A device for detecting the wall thickness uniformity of a blow molded article

Abstract

A device for detecting the uniformity of wall thickness in blow-molded products, belonging to the field of blow-molded product testing technology, includes a processing platform with a circular through-slot in the center and columns installed at the four corners of the bottom. It also includes a turntable, a blow-molded product, and a testing component. The turntable is rotatably positioned within the circular through-slot in the center of the processing platform. The blow-molded product is centrally positioned on the turntable by an internal support unit. The testing component is located on the blow-molded product and is used to detect the uniformity of its thickness. By using the rotation of the blow-molded product in conjunction with separate detection of its inner and outer diameters, the device can visually present the circumferential wall thickness uniformity of the blow-molded product. Inspectors can quickly determine quality without complex data analysis, significantly improving testing efficiency. It also avoids the limitations of single-point detection, accurately identifies hidden defects where parts are acceptable but the overall structure is deformed, reduces the risk of defective products leaving the product, ensures comprehensive and accurate testing, and provides support for quality control.

Description

Technical Field

[0001] This utility model belongs to the field of blow-molded product testing technology, specifically relating to a device for testing the uniformity of wall thickness of blow-molded products. Background Technology

[0002] In the production process of hollow cylindrical blow-molded products, wall thickness inspection is a crucial step in ensuring product quality and pass rate after the blow molding process. The uniformity of wall thickness directly affects the mechanical properties of these products, including compressive strength, impact resistance, service stability, and lifespan. Defects such as excessively thin or thick walls in certain areas can easily lead to cracking and deformation during subsequent use. Therefore, it is necessary to use professional testing methods to inspect the wall thickness distribution, screen out qualified products that meet quality standards, avoid quality risks caused by uneven wall thickness, and ensure that the products meet the requirements of the application scenarios.

[0003] A related technology (Chinese patent CN105313310A) discloses a method for detecting the wall thickness of hollow blow-molded products. This method employs a preform wall thickness optimization strategy integrating finite element method, artificial neural network, and genetic algorithm. The blow molding process is simulated using the commercial finite element analysis software POLYFLOW, and the simulation results are used to establish an ANN model relating the preform wall thickness distribution to the optimization objective function. Then, an online detection system for blow-molded product wall thickness is constructed using ultrasonic technology. The established online control system for extruded blow-molded product wall thickness can effectively control the wall thickness of products formed using traditional blow molding methods.

[0004] In the thickness inspection of hollow blow-molded products, existing testing equipment struggles to visually display the wall thickness uniformity results. Even if the thickness meets requirements in localized areas, overall deformation of the inner and outer walls can still lead to inconsistent wall thickness uniformity. Traditional thickness-only testing methods only provide local dimensional information, failing to allow inspectors to directly determine whether the wall thickness uniformity of the entire blow-molded product meets finished product standards. The drawbacks of this testing method are primarily twofold: first, the results are not intuitively presented, increasing the difficulty of data interpretation for inspectors and reducing testing efficiency; second, it is difficult to identify issues where localized areas are acceptable but overall deformation occurs, easily overlooking hidden quality defects and allowing substandard products to pass inspection, posing safety hazards or performance risks for subsequent use. Utility Model Content

[0005] To address the limitations of existing technologies that focus solely on thickness detection, providing only localized dimensional information and failing to allow inspectors to directly determine whether the wall thickness uniformity of the entire blow-molded product meets finished product standards, this invention provides a blow-molded product wall thickness uniformity detection device. This device visually presents the circumferential wall thickness uniformity of the blow-molded product, allowing inspectors to quickly determine the quality status without complex analysis of scattered data, significantly improving inspection efficiency. Simultaneously, it effectively avoids the limitations of single-point detection, accurately identifying hidden defects such as partial compliance but overall deformation, reducing the risk of defective products leaving the product, and making finished blow-molded product inspection more comprehensive and accurate, providing reliable support for product quality control. The specific technical solution is as follows: A device for detecting the wall thickness uniformity of blow-molded products includes a processing platform with a circular through-slot in the middle and columns installed at the four corners of the bottom of the processing platform. It also includes a turntable, a blow-molded product, and a detection component. The turntable is rotatably disposed within the circular through-slot in the middle of the processing platform. The blow-molded product is centrally positioned on the turntable by an internal support unit. The detection component is disposed on the blow-molded product and is used to detect the thickness uniformity of the blow-molded product. The detection assembly includes: a support arm, an extension arm, a ball, a positioning seat, a spring, a marker pen, and a marking plate. The support arm is vertically mounted on the processing platform. The extension arm slides through the top of the support arm. The ball is mounted on one end of the extension arm and fits tightly against the side wall of the blow-molded product. The positioning seat is mounted on the other end of the extension arm. The spring is sleeved on the ball, and both ends of the spring are fixedly connected to the side wall of the support arm and the side wall of the positioning seat, respectively. The marker pen is vertically positioned within the cavity of the positioning seat. The marking plate is mounted on the processing platform and positioned below the marker pen.

