Device and method for detecting polyester heat-shrinkable tube for battery

Abstract

The invention discloses a detection device and method for a polyester heat shrink tube for a battery, and the device comprises a rotating disc mechanism, the rotating disc mechanism comprises a glass rotating disc, and a hot air nozzle mechanism, a ball ejection mechanism and a first visual detection mechanism are sequentially arranged in the circumferential direction of the rotating disc mechanism; the hot air nozzle mechanism comprises a heating assembly, the heating assembly is provided with a heating nozzle, the ball ejection mechanism comprises a ball circulation assembly, one end of the ball circulation assembly is provided with a nozzle assembly, and the first visual detection mechanism comprises a first area light source arranged below the glass rotary table and a first camera arranged above the glass rotary table. The first camera is used for performing light-transmitting image capturing on the to-be-detected heat shrink tube; the comprehensive detection of the thermal shrinkage performance, the mechanical strength and the internal quality of the polyester heat shrink tube for the battery is realized through three testing means of hot air heating, ball impact and light-transmitting visual detection, and the improvement of the product quality control level is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of detection technology, and in particular to a detection device and method for a polyester heat shrink tube for a battery. Background Art

[0002] With the rapid development of electric vehicles and renewable energy storage systems, the demand for energy storage batteries continues to grow. Polyester (PET) heat shrink tubing has become an important material for battery external protection due to its excellent mechanical properties, electrical insulation properties and heat resistance. When the PET heat shrink tubing is heated, it shrinks evenly and fits tightly to the surface of the battery, playing a role in preventing dust, moisture, corrosion and mechanical damage, thereby extending the service life of the battery and improving safety and reliability. In order to ensure the stable operation of the battery in various complex environments, it is particularly important to conduct strict quality inspections on the PET heat shrink tubing used for batteries.

[0003] At present, the existing technology usually uses a visual inspection method in a high temperature environment to inspect PET heat shrink tubes for batteries. Specifically, the heat shrink tube is placed in a high temperature state to shrink, and then its appearance changes are observed visually or with a camera to determine whether there are surface defects such as bubbles, cracks, color difference, etc. However, this inspection method mainly focuses on the identification of surface defects, and it is difficult to timely and accurately detect internal defects such as uneven thickness, internal bubbles or impurities of the heat shrink tube. This single inspection method is difficult to meet the production needs for efficient and accurate quality control.

[0004] Therefore, it is necessary to improve the detection technology of PET heat shrink tube in the prior art to solve the technical problem that the detection method is single and the quality cannot be fully evaluated. Summary of the invention

[0005] The purpose of the present invention is to provide a detection device and method for polyester heat shrink tube for battery to solve the above technical problems.

[0006] To achieve this object, the present invention adopts the following technical solutions: A detection device for polyester heat shrink tube for battery, comprising a turntable mechanism, the turntable mechanism comprising a glass turntable, a drive motor and a receiving station arranged on the upper end surface of the glass turntable, the drive motor is drivingly connected to the glass turntable; A hot air nozzle mechanism, a ball ejection mechanism and a first visual detection mechanism are sequentially arranged along the circumferential direction of the turntable mechanism; The hot air nozzle mechanism comprises a heating assembly, the heating assembly is provided with a heating nozzle, a port of the heating nozzle is arranged toward the accommodating station, and the heating assembly is used to supply hot air and spray it to the surface of the heat shrink tube to be tested through the heating nozzle; The ball ejection mechanism comprises a ball circulation assembly, one end of which is provided with a nozzle assembly, the port of which is arranged toward the accommodating station and is used for ejecting balls to the surface of the heat shrink tube to be tested; The first visual inspection mechanism includes a first surface light source disposed below the glass turntable and a first camera disposed above the glass turntable, wherein the first camera is used for taking images of the heat shrink tube to be inspected through light.

