Roller speed reducer for plastic stretching

Abstract

The invention relates to the technical field of plastic stretching, in particular to a roller speed reduction device for plastic stretching. Which comprises a main body, a roller device, a compression roller device, an irradiation device, a monitoring device and a control execution unit, and is characterized in that the control execution unit is connected with the monitoring device and comprises a rotation speed ratio determination module used for determining the rotation speed ratio between corresponding rollers according to the thickness of a qualified plastic product needing to be obtained; the image acquisition module is used for acquiring an image of the surface of the plastic product between the roller groups; the image analysis module is used for analyzing the image of the surface of the plastic product in real time; the execution judgment module is used for determining whether the rotation speed ratio between the rollers is qualified or not according to the light transmittance; the regulation and control module is used for determining an adjustment strategy for the roller device or the compression roller device according to the uniformity of the light transmittance; and the optimization regulation and control module is used for determining an optimization strategy for the adjustment strategy according to the variation of the light transmittance uniformity. The problem of roller set speed reduction in the plastic stretching process is solved.

Description

Technical Field

[0001] This invention relates to the field of plastic stretching and forming technology, and more particularly to a roller deceleration device for plastic stretching. Background Technology

[0002] In the field of plastic molding technology, plastic stretching is a key process in the production of various plastic products. As one of the core components of plastic stretching equipment, the rotation speed of the roller directly affects the uniformity of the thickness and width of the plastic products. To effectively control the roller speed and enable it to adapt to stretching processes under different thickness and width conditions, a speed reduction device plays a crucial role.

[0003] Currently, common plastic stretching roller speed reduction devices on the market have the following shortcomings: First, traditional speed reduction devices have low transmission efficiency and high energy loss, which not only increases the energy consumption of the equipment but may also lead to heat accumulation during long-term operation, thus affecting the stability and service life of the equipment. Second, some speed reduction devices have complex structures and numerous parts, making the installation, debugging, and subsequent maintenance of the equipment cumbersome and costly. Once a failure occurs, the repair time is long, affecting the production schedule. Third, some existing speed reduction devices are not flexible enough in adjusting the reduction ratio, making it difficult to meet the precise control requirements for subtle changes in roller speed during plastic stretching. Especially when processing plastic raw materials of different thicknesses and widths, they cannot achieve the best stretching effect, easily leading to problems such as uneven thickness, insufficient stretching, or over-stretching of plastic products, thereby affecting product quality and yield.

[0004] Chinese Patent Publication No. CN117021551A discloses a stretching and shaping device for anti-deformation processing of packing straps, relating to the field of packing strap processing. The device includes a machine plate, a first steel wheel, a second steel wheel, and a third steel wheel, all located on the front side of the machine plate. The first and third steel wheels are symmetrically distributed left and right. The second steel wheel is located below the middle of the first and third steel wheels. A first rotating shaft, a second rotating shaft, and a third rotating shaft are fixedly installed on the rear side of each of the first, second, and third steel wheels, respectively. The rear ends of each of the first, second, and third rotating shafts are rotatably connected to the machine plate via a first bearing. A drive mechanism for rotating the third steel wheel is provided on the rear side of the machine plate. This invention can effectively stretch and shape packing straps, preventing deformation and bending, thus avoiding problems in subsequent use. Furthermore, during the stretching and shaping process, the compression and stretching effect on the packing straps is easily adjustable, making it convenient for users.

[0005] Therefore, it can be seen that the aforementioned stretching and shaping device for preventing deformation of packing straps has the following problems:

[0006] The stretching process lacked a multi-stage roller device to stretch the strapping that needed to be stretched and shaped. Furthermore, the stretching status of the strapping on the steel wheel was not monitored in real time during the stretching process. As a result, the operating parameters of the steel wheel could not be dynamically adjusted according to the stretching status of the strapping, leading to uneven thickness of the strapping after stretching and failing to meet production requirements. Summary of the Invention

[0007] To address this issue, the present invention provides a roller deceleration device for plastic stretching, which overcomes the problem in the prior art that the stretching state of the packing strap on the steel wheel is not detected in real time, and the operating parameters of the steel wheel cannot be dynamically adjusted according to the stretching state of the packing strap, resulting in uneven thickness of the packing strap after stretching and the quality failing to meet production requirements.

[0008] To achieve the above objectives, the present invention provides a roller deceleration device for plastic stretching, comprising:

[0009] The main body includes a first main body, a second main body, a third main body, a fourth main body, and a fifth main body for mounting the roller assembly;

[0010] A roller assembly comprising a plurality of roller groups disposed on one side of the main body and rotatably connected to the main body for stretching plastic articles;

[0011] A pressure roller device, comprising a plurality of pressure rollers disposed on the upper part of a plurality of roller groups and rotatably connected to the plurality of roller groups for pressing plastic products on the plurality of roller groups.

