Motor vehicle license plate pressing method and device

Abstract

The invention provides a motor vehicle license plate pressing method and device, and relates to the technical field of motor vehicle license plate processing. The motor vehicle license plate pressing method sequentially comprises the steps of feeding, weighing, transferring, matrix assembling, punch forming, matrix separating, erasing treatment and discharging. After being weighed and screened, the license plate base material is transferred to the stamping and positioning station through the mechanical arm device, the selected character die is pushed into the stamping die frame to be positioned, protruding characters are formed through stamping, and then the character die retreats. In the erasing process, the non-woven fabric and the character area are attached and reversely run, the spraying pipe sprays erasing liquid from bottom to top, surface layer ink is directionally removed, and the bottom color is shown. The erasing liquid is partially absorbed by the non-woven fabric, and the residual liquid is recycled. And the fixing and sealing screw assemblies matched with the license plates are output through the automatic fixing and sealing discharging device and conveyed to a collecting station together with the license plates. According to the method, all procedures are connected closely in sequence, and character forming definition and matching delivery efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of motor vehicle license plate processing, and in particular to a method and device for pressing motor vehicle license plates. Background Art

[0002] Motor vehicle license plates are essential identifiers for vehicle identification. Over time, their production process has evolved into a comprehensive system encompassing multiple steps, including character stamping, pattern display, and finished product output. To meet the demands of high-volume, standardized production, the license plate manufacturing industry is evolving towards mechanization and automation, with equipment replacing manual labor in some manufacturing processes. However, many production lines in the current market still employ a segmented operation structure.

[0003] Taking the license plate character pressing process as an example, existing production lines usually distribute processes such as feeding, quality inspection, character stamping and character display in different device modules. The operating logic is mainly based on series control. In actual operation, each link mainly relies on manual judgment for connection, which not only increases the frequency of human intervention, but also makes it difficult to maintain a stable and unified processing rhythm.

[0004] Since the above-mentioned process is loosely organized, information is disconnected between processes, the structural transmission paths are diverse and uncontrollable, and the overall coordination is still significantly insufficient, the entire production line is prone to problems such as rhythm disorder and poor wiping effect in actual operation, affecting the consistency and yield of the product. Especially in application scenarios with high requirements for the clarity of license plate characters and the consistency of wiping effect, such detail defects caused by poor process connection will directly affect the recognition accuracy. Therefore, current technology urgently needs a license plate pressing method that can optimize the processing flow and improve the coordination of processes, so as to achieve overall control from loading to forming to color development, thereby improving character consistency and product stability. Summary of the Invention

[0005] The present application provides a method and device for pressing a motor vehicle license plate, which is used to solve the problem in the prior art that each step of the license plate pressing process is relatively independent and has a low degree of coordination.

[0006] In a first aspect, the present application provides a method for pressing a motor vehicle license plate, comprising the following steps: Step 1: Loading: The license plate substrate is fed into the loading channel in sequence through the loading device, and then transported along the loading channel to the location of the weighing device; Step 2: Weighing: The quality of the license plate substrate is tested using a weighing device installed on the feeding channel. The license plate substrates that exceed the set quality range are rejected. Step 3, Transfer: The robot device will grab the qualified license plate substrates in sequence, and transport them to the stamping area along the preset path, and place them on the corresponding positioning station of the stamping die frame to complete the alignment; Step 4: Font assembly: retrieve the target character font from the font library module, push the font along the preset path into the stamping die frame through the font pushing device and complete the positioning; Step 5: Stamping: The stamping die frame is controlled to descend by a stamping device equipped with a lifting drive mechanism, so that the character mold is pressed onto the surface of the license plate substrate to form raised characters; Step 6: Separation of the mold: After the stamping is completed, the mold is removed from the mold frame through the license plate mold separation device to separate it from the license plate substrate; Step 7: Erasing: The stamped license plate substrate is fed into the erasing device, where a non-woven fabric moving in the opposite direction of the substrate is adhered to the surface of the character area. At the same time, an erasing liquid is sprayed onto the non-woven fabric from bottom to top through a spray pipe provided below the non-woven fabric, so that the ink on the surface of the character area is erased in a targeted manner, revealing the base color and enhancing recognizability. Step 8: Discharging: After the lettering is erased, the pre-packaged sealing screw assembly for installing the license plate is discharged through the automatic sealing device, and the erased license plate substrate and the pre-packaged sealing screw assembly are transported to the collection station to complete the process; During the erasing process, the non-woven fabric is in a tensioned state and moves continuously. After the erasing liquid is sprayed, it is partially absorbed by the non-woven fabric, and the remaining liquid flows back to the liquid supply system for recycling.

