Manufacturing device and method for plastic-coated writing pen
By using plastic coating preparation equipment to spray primer, melt plastic coating, and cool the writing pen, the problems of hardness and paint peeling of traditional wooden pens are solved, improving user comfort and safety, while also enabling efficient and automated detection of defective products.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- BINZHOU PSL PENCIL CO LTD
- Filing Date
- 2025-11-13
- Publication Date
- 2026-07-23
AI Technical Summary
Traditional wooden writing pens are hard, making them uncomfortable to use. The paint coating is prone to peeling and poses health risks. Manual inspection of defective products is costly and inefficient.
The plastic coating preparation equipment includes a writing pen transport device, a coating device, a baking device, a cooling device, and a controller. Through spraying a primer, melting a plastic coating, and cooling treatment, the writing pen is fully covered with plastic.
It improves the comfort and safety of writing pens, and reduces the cost and false detection rate of manual inspection of defective products.
Smart Images
Figure CN2025134633_23072026_PF_FP_ABST
Abstract
Description
Equipment and methods for preparing plastic-coated writing pens Technical Field
[0001] The embodiments disclosed herein relate to the field of plastic-coated writing pen manufacturing technology, specifically to equipment and methods for manufacturing plastic-coated writing pens. Background Technology
[0002] A writing pen is a tool widely used for writing and drawing. Currently, most writing pens on the market are made of wood and coated with paint.
[0003] However, the following technical problems usually arise when using this type of writing pen:
[0004] First, traditional wooden writing pens are relatively hard, and prolonged use may cause calluses on the user's hands, resulting in lower comfort. Furthermore, the paint coating on the outer layer of these pens is often prone to peeling off, and if swallowed by children, it could harm their health.
[0005] Secondly, currently, when producing writing pens, defective writing pens are often removed from the production line by manual visual inspection. This method is labor-intensive, time-consuming, and prone to omissions.
[0006] The information disclosed in this background section is only intended to enhance the understanding of the background of the inventive concept, and therefore may contain information that does not constitute prior art known to those skilled in the art. Summary of the Invention
[0007] The summary portion of this disclosure is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description portion. This summary portion is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.
[0008] Some embodiments of this disclosure provide apparatus and methods for preparing plastic-coated writing pens to solve one or more of the technical problems mentioned in the background section above.
[0009] In a first aspect, some embodiments of this disclosure provide a plastic-coated writing pen manufacturing apparatus, including a writing pen transport device, a coating device, a baking device, a cooling device, and a controller. The writing pen transport device includes an uncoated writing pen conveyor belt, a primer-coated writing pen conveyor belt, a molten plastic-coated writing pen conveyor belt, and a coated writing pen conveyor belt. The uncoated writing pen conveyor belt and the primer-coated writing pen conveyor belt are aligned and connected, as are the molten plastic-coated writing pen conveyor belt and the coated writing pen conveyor belt. The coating device includes a primer-coating device and a molten plastic-coating device. The primer-coating device is disposed above the uncoated writing pen transport device, and the molten plastic-coating device is located between the baking device and the cooling device. The baking device is configured to dry the writing pen coated with the primer coating, and the primer-coated writing pen conveyor belt passes through the baking device. The cooling device... The apparatus is configured to cool writing pens coated with a molten plastic coating, the conveyor belt of the molten plastic coated writing pens passing through the cooling apparatus; the writing pen conveyor, the coating apparatus, the baking apparatus, the cooling apparatus, and the controller are communicatively connected, the controller being configured to perform the following steps: controlling the primer coating apparatus to perform a primer spraying operation on the writing pens on the uncoated writing pen conveyor belt; controlling the baking apparatus to perform a coating drying treatment on the writing pens on the primer coated writing pen conveyor belt; controlling the molten plastic coating apparatus to perform a molten plastic coating treatment on the writing pens after the coating drying treatment, and moving the writing pens after the molten plastic coating treatment onto the molten plastic coated writing pen conveyor belt; controlling the cooling apparatus to perform a coating cooling treatment on the writing pens on the molten plastic coated writing pen conveyor belt; and controlling the coated writing pen conveyor belt to transport the cooled writing pens.
[0010] Optionally, the equipment for preparing plastic-coated writing pens further includes a heating device and a molten plastic transfer device. The heating device includes a heating container with a solid plastic inlet, a pigment inlet, and a molten plastic outlet. The silicone spraying transfer device includes a molten plastic transfer pipe and pipe insulation material. The pipe insulation material is wrapped around the outside of the molten plastic transfer pipe, and the molten plastic transfer pipe is threadedly connected to the molten plastic outlet.
[0011] Optionally, the controller is further configured to perform the following steps: controlling the heating container in the heating device to heat and stir the solid plastic and color paste conveyed by the solid plastic inlet and the color paste inlet, and outputting the stirred molten plastic through the molten plastic outlet.
[0012] Optionally, the aforementioned molten plastic coating device includes a spraying track and a spray gun. The spraying track is connected to the primer coating pen conveyor belt and the molten plastic coating conveyor belt, respectively. The spray gun is suspended above the molten plastic conveyor belt and is threadedly connected to the molten plastic conveyor pipe. The controller controls the aforementioned molten plastic coating device to perform molten plastic coating treatment on the pen after the coating drying process by executing the following steps: and moves the pen after the molten plastic coating treatment to the molten plastic coating pen conveyor belt: controlling the spray gun to perform molten plastic spraying operation on the pen on the spraying track.
[0013] Optionally, the aforementioned molten plastic coating apparatus includes a dipping container, a lifting perforated plate, and a gripping device. The lifting perforated plate is connected to the bottom of the dipping container via an electric push rod. The lifting perforated plate can move up and down within the dipping container. The dipping container is threadedly connected to the molten plastic conveying device and is used to hold the molten plastic conveyed by the molten plastic conveying device. The controller controls the aforementioned molten plastic coating apparatus to perform molten plastic coating treatment on the writing pen after the coating drying process by executing the following steps, and to move the writing pen after the molten plastic coating treatment onto the molten plastic coated writing pen conveyor belt: controlling the gripping device to move the writing pen after the coating drying process on the primer coated writing pen conveyor belt into the dipping container; controlling the lifting perforated plate in the dipping container to lift the writing pen in the dipping container upwards and lift it away from the molten plastic in the dipping container; controlling the gripping device to move the writing pen on the lifting perforated plate onto the molten plastic coated writing pen conveyor belt.