[0012] An irradiation device comprising a plurality of lamp bodies disposed at the lower part between a plurality of bodies for generating a parallel light source for irradiating a plastic article during the stretching process.

[0013] The monitoring device includes a first optical camera disposed on the side of the first main body near the second main body for capturing images of the surface of the plastic product during the stretching process, and a second optical camera disposed on the side of the second main body near the third main body for capturing images of the surface of the plastic product during the stretching process.

[0014] A control execution unit, connected to the monitoring device, includes:

[0015] The speed ratio determination module is used to determine the appropriate speed ratio between the rollers based on the required thickness of the qualified plastic product.

[0016] The image acquisition module is used to acquire images of the surface of the plastic product between several roller groups during the stretching process in real time, captured by the first optical camera and the second optical camera.

[0017] Image analysis module, used to analyze images of the surface of plastic products in real time;

[0018] The execution judgment module is used to determine whether the rotational speed ratio between the rollers is qualified based on the light transmittance during the stretching process;

[0019] The control module is used to determine the adjustment strategy for the roller device or the pressure roller device based on the uniformity of light transmittance of the plastic product during the stretching process.

[0020] An optimization and control module is used to determine an optimization strategy for the adjustment strategy based on the amount of change in transmittance uniformity.

[0021] Furthermore, the rotation speed ratio determination module determines the corresponding rotation speed ratio between the rollers based on the thickness of the qualified plastic product to be obtained after stretching.

[0022] Furthermore, the execution judgment module determines whether the rotational speed ratio between the rollers is qualified based on the comparison between the light transmittance of the plastic product during the first stretching process and the second stretching process and the preset light transmittance, which is analyzed in real time.

[0023] Furthermore, the control module determines the adjustment strategy for the roller device or the pressure roller device based on the comparison result of the light transmittance uniformity of multiple points on the surface of a plastic product during the second or third stretching process with the preset uniformity.

[0024] The first adjustment strategy involves adjusting the pressure roller device.

[0025] Furthermore, the second adjustment strategy is to adjust the roller device.

[0026] Furthermore, the optimization and control module determines the optimization strategy for the adjustment strategy based on the comparison result of the change in the uniformity of light transmittance of the plastic product after the second stretching of the second roller group and the third stretching of the third roller group with the preset change.

[0027] The first optimization strategy is to reduce the inter-roller speed coefficient between the second roller group and the first roller group.

[0028] Furthermore, the second optimization strategy is to reduce the inter-roller speed coefficient between the third roller group and the second roller group.

[0029] Furthermore, the plurality of roller groups include a first roller group disposed on the first body and rotatably connected to the first body for stretching the plastic product for the first time, a second roller group disposed on the second body and rotatably connected to the second body for stretching the plastic product, a third roller group disposed on the third body and rotatably connected to the third body for stretching the plastic product, a fourth roller group disposed on the fourth body and rotatably connected to the fourth body for stretching the plastic product, and a fifth roller group disposed on the fifth body and rotatably connected to the fifth body for stretching the plastic product.

[0030] Furthermore, the plurality of pressure rollers include a first pressure roller disposed at the end of the first roller group and rotatably connected to the first roller group, a second pressure roller disposed at the end of the second roller group and rotatably connected to the second roller group, a third pressure roller disposed at the end of the third roller group and rotatably connected to the third roller group, and a fourth pressure roller disposed at the end of the fifth roller group and rotatably connected to the fifth roller group, which are used to press the plastic products on the roller device.

[0031] Furthermore, the plurality of lamp bodies include a first lamp body disposed on the side of the first body near the second body to generate a parallel light source to illuminate the plastic product between the first roller group and the second roller group, and a second lamp body disposed on the side of the second body near the third body to generate a parallel light source to illuminate the plastic product between the second roller group and the third roller group.

[0032] Compared with the prior art, the beneficial effects of the present invention are that, by setting the first roller group, the second roller group, the third roller group, the fourth roller group, and the fifth roller group on the first body, the second body, the third body, and the fifth body, multi-stage stretching can be achieved during the plastic stretching process, so that the plastic product can be stretched more slowly and more uniformly. This effectively avoids the problems of low precision and uneven stretching of the plastic product caused by the one-time molding of the plastic product by a single roller group. By controlling the multi-stage stretching process, the precision of the plastic product after molding is significantly improved, and the thickness of the stretched plastic product is more uniform.