[0007] Optionally, a pressing assembly is further provided between the ball ejection mechanism and the first visual detection mechanism, the pressing assembly comprising a first bracket, and a lifting module is provided on the first bracket in a vertical direction; A first support plate is disposed at the driving end of the lifting module, a rotating motor is disposed at one end of the first support plate, a pressing plate is disposed on the output shaft of the rotating motor, and a flexible portion is disposed on the lower end surface of the pressing plate.

[0008] Optionally, a second visual detection mechanism is further provided before the hot air spray head mechanism, and the second visual detection mechanism includes a second camera arranged horizontally, and a second surface light source arranged opposite to the first camera; wherein the second camera is located on the outside of the glass turntable, and the second surface light source is located on the inside of the glass turntable; The second camera is arranged on the second bracket, and an adjustment component is arranged between the second bracket and the second camera. The adjustment component includes an adjustment rail arranged along a preset direction, and a locking member for locking the adjustment rail.

[0009] Optionally, the turntable mechanism includes a mounting plate, the output shaft of the drive motor is connected to the center of the mounting plate, and the glass turntable is arranged on the upper end surface of the mounting plate; An encoder is arranged on the second bracket, and a detection end of the encoder is connected to the center of the mounting plate.

[0010] Optionally, the ball ejection mechanism includes a third bracket and a motor component, and the ball circulation assembly is mounted on the third bracket; The ball circulation assembly includes a screw rod component, which is drive-connected to the motor component. A spiral track for rolling balls is provided on the screw rod component. One end of the spiral track is connected to the nozzle assembly. The motor component runs to drive the screw rod component to rotate, thereby driving the balls to move along the spiral track.

[0011] Optionally, the ball ejection mechanism further includes a collecting box, one end of the nozzle assembly is arranged opposite to the opening of the collecting box, and the collecting box is used to collect the balls ejected from the nozzle assembly; wherein, a feed port connected to the spiral track is provided at the lower end of the collecting box.

[0012] The present invention also provides a method for detecting a polyester heat shrink tube for a battery, which is applied to the detection device for the polyester heat shrink tube for a battery as described above, and the detection method comprises: Step S1, placing the heat shrink tube to be tested in the accommodating station of the turntable mechanism, starting the driving motor, driving the glass turntable to rotate, and making the heat shrink tube move along the turntable along a preset path; Step S2, when the heat shrink tube to be tested moves to the position of the hot air nozzle mechanism, the heating component is activated, and hot air is sprayed onto the surface of the heat shrink tube through the heating nozzle to heat the heat shrink tube to simulate the heat shrinking process in actual application; Step S3, the heated heat shrink tube moves with the turntable to the position of the ball ejection mechanism, and the ball circulation assembly ejects balls onto the surface of the heat shrink tube through the nozzle assembly to apply impact force to the heat shrink tube for impact testing; Step S4, moving the heat shrink tube to the position of the first visual inspection mechanism, and under the illumination of the first surface light source, using a first camera disposed above the glass turntable to take a light-transmitting image of the heat shrink tube to obtain a detection image; Step S5, judging the thickness distribution and internal defects of the heat shrink tube according to the obtained detection image, and performing classification processing based on the judgment result.

[0013] Optionally, a second visual inspection mechanism is provided before the hot air nozzle mechanism, and the steps S1 and S2 further include: Step S20: the second visual inspection mechanism performs light transmission imaging on the heat shrink tube to obtain an initial image, and obtains the initial surface quality of the heat shrink tube based on the initial image.

[0014] Optionally, the step S5 specifically includes: S51, performing image preprocessing on the initial image and the detection image, wherein the image preprocessing includes grayscale processing and image filtering processing; S52, aligning the initial image and the detection image according to the preset feature points of the heat shrink tube to eliminate the image misalignment caused by the rotation of the turntable and the position deviation of the workpiece; S53, subtracting the aligned initial image from the detection image to obtain a differential image, and identifying a brightness change area in the differential image; S54, establishing a light intensity model based on the relationship between the intensity of the transmitted light and the thickness of the material, calculating the gray value of each pixel in the detection image, converting it into a thickness value at the corresponding position, generating a thickness distribution map of the heat shrink tube, and color-coding the thickness values ​​in the thickness distribution map to show thickness changes; S55, identifying thickness abnormality points in the thickness distribution map to identify abnormal areas, and determining the type of internal defects in combination with the brightness change area in the differential image; S56, comparing the measured thickness value with the preset thickness tolerance range to determine whether the thickness is uniform and within the qualified range, and evaluating the product performance according to the type, size and number of internal defects; S57, sending the evaluation results of product performance to the control system to classify the heat shrink tubes.