[0014] Optionally, the aforementioned molten plastic coating device includes a push-pull device and a drawing device. The drawing device includes a coating tank, a drawing hole inlet, and a drawing hole outlet. The drawing hole inlet and outlet are located at opposite ends of the coating tank. A rubber ring is fitted to the drawing hole outlet, and the rubber ring is sleeved and connected to the drawing hole outlet. A feed opening is located above the coating tank. The molten plastic transfer device is threadedly connected to the feed opening above the coating tank. The coating tank is used to hold molten plastic. The length of the drawing device is less than the length of a writing pen. The aforementioned control... The device controls the above-mentioned molten plastic coating apparatus to perform molten plastic coating treatment on the writing pen after the coating drying treatment by performing the following steps, and moves the writing pen after the molten plastic coating treatment onto the molten plastic coating writing pen conveyor belt: controlling the above-mentioned push-pull device to push the writing pen after the coating drying treatment on the primer coating writing pen conveyor belt from the above-mentioned extraction hole inlet into the above-mentioned paint tank; controlling the above-mentioned push-pull device to pull the writing pen from the above-mentioned extraction hole outlet, and moving the writing pen onto the above-mentioned molten plastic coating writing pen conveyor belt.
[0015] Optionally, the aforementioned plastic-coated writing pen manufacturing equipment further includes a defective product rejection device. This defective product rejection device is communicatively connected to the controller. The defective product rejection device includes a first laser rangefinder, a second laser rangefinder, a laser signal processor, and a robotic arm. The first and second laser rangefinders are respectively installed on both sides of the coated writing pen conveyor belt, facing each other, with a fixed distance between them. The robotic arm is positioned on either side of the coated writing pen conveyor belt. The defective product rejection device is configured to perform the following... Steps: In response to determining that the writing pen on the coated writing pen conveyor belt has passed the first laser rangefinder and the second laser rangefinder, laser measurement processing is performed on the writing pen on the coated writing pen conveyor belt by the first laser rangefinder and the second laser rangefinder to obtain measurement data; the measurement data is processed by the laser signal processor to obtain a writing pen length recognition result; in response to determining that the writing pen length recognition result meets the rejection condition, the writing pen length recognition result is sent to the controller; based on the received writing pen length recognition result, the robotic arm is controlled to perform a grasping operation corresponding to the writing pen length recognition result.
[0016] Secondly, some embodiments of this disclosure provide a method for preparing a plastic-coated writing pen, applied to the plastic-coated writing pen preparation equipment as described in the first aspect. The plastic-coated writing pen preparation equipment includes a writing pen transport device, a coating device, a baking device, a cooling device, and a controller. The writing pen transport device includes an uncoated writing pen conveyor belt, a primer-coated writing pen conveyor belt, a molten plastic-coated writing pen conveyor belt, and a coated writing pen conveyor belt. The coating device includes a primer coating device and a molten plastic coating device. The method includes: controlling the primer coating device to... The process involves: applying a primer to the writing pens on the uncoated writing pen conveyor belt; controlling the baking device to dry the primer-coated writing pen conveyor belt; controlling the molten plastic coating device to apply a molten plastic coating to the writing pens after the coating drying process; and moving the molten plastic-coated writing pens onto the molten plastic-coated writing pen conveyor belt; controlling the cooling device to cool the molten plastic-coated writing pen conveyor belt; and controlling the coated writing pen conveyor belt to transport the cooled writing pens.
[0017] Optionally, the aforementioned plastic-coated writing pen manufacturing equipment further includes a defective product rejection device. The defective product rejection device is communicatively connected to the aforementioned controller. The defective product rejection device includes a first laser rangefinder sensor, a second laser rangefinder sensor, a laser signal processor, and a robotic arm. The first laser rangefinder sensor and the second laser rangefinder sensor are respectively installed on both sides of the coated writing pen conveyor belt, facing each other. The distance between the first laser rangefinder sensor and the second laser rangefinder sensor is a fixed value. The robotic arm is positioned on either side of the coated writing pen conveyor belt. The method further includes: in response to determining that the writing pen on the coated writing pen conveyor belt has passed the first laser rangefinder and the second laser rangefinder, performing laser measurement processing on the writing pen on the coated writing pen conveyor belt using the first laser rangefinder and the second laser rangefinder to obtain measurement data; processing the measurement data using the laser signal processor to obtain a writing pen length recognition result; in response to determining that the writing pen length recognition result meets the rejection condition, sending the writing pen length recognition result to the controller; and controlling the robotic arm to perform a grasping operation corresponding to the writing pen length recognition result based on the received writing pen length recognition result.
[0018] Optionally, the aforementioned plastic-coated writing pen preparation equipment includes a label spraying device, which comprises a writing pen holder and a label sprayer. The method further includes: controlling the writing pen holder to grasp and fix the writing pens on the coated writing pen conveyor belt; controlling the label spraying device to perform a label spraying operation on the fixed writing pens; and controlling the writing pen holder to perform a fixation release operation after the label spraying operation.