[0033] Furthermore, by using a first lamp body positioned on the side of the first main body near the second main body to generate a parallel light source to illuminate the plastic product between the first roller group and the second roller group, and a second lamp body positioned on the side of the second main body near the third main body to generate a parallel light source to illuminate the plastic product between the second roller group and the third roller group, and in conjunction with a first optical camera positioned on the side of the first main body near the second main body to capture images of the surface of the plastic product during the stretching process, and a second optical camera positioned on the side of the second main body near the third main body to capture images of the surface of the plastic product during the stretching process, when the parallel light source illuminates the stretched plastic product, the first optical camera and the second optical camera can capture images of the surface of the plastic product, enabling real-time detection of the state parameters of the plastic product after stretching, and timely and precise adjustment of the working parameters of each roller group, so that the plastic product can meet the production needs after each stage of stretching.

[0034] Furthermore, by determining the appropriate speed ratio between rollers based on the required thickness of the plastic product before stretching, if the thickness of the qualified plastic product is relatively thin, the corresponding speed ratio between rollers is the first speed ratio; if the thickness of the qualified plastic product is relatively thick, the corresponding speed ratio between rollers is the second speed ratio. Determining the corresponding speed ratio before stretching can reduce the consumption of plastic raw materials due to adjusting the speed ratio during the stretching process, improve the stretching efficiency of the plastic product during the stretching process, and increase production capacity.

[0035] Furthermore, by real-time detection of the state parameters of the plastic product during the stretching process, the light transmittance of the plastic product during the stretching process can be extracted in a timely manner. Based on the comparison result of the light transmittance with the preset light transmittance, it can be determined whether the rotational speed ratio set between the rollers before stretching is qualified. If the condition is unqualified, the rotational speed of each roller group can be adjusted in a timely manner so that the light transmittance of the plastic product is consistent with the preset light transmittance, thereby meeting the production requirements of the plastic product.

[0036] Furthermore, by real-time detection of the light transmittance at multiple points on the plastic product during the stretching process, the light transmittance uniformity of a section of the plastic product can be obtained and compared with the preset uniformity to determine the corresponding adjustment strategy. Different adjustment strategies can meet the adjustment methods of the light transmittance uniformity of the plastic product under different conditions, which can effectively improve the product qualification rate.

[0037] Furthermore, by comparing the change in the uniformity of light transmittance of the stretched plastic product with the preset change, an optimization strategy for the adjustment strategy can be determined. This allows for timely optimization of the adjustment strategy based on the magnitude of the change, preventing excessive changes in the uniformity of light transmittance due to inaccurate adjustment strategies. By setting up two layers of strategies to monitor and adjust the state parameters of the plastic product during the stretching process, the thickness accuracy of the plastic product is significantly improved, resulting in higher efficiency, less scrap rate, and significantly reduced production costs. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the roller deceleration device for plastic stretching according to an embodiment of the present invention;

[0039] Figure 2 This is a functional connection block diagram of a roller deceleration device for plastic stretching according to an embodiment of the present invention;

[0040] Figure 3 This is a diagram illustrating the determination of whether the rotational speed ratio between rollers is qualified based on light transmittance in an embodiment of the present invention.

[0041] Figure 4 This is a judgment diagram showing how the adjustment strategy is determined based on transmittance uniformity in an embodiment of the present invention.

[0042] Figure 5 This is a judgment diagram for determining the optimization strategy based on the change in transmittance uniformity in an embodiment of the present invention.

[0043] In the diagram, 1 – First main body, 2 – Second main body, 3 – Third main body, 4 – Fourth main body, 5 – Fifth main body, 6 – First roller group, 7 – Second roller group, 8 – Third roller group, 9 – Fourth roller group, 10 – Fifth roller group, 11 – First pressure roller, 12 – Second pressure roller, 13 – Third pressure roller, 14 – Fourth pressure roller, 15 – First lamp body, 16 – Second lamp body, 17 – First optical camera, 18 – Second optical camera. Detailed Implementation

[0044] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0045] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0046] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0047] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] Please see Figure 1 As shown, it is a schematic diagram of the structure of the roller deceleration device for plastic stretching according to an embodiment of the present invention.

[0049] The present invention provides a roller deceleration device for plastic stretching, comprising:

[0050] The main body includes a first main body 1, a second main body 2, a third main body 3, a fourth main body 4, and a fifth main body 5 for setting up the roller assembly;

[0051] A roller device includes a first roller group 6 rotatably connected to the first main body 1 for stretching a plastic product for the first time; a second roller group 7 rotatably connected to the second main body 2 for stretching the plastic product stretched by the first roller group; a third roller group 8 rotatably connected to the third main body 3 for stretching the plastic product stretched by the second roller group 7; a fourth roller group 9 rotatably connected to the fourth main body 4 for stretching the plastic product stretched by the third roller group 8; and a fifth roller group 10 rotatably connected to the fifth main body 5 for stretching the plastic product stretched by the fourth roller group 9.