[0006] In the above technical solution, the marker pen is positioned in the inner cavity of the spring by a locking component. The locking component includes a positioning bolt and a first positioning block. The positioning bolt is threaded and rotatably passes through the positioning seat. The first positioning block is installed at one end of the positioning bolt inserted into the inner cavity of the positioning seat, and the first positioning block is tightly abutted against the side wall of the marker pen, thereby realizing the positioning of the marker pen in the inner cavity of the positioning seat.

[0007] In the above technical solution, the detection components are respectively disposed on the inner and outer sides of the blow-molded product, for detecting the contact between the ball of the detection component on the outer side of the blow-molded product and the outer wall of the blow-molded product; and for detecting the contact between the ball of the detection component on the inner side of the blow-molded product and the inner wall of the blow-molded product.

[0008] In the above technical solution, the extension arm of the detection component used to detect the inner wall of the blow-molded product adopts a telescopic structure that can extend and retract in the vertical direction.

[0009] In the above technical solution, a drive assembly is provided below the turntable. The drive assembly includes a motor frame and a stepper motor. The stepper motor is installed on the motor frame, and the output end of the stepper motor is connected to the middle of the lower surface of the turntable.

[0010] In the above technical solution, the inner support unit includes: a screw, a sleeve, a drive rod, a connecting seat, and an inner support block. The screw is rotatably mounted on the center of the upper surface of the turntable via an embedded bearing. The sleeve is threaded onto the screw. Multiple sets of drive rods are provided, with one end of each set rotatably connected to the side wall of the sleeve. The connecting seat is rotatably connected to the other end of the drive rod. The inner support block is installed on the side wall of the connecting seat, and the side wall of the inner support block abuts against the inner wall of the blow-molded product.

[0011] In the above technical solution, the inner support unit further includes: a fixed plate, a guide rod, and a slider. The fixed plate is fixedly installed on the turntable along the radial direction of the turntable; the guide rod is installed in the inner cavity of the fixed plate along the radial direction of the turntable; the slider is fixedly installed at the bottom end of the inner support block, and the slider is slidably sleeved on the guide rod.

[0012] In the above technical solution, the inner support block abutting against the inner wall of the blow-molded product is configured as an arc-shaped structure.

[0013] In the above technical solution, the bottom end of the screw is provided with a plug-in structure, which includes: a rotating plate, a second positioning block, a positioning pin, and a positioning hole. The rotating plate is fixedly installed on the bottom end of the screw; the second positioning block is fixedly installed on the side wall of the rotating plate; the positioning pin passes through the second positioning block in a vertical direction; multiple sets of positioning holes are provided, and the multiple sets of positioning holes are respectively opened through the upper surface of the turntable, and the bottom end of the positioning pin is inserted into the inner cavity of one of the positioning holes.

[0014] In the above technical solution, multiple sets of positioning holes are arranged circumferentially at equal intervals with the vertical center line of the screw as the axis.