[0015] Optionally, a pressing component is further provided between the ball ejection mechanism and the first visual detection mechanism, and the steps S3 and S4 further include: Step S40, moving the heat shrink tube to the bottom of the pressing assembly, wherein the pressing assembly performs a pressing test on the heat shrink tube and maintains the pressing test for a preset time.

[0016] Compared with the prior art, the present invention has the following beneficial effects: when working, a driving motor is used to drive the glass turntable to rotate, and the heat shrink tube to be tested is placed in a preset accommodating station on the glass turntable. As the glass turntable rotates, the heat shrink tube passes through the hot air nozzle mechanism, the ball ejection mechanism and the first visual inspection mechanism arranged in the circumferential direction in sequence; first, the heating component of the hot air nozzle mechanism sprays hot air to the surface of the heat shrink tube through the heating nozzle to heat it, simulating the heat shrinkage process in actual use; then, the ball circulation component of the ball ejection mechanism ejects the ball through the nozzle component The heat shrink tube is passed through a first optical inspection mechanism and a first surface light source located below the glass turntable provides transmitted light. The first camera located above the heat shrink tube is used to take images of the heat shrink tube to detect its thickness distribution and internal defects. The equipment uses three testing methods: hot air heating, ball impact and transparent visual inspection to achieve a comprehensive inspection of the thermal shrinkage performance, mechanical strength and internal quality of polyester heat shrink tubes for batteries, which is beneficial to improving the level of product quality control. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0019] Figure 1 This is one of the overall structural schematic diagrams of the detection equipment for polyester heat shrink tube for battery in the first embodiment of the present invention; Figure 2 This is the second overall structural schematic diagram of the detection equipment for polyester heat shrink tube for battery of the first embodiment; Figure 3 This is a schematic diagram of the top view of the structure of the detection device for the polyester heat shrink tube for batteries of the first embodiment; Figure 4 This is a schematic structural diagram of a turntable mechanism of a detection device for polyester heat shrink tube for batteries according to the first embodiment of the present invention; Figure 5 This is a structural schematic diagram of a ball ejection mechanism of a detection device for a polyester heat shrink tube for a battery according to the first embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the pressing component of the detection device for the polyester heat shrink tube for batteries of the first embodiment.

[0020] Illustrations: turntable mechanism 10, glass turntable 11, drive motor 12, accommodating station 13, hot air nozzle mechanism 20, ball ejection mechanism 30, first visual inspection mechanism 40, heating component 21, heating nozzle 22, ball circulation component 31, nozzle component 32, first surface light source 41, first camera 42, pressing component 50, first bracket 51, lifting module 52, first support plate 53, rotating motor 54, pressing plate 55, second visual inspection mechanism 60, second camera 61, second surface light source 62, second bracket 63, adjustment component 64, mounting plate 14, encoder 15, collection box 33. DETAILED DESCRIPTION

[0021] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0023] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0024] Embodiment 1: Combination Figures 1 to 6 As shown, an embodiment of the present invention provides a detection device for polyester heat shrink tube for batteries, including a turntable mechanism 10, the turntable mechanism 10 includes a glass turntable 11, a drive motor 12 and a accommodating station 13 arranged on the upper end surface of the glass turntable 11, and the drive motor 12 is transmission-connected to the glass turntable 11; a hot air nozzle mechanism 20, a ball ejection mechanism 30 and a first visual detection mechanism 40 are sequentially arranged along the circumferential direction of the turntable mechanism 10.