[0007] Optionally, in step 1, the license plate substrate is continuously transported along the loading path to the location of the weighing device under the drive of the loading device. During the weighing detection process, the license plate substrate remains in a continuous motion state. The weighing device completes the quality detection and outputs a detection signal for determining whether it is qualified.

[0008] Optionally, in step 3, the robot device starts the grabbing action after receiving the qualified signal from the weighing device, and the grabbed license plate substrate is transferred to the stamping area along the transverse track and falls on the positioning station below the stamping die frame.

[0009] Optionally, in step 4, the font pushing device starts working after the robot device completes the license plate substrate placement action, pushes the selected font along the preset guide path into the stamping die frame, and makes the font stay at the set positioning position of the stamping die frame.

[0010] Optionally, in step 5, the stamping process includes the following actions: after the stamping device is started, the stamping die frame descends at a uniform speed to the contact position with the license plate substrate, continues to press for a specified time under the set pressure maintenance state, and then controls the die stamping frame to lift back to its original position.

[0011] Optionally, in step 6, the type mold separation action is started after the stamping device completes the lifting of the stamping mold frame, and the type mold exits its original position under the drive of the mold frame release mechanism. The exit path is opposite to the type mold pushing path in direction, and guides the type mold to the recovery area.

[0012] Optionally, in step 7, the erasing device includes a non-woven fabric component and a spray component arranged along the erasing path, and the non-woven fabric component can make the non-woven fabric run continuously under the drive of the driving mechanism, and fit with the surface of the character area of the license plate substrate and maintain a tensioned state during the operation; the spray component is arranged below the non-woven fabric component, and the spray component includes a spray pipe arranged perpendicular to the conveying direction of the license plate substrate, and the spray pipe is supplied with erasing liquid by the liquid supply system, and a plurality of upward atomizing nozzles are provided on the spray pipe for evenly spraying the erasing liquid onto the lower surface of the non-woven fabric.

[0013] Optionally, in step 7, the non-woven fabric component drives the non-woven fabric for erasing to move in a direction opposite to the conveying direction of the license plate substrate. The non-woven fabric and the license plate substrate maintain consistent linear speeds during the bonding process, forming a relative sliding erasing action. A liquid collection tank is provided under the spray pipe to collect the erasing liquid not absorbed by the non-woven fabric and guide it back to the liquid supply system.

[0014] Optionally, in step 8, during the discharging process, the automatic sealing device starts working after the lettering is erased, automatically outputs the pre-packaged sealing screw assembly for installing the license plate, and transports the screw assembly together with the license plate substrate after the lettering is erased to the collection station.