[0015] The present invention provides a device for detecting the wall thickness uniformity of blow-molded products. Compared with the prior art, the advantages of this device are as follows: I. Addressing the issue that existing simple thickness testing methods can only obtain local dimensional information, failing to allow inspectors to directly determine whether the wall thickness uniformity of the entire blow-molded product meets standards, this invention employs a method combining the blow-molded product's rotation with separate detection of its inner and outer diameters: when the marker consistently displays dotted marks, it indicates that the sidewall of the blow-molded product is uniform; conversely, if the marker displays linear marks, it indicates that the corresponding inner or outer wall of the blow-molded product is uneven. This setup can intuitively present the circumferential wall thickness uniformity of the blow-molded product, allowing inspectors to quickly determine the quality status without complex analysis of scattered data, significantly improving inspection efficiency. Simultaneously, it effectively avoids the limitations of single-point detection, accurately identifying hidden defects where locally acceptable but the overall product is deformed, reducing the risk of defective products leaving the product, making the inspection of finished blow-molded products more comprehensive and accurate, and providing reliable support for product quality control. II. In this utility model, the extension arm used for detecting the inner wall size is designed as a hook structure. It uses the elastic force generated by its own spring to pull the corresponding ball, positioning it to fit the inner sidewall of the blow-molded product. The extension arm used for detecting the outer wall size adopts a straight structure. It uses the elastic force generated by its own spring to push the corresponding ball, positioning it to fit the outer sidewall of the blow-molded product. Although both rely on the elastic force of the spring to achieve the fit between the ball and the sidewall of the blow-molded product, depending on the different requirements of the ball fitting the inner or outer wall of the blow-molded product, the two elastic force actions of the spring—tension or push—are used respectively. It is only necessary to meet the positioning requirements of the ball fitting the corresponding sidewall of the blow-molded product. The specific settings can be determined according to the actual detection needs. That is, this invention uses the same elastic driving principle to detect the thickness of the blow-molded product, ensuring the consistency and reliability of the inner and outer wall detection methods. Furthermore, the differentiated structural design adapts to different detection scenarios, simplifying the design logic of the overall detection mechanism, reducing the difficulty of component adaptation, and facilitating later maintenance and debugging, thus improving the versatility and practicality of the device. Third, in this utility model, through the coordinated cooperation of the positioning bolt, the first positioning block, and the positioning seat, the marking pen can be precisely positioned vertically on the marking plate. This positioning method ensures that during subsequent testing, the marking pen can leave corresponding and accurate trace information on the marking plate according to the changes in the outer wall thickness of the blow-molded product, thus guaranteeing the accuracy of the blow-molded product thickness testing results. On the one hand, the vertical positioning of the marking pen eliminates the problem of trace distortion caused by posture deviation, ensuring that the trace information can truly reflect the outer wall thickness state of the blow-molded product, laying the foundation for the accuracy of the testing results. On the other hand, the position of the marking pen can be flexibly adjusted and a new marking pen can be replaced according to the usage of the marking pen, making the use of the equipment repeatable. IV. This utility model adopts an internal support structure, which stably supports the blow-molded product on the turntable, thereby ensuring the blow-molded product is centered and positioned, and ensuring that the relative position of the blow-molded product and the detection components at each position remains consistent, without interfering with the detection of the inner and outer walls of the blow-molded product. The internal support provides a stable and accurate positioning reference for the blow-molded product, preventing the blow-molded product from shifting during the detection process and ensuring the accuracy of the detection data. At the same time, the non-interference layout ensures that the inner and outer wall detection operations can be carried out independently and smoothly without the need for frequent adjustment of component positions, effectively improving detection efficiency and reducing surface damage to the blow-molded product or wear and tear on the detection components that may be caused by component interference. V. In this utility model, through the coordinated cooperation of the screw, drive rod, and inner support block, the blow-molded product can be precisely centered on the turntable using an inner support positioning method. This positioning structure ensures that when the turntable rotates, it can stably drive the blow-molded product to rotate synchronously in the center, thereby ensuring that the multiple sets of detection components arranged around the blow-molded product always maintain the preset correct detection position relative to the blow-molded product, providing a basic guarantee for the accuracy of subsequent detection results. The synchronous centered rotation of the turntable and the blow-molded product eliminates the problem of detection position misalignment caused by asynchronous rotation, allowing multiple sets of detection components to collect data stably at the same time. This not only improves detection efficiency but also avoids detection errors caused by position deviations, further ensuring the consistency and reliability of results in batch detection scenarios. In summary, this utility model has several significant advantages: First, by using the rotation of the blow-molded product in conjunction with separate detection of its inner and outer diameters, the circumferential wall thickness uniformity of the blow-molded product can be directly presented. Inspectors can quickly judge quality without complex data analysis, significantly improving inspection efficiency. It also avoids the limitations of single-point inspection, accurately identifies hidden defects where parts are qualified but the overall structure is deformed, reduces the risk of defective products leaving the product, and ensures comprehensive and accurate inspection, providing support for quality control. Second, relying on the same elastic drive principle to achieve thickness detection of the blow-molded product ensures both the consistency and reliability of inner and outer wall detection. Furthermore, the differentiated structure adapts to different inspection scenarios, simplifying the mechanism design logic, reducing the difficulty of component adaptation, facilitating later maintenance and debugging, and improving the versatility and practicality of the device. Third, the positioning bolt, the first positioning block, and the positioning seat work together to achieve vertical positioning of the marking pen, eliminating... Besides preventing distortion of traces caused by posture deviation, ensuring that the trace information accurately reflects the outer wall thickness of the blow-molded product lays the foundation for detection accuracy. Furthermore, the ability to flexibly adjust the marker pen position and replace the marker pen ensures repeatability of the equipment. Fourth, the internal support structure provides a stable and precise positioning reference for the blow-molded product, preventing deviation during detection and ensuring data accuracy. Simultaneously, the non-interference layout allows for independent and smooth detection of the inner and outer walls, eliminating the need for frequent component adjustments, improving detection efficiency, and reducing surface damage to the blow-molded product and wear on detection components. Fifth, the screw, drive rod, and internal support block work together to achieve precise centered positioning of the blow-molded product, ensuring that the turntable and the blow-molded product rotate synchronously in the center, eliminating detection misalignment caused by asynchronous rotation, and enabling multiple detection components to stably collect data. This improves efficiency and avoids detection errors caused by positional deviations, ensuring consistency and reliability of results during batch testing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the processing platform of this utility model; Figure 2 This is a front view of the support arm of this utility model; Figure 3 This is a top view of the inner support block of this utility model; Figure 4 This is a schematic diagram of the structure of the first positioning block of this utility model; Figure 5 This is a schematic diagram of the structure of the turntable of this utility model; Figure 6 This is a schematic diagram of the screw structure of this utility model; Figure 7 for Figure 6 Enlarged view of point A; Figures 1 to 7In the diagram, 1. Processing platform, 2. Column, 3. Turntable, 4. Blow-molded product, 5. Support arm, 6. Extension arm, 7. Sphere, 8. Positioning seat, 9. Spring, 10. Marking pen, 11. Positioning bolt, 12. First positioning block, 13. Marking plate, 14. Motor frame, 15. Stepper motor, 16. Screw, 17. Sleeve, 18. Drive rod, 19. Connecting seat, 20. Inner support block, 21. Fixing plate, 22. Guide rod, 23. Slider, 24. Rotating plate, 25. Second positioning block, 26. Positioning pin, 27. Positioning hole. Detailed Implementation

