A device for determining the apparent density of foamed plastics

Abstract

The utility model belongs to foamed plastics performance detection technical field especially relates to a foamed plastics apparent density measuring device, including work bench, measuring mechanism, image acquisition mechanism and control system. The foamed plastics apparent density measuring device, measuring mechanism is used for measuring the mass of foamed plastics sample, image acquisition mechanism can gather the three -dimensional image of sample, control system is electrically connected with measuring mechanism, image acquisition mechanism, can receive mass data, handle three -dimensional image to obtain sample volume, and according to " apparent density = mass / volume " formula calculation result, wherein image acquisition mechanism realizes the flexible adjustment of shooting height and angle through support, height adjusting block, angle adjusting block etc. Component, cooperate depth camera and light supplement lamp and promote image definition, control system can automatically complete focusing test, system calibration, size measurement, model creation and result output, improve the determination efficiency and precision, be suitable for the rapid detection of all kinds of foamed plastics apparent density.

Description

Technical Field

[0001] This utility model relates to the field of performance testing technology for foamed plastics, specifically to a device for measuring the apparent density of foamed plastics. Background Technology

[0002] Foamed plastics, with their excellent properties such as lightweight, heat insulation, and cushioning, are widely used in many fields such as packaging, construction, and aerospace. Apparent density, as a key physical performance indicator of foamed plastics, directly reflects the compactness of its internal structure and has a significant impact on the mechanical properties and heat insulation performance of the product. Therefore, accurately measuring the apparent density of foamed plastics is of great practical significance. Traditional methods for determining the apparent density of foamed plastics typically involve manually measuring the length, width, and height of the sample using tools such as rulers and calipers to calculate the volume, then weighing the sample using a balance, and finally calculating the result using the apparent density formula. However, this method has several drawbacks: manual measurement is susceptible to human error, especially for irregularly shaped samples, making measurement more difficult and accuracy hard to guarantee; the entire measurement process relies on manual operation, resulting in low efficiency and making it difficult to meet the testing needs of large batches of samples. With the development of technology, machine vision technology, with its non-contact, high-precision, and high-efficiency characteristics, has been increasingly widely used in industrial inspection, dimensional measurement, and other fields. Depth cameras, as important equipment in the field of machine vision, can quickly acquire three-dimensional image information of objects, providing strong support for the accurate measurement of object dimensions. Combining machine vision technology with automated metrology technology for the determination of the apparent density of foamed plastics is expected to overcome the shortcomings of traditional methods, achieve automation and high precision in the measurement process, and improve detection efficiency and the reliability of results. Therefore, the development of a device integrating a metrology mechanism, an image acquisition mechanism, and a control system, capable of automatically determining the apparent density of foamed plastics using machine vision technology, has become an urgent need in the industry. Utility Model Content

[0003] The purpose of this invention is to provide a device for measuring the apparent density of foamed plastics, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a device for measuring the apparent density of foamed plastics, comprising a worktable, a measuring mechanism, an image acquisition mechanism, and a control system; The measuring mechanism is set on the workbench and is used to support and measure the mass of the foam plastic sample; The image acquisition mechanism is mounted on the workbench and located above the metrology mechanism, and is used to acquire three-dimensional images of the sample. The control system is electrically connected to the metrology mechanism and the image acquisition mechanism, respectively, and is used to receive the mass data output by the metrology mechanism, process the three-dimensional image acquired by the image acquisition mechanism to obtain the volume data of the sample, and calculate the apparent density of the sample based on the mass data and the volume data.

[0005] Preferably, the measuring mechanism includes a weighing scale and a tray; the weighing scale is embedded in the top surface of the workbench, the tray is detachably placed on the weighing end of the weighing scale, and the top surface of the tray is used to support the sample.

[0006] Preferably, the image acquisition mechanism includes a bracket, a height adjustment block, an angle adjustment block, a connecting rod, and a depth measuring camera assembly. The bracket is vertically fixed to the top surface of the worktable and located on one side of the measurement mechanism. The height adjustment block is slidably connected to the bracket in the vertical direction and fixed to the bracket by a locking member. The angle adjustment block is rotatably connected to the side of the height adjustment block away from the bracket and the rotation angle is limited by a damping member. One end of the connecting rod is fixedly connected to the angle adjustment block, and the other end is fixedly connected to the depth measuring camera assembly, so that the lens of the depth measuring camera assembly faces the bearing surface of the measurement mechanism.

[0007] Preferably, the depth measuring camera assembly includes a depth camera and a fill light; the fill light is arranged around the outer periphery of the lens of the depth camera, and the illumination direction of the fill light is consistent with the shooting direction of the lens.