[0025] The hot air nozzle mechanism 20 includes a heating assembly 21, and the heating assembly 21 is provided with a heating nozzle 22. The port of the heating nozzle 22 is arranged toward the accommodating station 13. The heating assembly 21 is used to supply hot air and spray it to the surface of the heat shrinkable tube to be tested through the heating nozzle 22. The hot air is accurately sprayed onto the heat shrinkable tube through the heating nozzle 22 to simulate its heat shrinking process in actual application. In this way, the performance of the heat shrinkable tube under heating conditions, such as shrinkage rate and shrinkage uniformity, can be tested, providing an important basis for quality evaluation.

[0026] The ball ejection mechanism 30 includes a ball circulation assembly 31, one end of which is provided with a nozzle assembly 32, and the port of the nozzle assembly 32 is arranged toward the accommodating station 13, for ejecting balls to the surface of the heat shrink tube to be tested. The ball circulation assembly 31 is responsible for storing and recycling the balls, and the nozzle assembly 32 accurately ejects the balls onto the heat shrink tube. Through the impact of the balls, the mechanical strength and impact resistance of the heat shrink tube can be tested, and its ability to resist external mechanical stress in actual use can be evaluated.

[0027] The first visual inspection mechanism 40 includes a first surface light source 41 disposed below the glass turntable 11, and a first camera 42 disposed above the glass turntable 11. The first camera 42 is used to perform light transmission imaging of the heat shrink tube to be tested. The camera above captures the light passing through the heat shrink tube and obtains its image information. Through light transmission imaging, the thickness distribution, internal defects (such as bubbles, impurities) and surface quality of the heat shrink tube can be detected, providing a more comprehensive quality assessment than surface visual inspection.

[0028] The working principle of the present invention is as follows: when working, the driving motor 12 is used to drive the glass turntable 11 to rotate, and the heat shrink tube to be tested is placed in a preset accommodating station 13 on the glass turntable 11. As the glass turntable 11 rotates, the heat shrink tube passes through the hot air nozzle mechanism 20, the ball ejection mechanism 30 and the first visual inspection mechanism 40 arranged in the circumferential direction in sequence; first, the heating component 21 of the hot air nozzle mechanism 20 sprays hot air to the surface of the heat shrink tube through the heating nozzle 22 to heat it, simulating the heat shrink process in actual use; then, the ball circulation component 31 of the ball ejection mechanism 30 passes through the nozzle component 32 The balls are sprayed onto the surface of the heat shrink tube to apply mechanical impact to it and test its physical strength and impact resistance. After that, the treated heat shrink tube enters the area of ​​the first visual inspection mechanism 40, and the first surface light source 41 located below the glass turntable 11 provides transmitted light. The first camera 42 arranged above takes images of the heat shrink tube through light to detect its thickness distribution and internal defects. The equipment uses three testing methods, namely hot air heating, ball impact and light-transmitting visual inspection, to achieve a comprehensive inspection of the thermal shrinkage performance, mechanical strength and internal quality of polyester heat shrink tubes for batteries, which is conducive to improving the level of product quality control.

[0029] In this embodiment, a pressing assembly 50 is further arranged between the ball ejection mechanism 30 and the first visual detection mechanism 40, and the pressing assembly 50 includes a first bracket 51, and a lifting module 52 is arranged on the first bracket 51 along the vertical direction; a first support plate 53 is arranged at the driving end of the lifting module 52, and a rotating motor 54 is arranged at one end of the first support plate 53, and a pressing plate 55 is arranged on the output shaft of the rotating motor 54, and a flexible portion is arranged on the lower end surface of the pressing plate 55.

[0030] It should be noted that a pressing step is introduced between the ball impact test and the light transmission visual inspection. The pressing assembly 50 moves the pressing plate 55 up and down through the lifting module 52, and the rotating motor 54 enables the pressing plate 55 to rotate; the flexible component at the lower end of the pressing plate 55 can apply uniform pressure without damaging the heat shrink tube, simulating the pressure or deformation of the heat shrink tube in actual use, and further testing its performance under stress conditions. This makes the testing process more comprehensive and can test the heat shrink tube's ability to resist deformation.