[0052] The pressure roller device includes a first pressure roller 11 rotatably connected to the first roller group 6 at its end, a second pressure roller 12 rotatably connected to the second roller group 7 at its end, a third pressure roller 13 rotatably connected to the third roller group 8 at its end, and a fourth pressure roller 14 rotatably connected to the fifth roller group 10 at its end, for pressing plastic products on the roller device;

[0053] An irradiation device includes a first lamp body 15 disposed on the side of the first main body 1 near the second main body 2 to generate a parallel light source to irradiate the plastic product between the first roller group 6 and the second roller group 7, and a second lamp body 16 disposed on the side of the second main body 2 near the third main body 3 to generate a parallel light source to irradiate the plastic product between the second roller group 7 and the third roller group 8.

[0054] The monitoring device includes a first optical camera 17 disposed on the side of the first main body 1 near the second main body 2 for capturing images of the surface of the plastic product during the stretching process, and a second optical camera 18 disposed on the side of the second main body 2 near the third main body 3 for capturing images of the surface of the plastic product during the stretching process.

[0055] Please see Figure 2 As shown, it is a functional connection block diagram of a roller deceleration device for plastic stretching according to an embodiment of the present invention.

[0056] A control execution unit, connected to the monitoring device, includes:

[0057] The speed ratio determination module is used to determine the appropriate speed ratio based on the required thickness of the qualified plastic product.

[0058] The image acquisition module is used to acquire images of the surface of the plastic product on the roller during the stretching process in real time, captured by the first optical camera 17 and the second optical camera 18.

[0059] An image analysis module, connected to the image acquisition module, is used to analyze in real time the image of the surface of the plastic product acquired in real time by the image acquisition module;

[0060] An execution judgment module is connected to the acceleration ratio prediction module and the image analysis module respectively, and is used to determine whether the inter-roller speed ratio is qualified based on the light transmittance during the stretching process;

[0061] The control module, which is connected to the execution judgment module, is used to determine the adjustment strategy for the roller device or the pressure roller device based on the uniformity of light transmittance of the plastic product during the stretching process.

[0062] An optimization control module, connected to the control module, is used to determine an optimization strategy for the adjustment strategy based on the change in transmittance uniformity.

[0063] In this embodiment of the invention, heated plastic raw materials are stirred and mixed to form a plastic state. This mixture is then extruded through a specific mold into various required strips, which are then wound around a multi-stage transmission roller device. By passing through the speed differences set by each transmission roller device, the product narrows from wide to the required size. Before stretching begins, the speed ratio determination module determines the corresponding speed ratio between the rollers based on the thickness of the qualified plastic product required after stretching.

[0064] If the thickness of the qualified plastic product is relatively thin, then the corresponding rotation speed ratio is determined as the first rotation speed ratio;

[0065] If the thickness of the qualified plastic product is relatively thick, then the corresponding rotation speed ratio is determined as the second rotation speed ratio;

[0066] Specifically, the thickness of qualified plastic products can be obtained according to actual production needs.

[0067] In this embodiment of the invention, if the thickness of the qualified plastic product is relatively thin, the first roller group 6 rotates at a speed of 60 r / min, the second roller group 7 rotates at a speed of 80 r / min, the third roller group 8 rotates at a speed of 100 r / min, the fourth roller group 9 rotates at a speed of 110 r / min, and the fifth roller group 10 rotates at a speed of 120 r / min. At this time, the speed ratio between the roller groups is 6:8:10:11:12, which is the first speed ratio. If the thickness of the qualified plastic product is relatively thick, the first roller group... Roller group 6 rotates at a speed of 80 r / min, the second roller group 7 rotates at a speed of 90 r / min, the third roller group 8 rotates at a speed of 110 r / min, the fourth roller group 9 rotates at a speed of 120 r / min, and the fifth roller group 10 rotates at a speed of 130 r / min. At this time, the speed ratio between the roller groups is 8:9:11:12:13, which is the second speed ratio. It is worth noting that the speed and speed ratio are preferred values ​​of the present invention. The preferred speed and preferred speed ratio can be determined according to the actual situation, and no specific limitation is made here.

[0068] Please continue reading. Figure 1As shown, in this embodiment of the invention, a specific mold extrudes plastic raw materials into various strip-shaped plastic products. The plastic products are then wound onto the first roller group 6 via a transmission mechanism. The first roller group 6 performs a first stretch on the strip-shaped plastic products. After the first stretch, the plastic products are wound onto the second roller group 7 via a transmission mechanism. The second roller group 7 performs a second stretch on the strip-shaped plastic products. After the second stretch, the plastic products are wound onto the third roller group 8 via a transmission mechanism. The third roller group 8 performs a third stretch on the strip-shaped plastic products. After the third stretch, the plastic products are wound onto the fourth roller group 9 via a transmission mechanism. The fourth roller group 9 performs a fourth stretch on the strip-shaped plastic products. After the fourth stretch, the plastic products are wound onto the fifth roller group 10 via a transmission mechanism. The fifth roller group 10 performs a fifth stretch on the strip-shaped plastic products to obtain the desired plastic product.