[0008] Preferably, the top surface of the workbench is provided with a closed cover; the closed cover is placed on the outside of the measuring mechanism and the image acquisition mechanism, and a sliding door is provided on one side of the cover; a light-shielding strip is provided on the inner side of the sliding door to seal the gap between the sliding door and the cover.

[0009] Preferably, the control system includes a processor, a memory, and a display screen; The memory stores an image processing program. When the processor executes the image processing program, it performs the following processing on the three-dimensional images acquired by the image acquisition mechanism: Perform focus tests to optimize image sharpness; Perform system calibration to eliminate shooting errors; Edge recognition and size calculation are performed on the image to obtain the length, width, and height data of the sample and calculate its volume; The processor is also used to receive mass data from the metrology agency, calculate the result according to the formula "apparent density = mass / volume", and output the volume, mass and apparent density data through the display screen.

[0010] Preferably, the top surface of the tray is provided with an anti-slip layer, which is made of silicone and has a grid-like texture on its surface.

[0011] Preferably, the height adjustment block has vertical scale lines, and the angle adjustment block has an angle scale, which is used to visually display the height and tilt angle of the depth camera component.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This foam plastic apparent density measuring device integrates the metrology mechanism and the image acquisition mechanism through the control system. It can automatically complete the processes of mass measurement, three-dimensional image acquisition, focusing test, system calibration, size calculation (length, width, height), volume and apparent density calculation, and result output, reducing manual intervention and significantly shortening the measurement time compared with the traditional manual measurement method. It is suitable for batch sample testing.

[0013] This foam plastic apparent density measuring device uses a depth camera assembly for image acquisition, along with a supplementary light to enhance light stability. It also uses height and angle adjustment blocks to precisely control the shooting parameters. Combined with system calibration, it eliminates shooting errors and ensures the clarity of the three-dimensional image and the accuracy of the size measurement. The metrology mechanism uses a weighing scale and a tray with an anti-slip layer, which not only ensures the accuracy of mass measurement but also avoids displacement or deformation of the sample during placement, further improving data reliability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure above the workbench of this utility model; Figure 3 This is a plan view of the overall structure of this utility model; Figure 4 This is a flowchart of the density measurement process of this utility model.

[0015] In the diagram: 1. Workbench; 2. Sliding door; 3. Weighing scale; 4. Tray; 5. Sample; 6. Support; 7. Height adjustment block; 8. Angle adjustment block; 9. Connecting rod; 10. Depth measuring camera assembly. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1-4This utility model provides a technical solution: a device for measuring the apparent density of foamed plastics, including a workbench 1, a measuring mechanism, an image acquisition mechanism, and a control system; The measuring mechanism is set on the workbench 1 and is used to support and measure the mass of the foam plastic sample 5; The image acquisition mechanism is installed on the workbench 1 and located above the metrology mechanism, and is used to acquire three-dimensional images of the sample 5. The control system is electrically connected to the metrology mechanism and the image acquisition mechanism respectively. It is used to receive the mass data output by the metrology mechanism, process the three-dimensional image acquired by the image acquisition mechanism to obtain the volume data of sample 5, and calculate the apparent density of sample 5 based on the mass data and volume data.

[0018] The measuring mechanism includes a weighing scale 3 and a tray 4; the weighing scale 3 is embedded in the top surface of the workbench 1, and the tray 4 is detachably placed on the weighing end of the weighing scale 3, and the top surface of the tray 4 is used to support the sample 5.

[0019] The image acquisition mechanism includes a bracket 6, a height adjustment block 7, an angle adjustment block 8, a connecting rod 9, and a depth measuring camera assembly 10. The bracket 6 is vertically fixed to the top surface of the worktable and located on one side of the metrology mechanism. The height adjustment block 7 is slidably connected to the bracket 6 in the vertical direction and is fixed to the bracket 6 by a locking member. The angle adjustment block 8 is rotatably connected to the side of the height adjustment block 7 away from the bracket 6 and the rotation angle is limited by a damping member. One end of the connecting rod 9 is fixedly connected to the angle adjustment block 8, and the other end is fixedly connected to the depth measuring camera assembly 10, so that the lens of the depth measuring camera assembly 10 faces the bearing surface of the metrology mechanism.

[0020] The depth camera assembly 10 includes a depth camera and a fill light; the fill light is arranged around the lens of the depth camera, and the illumination direction of the fill light is consistent with the shooting direction of the lens.