[0019] Optionally, the aforementioned defective product rejection device further includes a camera and a rolling device. The camera is mounted directly above the coated writing pen conveyor belt, and the rolling device is mounted directly below the camera on the coated writing pen conveyor belt. The rolling device rotates the writing pens on the coated writing pen conveyor belt at an angle of 150 degrees each time. The method further includes: controlling the rolling device to rotate the writing pen three times in sequence; controlling the camera to take pictures of the writing pen after each rotation to obtain a writing pen image group; cropping the writing pen area in each writing pen image in the writing pen image group to obtain a cropped area image group; performing planar projection processing on each cropped area image in the cropped area image group to obtain a writing pen projection image group; matching the writing pen projection images in the writing pen projection image group pairwise to obtain matching information; performing stitching processing on the writing pen projection images in the writing pen projection image group based on the matching information to obtain a stitched writing pen image; determining whether the markings on the writing pen are skewed or missing and whether the coating on the writing pen is missing based on the stitched writing pen image; determining that the writing pen passes the appearance inspection in response to determining that the markings on the writing pen are skewed or missing or that the coating on the writing pen is missing; and determining that the writing pen passes the appearance inspection in response to determining that the markings on the writing pen are skewed or missing or that the coating on the writing pen is missing.
[0020] Optionally, the above-mentioned pairwise matching of the writing pen projection images in the above-mentioned writing pen projection image group to obtain matching information may include the following steps: selecting two writing pen projection images from the above-mentioned writing pen projection image group that have not been matched with each other, respectively as the target writing pen projection image and the reference writing pen projection image; and performing the following matching sub-steps using the target writing pen projection image and the reference writing pen projection image: selecting a grid region from the edge of the target writing pen projection image as the target grid region, wherein the shape of the target grid region is square; sequentially selecting grid regions in the reference writing pen projection image as reference grid regions to obtain a set of reference grid regions. Specifically, there are no gaps or overlaps between the reference grid regions in the aforementioned reference grid region set; the average value of each color value in each reference grid region in the aforementioned target grid region and the aforementioned reference grid region set is determined; the reference grid region with the smallest sum of the squares of the average value of each color value in the aforementioned reference grid region set and the average value of the color value in the aforementioned target grid region is selected as the preliminary matching reference grid; the sum of the squares of the average value of the color value in the aforementioned preliminary matching reference grid region and the average value of the color value in the aforementioned target grid region is determined as the reference average value; in response to determining that the aforementioned reference average value is less than or equal to a preset threshold, the center point coordinates of the aforementioned preliminary matching reference grid region and the aforementioned target region are added to the aforementioned matching information as a matching coordinate pair.
[0021] The various embodiments of this disclosure have the following beneficial effects: Plastic-coated writing pens prepared using the plastic-coated writing pen preparation equipment of some embodiments of this disclosure can improve user comfort and safety during use. Specifically, the reasons why related writing pens result in poor user comfort and low safety during use are: wooden writing pens are hard, and long-term use can easily cause calluses on the user's hands. Furthermore, the paint coating on the outer layer of the writing pen is often easily peeled off, which may harm the health of children if accidentally ingested. Based on this, the plastic-coated writing pen preparation of some embodiments of this disclosure includes a writing pen transport device, a coating device, a baking device, a cooling device, and a controller. The writing pen transport device includes an uncoated writing pen conveyor belt, a primer-coated writing pen conveyor belt, a molten plastic-coated writing pen conveyor belt, and a coated writing pen conveyor belt. The uncoated writing pen conveyor belt and the primer-coated writing pen conveyor belt are aligned and connected, as are the molten plastic-coated writing pen conveyor belt and the coated writing pen conveyor belt. The coating apparatus includes a primer coating apparatus and a molten plastic coating apparatus. The primer coating apparatus is positioned above the uncoated writing pen transport apparatus, and the molten plastic coating apparatus is located between the baking apparatus and the cooling apparatus. The baking apparatus is configured to dry the writing pen coated with the primer, and the primer-coated writing pen transport belt passes through the baking apparatus. The cooling apparatus is configured to cool the writing pen coated with the molten plastic, and the molten plastic coated writing pen transport belt passes through the cooling apparatus. The writing pen transport apparatus, the coating apparatus, the baking apparatus, the cooling apparatus, and the controller are communicatively connected. The controller is configured to perform the following steps: controlling the primer coating apparatus to perform a primer spraying operation on the writing pens on the uncoated writing pen transport belt; and controlling the baking apparatus to perform a coating drying treatment on the writing pens on the primer-coated writing pen transport belt. Therefore, by spraying a primer layer onto the unprocessed writing pen, the surface of the writing pen can be more easily coated with molten plastic. The aforementioned molten plastic coating device is controlled to perform molten plastic coating treatment on the writing pen after the coating drying process, and to move the writing pen after the molten plastic coating treatment onto the molten plastic coated writing pen conveyor belt. The aforementioned cooling device is controlled to perform coating cooling treatment on the writing pen on the molten plastic coated writing pen conveyor belt. Thus, the molten plastic coating on the surface of the writing pen is cooled and solidified through the cooling treatment. The aforementioned coated writing pen conveyor belt is controlled to transport the cooled writing pen. Therefore, by adding a layer of plastic to the surface of the untreated writing pen and then injection molding it, a complete outer coating of the writing pen can be achieved.Because of the inherent softness of plastic, this not only improves the feel when holding it, but also enhances user comfort and safety due to its environmentally friendly and non-toxic properties. Attached Figure Description
[0022] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and elements are not necessarily drawn to scale.
[0023] Figure 1 is a schematic diagram of the structure of some embodiments of the plastic-coated writing pen manufacturing device according to the present disclosure;
[0024] Figure 2 is a flowchart of some embodiments of the method for preparing a plastic-coated writing pen according to the present disclosure. Detailed Implementation
[0025] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.
[0026] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.
[0027] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.
[0028] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".
[0029] The names of messages or information exchanged between multiple devices in the embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of such messages or information.
[0030] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.
[0031] Figure 1 is a schematic diagram of some embodiments of the plastic-coated writing pen manufacturing apparatus of this disclosure. Figure 1 includes an uncoated writing pen conveyor belt 1, a primer-coated writing pen conveyor belt 2, a molten plastic-coated writing pen conveyor belt 3, a coated writing pen conveyor belt 4, a primer coating device 5, a molten plastic coating device 6, a baking device 7, and a cooling device 8.