[0069] Specifically, during the process of the plastic product being stretched a second time by the second roller group 7 and then wound onto the third roller group 8, the first lamp body 16, located between the first roller group 6 and the second roller group 7, illuminates the plastic product from the bottom in parallel. Simultaneously, the first optical camera 17, located at the upper part between the first roller group 6 and the second roller group 7, captures a real-time image of the surface of the plastic product after the second stretch. During the process of the plastic product being stretched a third time by the third roller group 8 and then wound onto the fourth roller group 9, the second lamp body 16, located between the second roller group 7 and the third roller group 8, illuminates the plastic product from the bottom in parallel. Simultaneously, the second optical camera 18, located at the upper part between the second roller group 7 and the third roller group 8, captures a real-time image of the surface of the plastic product after the third stretch, and transmits the image to the image acquisition module.

[0070] Specifically, the image analysis module is connected to the image acquisition module and is used to analyze the light transmittance of the plastic product surface in real time by the image acquisition module.

[0071] Specifically, by setting the first roller group 6, the second roller group 7, the third roller group 8, the fourth roller group 9, and the fifth roller group 10 on the first main body 1, the second main body 2, the third main body 3, the fourth main body 4, and the fifth main body 5, multi-stage stretching can be achieved during the plastic stretching process. This allows the plastic product to be stretched more slowly and evenly, effectively avoiding the problems of low precision and uneven stretching of the plastic product caused by the single-stage molding of the plastic product by a single roller group. By controlling the multi-stage stretching process, the precision of the plastic product after molding is significantly improved, resulting in a more uniform thickness of the stretched plastic product.

[0072] Specifically, a first lamp body 15 is installed on the side of the first main body 1 near the second main body 2 to generate a parallel light source to illuminate the plastic product between the first roller group 6 and the second roller group 7, and a second lamp body 16 is installed on the side of the second main body 2 near the third main body 3 to generate a parallel light source to illuminate the plastic product between the second roller group 7 and the third roller group 8. These are complemented by a first optical camera 17 installed on the side of the first main body 1 near the second main body 2 to capture images of the surface of the plastic product during the stretching process, and a second optical camera 18 installed on the side of the second main body 2 near the third main body 3 to capture images of the surface of the plastic product during the stretching process. When the parallel light source illuminates the stretched plastic product, the first optical camera 17 and the second optical camera 18 can capture images of the surface of the plastic product, enabling real-time detection of the state parameters of the plastic product after stretching, and timely and precise adjustment of the working parameters of each roller, so that the plastic product can meet production needs after each stage of stretching.

[0073] Please see Figure 3 As shown, this is a judgment diagram for determining whether the rotational speed ratio between rollers is qualified based on the light transmittance in an embodiment of the present invention.

[0074] In this embodiment of the invention, the execution judgment module determines whether the rotational speed ratio between the rollers is qualified based on the comparison results of the light transmittance of the plastic product during the first stretching process and the second stretching process, which are analyzed in real time by the image analysis module, with a preset light transmittance.

[0075] If the light transmittance is equal to the preset light transmittance, then the rotational speed ratio between the rollers is deemed acceptable.

[0076] If the light transmittance is less than or greater than the preset light transmittance, then the rotational speed ratio between the rollers is determined to be unqualified.

[0077] The preset transmittance ranges from 20% to 30%, and the preferred value in this invention is 25%. The preferred range and preferred value of the preset transmittance can be determined according to the actual situation, and are not specifically limited here.

[0078] The transmittance is obtained by the image analysis module analyzing the image of the plastic product surface acquired in real time by the image acquisition module. In practical applications, firstly, without the plastic product, a background image is captured using the optical camera to record the original light intensity distribution of the parallel light source as a reference image. During the stretching process, the optical camera captures images of the plastic product after the second and third stretching as it passes through the parallel light source, recording the light intensity distribution after the parallel light source illuminates the plastic product as a sample image. The reference image and the sample image are preprocessed by converting them into grayscale images and then denoising them to reduce the impact of noise on the measurement results. The ratio of the light intensity of each pixel in the sample image to the light intensity of the corresponding pixel in the reference image is used as the transmittance of a single pixel. Finally, the average transmittance of the pixel light intensity in the entire sample image is calculated as the overall transmittance.