[0015] On the other hand, the present application further provides a motor vehicle license plate pressing device, which is applied to the motor vehicle license plate pressing method provided in the present application. The motor vehicle license plate pressing device includes a loading module, a stamping module, an erasing device, and a discharging module connected in sequence, wherein: The loading module includes a loading device, a weighing device and a manipulator device. The loading device is used to sequentially convey the license plate substrate to the weighing device. The weighing device is used to perform quality inspection on the license plate substrate. The manipulator device is used to grab the license plate substrate that has passed the weighing and transfer it to the positioning station of the stamping module. The stamping module includes a character library, a license plate character mold pushing device, a stamping device and a license plate character mold separation device, the character library is used to store character character molds, the license plate character mold pushing device is used to push the selected character mold along the path into the stamping die frame of the stamping device, the stamping device is provided with a stamping die frame with a lifting function, which is used to press the character mold onto the surface of the license plate substrate to form raised characters, and the license plate character mold separation device is used to withdraw the character mold from the stamping die frame after stamping; The erasing device includes a non-woven fabric component arranged on the erasing path and a spray pipe component located below the non-woven fabric component. The non-woven fabric component is arranged to be in contact with the surface of the license plate substrate and to move in a direction opposite to the direction in which the license plate is conveyed. The spray pipe assembly is used to spray the erasing liquid upward onto the lower surface of the non-woven fabric to directionally erase the outermost layer of ink in the raised character area during the conveyance of the license plate. The discharging module includes an automatic sealing device for discharging pre-packaged sealing screw assemblies and conveying them to a collection area together with the erased license plate substrate. The loading module, the punching module, the erasing device and the discharging module are arranged in sequence along the license plate processing path and are connected by a transmission structure to form a continuous processing flow channel.

[0016] Compared with the prior art, this application has the following beneficial effects: 1. This application has established a complete and coherent processing path by arranging multiple key operating steps such as loading, weighing, transporting, stamping, mold separation, erasing and discharging in a set process sequence, effectively avoiding the problems of scattered processes and poor connection in the existing technology. Especially in the pre-processing stage, the license plate substrate enters the detection position equipped with a weighing device in sequence through the feeding device, and unqualified license plate substrates are removed in advance through quality screening to avoid them from flowing into the subsequent processing flow, reducing resource waste and enhancing the controllability of finished product quality. Through this structural pre-screening mechanism, not only the material utilization efficiency of the entire process chain is improved, but also a stable quality processing foundation is provided for the subsequent character pressing link.

[0017] 2. During the character pressing process, the qualified substrate that has been weighed is mechanically transferred to a preset positioning station so that it can be accurately spatially aligned with the character font to be assembled later. The font is then fed into the stamping die frame and positioned. After the stamping device is started, the stamping die frame is controlled to descend so that the font is pressed into the surface of the substrate to form raised characters, completing the character forming. After the pressing is completed, the font is separated and exits the stamping die frame, which reduces the mold retention time and the risk of mold jamming or deformation. This process improves the clarity of character boundaries and the stability of embossing through structural coordination and sequential execution, helps the characters maintain a regular shape, and provides structural conditions for the next step of erasing.

[0018] 3. In the post-processing stage, the license plate substrate after the characters are pressed is introduced into the erasing device, which realizes the continuous connection of the processing rhythm. The erasing process is carried out immediately after the character forming step, which helps to reduce the displacement amplitude of the substrate during the transmission process and reduce the risk of character position deviation or structural deformation. After the erasing is completed, the license plate substrate continues to be transported backward and cooperates with the automatic sealing device in the discharging area. The device provides the sealing screw assembly for subsequent installation and outputs it uniformly, forming a continuous processing flow with character forming, character erasing and sealing parts output as a closed loop. Throughout the process, each step is executed in sequence according to the set order, and the process is closely connected, which is convenient for controlling the rhythm consistency of character processing. Through the reasonable arrangement of the processing links and the compact design of the action time, the problems of character color deviation, edge blur and plate warping caused by rhythm disconnection or transportation intervention in the traditional production process are better alleviated, and the process performance of the license plate finished product in character recognition performance and appearance stability is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 A schematic flow chart of a method for pressing a motor vehicle license plate according to an embodiment of the present application; Figure 2 This is one of the overall schematic diagrams of the motor vehicle license plate pressing device provided in one embodiment of the present application; Figure 3 This is the second overall schematic diagram of the motor vehicle license plate pressing device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application are clearly and completely described below. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts also fall within the scope of protection of this application.

[0022] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0024] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0025] See also Figure 1-Figure 3 , Figure 1 A schematic flow chart of a method for pressing a motor vehicle license plate according to an embodiment of the present application; Figure 2 This is one of the overall schematic diagrams of the motor vehicle license plate pressing device provided in one embodiment of the present application; Figure 3 This is the second overall schematic diagram of the motor vehicle license plate pressing device provided in one embodiment of the present application.