[0031] In the present embodiment, it is further explained that a second visual detection mechanism 60 is provided before the hot air nozzle mechanism 20, and the second visual detection mechanism 60 includes a second camera 61 arranged horizontally, and a second surface light source 62 arranged opposite to the first camera 42; wherein, the second camera 61 is located on the outer side of the glass turntable 11, and the second surface light source 62 is located on the inner side of the glass turntable 11; the second camera 61 is arranged on the second bracket 63, and an adjustment component 64 is arranged between the second bracket 63 and the second camera 61, and the adjustment component 64 includes an adjustment rail arranged along a preset direction, and a locking member for locking the adjustment rail.

[0032] It should be noted that the unheated heat shrink tube can be imaged through light transmission through the second visual inspection mechanism 60 to obtain image information of the initial state. The adjustment component 64 allows the position of the second camera 61 to be accurately adjusted to ensure that a clear and accurate image is obtained, which helps to find initial defects or dimensional deviations of the heat shrink tube before heating.

[0033] In this embodiment, the turntable mechanism 10 includes a mounting disk 14, the output shaft of the driving motor 12 is connected to the center of the mounting disk 14, and the glass turntable 11 is arranged on the upper end surface of the mounting disk 14; an encoder 15 is arranged on the second bracket 63, and the detection end of the encoder 15 is connected to the center of the mounting disk 14.

[0034] It should be noted that an encoder 15 is installed on the second bracket 63, and the detection end is connected to the center of the mounting disk 14, which can monitor the rotation speed and angular position of the turntable in real time, which helps to coordinate the working synchronization of each detection mechanism and ensure that the heat shrink tube enters each detection area at the right time.

[0035] In this embodiment, it is specifically described that the ball ejection mechanism 30 includes a third bracket and a motor component, and the ball circulation assembly 31 is installed on the third bracket; the ball circulation assembly 31 includes a screw component, which is drive-connected to the motor component, and a spiral track for the balls to roll is provided on the screw component, and one end of the spiral track is connected to the nozzle assembly 32. The motor component runs to drive the screw component to rotate, thereby driving the balls to move along the spiral track.

[0036] It should be noted that by setting a spiral track on the screw rod, the motor drives the screw rod to rotate, forming a function similar to a ball screw, so that the ball moves along the spiral track to the nozzle assembly 32, and the ball can be continuously and stably transported to the nozzle, realizing continuous impact testing on the surface of the heat shrink tube.

[0037] In this embodiment, it is further described that the ball ejection mechanism 30 also includes a collecting box 33, one end of the nozzle assembly 32 is arranged opposite to the opening of the collecting box 33, and the collecting box 33 is used to collect the balls ejected from the nozzle assembly 32; wherein, the lower end of the collecting box 33 is provided with a feed port connected to the spiral track.

[0038] The ejected balls are collected by the collecting box 33 after impacting the heat shrink tube. The feed port at the lower end of the collecting box 33 is connected to the spiral track of the ball circulation assembly 31, so that the balls can enter the spiral track again, thus forming a recycling use of the balls.

[0039] Embodiment 2: The present invention also provides a method for detecting a polyester heat shrink tube for a battery, which is applied to a detection device for a polyester heat shrink tube for a battery as in Example 1. The detection method comprises: Step S1, placing the heat shrink tube to be tested in the accommodating station 13 of the turntable mechanism 10, starting the driving motor 12, driving the glass turntable 11 to rotate, so that the heat shrink tube moves along with the turntable along a preset path.

[0040] Step S2, when the heat shrink tube to be tested moves to the position of the hot air nozzle mechanism 20, the heating component 21 is activated, and hot air is sprayed onto the surface of the heat shrink tube through the heating nozzle 22 to heat the heat shrink tube to simulate the heat shrinking process in actual application.