[0017] The following are specific implementation cases and appendices. Figures 1 to 7 The present invention will be further described below, but the present invention is not limited to these embodiments.

[0018] A device for detecting the uniformity of wall thickness of blow-molded products includes a processing platform 1 with a circular through-slot in the middle. Columns 2 are installed at the four corners of the bottom of the processing platform 1. The device also includes a turntable 3, a blow-molded product 4, and a detection component. The turntable 3 is rotatably positioned within the circular through-slot in the middle of the processing platform 1. The blow-molded product 4 is centrally positioned on the turntable 3 by an internal support unit. The detection component is located on the blow-molded product 4 and is used to detect the uniformity of the thickness of the blow-molded product 4. The detection component includes a support arm 5, an extension arm 6, a ball 7, and a positioning seat 8. A spring 9, a marker pen 10, and a marking plate 13 are included. A support arm 5 is vertically mounted on a processing platform 1. An extension arm 6 slides through the top of the support arm 5. A ball 7 is mounted on one end of the extension arm 6 and fits tightly against the side wall of the blow-molded product 4. A positioning seat 8 is mounted on the other end of the extension arm 6. A spring 9 is sleeved on the ball 7, and both ends of the spring 9 are fixedly connected to the side wall of the support arm 5 and the side wall of the positioning seat 8, respectively. The marker pen 10 is positioned vertically in the inner cavity of the positioning seat 8. The marking plate 13 is mounted on the processing platform 1 and is positioned below the marker pen 10.

[0019] This invention employs a combination of rotation of the blow-molded product 4 and separate detection of its inner and outer diameters to determine wall thickness uniformity. If the marking pen 10 maintains a dotted pattern, it indicates uniform sidewall thickness of the blow-molded product 4; if the marking pen 10 shows a linear pattern, it indicates uneven thickness on the corresponding inner or outer wall of the blow-molded product 4. This detection setup visually displays the circumferential wall thickness uniformity of the blow-molded product 4. Inspectors can quickly determine product quality without complex processing and analysis of fragmented test data, significantly improving inspection efficiency. Simultaneously, it effectively overcomes the limitations of single-point detection, accurately identifying hidden quality defects such as "local thickness compliance but overall shape deformation," reducing the risk of substandard products entering subsequent stages. This makes the finished product inspection of the blow-molded product 4 more comprehensive and accurate, providing reliable assurance for product quality control.

[0020] In addition, in this invention, the extension arm 6 used for detecting the inner wall size is designed as a hook structure. With the elastic force generated by its own spring 9, it can connect and position the corresponding ball 7 to fit the inner sidewall of the blow-molded product 4. The extension arm 6 used for detecting the outer wall size adopts a straight structure. With the elastic force generated by its own spring 9, it can connect and position the corresponding ball 7 to fit the outer sidewall of the blow-molded product 4. Although both use the elastic force of the spring 9 to achieve the fit between the ball 7 and the sidewall of the blow-molded product 4, depending on whether the ball 7 needs to fit the inner or outer wall of the blow-molded product 4, two elastic force actions of the spring 9 are used: either pulling or pushing. As long as the positioning requirement of the ball 7 fitting the corresponding sidewall of the blow-molded product 4 is met, the specific settings can be flexibly determined according to actual detection needs. This invention uses the same elastic drive principle to detect the thickness of blow-molded products, ensuring the consistency and reliability of the detection methods for the inner and outer walls. It also adapts to different detection scenarios with its differentiated structural design, simplifying the design logic of the overall detection mechanism, reducing the difficulty of component adaptation, and providing convenience for later maintenance and debugging, effectively improving the versatility and practicality of the device.