[0021] The top surface of the workbench 1 is provided with a closed cover; the closed cover is placed on the outside of the measuring mechanism and the image acquisition mechanism, and a sliding door 2 is provided on one side of the cover; a light-shielding strip is provided on the inner side of the sliding door 2 to seal the gap between the sliding door 2 and the cover.

[0022] The control system includes a processor, memory, and display screen; The memory stores an image processing program. When the processor executes the image processing program, it performs the following processing on the 3D images acquired by the image acquisition mechanism: Perform focus tests to optimize image sharpness; Perform system calibration to eliminate shooting errors; Edge recognition and size calculation are performed on the image to obtain the length, width, and height data of the sample and calculate its volume; The processor is also used to receive mass data from the metrology agency, calculate the result according to the formula "apparent density = mass / volume", and output the volume, mass and apparent density data through the display screen.

[0023] The top surface of tray 4 is equipped with an anti-slip layer made of silicone, and the surface has a grid pattern.

[0024] The height adjustment block 7 has vertical scale lines, and the angle adjustment block 8 has an angle scale, which are used to visually display the height and tilt angle of the depth camera assembly 10.

[0025] Working principle: The foam plastic sample is placed on the tray 4 of the measuring mechanism on the workbench 1. The weighing scale 3 measures the mass of the sample 5 and transmits the data to the control system. At the same time, the depth camera assembly 10 (with a surround light) in the image acquisition mechanism, whose position and angle can be adjusted by the height adjustment block 7 and the angle adjustment block 8, performs three-dimensional image acquisition on the sample 5 on the measuring mechanism. The acquired image is transmitted to the control system. The processor of the control system executes the image processing program to perform focus testing, system calibration, edge recognition and size calculation on the three-dimensional image to obtain the sample volume data. Combined with the received mass data, the apparent density of the sample is calculated according to the formula "apparent density = mass / volume". The volume, mass and apparent density data are output on the display screen. The closed cover on the top surface of the workbench 1 (with a sliding door 2 with a light-shielding strip) provides a stable acquisition environment, and the silicone anti-slip layer (with a grid pattern) on the top surface of the tray 4 prevents the sample from sliding.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A device for measuring the apparent density of foamed plastics, comprising a worktable (1), a measuring mechanism, an image acquisition mechanism, and a control system, characterized in that: The measuring mechanism is set on the workbench (1), the image acquisition mechanism is installed on the workbench (1) and located above the measuring mechanism, and the control system is electrically connected to the measuring mechanism and the image acquisition mechanism respectively; The measuring mechanism includes a weighing scale (3) and a tray (4); the weighing scale (3) is embedded in the top surface of the workbench (1), the tray (4) is detachably placed on the weighing end of the weighing scale (3), and the top surface of the tray (4) is used to support the sample (5). The image acquisition mechanism includes a bracket (6), a height adjustment block (7), an angle adjustment block (8), a connecting rod (9), and a depth measuring camera assembly (10). The bracket (6) is vertically fixed to the top surface of the workbench and located on one side of the measuring mechanism. The height adjustment block (7) is slidably connected to the bracket (6) in the vertical direction and is fixed to the bracket (6) by a locking member. The angle adjustment block (8) is rotatably connected to the side of the height adjustment block (7) away from the bracket (6) and the rotation angle is limited by a damping member. One end of the connecting rod (9) is fixedly connected to the angle adjustment block (8), and the other end is fixedly connected to the depth measuring camera assembly (10). The depth camera assembly (10) includes a depth camera and a fill light; the fill light is arranged around the lens of the depth camera, and the illumination direction of the fill light is consistent with the shooting direction of the lens; The top surface of the workbench (1) is provided with a closed cover; the closed cover is placed on the outside of the measuring mechanism and the image acquisition mechanism, and a sliding door (2) is provided on one side of the cover; a light-shielding strip is provided on the inside of the sliding door (2); The control system includes a processor, a memory, and a display screen; The memory stores an image processing program. When the processor executes the image processing program, it performs the following processing on the three-dimensional images acquired by the image acquisition mechanism: Perform focus tests to optimize image sharpness; Perform system calibration to eliminate shooting errors; Edge recognition and size calculation are performed on the image to obtain the length, width, and height data of the sample and calculate its volume; The processor is also used to receive mass data from the metrology agency, calculate the result according to the formula "apparent density = mass / volume", and output the volume, mass and apparent density data through the display screen. The top surface of the tray (4) is provided with an anti-slip layer, which is made of silicone and has a grid pattern on the surface; The height adjustment block (7) has a scale line along the vertical direction, and the angle adjustment block (8) has an angle scale.

Images