[0041] Step S3, the heated heat shrink tube moves with the turntable to the position of the ball ejection mechanism 30, and the ball circulation component 31 ejects balls onto the surface of the heat shrink tube through the nozzle component 32, exerting impact force on it to perform an impact test.

[0042] Step S4, the heat shrink tube is moved to the position of the first visual inspection mechanism 40, and under the illumination of the first surface light source 41, the first camera 42 arranged above the glass turntable 11 takes a light-transmitting image of the heat shrink tube to obtain a detection image.

[0043] Step S5, judging the thickness distribution and internal defects of the heat shrink tube according to the obtained detection image, and performing classification processing based on the judgment result.

[0044] In this embodiment, the following steps are included between step S1 and step S2: In step S20 , the second visual inspection mechanism 60 performs light transmission imaging on the heat shrink tube to obtain an initial image, and acquires the initial surface quality of the heat shrink tube based on the initial image.

[0045] Between step S1 (loading and rotating transmission) and step S2 (hot air heating), step S20 is added. In this step, the second visual inspection mechanism 60 takes a light-transmitting image of the heat shrinkable tube to be inspected, obtains an initial image, and obtains the initial surface quality of the heat shrinkable tube based on the initial image. By obtaining the initial state of the heat shrinkable tube before the heating treatment, its original surface quality and thickness distribution can be recorded to provide a reference benchmark for subsequent inspections.

[0046] In this embodiment, it is specifically described that step S5 specifically includes: S51, performing image preprocessing on the initial image and the detection image, the image preprocessing including grayscale processing and image filtering processing; The initial image and the detection image obtained from the second visual detection mechanism 60 and the first visual detection mechanism 40 are preprocessed. The color image is converted into a grayscale image (grayscale processing) to simplify the data volume and processing complexity. Then, filtering technology (such as median filtering, Gaussian filtering, etc.) is used to remove noise and interference in the image to improve the image quality.

[0047] S52, aligning the initial image and the detection image according to the preset feature points of the heat shrink tube to eliminate the image misalignment caused by the rotation of the turntable and the position deviation of the workpiece.

[0048] S53, subtracting the aligned initial image from the detection image to obtain a differential image, and identifying a brightness change area in the differential image; Perform pixel-level subtraction on the aligned initial image and the test image to generate a differential image. The differential image can intuitively reflect the changes that occur in the heat shrink tubing after heating, pressing, and impact testing. By analyzing the brightness change area in the differential image, problem areas such as thickness changes and internal defects can be identified.

[0049] S54, establishing a light intensity model through the relationship between the intensity of the transmitted light and the thickness of the material, calculating the gray value of each pixel in the detection image, converting it into a thickness value at the corresponding position, generating a thickness distribution map of the heat shrink tube, and color-coding the thickness values ​​in the thickness distribution map to show thickness changes; Based on the optical properties of the material, a mathematical model between light intensity and heat shrink tube thickness is established. Through this model, the grayscale value of each pixel in the detection image is converted into the actual thickness value of the corresponding position. Subsequently, a thickness distribution map of the heat shrink tube is generated and displayed in a color-coded manner, making the thickness change more intuitive and clear, and facilitating the identification of areas with uneven thickness.

[0050] S55, identifying thickness variation points in the thickness distribution map to identify abnormal areas, and combining with the brightness variation areas in the differential image to determine the type of internal defects; In the thickness distribution diagram, look for abnormal points where the thickness changes suddenly. These points may represent abnormal thickness areas of the heat shrink tubing. Combined with the brightness change areas identified in the previously obtained differential image, it is possible to further analyze whether these anomalies are caused by internal defects (such as bubbles, cracks, impurities), and determine the type and nature of the defects.

[0051] S56, comparing the measured thickness value with the preset thickness tolerance range to determine whether the thickness is uniform and within the qualified range, and evaluating the product performance according to the type, size and number of internal defects; Compare the actual thickness of each part of the heat shrink tubing with the preset thickness tolerance range to evaluate its thickness uniformity and whether it meets the quality requirements. At the same time, based on the type, size and number of internal defects identified, analyze the impact of defects on product performance and comprehensively evaluate the overall quality of the heat shrink tubing.