[0026] The embodiment of the present application provides a method for pressing a motor vehicle license plate, which includes eight steps in sequence: loading, weighing, transporting, die assembly, stamping, die separation, letter erasure and discharge. Figure 1 As shown, the motor vehicle license plate pressing method provided in the embodiment of the present application has the following specific steps: Step S101: The license plate substrate is sequentially fed into a feeding channel through a feeding device, and is transported along the feeding channel to the location of a weighing device.

[0027] Step S102: Using a weighing device provided on the feeding channel, the quality of the license plate substrate is inspected, and the license plate substrates exceeding the set quality range are discarded.

[0028] Step S103: The robot device sequentially grabs the qualified license plate substrates and transports them to the stamping area along a preset path, and places them on the positioning station corresponding to the stamping die frame to complete the alignment.

[0029] Step S104: retrieve the target character font from the font library module, and push the font into the stamping die frame along a preset path through the font pushing device to complete the positioning.

[0030] Step S105: controlling the stamping die frame to descend by a stamping device provided with a lifting drive mechanism, so that the character mold is pressed onto the surface of the license plate substrate to form raised characters.

[0031] Step S106: After the stamping is completed, the license plate mold is removed from the mold frame by the license plate mold separation device to achieve separation from the license plate base material.

[0032] Step S107: The punched license plate substrate is fed into the erasing device, and a non-woven fabric moving in the opposite direction to the substrate conveying direction is used to adhere to the surface of the character area. At the same time, an erasing liquid is sprayed onto the non-woven fabric from bottom to top through a spray pipe arranged below it, so that the ink on the surface of the character area is directionally erased, revealing the background color and enhancing recognizability.

[0033] Step S108: After the lettering is erased, the pre-packaged sealing screw assembly for installing the license plate is outputted through the automatic sealing device, and the erased license plate substrate and the pre-packaged sealing screw assembly are transported to the collection station to complete the process flow; During the erasing process, the non-woven fabric is in a tensioned state and moves continuously. After the erasing liquid is sprayed, it is partially absorbed by the non-woven fabric, and the remaining liquid flows back to the liquid supply system for recycling.

[0034] The embodiment of the present application establishes a complete and coherent processing path by arranging multiple key operating steps such as loading, weighing, transporting, stamping, mold separation, erasing and discharging in a set process sequence, which effectively avoids the problems of scattered processes and poor connection in the prior art. Especially in the pre-processing stage, the license plate substrate enters the detection position equipped with a weighing device in sequence through the loading device, and unqualified license plate substrates are removed in advance through quality screening to avoid them from flowing into the subsequent processing flow, reducing resource waste and enhancing the controllability of finished product quality. Through this structural pre-screening mechanism, not only the material utilization efficiency of the entire process chain is improved, but also a stable quality processing foundation is provided for the subsequent character pressing link.

[0035] At the same time, during the character pressing process, the qualified substrate that has been weighed is mechanically transferred to a preset positioning station so that it can be accurately spatially aligned with the character font to be assembled later. The font is then fed into the stamping die frame and positioned. After the stamping device is started, the stamping die frame is controlled to descend, so that the font is pressed into the surface of the substrate to form raised characters, completing the character forming. After the pressing is completed, the font is separated and exits the stamping die frame, reducing the mold retention time and the risk of mold jamming or deformation. This process improves the clarity of character boundaries and the stability of embossing through structural coordination and sequential execution, helps the characters maintain a regular shape, and provides structural conditions for the next step of erasing.