[0032] In some embodiments, the above-described plastic-coated writing pen manufacturing equipment may include a writing pen transport device, a coating device, a baking device 7, a cooling device 8, and a controller. The writing pen transport device is used to transport the writing pens. This device may include an uncoated writing pen conveyor belt 1, a primer-coated writing pen conveyor belt 2, a molten plastic-coated writing pen conveyor belt 3, and a coated writing pen conveyor belt 4. The coating device may be a device for coating the surface of the writing pen. This device may include a primer coating device 5 and a molten plastic coating device 6. For example, both the primer coating device 5 and the molten plastic coating device 6 may be spray guns. The baking device 7 may be a device for drying the primer on the surface of the writing pen. For example, the baking device 7 may be an oven. The cooling device 8 may be a device for cooling and solidifying the molten plastic on the surface of the writing pen. For example, the cooling device 8 may be an air-cooled chiller. The controller may be a device for controlling other devices and machines. For example, the controller may be a microcontroller.
[0033] In some embodiments, the writing pen transport device includes an uncoated writing pen conveyor belt 1, a primer-coated writing pen conveyor belt 2, a molten plastic-coated writing pen conveyor belt 3, and a coated writing pen conveyor belt 4. The uncoated writing pen conveyor belt 1 and the primer-coated writing pen conveyor belt 2 are aligned and connected. The molten plastic-coated writing pen conveyor belt 3 and the coated writing pen conveyor belt 4 are aligned and connected.
[0034] In some embodiments, the coating apparatus includes a primer coating apparatus 5 and a molten plastic coating apparatus 6. The primer coating apparatus 5 is disposed above the uncoated writing pen transfer device 1. The molten plastic coating apparatus 6 is located between the baking apparatus 7 and the cooling apparatus 8.
[0035] In some embodiments, the baking device 7 is configured to dry a writing pen coated with a primer, the primer-coated writing pen conveyor 2 passing through the baking device 7.
[0036] In some embodiments, the cooling device 8 is configured to cool a writing pen coated with a molten plastic coating, and the conveyor belt 3 of the writing pen with the molten plastic coating passes through the cooling device 8.
[0037] In some embodiments, the writing pen transmission device, the coating device, the baking device 7, the cooling device 8, and the controller are communicatively connected. Here, the specific manner in which the writing pen transmission device, the coating device, the baking device 7, the cooling device 8, and the controller are communicatively connected is not limited. As an example, the specific manner can be a wireless connection or a wired connection. The wireless connection method may include, but is not limited to, 3G / 4G connection, WiFi connection, Bluetooth connection, WiMAX connection, Zigbee connection, UWB (ultra-wideband) connection, and other currently known or future known wireless connection methods.
[0038] In some embodiments, the controller is configured to perform the following steps:
[0039] The first step involves controlling the primer coating device 5 to perform a primer spraying operation on the writing pens on the uncoated writing pen conveyor belt 1. In practice, the primer coating device 5 can spray primer onto the writing pens on the uncoated writing pen conveyor belt 1. After passing through the primer coating device 5, the writing pens on the uncoated writing pen conveyor belt 1 directly enter the primer-coated writing pen conveyor belt 2.
[0040] The second step involves controlling the baking device 7 to perform a coating drying process on the writing pens on the primer-coated writing pen conveyor belt 2. In practice, the writing pens pass directly through the baking device 7 via the primer-coated writing pen conveyor belt 2, thereby completing the primer treatment.
[0041] The third step involves controlling the molten plastic coating device 6 to apply a molten plastic coating to the writing pens after the coating drying process, and then moving the pens to the molten plastic coating pen conveyor belt. In practice, the molten plastic coating device 6 can be a spray gun. The molten plastic coating device 6 can spray molten plastic onto the writing pens on the primer-coated writing pen conveyor belt 2. After passing through the molten plastic coating device 6, the writing pens on the primer-coated writing pen conveyor belt 2 directly enter the molten plastic coating writing pen conveyor belt 3.
[0042] The fourth step involves controlling the cooling device 8 to perform a coating cooling process on the writing pen on the molten plastic coating conveyor belt 3. In practice, the writing pen is cooled by passing through the cooling device 8 on the molten plastic coating conveyor belt 3.
[0043] The fifth step is to control the coated writing pen conveyor belt 4 to transport the cooled writing pen. Beneficial effects
[0044] Referring again to Figure 2, a process 200 is shown for some embodiments of the method for preparing a plastic-coated writing pen according to the present disclosure. The method for preparing a plastic-coated writing pen includes the following steps:
[0045] Step 201: Control the primer coating device to perform a primer spraying operation on the writing pen on the uncoated writing pen conveyor belt.
[0046] In some embodiments, the execution body of the plastic-coated writing pen preparation method (the plastic-coated writing pen preparation equipment shown in FIG. 1) can control the primer coating device to perform a primer spraying operation on the writing pens on the uncoated writing pen conveyor belt. The writing pen conveyor device may include an uncoated writing pen conveyor belt, a primer-coated writing pen conveyor belt, a molten plastic-coated writing pen conveyor belt, and a coated writing pen conveyor belt. The uncoated writing pen conveyor belt and the primer-coated writing pen conveyor belt can be aligned and connected. The molten plastic-coated writing pen conveyor belt and the coated writing pen conveyor belt can be aligned and connected. The coating device may include a primer coating device and a molten plastic coating device. The primer coating device may be disposed above the uncoated writing pen conveyor device. The molten plastic coating device may be located between the baking device and the cooling device. The baking device may be configured to dry the writing pens coated with the primer coating. The primer-coated writing pen conveyor belt can pass through the baking device. The aforementioned cooling device can be configured to cool a writing pen coated with a molten plastic coating. The conveyor belt for the molten plastic-coated writing pen can pass through the aforementioned cooling device. The writing pen conveyor, the coating device, the baking device, and the cooling device can be communicatively connected to the aforementioned controller.