[0052] S57, sending the evaluation results of product performance to the control system to classify the heat shrink tubes.

[0053] According to the above evaluation results, the quality grade information of the heat shrink tubing is sent to the control system of the equipment. The control system classifies the heat shrink tubing accordingly: qualified products are sent to the qualified product collection area, and unqualified products or products that need further inspection are diverted to the corresponding areas, realizing automated quality grading and processing.

[0054] In this embodiment, the following steps are included between step S3 and step S4: In step S40, the heat shrink tube is moved to the bottom of the pressing assembly 50, and the pressing assembly 50 performs a pressing test on the heat shrink tube and keeps the pressing time.

[0055] After completing the ball impact test, the heat shrink tube continues to move with the turntable and enters the area of ​​the pressing assembly 50. The pressing assembly 50 includes a pressing plate 55 that can move up and down, and the lower end surface of the pressing plate 55 is provided with a flexible component to avoid damage to the heat shrink tube. The pressing assembly 50 applies a certain pressure to the heat shrink tube and maintains it for a preset time to simulate the compressive stress that the heat shrink tube may withstand in actual use. Through the press test, the mechanical properties of the heat shrink tube, such as the compressive resistance and deformation recovery ability, can be evaluated.

[0056] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A detection device for polyester heat shrink tube for battery, characterized in that: It comprises a turntable mechanism, which comprises a glass turntable, a driving motor and a receiving station arranged on the upper end surface of the glass turntable, and the driving motor is drivingly connected with the glass turntable; A hot air spray head mechanism, a ball ejection mechanism and a first visual detection mechanism are sequentially arranged along the circumferential direction of the turntable mechanism; The hot air nozzle mechanism comprises a heating assembly, the heating assembly is provided with a heating nozzle, a port of the heating nozzle is arranged toward the accommodating station, and the heating assembly is used to supply hot air and spray it to the surface of the heat shrink tube to be tested through the heating nozzle; The ball ejection mechanism comprises a ball circulation assembly, one end of which is provided with a nozzle assembly, the port of which is arranged toward the accommodating station and is used for ejecting balls to the surface of the heat shrink tube to be tested; The first visual inspection mechanism includes a first surface light source disposed below the glass turntable and a first camera disposed above the glass turntable, wherein the first camera is used for taking images of the heat shrink tube to be inspected through light.

2. The detection device for polyester heat shrink tube for battery according to claim 1, characterized in that: A pressing assembly is further provided between the ball ejection mechanism and the first visual detection mechanism, wherein the pressing assembly comprises a first bracket, and a lifting module is provided on the first bracket in a vertical direction; A first support plate is disposed at the driving end of the lifting module, a rotating motor is disposed at one end of the first support plate, a pressing plate is disposed on the output shaft of the rotating motor, and a flexible portion is disposed on the lower end surface of the pressing plate.

3. The detection device for polyester heat shrink tube for battery according to claim 1, characterized in that: A second visual inspection mechanism is also arranged before the hot air spray head mechanism, and the second visual inspection mechanism includes a second camera arranged horizontally, and a second surface light source arranged opposite to the first camera; wherein the second camera is located on the outside of the glass turntable, and the second surface light source is located on the inside of the glass turntable; The second camera is arranged on the second bracket, and an adjustment component is arranged between the second bracket and the second camera. The adjustment component includes an adjustment rail arranged along a preset direction, and a locking member for locking the adjustment rail.

4. The detection device for polyester heat shrink tube for battery according to claim 3, characterized in that: The turntable mechanism comprises a mounting plate, the output shaft of the driving motor is connected to the center of the mounting plate, and the glass turntable is arranged on the upper end surface of the mounting plate; An encoder is arranged on the second bracket, and a detection end of the encoder is connected to the center of the mounting plate.