[0036] In addition, in the post-processing stage, the license plate substrate after the characters are pressed is introduced into the erasing device, which realizes the continuous connection of the processing rhythm. The erasing process is carried out immediately after the character forming step, which helps to reduce the displacement amplitude of the substrate during the transmission process and reduce the risk of character position deviation or structural deformation. After the erasing is completed, the license plate substrate continues to be transported backward and cooperates with the automatic sealing device in the discharging area. The device provides the sealing screw assembly for subsequent installation and outputs it uniformly, forming a continuous processing flow with character forming, character erasing and sealing parts output as a closed loop. Throughout the process, each step is executed in sequence according to the set order, and the process is closely connected, which is convenient for controlling the rhythm consistency of character processing. Through the reasonable arrangement of the processing links and the compact design of the action time, the problems of character color deviation, edge blur and plate warping caused by rhythm disconnection or transportation intervention in the traditional production process are better alleviated, and the process performance of the license plate finished product in terms of character recognition performance and appearance stability is further improved.

[0037] In this embodiment, an initial processing unit for the front-end conveying and quality screening of license plate substrates is constructed by using a feeding device, a feeding channel, and a weighing device in the pre-processing stage. After the license plate substrate enters the feeding channel in sequence, it continues to move forward to the position of the weighing device without interruption during the process. The weighing device performs a rapid quality inspection on each substrate. Substrates that exceed the set range will be automatically rejected to avoid entering the stamping process, reducing the impact on subsequent processing accuracy. The robotic arm device then grabs the qualified substrate based on the test results and smoothly transports it to the positioning station in the stamping area along a predetermined path. With this complete set of feeding and identification processes, the position accuracy and quality stability of the license plate substrate can be effectively controlled at the front-end stage, thereby reducing the stamping defect rate and improving the consistency of the finished product.

[0038] Continuing to look at the middle structure, this embodiment uses the font library module to store various types of character fonts, and combines the font pushing device to call and accurately transport the target font. The selected font is sent into the stamping die frame under the guidance of the guide path and positioned. Then the lifting drive structure in the stamping device is started, so that the stamping die frame moves down to the position in contact with the license plate substrate, and then the font is pressed on the surface to form a character pattern with a clear appearance and a strong three-dimensional sense. After the pressing action is completed, the font is withdrawn through the font separation device to avoid jamming or deformation problems caused by long-term retention. This series of structural designs and action sequences can improve the repeatability of character positions and the regularity of the forming contour, providing a good basic character form for the wiping link.

[0039] In the erasing process, this embodiment adopts a movement mode in which the non-woven fabric component moves in the opposite direction to the transmission direction of the license plate substrate, forming a continuous sliding contact. The non-woven fabric remains in a tensioned state during operation, forming a stable fit with the surface of the character area, avoiding wrinkles, looseness, and other conditions that affect the uniformity of wiping. At the same time, the spray pipe assembly is arranged below the non-woven fabric assembly and is equipped with multiple upward-facing nozzles to evenly spray the erasing liquid onto the lower surface of the non-woven fabric. After being soaked, the erasing liquid forms an effective contact with the surface of the raised character area. Under the action of the reverse movement of the non-woven fabric, it helps to stably remove the outermost layer of covering ink of the character. In order to avoid waste of resources, a recovery structure is also provided under the spray pipe to collect excess erasing liquid and guide it to the liquid supply system for reuse. Through this set of spraying and contact coordination structures, the problems of local unclear wiping, ink residue or inconsistent color development in traditional erasing methods can be improved, thereby improving the clarity and neatness of the license plate characters.

[0040] In some embodiments, in step S101, the license plate substrate is continuously transported along the loading path to the location of the weighing device under the drive of the loading device. During the weighing detection process, the license plate substrate remains in a continuous motion state. The weighing device completes the quality detection and outputs a detection signal to determine whether it is qualified.

[0041] This embodiment further configures the license plate substrate to move continuously to the weighing position, seamlessly integrating the feeding and testing processes. Compared to traditional methods that require pauses to complete testing, this method eliminates intermediate buffering and pauses, reducing substrate dwell time during transport and making the overall feeding process more efficient. This continuous operation improves the consistency of the processing rhythm and is particularly suitable for automated license plate production lines that require a high degree of consistency in the processing rhythm.