[0047] As examples, the writing instruments mentioned above may include, but are not limited to: pencils, ballpoint pens, fountain pens, direct-liquid pens, and fountain pens.
[0048] In practice, the primer coating device can spray primer onto the writing pens on the uncoated writing pen conveyor belt. After passing through the primer coating device, the writing pens on the uncoated writing pen conveyor belt directly enter the primer-coated writing pen conveyor belt.
[0049] Step 202: Control the primer coating device to perform a primer spraying operation on the writing pens on the uncoated writing pen conveyor belt.
[0050] In some embodiments, the aforementioned execution entity can control the aforementioned baking device to perform coating drying treatment on the writing pens on the aforementioned primer-coated writing pen conveyor belt. In practice, the writing pens pass directly through the aforementioned baking device via the aforementioned primer-coated writing pen conveyor belt, thereby completing the primer treatment.
[0051] Step 203: Control the molten plastic coating device to perform molten plastic coating treatment on the writing pen after the coating drying process, and move the writing pen after the molten plastic coating treatment onto the molten plastic coating writing pen conveyor belt.
[0052] In some embodiments, the executing entity can control the molten plastic coating device to perform molten plastic coating on the writing pen after the coating drying process, and to move the writing pen after the molten plastic coating process onto the molten plastic coated writing pen conveyor belt. In practice, the molten plastic coating device can be a spray gun. The molten plastic coating device 6 can spray molten plastic onto the writing pen on the primer-coated writing pen conveyor belt. After passing through the molten plastic coating device, the writing pen on the primer-coated writing pen conveyor belt directly enters the molten plastic coated writing pen conveyor belt.
[0053] Step 204: Control the cooling device to perform coating cooling treatment on the writing pen on the conveyor belt of the molten plastic coating writing pen.
[0054] In some embodiments, the aforementioned execution entity may control the aforementioned cooling device to perform coating cooling treatment on the writing pen on the aforementioned molten plastic coating writing pen conveyor belt. In practice, the writing pen is cooled by passing through the aforementioned cooling device on the aforementioned molten plastic coating writing pen conveyor belt.
[0055] Step 205: Control the coated writing pen conveyor belt to transport the cooled writing pen.
[0056] In some embodiments, the aforementioned execution entity may control the coated writing pen conveyor belt to transport the cooled writing pen.
[0057] Optionally, the aforementioned plastic-coated writing pen manufacturing equipment further includes a defective product rejection device. This defective product rejection device is communicatively connected to the aforementioned controller. The defective product rejection device may include a first laser rangefinder sensor, a second laser rangefinder sensor, a laser signal processor, and a robotic arm. The first and second laser rangefinder sensors are respectively installed on both sides of the coated writing pen conveyor belt. The first and second laser rangefinder sensors face each other. The distance between the first and second laser rangefinder sensors is a fixed value. The robotic arm is positioned on either side of the coated writing pen conveyor belt. In practice, this fixed value is slightly larger than the width of the coated writing pen conveyor belt.
[0058] Optionally, the aforementioned implementing entity may also perform the following steps:
[0059] The first step involves, in response to determining that the writing pen on the coated writing pen conveyor belt has passed the first laser distance sensor and the second laser distance sensor, performing laser measurement processing on the writing pen on the coated writing pen conveyor belt using the first laser distance sensor and the second laser distance sensor to obtain measurement data.
[0060] As an example, the above measurement data includes the time difference between signal transmission and reception of the first laser rangefinder sensor and the time difference between signal transmission and reception of the second laser rangefinder sensor.
[0061] The second step involves processing the measurement data using the laser signal processor to obtain the pen length recognition result.
[0062] As an example, the time difference between the transmission and reception of the first laser rangefinder signal and the second laser rangefinder signal can be calculated separately, and the quotient of the time difference between the transmission and reception of the second laser rangefinder signal and 2 can be obtained to obtain the first quotient value and the second quotient value. The product of the first quotient value and the second quotient value with the speed of light is determined as the first distance value and the second distance value, respectively. Subtracting the first distance value and the second distance value from the above fixed values yields the pen length value. The pen length value can be used as the pen length recognition result.
[0063] Third, in response to determining that the pen length recognition result meets the rejection condition, the pen length recognition result is sent to the controller. The rejection condition may be that the pen length value in the pen length recognition result is less than the target pen length value.
[0064] The fourth step is to control the robotic arm to perform a grasping operation corresponding to the received pen length recognition result.
[0065] The above-described step of measuring the length of a writing pen, as an inventive aspect of this disclosure, solves the second technical problem mentioned in the background art: "Currently, in the production of writing pens, defective writing pens are often removed from the production line by manual visual inspection. This method is labor-intensive, time-consuming, and prone to omissions." The factors leading to this technical problem are often as follows: Currently, in the production of writing pens, defective writing pens are often removed from the production line by manual visual inspection. Solving these factors can improve the efficiency of removing defective writing pens. To achieve this effect, this disclosure introduces a first laser distance sensor and a second laser distance sensor positioned opposite each other on both sides of a conveyor belt. Utilizing the principle of laser ranging, the distance between the writing pen and the first and second laser distance sensors is measured as the writing pen passes between them. Then, the length of the writing pen is determined based on a fixed distance value between the first and second laser distance sensors. Thus, writing pens whose length does not meet the requirements after coating processing can be removed. Compared to manual removal, this method greatly improves efficiency.
[0066] Optionally, the aforementioned plastic-coated writing pen preparation equipment further includes a label spraying device. The label spraying device may include a writing pen holder and a label sprayer. The aforementioned executing entity may also perform the following steps:
[0067] The first step is to control the writing pen holder to grab and fix the writing pen on the coated writing pen conveyor belt.
[0068] The second step is to control the aforementioned marking spraying device to perform marking spraying operations on the fixed writing pen.
[0069] The third step is to control the pen holder to perform the fixation release operation after the marking spraying operation.