5. The detection device for polyester heat shrink tube for battery according to claim 1, characterized in that: The ball ejection mechanism comprises a third bracket and a motor component, and the ball circulation assembly is mounted on the third bracket; The ball circulation assembly includes a screw rod component, which is drive-connected to the motor component. A spiral track for rolling balls is provided on the screw rod component. One end of the spiral track is connected to the nozzle assembly. The motor component runs to drive the screw rod component to rotate, thereby driving the balls to move along the spiral track.

6. The detection device for polyester heat shrink tube for battery according to claim 5, characterized in that: The ball ejection mechanism also includes a collecting box, one end of the nozzle assembly is arranged opposite to the opening of the collecting box, and the collecting box is used to collect the balls ejected from the nozzle assembly; wherein, a feed port connected to the spiral track is arranged at the lower end of the collecting box.

7. A method for detecting polyester heat shrinkable tube for battery, characterized in that: The detection device applied to the polyester heat shrink tube for battery according to any one of claims 1 to 6, wherein the detection method comprises: Step S1, placing the heat shrink tube to be tested in the accommodating station of the turntable mechanism, starting the driving motor, driving the glass turntable to rotate, and making the heat shrink tube move along the turntable along a preset path; Step S2, when the heat shrink tube to be tested moves to the position of the hot air nozzle mechanism, the heating component is activated, and hot air is sprayed onto the surface of the heat shrink tube through the heating nozzle to heat the heat shrink tube to simulate the heat shrinking process in actual application; Step S3, the heated heat shrink tube moves with the turntable to the position of the ball ejection mechanism, and the ball circulation assembly ejects balls onto the surface of the heat shrink tube through the nozzle assembly to apply impact force to the heat shrink tube for impact testing; Step S4, moving the heat shrink tube to the position of the first visual inspection mechanism, and under the illumination of the first surface light source, using a first camera disposed above the glass turntable to take a light-transmitting image of the heat shrink tube to obtain a detection image; Step S5, judging the thickness distribution and internal defects of the heat shrink tube according to the obtained detection image, and performing classification processing based on the judgment result.

8. The method for detecting a polyester heat shrinkable tube for a battery according to claim 7, characterized in that: The hot air nozzle mechanism is also provided with a second visual detection mechanism before it, and the steps S1 and S2 further include: Step S20: the second visual inspection mechanism performs light transmission imaging on the heat shrink tube to obtain an initial image, and obtains the initial surface quality of the heat shrink tube based on the initial image.

9. The method for detecting a polyester heat shrink tube for a battery according to claim 8, characterized in that: The step S5 specifically includes: S51, performing image preprocessing on the initial image and the detection image, wherein the image preprocessing includes grayscale processing and image filtering processing; S52, aligning the initial image and the detection image according to the preset feature points of the heat shrink tube to eliminate the image misalignment caused by the rotation of the turntable and the position deviation of the workpiece; S53, subtracting the aligned initial image from the detection image to obtain a differential image, and identifying a brightness change area in the differential image; S54, establishing a light intensity model based on the relationship between the intensity of the transmitted light and the thickness of the material, calculating the gray value of each pixel in the detection image, converting it into a thickness value at the corresponding position, generating a thickness distribution map of the heat shrink tube, and color-coding the thickness values ​​in the thickness distribution map to show thickness changes; S55, identifying thickness abnormality points in the thickness distribution map to identify abnormal areas, and determining the type of internal defects in combination with the brightness change area in the differential image; S56, comparing the measured thickness value with the preset thickness tolerance range to determine whether the thickness is uniform and within the qualified range, and evaluating the product performance according to the type, size and number of internal defects; S57, sending the evaluation results of product performance to the control system to classify the heat shrink tubes.

10. The method for detecting polyester heat shrinkable tube for battery according to claim 7, characterized in that: A pressing component is further provided between the ball ejection mechanism and the first visual detection mechanism, and between step S3 and step S4, the following is further included: Step S40, moving the heat shrink tube to the bottom of the pressing assembly, wherein the pressing assembly performs a pressing test on the heat shrink tube and maintains the pressing test for a preset time.

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