[0042] During the continuous weighing process, the substrate moves forward steadily, completing quality inspections without stopping, and the results are output instantly. This approach avoids positioning errors or conveying rhythm disruptions caused by pauses in inspections, thereby improving operational continuity across the entire line, reducing fluctuations in operating efficiency caused by transitional irregularities, and ensuring smooth transitions between processes.

[0043] Furthermore, the weighing device directly outputs a signal after completing the test, controlling the subsequent robotic arm to initiate the gripping action. The test results are then passed on to downstream processes as execution conditions, helping to ensure a seamless and timely transition between steps like feeding, testing, and gripping. The integrated coordination of continuous substrate delivery, online testing, and result-driven subsequent operations effectively improves operational consistency between front-end feeding and mid-stage processing, providing a stable feeding rhythm and positioning foundation for the subsequent character pressing process, and helping to enhance the overall system's operational coordination and rhythmic balance.

[0044] In some embodiments, in step S103, the robot device starts the grabbing action after receiving the qualified signal from the weighing device, and the grabbed license plate substrate is transferred to the stamping area along the horizontal track and falls on the positioning station below the stamping die frame.

[0045] In some embodiments, in step S103, the robot device starts a grabbing operation after receiving a qualified signal output by the weighing device, transports the license plate substrate along a transverse path to the stamping area, and places it at a positioning station below the stamping die frame.

[0046] In this embodiment, by limiting the robot's activation condition to "grasping only after receiving a qualified signal," a direct linkage between quality inspection and substrate transfer operations is achieved. This method of controlling the transfer step based on the judgment results helps prevent unqualified materials from entering the stamping process and reduces processing anomalies caused by misgrabbing, empty pressure, or mispressing. During operation, the robot can complete the operation judgment based on the inspection results without waiting for additional confirmation, thereby improving the execution consistency of the entire process, reducing waiting delays between each process, and strengthening the rhythm consistency between each link.

[0047] After the gripping operation is completed, the license plate substrate is conveyed along a pre-set transverse path to the stamping area. This transverse conveying method clearly separates the substrate feeding path from the stamping operation area in the direction of travel, helping to simplify path organization and reduce process crossover. In actual operation, the short and clearly defined conveying route reduces shaking and deviation during transfer, helping to maintain the substrate's posture stability throughout the entire movement process, thereby improving its placement accuracy before stamping.

[0048] After being delivered to the stamping area, the license plate substrate is placed directly by a robotic arm at a positioning station beneath the stamping die frame, where it is aligned with the die frame. This complete "grasping-delivery-dropping" process ensures that each substrate is in a relatively stable position before entering the stamping process. Compared to the traditional gravity-dependent drop method, this controlled placement method is more reliable in terms of positioning accuracy and posture control, helping to reduce substrate positional deviation during the drop process and providing a more accurate alignment foundation for the subsequent pressing of the die frame.

[0049] In summary, this embodiment improves the smoothness and position control accuracy of the license plate transfer process through coordinated arrangements in signal response, path layout and placement control, and also enhances the process coordination between each processing step, providing relatively stable pre-processing conditions for subsequent stamping operations.

[0050] In some embodiments, in step S104, the font pushing device starts working after the robotic arm device completes the license plate substrate placement action, pushes the selected font along a preset guide path into the stamping die frame, and makes the font stay at the set positioning position of the stamping die frame.

[0051] In this embodiment, the typeface push operation is scheduled to occur after the license plate substrate is placed, and is initiated immediately after the substrate alignment operation. By setting this execution sequence, the typeface entry operation is always carried out under the condition that the substrate is positioned. This reduces the possibility of unnecessary contact between the typeface and the unaligned substrate during the advancement process, helps reduce the risk of operational anomalies caused by mutual interference, and improves the coordination stability of the previous operations.

[0052] During the push process, the typeface is advanced along a pre-set path to the punching die frame. This path provides directional constraints during the operation, ensuring a relatively consistent trajectory from the initial position to the punching position. Clearly controlling the conveying direction during the process sequence helps minimize lateral deviation or posture changes during the forward movement of the typeface during continuous processing, thereby improving the consistency of the subsequent character formation. This advancement process also facilitates the repeated use of different character types, ensuring excellent operational versatility.