[0079] In this embodiment of the invention, the preset transmittance is set to 25%. During implementation, the roller speed ratio is determined to be qualified based on the comparison between the transmittance of the plastic product and the preset transmittance, which is analyzed in real time by the image analysis module. For example, if the transmittance is 20%, it meets the condition that the transmittance is less than the preset transmittance, indicating that the thickness of the plastic product after the second or third stretching is relatively thick and the transmittance of the plastic product is relatively low. In this case, the roller speed ratio is determined to be unqualified. Conversely, if the transmittance is 25%, it meets the condition that the transmittance is equal to the preset transmittance, indicating that the thickness of the plastic product after the second or third stretching meets the requirements of a qualified product. In this case, the roller speed ratio is determined to be qualified.

[0080] Specifically, by determining the appropriate speed ratio between rollers before stretching based on the required thickness of the plastic product, if the thickness of the qualified plastic product is relatively thin, the corresponding speed ratio between rollers is the first speed ratio; if the thickness of the qualified plastic product is relatively thick, the corresponding speed ratio between rollers is the second speed ratio. Determining the corresponding speed ratio before stretching can reduce the consumption of plastic raw materials due to adjusting the speed ratio during the stretching process, improve the stretching efficiency of the plastic product during the stretching process, and increase production capacity.

[0081] Please see Figure 4 As shown, it is a judgment diagram for determining the adjustment strategy based on the uniformity of light transmittance in an embodiment of the present invention.

[0082] Specifically, the control module determines the adjustment strategy for the roller device or the pressure roller device based on a comparison of the uniformity of light transmittance at multiple points on the surface of a plastic product during the second or third stretching process with a preset uniformity.

[0083] If the transmittance uniformity is less than or equal to the preset transmittance uniformity, then a first adjustment strategy for adjusting the pressure roller device is determined.

[0084] If the transmittance uniformity is greater than the preset transmittance uniformity, then a second adjustment strategy for adjusting the roller device is determined.

[0085] The preset transmittance uniformity ranges from 2 to 5, with a preferred value of 3 in this invention. The preferred range and value of the preset transmittance uniformity can be determined based on actual conditions and are not specifically limited here.

[0086] The transmittance uniformity is first calculated by using the standard deviation formula to determine the degree of deviation between the transmittance of each pixel in the sample image and the average transmittance. Then, the transmittance uniformity of the plastic product is obtained by using the ratio of the standard deviation to the average transmittance.

[0087] In this embodiment of the invention, the preset transmittance uniformity is set to 3. During implementation, the adjustment strategy for the roller device or the pressure roller device is determined based on the comparison between the transmittance uniformity of the plastic product during the second or third stretching process and the preset transmittance uniformity. For example, if the transmittance uniformity is set to 2, it indicates that the transmittance uniformity is less than the preset transmittance uniformity, signifying that although the transmittance uniformity is within the preset transmittance uniformity range, the transmittance uniformity has not yet reached complete uniformity. In this case, a first adjustment strategy for adjusting the pressure roller device is determined. For example, if the transmittance uniformity is set to 5, it indicates that the transmittance uniformity is greater than the preset transmittance uniformity, signifying that the transmittance uniformity of the plastic product is not within the preset transmittance uniformity range, and the transmittance uniformity is significantly different from complete uniformity. In this case, a second adjustment strategy for adjusting the roller device is determined.

[0088] Specifically, the first adjustment strategy is to adjust the pressure roller device by increasing the pressure of the second pressure roller 12 on the plastic product or the pressure of the third pressure roller 13 on the plastic product, which is set on the second roller group 7. The increase range is 1.1-1.5 times the original working pressure. The present invention preferably increases it by 1.3 times, that is, the second pressure roller 12 or the third pressure roller 13 presses the plastic product with 1.3 times the original working pressure to meet the requirement of uniform light transmittance.

[0089] The second adjustment strategy involves adjusting the roller assembly by increasing the rotational speed of the first roller group 6 mounted on the first main body 1. The range of the increased stretching speed is 80-90 r / min, preferably 85 r / min. This means the first roller group 6 performs a second stretch on the plastic product at 85 r / min, preventing a large difference between the rotational speed of the first roller group 6 and the second roller group 7 during the stretching process, which could lead to low uniformity of light transmittance in the plastic product. The second adjustment strategy involves reducing the rotational speed of the third roller group mounted on the third main body 3. The rotational speed of roller 8 is reduced. The range of the stretching speed is 90-105 r / min. The present invention preferably increases the rotational speed to 95 r / min. That is, the third roller group 8 stretches the plastic product for the third time at a rotational speed of 95 r / min. This avoids the large difference between the rotational speed of the third roller group 8 and the rotational speed of the second roller group 7 during the stretching process, which would result in low light transmittance uniformity of the plastic product during the stretching process. Adjusting the rotational speed between the rollers to a reasonable working range allows the plastic product to be stretched more evenly during the second and third stretching processes, thus maintaining good light transmittance uniformity.