[0070] Optionally, the aforementioned defective product rejection device also includes a camera and a rolling device. The camera can be mounted directly above the coated writing pen conveyor belt. The rolling device can be mounted on the coated writing pen conveyor belt directly below the camera. The rolling device can rotate the writing pens on the coated writing pen conveyor belt at 150-degree angles each time. This ensures that the images captured by the camera of the writing pens overlap, facilitating subsequent image matching and stitching.
[0071] Optionally, the aforementioned implementing entity may also perform the following steps:
[0072] The first step is to control the aforementioned rolling device to rotate the writing pen three times in sequence.
[0073] The second step is to control the camera to take pictures of the writing pen after each rotation, thus obtaining a group of images of the writing pen.
[0074] The third step is to crop the writing pen area in each of the above writing pen image groups to obtain a cropped area image group.
[0075] The fourth step involves performing planar projection processing on each cropped region image in the aforementioned cropped region image group to obtain a group of projected images of the writing pen. Perspective transformation or affine transformation can be used to perform the planar projection processing on each cropped region image in the aforementioned cropped region image group.
[0076] The fifth step is to perform pairwise matching of the writing pen projection images in the above group of writing pen projection images to obtain matching information.
[0077] Step 6: Based on the matching information above, stitch together the writing pen projection images in the above writing pen projection image group to obtain a stitched writing pen image.
[0078] Step 7: Based on the above-mentioned spliced image of the writing pen, determine whether the markings on the writing pen are crooked or missing, and whether the coating of the writing pen is missing.
[0079] Step 8: In response to determining that the markings on the writing pen are not crooked or missing and that the coating on the writing pen is not missing, the writing pen is determined to have passed the visual inspection.
[0080] Step 9: In response to determining that the markings on the writing pen are crooked or missing, or that the coating on the writing pen is missing, determine that the writing pen passes the visual inspection.
[0081] Optionally, the execution entity may further include the following steps in performing pairwise matching of the writing pen projection images in the aforementioned writing pen projection image group to obtain matching information:
[0082] The first step involves selecting two writing pen projection images from the aforementioned group of writing pen projection images that have not been matched with each other, respectively serving as the target writing pen projection image and the reference writing pen projection image. Then, the following matching sub-step is performed using the target writing pen projection image and the reference writing pen projection image:
[0083] The first matching sub-step involves selecting a grid region from the edge of the target writing pen projection image as the target grid region. The target grid region can be square in shape.
[0084] The second matching sub-step involves sequentially selecting grid regions as reference grid regions from the aforementioned projection image of the writing pen, thus obtaining a set of reference grid regions. There are no gaps or overlaps between the reference grid regions in this set.
[0085] The third matching sub-step involves determining the average value of each color value within each reference grid region in the target grid region and the set of reference grid regions.
[0086] The fourth matching sub-step involves selecting the reference grid region from the aforementioned set of reference grid regions that has the smallest sum of squares of the average value of each color value and the average value of the target grid region, and using this as the initial matching reference grid.
[0087] The fifth matching sub-step involves determining the sum of the squares of the average color values of the aforementioned preliminary matching reference grid region and the average color values of the aforementioned target grid region as the reference average value.
[0088] In the sixth matching sub-step, in response to determining that the above reference average value is less than or equal to a preset threshold, the center point coordinates of the above preliminary matching reference grid area and the above target grid area are added to the above matching information as matching coordinate pairs.
[0089] The above steps, as an inventive point of this disclosure, solve the second technical problem mentioned in the background art: "Currently, in the production of writing pens, defective writing pens are often removed from the production line by manual visual inspection. This method is labor-intensive, time-consuming, and prone to omissions." The factors leading to the above technical problem are often as follows: Currently, in the production of writing pens, defective writing pens are often removed from the production line by manual visual inspection. Solving these factors can improve the efficiency of removing defective writing pens. To achieve this effect, this disclosure introduces a camera and a rolling device. The rolling device rotates the writing pens on the conveyor belt, while the camera takes pictures of the writing pens after each rotation, obtaining a group of writing pen images. Then, the writing pen images in the writing pen image group are cropped, projected, matched, and stitched together to obtain a planar unfolded view of the writing pen surface. Therefore, by detecting the spliced image of the writing pen, it is possible to accurately determine whether the markings on the writing pen are crooked or missing, and whether the coating of the writing pen is missing, thereby eliminating defective writing pens.
[0090] The various embodiments of this disclosure have the following beneficial effects: Plastic-coated writing pens prepared using the plastic-coated writing pen preparation equipment of some embodiments of this disclosure can improve user comfort and safety during use. Specifically, the reasons why related writing pens result in poor user comfort and low safety during use are: wooden writing pens are hard, and long-term use can easily cause calluses on the user's hands. Furthermore, the paint coating on the outer layer of the writing pen is often easily peeled off, which may harm the health of children if accidentally ingested. Based on this, the plastic-coated writing pen preparation of some embodiments of this disclosure includes a writing pen transport device, a coating device, a baking device, a cooling device, and a controller. The writing pen transport device includes an uncoated writing pen conveyor belt, a primer-coated writing pen conveyor belt, a molten plastic-coated writing pen conveyor belt, and a coated writing pen conveyor belt. The uncoated writing pen conveyor belt and the primer-coated writing pen conveyor belt are aligned and connected, as are the molten plastic-coated writing pen conveyor belt and the coated writing pen conveyor belt. The coating apparatus includes a primer coating apparatus and a molten plastic coating apparatus. The primer coating apparatus is positioned above the uncoated writing pen transport apparatus, and the molten plastic coating apparatus is located between the baking apparatus and the cooling apparatus. The baking apparatus is configured to dry the writing pen coated with the primer, and the primer-coated writing pen transport belt passes through the baking apparatus. The cooling apparatus is configured to cool the writing pen coated with the molten plastic, and the molten plastic coated writing pen transport belt passes through the cooling apparatus. The writing pen transport apparatus, the coating apparatus, the baking apparatus, the cooling apparatus, and the controller are communicatively connected. The controller is configured to perform the following steps: controlling the primer coating apparatus to perform a primer spraying operation on the writing pens on the uncoated writing pen transport belt; and controlling the baking apparatus to perform a coating drying treatment on the writing pens on the primer-coated writing pen transport belt. Therefore, by spraying a primer layer onto the unprocessed writing pen, the surface of the writing pen can be more easily coated with molten plastic. The aforementioned molten plastic coating device is controlled to perform molten plastic coating treatment on the writing pen after the coating drying process, and to move the writing pen after the molten plastic coating treatment onto the molten plastic coated writing pen conveyor belt. The aforementioned cooling device is controlled to perform coating cooling treatment on the writing pen on the molten plastic coated writing pen conveyor belt. Thus, the molten plastic coating on the surface of the writing pen is cooled and solidified through the cooling treatment. The aforementioned coated writing pen conveyor belt is controlled to transport the cooled writing pen. Therefore, by adding a layer of plastic to the surface of the untreated writing pen and then injection molding it, a complete outer coating of the writing pen can be achieved.Because of the inherent softness of plastic, this not only improves the feel when holding it, but also enhances user comfort and safety due to its environmentally friendly and non-toxic properties.