[0053] After the die is pushed into position, it stops and settles into the desired position, preparing for subsequent stamping. Because the substrate is already fixed in place before the die is pushed in, the relative spatial relationship between the two is relatively stable, allowing for basic alignment before stamping begins. This coordinated sequence of operations helps control the contour accuracy of character stamping without relying on additional equipment, reducing embossing deviations caused by die misalignment and misalignment, resulting in more regular appearance, boundaries, and alignment of the formed characters.

[0054] In some embodiments, in step S105, the stamping process includes the following actions: after the stamping device is started, the stamping die frame descends at a uniform speed to a contact position with the license plate substrate, continues pressing for a specified period of time under a set pressure maintenance state, and then controls the die stamping frame to lift back to its original position.

[0055] In this embodiment, the stamping mechanism's motion is divided into three sequential stages: uniform descent, constant pressure maintenance, and automatic return. This segmented control approach, unlike traditional rapid stamping, reduces the impact or hard contact caused by excessive speed as the stamping die frame descends toward the license plate substrate surface, facilitating a smooth transition to initial contact. This uniform motion reduces the transient loads on the die and structural components during the stamping process, extending the lifespan of key components and, to a certain extent, minimizing vibration and structural impact during equipment operation.

[0056] When the stamping die frame comes into contact with the license plate substrate, the stamping die frame will maintain the set pressure range and maintain a certain processing time. Compared with the traditional "press and retreat" method, this constant pressure maintenance action allows the character mold to have more time to complete the molding and pressing after contacting the substrate surface, which is conducive to the full flow and fit of the material in the character area. The molding process of the character edge is therefore fuller and the contour lines are clearer, which can effectively reduce the problem of blurred or discontinuous character boundaries caused by too fast pressing. This control method has strong adaptability for application scenarios that require the presentation of three-dimensional contours or have high requirements for character consistency.

[0057] After pressing is complete, the stamping die frame automatically rises back to its original position, freeing space for the next stamping cycle and preventing accidental contact between the die frame and the substrate before it is fully withdrawn. This action frees up space in the die frame, allowing the next plate substrate to enter the stamping area. The die frame's return also signals the end of the pressing phase, helping to guide subsequent steps like lettering erasure and die separation to proceed in the predetermined order, maintaining sequential connectivity between processes from a process organization perspective.

[0058] In some embodiments, in step S106, the type mold separation action is started after the stamping device completes the lifting of the stamping mold frame, and the type mold exits its original position under the drive of the mold frame release mechanism. The exit path is opposite to the type mold pushing path in direction and guides the type mold to the recovery area.

[0059] In the above embodiment, the die is ejected from the stamping die frame after the die frame is fully elevated. This time sequence allows the die separation to be separated from the die frame return process, thus avoiding interference with the process rhythm that might arise from initiating the die release operation before the pressing mechanism is fully elevated. Initiating the separation operation when the die frame is in a non-contact state helps reduce resistance during the die exit process, minimizes the impact of process actions, and improves the smoothness and consistency of the overall operation.

[0060] During the separation process, the die exits in a predetermined direction, opposite to the original direction of push. This path arrangement spatially separates entry and exit, allowing push and exit to proceed independently, thus reducing the potential for confusion caused by intersecting paths. By rationally defining the direction of entry and exit, the separation process is more directional and controllable, and also facilitates a seamless transition between the pressing and recycling processes.

[0061] Furthermore, after exiting the die, it is guided to a designated recycling area. This clear path allows the die to exit the stamping station promptly after completing the forming process, reducing heat accumulation or positioning interference caused by prolonged retention. At the same time, the setting of the guide path helps form a complete closed loop for the pressing process, from the initial pushing, pressing, lifting, to exit and recycling, thus realizing the complete process logic of the pressing operation. This process arrangement not only improves the clarity and controllability of the die's exit, but also facilitates subsequent recycling or replacement operations, thereby improving the consistency and efficiency of the entire processing process.