[0021] The marker pen 10 is positioned within the cavity of the spring 9 by a locking assembly, which includes a positioning bolt 11 and a first positioning block 12. The positioning bolt 11 is threaded and rotatably passes through the positioning seat 8. The first positioning block 12 is installed at the end of the positioning bolt 11 that is inserted into the cavity of the positioning seat 8, and the first positioning block 12 abuts tightly against the side wall of the marker pen 10, thereby positioning the marker pen 10 within the cavity of the positioning seat 8.

[0022] In this invention, the positioning bolt 11, the first positioning block 12, and the positioning seat 8 work together to precisely position the marking pen 10 vertically on the marking plate 13. This positioning method ensures that during subsequent testing, the marking pen 10 leaves corresponding and accurate trace information on the marking plate 13 according to the changes in the outer wall thickness of the blow-molded product 4, thus guaranteeing the accuracy of the thickness test results for the blow-molded product 4. On the one hand, the vertical positioning of the marking pen 10 avoids trace distortion caused by posture deviation, ensuring that the trace information can truly reflect the thickness state of the outer wall of the blow-molded product 4, laying the foundation for the accuracy of the test results; on the other hand, the position of the marking pen 10 can be flexibly adjusted and new marking pens 10 can be replaced according to the usage condition of the marking pen 10, making the equipment reusable.

[0023] The detection components are respectively set on the inner and outer sides of the blow-molded product 4. The ball 7 of the detection component on the outer side of the blow-molded product 4 abuts against the outer wall of the blow-molded product 4; the ball 7 of the detection component on the inner side of the blow-molded product 4 abuts against the inner wall of the blow-molded product 4. This allows for simultaneous detection of the inner and outer sides of the blow-molded product 4 and provides a direct visual indication of whether the thickness of the blow-molded product 4 is uniform.

[0024] The extension arm 6 for detecting the inner wall dimensions is designed with a hook structure. The spring 9 on the extension arm 6 pulls the corresponding ball 7 to connect and position it against the inner wall of the blow-molded product 4. The extension arm 6 for detecting the outer wall dimensions has a straight structure. The spring 9 on the extension arm 6 pushes the corresponding ball 7 to connect and position it against the outer wall of the blow-molded product 4. Although both rely on the spring 9 to achieve the contact between the ball 7 and the side wall of the blow-molded product 4, the spring 9 is used in two different forms—pull or push—depending on whether the ball 7 is against the inner or outer wall of the blow-molded product 4. Ultimately, it only needs to meet the positioning requirement of the ball 7 against the corresponding side wall of the blow-molded product 4. The specific setting can be determined according to the actual detection requirements.

[0025] The extension arm 6 of the detection component used to detect the inner wall of the blow-molded product 4 adopts a telescopic structure that can extend and retract vertically. The ball 7 at the end of the straight extension arm 6 is manually placed against the outer wall of the blow-molded product 4, while the ball 7 at the end of the hook-shaped extension arm 6 is placed against the inner wall of the blow-molded product 4. The extension arm 6 uses a commercially available telescopic damping self-locking structure, meaning that after the extension arm 6 is extended or retracted under manual external force, it can lock to the corresponding extension length, ensuring that the ball 7 will not be driven to undergo vertical relative displacement relative to the blow-molded product 4 during rotation of the blow-molded product 4. The damping performance of the extension arm 6's telescopic structure only needs to meet the above-mentioned usage requirements; its specific parameters are not elaborated or limited here.

[0026] A drive assembly is located below the turntable 3. The drive assembly includes a motor frame 14 and a stepper motor 15. The stepper motor 15 is mounted on the motor frame 14, and its output end is connected to the center of the lower surface of the turntable 3. The stepper motor 15 is a commercially available motor of standard specifications, which is existing technology and can meet the above-mentioned usage requirements. It will not be described or limited here. After the stepper motor 15 is started, it drives the turntable 3 to rotate synchronously with the blow-molded product 4, so as to realize the rotation of the blow-molded product 4 relative to each group of detection components, thereby realizing the detection of the thickness uniformity of the blow-molded product 4 by each detection component.

