedly connected to each rotary frame (12). A stress sensor (14) is installed between each stress plate (13) and the rotary frame (12). A pencil (15) is installed on each stress plate (13). The hardness parameters of the pencils (15) on the same rotary frame (12) are consistent, and the hardness parameters of the pencils (15) on different rotary frames (12) are different. The visual detection assembly is used for image pre-acquisition before testing of the measured vehicle-mounted film (2) and image re-acquisition after testing of the measured vehicle-mounted film (2). A shift motor (30) is installed on the side surface of the load frame (7). A shift shaft (31) is fixedly installed on the output shaft end of the shift motor (30). Three belts are drivingly connected to the shift shaft (31). The three belts are drivingly connected to the three rotary frames (12). When the pencil (15) rotates to the top of the measured vehicle-mounted film (2), it is arranged at an angle of 45° with the measured vehicle-mounted film (2). The calibration plunger (11) is perpendicular to the horizontal plane. The calibration plunger (11) is provided with a color ink pen and can mark colors on the measured vehicle-mounted film (2). The marking colors of the multiple color ink pens are different.

2. The hardness detection device for a vehicle-mounted film according to claim 1, characterized by: A base (16) is further included. Two guide rails are fixedly installed on the base (16). The two guide rails are slidingly connected with the detection frame (1). An electric linear actuator (17) is installed between the base (16) and the detection frame (1). The electric linear actuator (17) is provided with an encoder for controlling the displacement stroke and displacement speed of the detection frame (1). A PLC controller (18) is installed on the end surface of the detection frame (1). The data terminals of the stress sensor (14) and the second pressure sensor (26) are data-connected with the PLC controller (18).

3. The hardness detection device for a vehicle-mounted film according to claim 2, characterized by: The winding mechanism comprises a load cell (19) which is in sliding connection with the detection frame (1), a group of first pressure sensors (20) are installed between the load cell (19) and the detection frame (1), the data end of the first pressure sensor (20) is in data connection with the PLC controller (18), two film rollers (21) are rotatably installed between the inner surfaces of the load cell (19) and the detection frame (1), the two ends of the vehicle-mounted film to be measured (2) are fixedly installed on the two film rollers (21) respectively, two guide rollers (22) are rotatably connected between the inner surfaces of the detection frame (1), the two guide rollers (22) are in contact with the vehicle-mounted film to be measured (2), two winding motors (10) are installed on the side surface of the detection frame (1), the output shaft ends of the two winding motors (10) are fixedly connected with the two film rollers (21) respectively.

4. The hardness detection device for a film for a vehicle according to claim 3, characterized by: The environmental simulation component comprises a simulation table (23) installed on the detection frame (1), a temperature simulator (24) is installed in the simulation table (23), the temperature simulation range of the temperature simulator (24) is -15℃-100℃, a humidifier (25) is installed on the detection frame (1), the humidifier (25) is opposite to the vehicle-mounted film to be measured (2), the control ports of the temperature simulator (24) and the humidifier (25) are in data connection with the PLC controller (18).

5. The hardness detection device for a film installed in a vehicle according to claim 1, characterized by: The top end of each lifting push rod (9) is provided with a guide column (33) corresponding to the position above the second pressure sensor (26), the top end of each guide column (33) is fixedly connected with the counterweight frame (8), and a guide sleeve in sliding cooperation with the guide column (33) is installed on the detection frame (1) and corresponds to the position of each guide column (33).

6. The hardness detection device for a film installed in a vehicle according to claim 1, characterized by: The dynamic counterweight mechanism comprises a group of counterweight weights (27) installed on the detection frame (1), two permanent magnets (28) are installed on the detection frame (1), and an electromagnet (29) is fixedly installed on the counterweight frame (8) and opposite to the two permanent magnets (28), and repulsive force is generated between the electromagnet (29) and the permanent magnet (28) after the electromagnet (29) is energized.

7. The hardness detection device for a film installed in a vehicle according to claim 4, characterized by: The visual detection assembly comprises two second visual probes (32) installed on the detection frame (1), the two second visual probes (32) are arranged above the vehicle-mounted film to be measured (2), the collection ends of the two second visual probes (32) are opposite to the vehicle-mounted film to be measured (2), the PLC controller (18) is provided with an image recognition module, and the data ends of the two second visual probes (32) are in data connection with the image recognition module.