[0090] Specifically, by monitoring the light transmittance of multiple points on a plastic product in real time during the stretching process, the uniformity of light transmittance across a section of the plastic product can be obtained. This uniformity can be compared with a preset uniformity to determine the corresponding adjustment strategy. Different adjustment strategies can be developed to meet the needs of adjusting the uniformity of light transmittance of plastic products under different conditions, effectively improving the product qualification rate.

[0091] Please see Figure 5 As shown, it is a judgment diagram of the optimization strategy determined based on the change in transmittance uniformity in an embodiment of the present invention.

[0092] Specifically, the optimization and control module is connected to the control module, and determines the optimization strategy for the adjustment strategy based on the comparison result of the change in the uniformity of light transmittance of the plastic product after the second stretching of the second roller group 7 and the third stretching of the third roller group 8 with the preset change amount, wherein,

[0093] If the change is less than or equal to the preset change, then the first optimization strategy for the adjustment strategy is determined;

[0094] If the change is greater than the preset change, then a second optimization strategy for the adjustment strategy is determined;

[0095] Wherein, the preset change amount is the absolute difference between the light transmittance uniformity of the plastic product after the third stretch and the light transmittance uniformity of the plastic product after the second stretch. The value range of the preset change amount is 0.4-0.9, and the preferred value in this invention is 0.7. The preferred value range and preferred value of the preset change amount can be determined according to the actual situation, and are not specifically limited here.

[0096] Wherein, the change is the absolute difference between the uniformity of light transmittance of the plastic product after the third stretch and the uniformity of light transmittance of the plastic product after the second stretch.

[0097] In this embodiment of the invention, the preset change amount is 0.7. During implementation, an optimization strategy for the adjustment strategy is determined based on a comparison between the change in the uniformity of light transmittance of the plastic product after the second stretching of the second roller group 7 and the third stretching of the third roller group 8 and the preset change amount. For example, when the change amount is 0.5, it meets the condition that the change amount is less than the preset change amount, indicating that the change in the uniformity of light transmittance of the plastic product after the third stretching is within a reasonable range compared to the change after the second stretching, and the difference in rotational speed between the third roller group 8 and the second roller group 7 is small. In this case, a first optimization strategy for the adjustment strategy is determined. Conversely, when the change amount is 1.0, it meets the condition that the change amount is greater than the preset change amount, indicating that the change in the uniformity of light transmittance of the plastic product after the third stretching is large compared to the change after the second stretching, and the difference in rotational speed between the third roller group 8 and the second roller group 7 is large. In this case, a second optimization strategy for the adjustment strategy is determined.

[0098] Specifically, the first optimization strategy is to adjust the inter-roller speed coefficient between the second roller group 7 and the first roller group 6, that is, to reduce the inter-roller speed coefficient between the first roller group 6 and the second roller group 7. The reduction range is 0.15-0.35 times the speed of the first roller group 6. The present invention preferably reduces the value to 0.2, that is, the speed of the second roller group 7 is reduced by 0.2 times the speed of the first roller group 6. In practice, if the speed of the first roller group 6 is 80 r / min and the speed of the second roller group 7 is 100 r / min, the speed reduction is 80 r / min × 0.2, that is, 16 r / min. At this time, the speed of the second roller group 7 is reduced to 84 r / min. The speed of the second roller group 7 is reduced, therefore, the inter-roller speed coefficient between the first roller group 6 and the second roller group 7 is reduced.

[0099] The second optimization strategy is to adjust the inter-roller speed coefficient between the third roller group 8 and the second roller group 7, that is, to reduce the inter-roller speed coefficient between the third roller group 8 and the second roller group 7. The reduction range is 0.1-0.25 times the speed of the second roller group 7. In this invention, the reduction value is preferably 0.15, that is, the speed of the third roller group 8 is reduced by 0.15 times the speed of the second roller group 7. In implementation, if the speed of the second roller group 7 is 100 r / min and the speed of the third roller group 8 is 120 r / min, the speed reduction is 100 r / min × 0.15, that is, 15 r / min. At this time, the speed of the third roller group 8 is reduced to 105 r / min. The speed of the third roller group 8 is reduced, therefore, the inter-roller speed coefficient between the second roller group 7 and the third roller group 8 is reduced.

[0100] The roller rotation speed coefficient is the rotation speed multiple between the next roller group and the previous roller group.

[0101] Specifically, by comparing the change in the uniformity of light transmittance of the stretched plastic product with the preset change, an optimization strategy for the adjustment strategy is determined. This allows for timely optimization of the adjustment strategy based on the magnitude of the change, preventing excessive changes in the uniformity of light transmittance due to inaccurate adjustment strategies. By setting up two layers of strategies to monitor and adjust the state parameters of the plastic product during the stretching process, the thickness accuracy of the plastic product is significantly improved, resulting in higher efficiency, less scrap rate, and significantly reduced production costs.