[0027] The inner support unit includes: a screw 16, a sleeve 17, a drive rod 18, a connecting seat 19, and an inner support block 20. The screw 16 is rotatably mounted on the middle of the upper surface of the turntable 3 via an embedded bearing; the sleeve 17 is threaded onto the screw 16; multiple sets of drive rods 18 are provided, and one end of each set of drive rods 18 is rotatably connected to the side wall of the sleeve 17; the connecting seat 19 is rotatably connected to the other end of the drive rod 18; the inner support block 20 is installed on the side wall of the connecting seat 19, and the side wall of the inner support block 20 abuts against the inner side wall of the blow-molded product 4.

[0028] This invention employs an internal support structure, which stably supports the blow-molded product 4 on the turntable 3, ensuring the blow-molded product 4 is subsequently positioned in a centered manner. This maintains the relative position of the blow-molded product 4 with each detection component and prevents interference with the detection of the inner and outer walls of the blow-molded product 4. The internal support provides a stable and precise positioning reference for the blow-molded product 4, preventing it from shifting during the detection process and ensuring the accuracy of the detection data. Simultaneously, the non-interference layout ensures that the inner and outer wall detection operations can be carried out independently and smoothly, eliminating the need for frequent adjustments to component positions, effectively improving detection efficiency, and reducing potential surface damage to the blow-molded product 4 or wear and tear on detection components due to component interference.

[0029] The inner support unit also includes: a fixed plate 21, a guide rod 22 and a slider 23. The fixed plate 21 is fixedly installed on the turntable 3 along the radial direction of the turntable 3; the guide rod 22 is installed in the inner cavity of the fixed plate 21 along the radial direction of the turntable 3; the slider 23 is fixedly installed at the bottom end of the inner support block 20 and slides on the guide rod 22.

[0030] In this invention, the blow-molded product 4 is precisely centered on the turntable 3 by means of the coordinated action of the screw 16, the drive rod 18, and the inner support block 20 through an inner support positioning method. This positioning structure ensures that when the turntable 3 rotates, it can stably drive the blow-molded product 4 to rotate synchronously in a centered manner, thereby ensuring that the multiple sets of detection components arranged around the blow-molded product 4 always maintain the preset correct detection position relative to the blow-molded product 4, laying a solid foundation for the accuracy of subsequent detection results. The synchronous centered rotation of the turntable 3 and the blow-molded product 4 effectively eliminates the problem of detection position misalignment caused by asynchronous rotation between the two, allowing multiple sets of detection components to simultaneously and stably collect data. This not only improves detection efficiency but also avoids detection errors caused by positional deviations, further providing strong support for the consistency and reliability of results in batch detection scenarios.

[0031] The inner support block 20 is set with an arc-shaped structure on one side of the inner wall of the blow-molded product 4, so as to ensure that the inner support block 20 and the blow-molded product 4 have sufficient contact surface and ensure the relative stability of the blow-molded product 4 and the inner support block 20 in the inner support state.

[0032] The bottom end of the screw 16 is provided with a plug-in structure. The screw 16 is a self-locking screw 16 available on the market. It can self-lock when it stops rotating and will not rotate due to external forces. The thread pitch, lead, and coefficient of friction of the screw are all existing technologies, which only need to meet the requirements of this application and will not be described or limited here. The plug-in structure includes: a rotating plate 24, a second positioning block 25, a positioning pin 26, and a positioning hole 27. The rotating plate 24 is fixedly installed at the bottom end of the screw 16; the second positioning block 25 is fixedly installed on the side wall of the rotating plate 24; the positioning pin 26 passes through the second positioning block 25 in the vertical direction; multiple sets of positioning holes 27 are provided, and multiple sets of positioning holes 27 are respectively opened through the upper surface of the turntable 3, and the bottom end of the positioning pin 26 is inserted into the inner cavity of one of the positioning holes 27. The multiple sets of positioning holes 27 are arranged circumferentially at equal intervals with the vertical center line of the screw 16 as the axis. After positioning, in order to further ensure the stability of the screw 16, the positioning pin 26 passes through the second positioning block 25 and is embedded in the cavity of the positioning hole 27 at the corresponding position, so as to further lock the screw 16 after rotation.