8. The method of claim 7, wherein the method further comprises: The method comprises the following steps: SS1, device preparation: check whether each part of the device is running normally, ensure that the temperature simulator (24), humidifier (25), stress sensor (14), second pressure sensor (26), visual acquisition sensor, etc. can work normally, install the vehicle-mounted film (2) to be tested on the winding mechanism, read the data of the first pressure sensor (20) through the PLC controller (18), adjust the distance between the film rollers (21) according to the material characteristics and detection standards of the vehicle-mounted film (2) to be tested, accurately set the tension parameters of the vehicle-mounted film (2) to be tested, and make the vehicle-mounted film (2) to be tested reach the set tension degree; SS2, environmental simulation setting: according to the requirements of the actual use environment of the vehicle-mounted film (2) to be tested, set the temperature and humidity of the surface of the vehicle-mounted film (2) to be tested through the PLC controller (18) to control the temperature simulator (24) and the humidifier (25); SS3, load calibration: before testing, rotate the three pencils (15) on the three rotating frames (12) to be above the vehicle-mounted film (2) to be tested, so that they are arranged at 45° with the vehicle-mounted film (2) to be tested, and the three pressure measuring plates (5) are respectively moved to the upper of the corresponding pencils (15), the pencils (15) act on the pressure measuring plates (5), the load frame (7) is limited by the pressure measuring plates (5), by setting the height of the lifting push rod (9) and the pressure load, adjusting the relative position of the second pressure sensor (26) and the load frame (7) and the relative position of the load frame (7) and the counterweight frame (8), and setting the current size of the electromagnet, adjusting the counterweight of the load frame (7) by using the dynamic counterweight mechanism, so that the three pencils (15) can reach the preset load before setting, completing the load calibration work before testing, recording the parameters of the lifting push rod (9) and the electromagnet after calibration; SS4, pencil state detection: after preset load calibration, the three first visual probes (4) are respectively moved to the lower of the three to be used pencils (15), the image of the end part of the pencil (15) is collected, through image acquisition, the pencil tip of the pencil (15) is detected whether it meets the requirements of the pencil hardness test method, if the pencil tip does not meet the requirements, replace the pencil (15) in time; SS5, scratch detection: after the preset load calibration and the confirmation that the state of the pencil (15) meets the requirements, the pencil (15) on the stress plate (13) rotates with the rotating frame (12) to be arranged at 45° with the to-be-tested vehicle-mounted film (2), the electric linear actuator (17) is started, the detection frame (1) drives the to-be-tested vehicle-mounted film (2) to move relative to the pencil (15) to perform scratch detection, in the scratch process, the stress sensor (14) monitors the scratch stress change in real time and transmits the data to the PLC controller (18), the PLC controller (18) detects the end wear degree of the pencil (15) during detection according to the stress parameter change of the stress sensor (14), when the feedback value of the stress sensor (14) reaches the set threshold value, the rotating motor (30) drives the rotating shaft (31) to rotate, so that a new pencil (15) that is not used is moved to the test position, the automatic wear detection and automatic replacement of the pencil (15) are completed, so as to repeatedly perform the pencil (15) hardness scratch detection on the to-be-tested vehicle-mounted film (2) to obtain multiple sets of detection data; SS6, image acquisition and analysis: before detection, the second visual probe (32) performs image pre-acquisition on the to-be-tested vehicle-mounted film (2), obtains image information of the initial state of the to-be-tested vehicle-mounted film (2), and transmits the image data to the image recognition module in the PLC controller (18) for storage, after detection, the image of the to-be-tested vehicle-mounted film (2) is acquired again, the image recognition module compares the images before and after detection, analyzes the scratch condition and color mark change of the surface of the to-be-tested vehicle-mounted film (2), and determines the hardness grade of the to-be-tested vehicle-mounted film (2) by comparing the length, width and depth of the scratch and other parameters; SS7, impact resistance hardness test: when the impact resistance hardness test of the to-be-tested vehicle-mounted film (2) is needed, the counterweight of the detection frame (1) and the calibration impact rod (11) is adjusted, so that the detection frame (1) and the calibration impact rod (11) impact the to-be-tested vehicle-mounted film (2) with a set counterweight, and the hardness of the to-be-tested vehicle-mounted film (2) under different impact strengths is detected.

Images