[0091] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.
Claims
1. A device for preparing a plastic-coated writing pen, comprising a writing pen transport device, a coating device, a baking device, a cooling device, and a controller, wherein, The writing pen transport device includes an uncoated writing pen conveyor belt, a primer-coated writing pen conveyor belt, a molten plastic-coated writing pen conveyor belt, and a coated writing pen conveyor belt. The uncoated writing pen conveyor belt and the primer-coated writing pen conveyor belt are aligned and connected, and the molten plastic-coated writing pen conveyor belt and the coated writing pen conveyor belt are aligned and connected. The coating apparatus includes a primer coating apparatus and a molten plastic coating apparatus. The primer coating apparatus is positioned above the uncoated writing pen conveyor belt, and the molten plastic coating apparatus is located between the baking apparatus and the cooling apparatus. The baking device is configured to dry writing pens coated with a primer layer, and the primer-coated writing pen conveyor belt passes through the baking device. The cooling device is configured to cool a writing pen coated with a molten plastic coating, and the conveyor belt of the molten plastic coated writing pen passes through the cooling device. The writing pen transmission device, the coating device, the baking device, the cooling device, and the controller are communicatively connected, and the controller is configured to perform the following steps: The primer coating device is controlled to perform a primer spraying operation on the writing pens on the uncoated writing pen conveyor belt; The baking device is controlled to perform coating drying treatment on the writing pens on the primer coating conveyor belt; The system controls the molten plastic coating device to perform molten plastic coating on writing pens that have undergone coating and drying treatment, and to move the writing pens after molten plastic coating treatment onto the molten plastic coated writing pen conveyor belt. The plastic coated writing pen preparation equipment further includes a molten plastic transport device, which includes a molten plastic transport pipe and pipe insulation material. The molten plastic coating device includes a spraying track and a spray gun. The spraying track is aligned and connected to both the primer-coated writing pen conveyor belt and the molten plastic coating conveyor belt. The spray gun is suspended above the molten plastic transport device and threadedly connected to the molten plastic transport pipe. The system controls the spray gun to perform molten plastic spraying operations on the writing pens on the spraying track. The cooling device is controlled to perform coating cooling treatment on the writing pens on the conveyor belt of the molten plastic coating writing pens; Control the coated writing pen conveyor belt to transport the cooled writing pen; The plastic-coated writing pen preparation equipment also includes a marking spraying device, which includes a writing pen holder and a marking sprayer; The following steps are performed: First, the pen holder is controlled to grab and fix the pen on the coated pen conveyor belt; second, the marking spraying device is controlled to perform marking spraying operation on the fixed pen; third, the pen holder is controlled to perform a fixing release operation after the marking spraying operation. The plastic-coated writing pen manufacturing equipment also includes a defective product rejection device, which includes a camera and a rolling device. The camera is installed directly above the coated writing pen conveyor belt, and the rolling device is installed on the coated writing pen conveyor belt directly below the camera. The rolling device rotates the writing pens on the coated writing pen conveyor belt at an angle of 150 degrees each time to ensure that there is an overlap between the images of the writing pens captured by the camera, which facilitates subsequent image matching and stitching. The following steps are performed: First, the rolling device is controlled to rotate the writing pen three times sequentially. Second, the camera is controlled to take pictures of the writing pen after each rotation, resulting in a group of writing pen image images. Third, the writing pen area in each image of the writing pen in the group of writing pen image images is cropped, resulting in a group of cropped area image images. Fourth, each cropped area image in the group of cropped area image images is subjected to planar projection processing, resulting in a group of writing pen projection image images. Perspective transformation or affine transformation is used for the planar projection processing of each cropped area image in the group of cropped area image images. Fifth, the writing pen projection image in the group of writing pen projection image images... Step 6: Perform pairwise matching to obtain matching information. Based on the matching information, stitch the writing pen projection images in the writing pen projection image group to obtain a stitched writing pen image. Step 7: Determine whether the markings on the writing pen are skewed or missing, and whether the coating on the writing pen is missing, based on the stitched writing pen image. Step 8: In response to determining that the markings on the writing pen are not skewed or missing, and that the coating on the writing pen is not missing, determine that the writing pen passes the appearance inspection. Step 9: In response to determining that the markings on the writing pen are skewed or missing, or that the coating on the writing pen is missing, determine that the writing pen passes the appearance inspection. The process of matching the pen projection images in the pen projection image group to obtain matching information includes the following steps: First, select two pen projection images from the pen projection image group that have not been matched before, respectively serving as the target pen projection image and the reference pen projection image. Then, perform the following matching sub-steps using the target pen projection image and the reference pen projection image: First matching sub-step: Select a grid region from the edge of the target pen projection image as the target grid region, wherein the target grid region is square. Second matching sub-step: Sequentially select grid regions from the reference pen projection image as reference grid regions to obtain a set of reference grid regions. There are no gaps or overlaps between the reference grid regions in the region set. The third matching sub-step determines the average value of each color value within the target grid region and each reference grid region in the reference grid region set. The fourth matching sub-step selects the reference grid region from the reference grid region set whose sum of the squares of the average color values of each color value and the average color values of the target grid region is the smallest, as the initial matching reference grid. The fifth matching sub-step determines the sum of the squares of the average color values of the initial matching reference grid region and the average color values of the target grid region as the reference average value. The sixth matching sub-step, in response to determining that the reference average value is less than or equal to a preset threshold, adds the center point coordinates of the initial matching reference grid region and the target grid region as matching coordinate pairs to the matching information.