[0033] The working principle of the blow-molded product wall thickness uniformity detection device in this embodiment is as follows: The blow-molded product 4 is placed on the turntable 3. The drive screw 16 is rotated, which drives the sleeve 17 to move downward along the screw 16. This causes the three sets of drive rods 18 connected to the sleeve 17 to drive the corresponding connecting seat 19 and inner support block 20 to move outward. This causes the slider 23 to move along the corresponding guide rod 22, ensuring that the inner support block 20 is displaced perpendicular to the inner wall of the blow-molded product 4, until each inner support block 20 is tightly against the inner wall of the blow-molded product 4. This achieves the inner support block 20 being internally supported and positioned on the inner wall of the blow-molded product 4. After positioning, the blow-molded product 4 and the turntable 3 are in a stable centered state. After positioning, in order to further ensure the stability of the screw 16, the positioning pin 26 is inserted through the second positioning block 25 and embedded in the cavity of the positioning hole 27 at the corresponding position, so as to further lock the screw 16 after rotation. When operating manually, the ball 7 at the end of the straight extension arm 6 is placed against the outer wall of the blow-molded product 4, and the ball 7 at the end of the hook-shaped extension arm 6 is placed against the inner wall of the blow-molded product 4, so that the ball 7 at each position is tightly fitted to the corresponding side wall of the blow-molded product 4 under the elastic force of the corresponding spring 9. After the stepper motor 15 is started, it drives the turntable 3 to rotate synchronously with the blow-molded product 4. If there is unevenness in the outer wall of the blow-molded product 4, the ball 7 at the corresponding position will be pushed during the rotation, causing the extension arm 6 to move outward relative to the support arm 5. This will cause the marker pen 10 positioned at the positioning seat 8 to leave a linear mark on the marking plate 13, thereby indicating that there is unevenness in the side wall of the blow-molded product 4. Furthermore, the mark status of the corresponding marker pen 10 can be detected on the inner and outer sides of the blow-molded product 4 to determine whether there is unevenness on the inner or outer side of the blow-molded product 4. If the marker pen 10 at each point leaves a dotted mark on the corresponding marking plate 13 when the blow-molded product 4 rotates, it indicates that the inner and outer walls of the blow-molded product 4 are in a uniform state, that is, the blow-molded product 4 is a qualified finished product with uniform circumferential thickness. This utility model has several significant advantages: First, by using the rotation of the blow-molded product 4 in conjunction with separate detection of its inner and outer diameters, the uniformity of the circumferential wall thickness of the blow-molded product 4 can be directly presented. Inspectors can quickly judge the quality without complex data analysis, greatly improving inspection efficiency. It also avoids the limitations of single-point inspection, accurately identifies hidden defects such as partial compliance but overall deformation, reduces the risk of defective products leaving the product, and ensures comprehensive and accurate inspection, providing support for quality control. Second, relying on the same elastic drive principle to achieve thickness detection of the blow-molded product 4 ensures the consistency and reliability of inner and outer wall detection. Furthermore, the differentiated structure adapts to different inspection scenarios, simplifying the mechanism design logic, reducing the difficulty of component adaptation, facilitating later maintenance and debugging, and improving the versatility and practicality of the device. Third, the positioning bolt 11, the first positioning block 12, and the positioning seat 8 work together to achieve vertical positioning of the marking pen 10, eliminating posture deviation. The distortion caused by the traces ensures that the trace information truly reflects the outer wall thickness of the blow-molded product 4, laying the foundation for accurate detection. Furthermore, the position of the marker pen 10 can be flexibly adjusted and replaced, ensuring repeatability of the equipment. Fourth, the internal support structure provides a stable and accurate positioning reference for the blow-molded product 4, preventing it from shifting during detection and ensuring data accuracy. Simultaneously, the non-interference layout allows for independent and smooth detection of the inner and outer walls, eliminating the need for frequent component adjustments, improving detection efficiency, and reducing surface damage to the blow-molded product 4 and wear on detection components. Fifth, the screw 16, drive rod 18, and internal support block 20 work together to achieve precise centered positioning of the blow-molded product 4, ensuring that the turntable 3 and the blow-molded product 4 rotate synchronously in the center, eliminating detection misalignment caused by asynchronous rotation, and enabling multiple detection components to stably collect data. This improves efficiency and avoids detection errors caused by positional deviations, ensuring consistency and reliability of results during batch testing.

[0034] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0035] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0036] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0037] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0038] Unless otherwise stated, the term "multiple" means two or more.

[0039] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0040] The term "and / or" describes the relationship between objects, indicating that there can be three relationships. For example, A and / or B means: A or B, or A and B.