[0102] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A roller deceleration device for plastic stretching, characterized in that, include, The main body includes a first main body, a second main body, a third main body, a fourth main body, and a fifth main body for mounting the roller assembly; A roller assembly comprising a plurality of roller groups disposed on one side of the main body and rotatably connected to the main body for stretching plastic articles; A pressure roller device, comprising a plurality of pressure rollers disposed on the upper part of a plurality of roller groups and rotatably connected to the plurality of roller groups for pressing plastic products on the plurality of roller groups. An irradiation device comprising a plurality of lamp bodies disposed at the lower part between a plurality of bodies for generating a parallel light source for irradiating a plastic article during the stretching process. The monitoring device includes a first optical camera disposed on the side of the first main body near the second main body for capturing images of the surface of the plastic product during the stretching process, and a second optical camera disposed on the side of the second main body near the third main body for capturing images of the surface of the plastic product during the stretching process. A control execution unit, connected to the monitoring device, includes: The speed ratio determination module is used to determine the appropriate speed ratio between the rollers based on the required thickness of the qualified plastic product. The image acquisition module is used to acquire images of the surface of the plastic product between several roller groups during the stretching process in real time, captured by the first optical camera and the second optical camera. Image analysis module, used to analyze images of the surface of plastic products in real time; The execution judgment module is used to determine whether the rotational speed ratio between the rollers is qualified based on the light transmittance during the stretching process; The control module is used to determine the adjustment strategy for the roller device or the pressure roller device based on the uniformity of light transmittance of the plastic product during the stretching process. An optimization and control module is used to determine an optimization strategy for the adjustment strategy based on the amount of change in transmittance uniformity.

2. The roller deceleration device for plastic stretching according to claim 1, characterized in that, The rotation speed ratio determination module determines the corresponding rotation speed ratio between the rollers based on the thickness of the qualified plastic product required after stretching.

3. The roller deceleration device for plastic stretching according to claim 2, characterized in that, The execution judgment module determines whether the rotational speed ratio between the rollers is qualified based on the comparison between the light transmittance of the plastic product during the first stretching process and the second stretching process and the preset light transmittance, which is analyzed in real time.

4. The roller deceleration device for plastic stretching according to claim 3, characterized in that, The control module determines the adjustment strategy for the roller device or the pressure roller device based on the comparison result of the light transmittance uniformity of multiple points on the surface of a plastic product during the second or third stretching process with the preset uniformity. The first adjustment strategy involves adjusting the pressure roller device.

5. The roller deceleration device for plastic stretching according to claim 4, characterized in that, The second adjustment strategy is to adjust the roller device.

6. The roller deceleration device for plastic stretching according to claim 5, characterized in that, The optimization and control module determines the optimization strategy for the adjustment strategy based on the comparison between the change in the uniformity of light transmittance of the plastic product after the second stretching of the second roller group and the third stretching of the third roller group and the preset change. The first optimization strategy is to reduce the inter-roller speed coefficient between the second roller group and the first roller group.

7. The roller deceleration device for plastic stretching according to claim 6, characterized in that, The second optimization strategy is to reduce the inter-roller speed coefficient between the third roller group and the second roller group.

8. The roller deceleration device for plastic stretching according to claim 1, characterized in that, The plurality of roller groups include a first roller group disposed on and rotatably connected to the first body for stretching a plastic article for the first time, a second roller group disposed on and rotatably connected to the second body for stretching a plastic article, a third roller group disposed on and rotatably connected to the third body for stretching a plastic article, a fourth roller group disposed on and rotatably connected to the fourth body for stretching a plastic article, and a fifth roller group disposed on and rotatably connected to the fifth body for stretching a plastic article.

9. The roller deceleration device for plastic stretching according to claim 8, characterized in that, The plurality of pressure rollers include a first pressure roller disposed at the end of the first roller group and rotatably connected to the first roller group, a second pressure roller disposed at the end of the second roller group and rotatably connected to the second roller group, a third pressure roller disposed at the end of the third roller group and rotatably connected to the third roller group, and a fourth pressure roller disposed at the end of the fifth roller group and rotatably connected to the fifth roller group, which are used to press plastic products on the roller device.

10. The roller reduction device for plastic stretching according to claim 9, characterized in that, The plurality of lamp bodies include a first lamp body disposed on the side of the first body near the second body for generating a parallel light source to illuminate the plastic product between the first roller group and the second roller group, and a second lamp body disposed on the side of the second body near the third body for generating a parallel light source to illuminate the plastic product between the second roller group and the third roller group.

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