2. The apparatus for preparing a plastic-coated writing pen according to claim 1, wherein, The equipment for preparing plastic-coated writing pens also includes a heating device, which includes a heating container with a solid plastic inlet, a pigment inlet, and a molten plastic outlet. The pipe insulation material is wrapped around the outside of the molten plastic transmission pipe, and the molten plastic transmission pipe is threadedly connected to the molten plastic outlet.
3. The apparatus for preparing a plastic-coated writing pen according to claim 2, wherein, The controller is further configured to perform the following steps: The heating device controls the heating container in the heating device to heat and stir the solid plastic and color paste conveyed by the solid plastic inlet and the color paste inlet, and to output the stirred molten plastic through the molten plastic outlet.
4. The apparatus for preparing a plastic-coated writing pen according to claim 3, wherein, The molten plastic coating device includes a dipping container, a lifting perforated plate, and a gripping device. The lifting perforated plate is connected to the bottom of the dipping container via an electric push rod. The lifting perforated plate can move up and down inside the dipping container. The dipping container is threadedly connected to the molten plastic conveying device. The dipping container is used to hold the molten plastic conveyed by the molten plastic conveying device. The controller controls the molten plastic coating device to perform molten plastic coating on the writing pen after the coating drying process by executing the following steps: and moves the writing pen after the molten plastic coating process onto the molten plastic coated writing pen conveyor belt. The gripping device is controlled to move the writing pen, after the coating drying treatment, from the primer-coated writing pen conveyor belt into the dip-coating container; The lifting and hollowing plate inside the dip coating container is controlled to lift the writing pen inside the dip coating container upwards and lift it away from the molten plastic inside the dip coating container; The gripping device is controlled to move the writing pen on the lifting hollow plate to the conveyor belt of the writing pen with molten plastic coating.
5. The apparatus for preparing a plastic-coated writing pen according to claim 3, wherein, The molten plastic coating device includes a push-pull device and a drawing device. The drawing device includes a coating tank, a drawing hole inlet, and a drawing hole outlet. The drawing hole inlet and the drawing hole outlet are located at opposite ends of the coating tank. The drawing hole outlet is equipped with a rubber ring, which is sleeved and connected to the drawing hole outlet. The coating tank has a feed opening at the top. The molten plastic transfer device is threadedly connected to the feed opening at the top of the coating tank. The coating tank is used to hold molten plastic. The length of the drawing device is less than the length of a writing pen. The controller controls the molten plastic coating device to perform molten plastic coating on the writing pen after the coating drying process by executing the following steps: and moves the writing pen after the molten plastic coating process onto the molten plastic coated writing pen conveyor belt. The push-pull device is controlled to push the writing pen, which has been dried after coating treatment, from the inlet of the extraction hole into the coating tank on the conveyor belt for writing pens coated with primer. The push-pull device is controlled to pull the writing pen from the outlet of the coating hole and to move the writing pen onto the conveyor belt for the molten plastic coating.
6. The apparatus for preparing a plastic-coated writing pen according to claim 5, wherein, The defective product rejection device is communicatively connected to the controller. The defective product rejection device also includes a first laser range sensor, a second laser range sensor, a laser signal processor, and a robotic arm. The first laser range sensor and the second laser range sensor are respectively installed on both sides of the coated writing pen conveyor belt, facing each other. The distance between the first laser range sensor and the second laser range sensor is a fixed value. The robotic arm is positioned on either side of the coated writing pen conveyor belt. The defective product rejection device is configured to perform the following steps: In response to determining that the writing pen on the coated writing pen conveyor belt has passed the first laser distance sensor and the second laser distance sensor, the writing pen on the coated writing pen conveyor belt is subjected to laser measurement processing by the first laser distance sensor and the second laser distance sensor to obtain measurement data; The laser signal processor processes the measurement data to obtain a pen length recognition result; in response to determining that the pen length recognition result meets the rejection condition, the pen length recognition result is sent to the controller; Based on the received pen length recognition result, the robotic arm is controlled to perform a grasping operation corresponding to the pen length recognition result.
7. A method for preparing a plastic-coated writing pen, applied to the plastic-coated writing pen preparation equipment as described in any one of claims 1-6, wherein, The plastic-coated writing pen manufacturing equipment includes a writing pen conveyor, a coating device, a baking device, a cooling device, and a controller. The writing pen conveyor includes an uncoated writing pen conveyor belt, a primer-coated writing pen conveyor belt, a molten plastic-coated writing pen conveyor belt, and a coated writing pen conveyor belt. The coating device includes a primer coating device and a molten plastic coating device. The method includes: The primer coating device is controlled to perform a primer spraying operation on the writing pens on the uncoated writing pen conveyor belt; The baking device is controlled to perform coating drying treatment on the writing pens on the primer coating conveyor belt; The device controls the molten plastic coating process to apply molten plastic coating to the writing pen after the coating drying process, and moves the writing pen after the molten plastic coating process onto the molten plastic coated writing pen conveyor belt. The cooling device is controlled to perform coating cooling treatment on the writing pens on the conveyor belt of the molten plastic coating writing pens; The coated writing pen conveyor belt is controlled to transport the cooled writing pen.