[0041] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for detecting the wall thickness uniformity of a blow molded product, comprising a processing platform (1) having a circular through slot in the middle, and four vertical columns (2) respectively installed at the four corners of the bottom end of the processing platform (1), characterized in that: Also includes: Turntable (3), the turntable (3) is rotatably disposed in the inner cavity of the circular through groove in the middle of the processing platform (1); Blow-molded product (4), the blow-molded product (4) is centrally positioned on the turntable (3) by an inner support unit; A detection component is disposed at the blow-molded product (4) and is used to detect the thickness uniformity of the blow-molded product (4); The detection component includes: Support arm (5), which is vertically mounted on the processing platform (1); An extension arm (6) slides through the top of the support arm (5); A sphere (7) is mounted on one end of the extension arm (6) and the sphere (7) is in close contact with the side wall of the blow-molded product (4); Positioning seat (8), which is mounted on the other end of the extension arm (6); Spring (9), the spring (9) is sleeved on the ball (7), and the two ends of the spring (9) are fixedly connected to the side wall of the support arm (5) and the side wall of the positioning seat (8), respectively; A marker pen (10) is positioned vertically within the cavity of the positioning seat (8); Marking plate (13) is installed on the processing platform (1) and is located below the marking pen (10).

2. The device for detecting the wall thickness uniformity of blow-molded products according to claim 1, characterized in that: The marker pen (10) is positioned within the cavity of the spring (9) via a locking assembly, the locking assembly comprising: Positioning bolt (11), the positioning bolt (11) is threaded and rotatably passes through the positioning seat (8); The first positioning block (12) is installed at one end of the positioning bolt (11) inserted into the inner cavity of the positioning seat (8), and the first positioning block (12) is in close contact with the side wall of the marking pen (10) to realize the positioning of the marking pen (10) in the inner cavity of the positioning seat (8).

3. The device for detecting the wall thickness uniformity of blow-molded products according to claim 1, characterized in that: The detection components are respectively disposed on the inner and outer sides of the blow-molded product (4) for detecting the contact between the ball (7) of the detection component on the outer side of the blow-molded product (4) and the outer wall of the blow-molded product (4); and for detecting the contact between the ball (7) of the detection component on the inner side of the blow-molded product (4) and the inner wall of the blow-molded product (4).

4. The device for detecting the uniformity of wall thickness of blow-molded products according to claim 3, characterized in that: The extension arm (6) of the detection assembly used to detect the inner wall of the blow-molded article (4) adopts a telescopic structure that can extend and retract in the vertical direction.

5. The device for detecting the uniformity of wall thickness of blow-molded products according to claim 1, characterized in that: A drive assembly is provided below the turntable (3), the drive assembly including: Motor frame (14); A stepper motor (15) is mounted on the motor frame (14), and the output end of the stepper motor (15) is connected to the middle of the lower surface of the turntable (3).

6. The device for detecting the wall thickness uniformity of blow-molded products according to claim 1, characterized in that: The internal support unit includes: The screw (16) is rotatably mounted on the middle of the upper surface of the turntable (3) via an embedded bearing; Sleeve (17), which is threaded onto the screw (16); The drive rod (18) is provided in multiple sets, and one end of each set of the drive rod (18) is rotatably connected to the side wall of the sleeve (17); Connecting seat (19), which is rotatably connected to the other end of the drive rod (18); An inner support block (20) is installed on the side wall of the connecting seat (19), and the side wall of the inner support block (20) abuts against the inner side wall of the blow-molded product (4).

7. The device for detecting the wall thickness uniformity of blow-molded products according to claim 6, characterized in that: The internal support unit also includes: A fixing plate (21) is fixedly installed on the turntable (3) along the radial direction of the turntable (3); Guide rod (22), the guide rod (22) is installed in the cavity of the fixed plate (21) along the radial direction of the turntable (3); The slider (23) is fixedly installed at the bottom end of the inner support block (20), and the slider (23) is slidably sleeved on the guide rod (22).

8. The device for detecting the wall thickness uniformity of blow-molded products according to claim 6, characterized in that: The inner support block (20) is configured with an arc-shaped structure on one side of the inner wall of the blow-molded product (4).

9. The device for detecting the wall thickness uniformity of blow-molded products according to claim 6, characterized in that: The bottom end of the screw (16) is provided with a plug-in structure, the plug-in structure including: Rotating plate (24), the rotating plate (24) is fixedly installed at the bottom end of the screw (16); The second positioning block (25) is fixedly installed on the side wall of the rotating plate (24); Positioning pin (26), which penetrates the second positioning block (25) in a vertical direction; Positioning holes (27) are provided in multiple sets. The multiple sets of positioning holes (27) are respectively opened through the upper surface of the turntable (3), and the bottom end of the positioning pin (26) is inserted into the inner cavity of one of the positioning holes (27).

10. The device for detecting the uniformity of wall thickness of blow-molded products according to claim 9, characterized in that: The multiple sets of positioning holes (27) are arranged circumferentially at equal intervals with the vertical center line of the screw (16) as the axis.

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