[0062] In some embodiments, in step S107, the erasing device includes a non-woven fabric component and a spray component arranged along the erasing path. The non-woven fabric component can make the non-woven fabric run continuously under the drive of the driving mechanism, and during the operation, it is in contact with the surface of the character area of the license plate substrate and remains in a tensioned state; the spray component is arranged below the non-woven fabric component, and the spray component includes a spray pipe arranged perpendicular to the conveying direction of the license plate substrate. The spray pipe is supplied with erasing liquid by the liquid supply system, and a plurality of upward atomizing nozzles are provided on the spray pipe for evenly spraying the erasing liquid onto the lower surface of the non-woven fabric.

[0063] In this embodiment, a nonwoven fabric assembly equipped with a drive mechanism maintains continuous movement and appropriate tension during the erasing process. The nonwoven fabric moves at a constant speed across the character area, creating a relatively flat and stable contact surface. Compared to static or intermittent motion, continuous movement creates a more consistent friction effect, thereby enhancing ink removal from the character area. Furthermore, the constant tension effectively reduces wrinkling and floating, improves the uniformity of adhesion in the erasing area, and enhances the overall treatment effect.

[0064] The spray assembly, positioned beneath the nonwoven fabric assembly, serves as the starting point for the erasing liquid's path. The spray pipe is arranged perpendicular to the plate substrate's transport direction, and the erasing liquid is delivered to the spray pipe by a liquid supply system. This vertical arrangement allows the spray liquid to preferentially cover the entire width of the nonwoven fabric, creating a uniform wetting surface in the transverse direction. This spraying method facilitates controllable spray paths, minimizing uneven coverage caused by liquid drift. It also facilitates coordinated layout with the device's internal spatial structure, minimizing interference between components.

[0065] In addition, the spray pipe is equipped with multiple upward-facing atomizing nozzles, which are used to evenly spray the erasing liquid from bottom to top onto the lower surface of the non-woven fabric. This upward atomizing spray promotes the distribution of the liquid in a mist-like manner across the fiber layer, reducing the localized wet spots caused by concentrated spraying. It also allows for a wider absorption range of the liquid, forming a continuous wet zone. During the operation of the non-woven fabric, the distribution concentration of the erasing liquid remains relatively even, which facilitates consistent subsequent erasing. Furthermore, this structural arrangement improves the efficiency of the erasing liquid, reduces liquid waste, and lays the foundation for uniform display of the character area, thereby improving the clarity and visual consistency of the erased text to a certain extent.

[0066] In some embodiments, in step S107, the non-woven fabric component drives the non-woven fabric for erasing to move in a direction opposite to the conveying direction of the license plate substrate. The non-woven fabric and the license plate substrate maintain consistent linear speeds during the bonding process, forming a relative sliding erasing action. A liquid collection tank is provided under the spray pipe to collect the erasing liquid that is not absorbed by the non-woven fabric and guide it back to the liquid supply system.

[0067] In this embodiment, the nonwoven fabric assembly drives the nonwoven fabric along a path opposite to the direction of the license plate substrate's transport. This reverse arrangement creates a clear relative sliding path within the contact area, enhancing the friction and contact range during the erasing process. Compared to the same-direction motion mode, reverse operation is more conducive to generating shear force, especially on the raised areas of the characters, where the ink layer attached to the surface can be more effectively scraped off. Furthermore, the reverse structure also reduces the problem of repeated friction on the same area, thereby helping to improve erasure efficiency and process uniformity.

[0068] In terms of motion coordination, the nonwoven fabric and the license plate substrate are set to maintain a consistent linear speed during the lamination process. This matching relationship is conducive to achieving a stable contact state and a balanced action time. If there is a difference in speed between the two, it may cause jumping, tearing, or uneven pulling, thus affecting the overall quality of the erased characters. By controlling the linear speed to be consistent, the friction of the nonwoven fabric on the character area can be applied more smoothly to the entire character outline, thereby reducing the phenomenon of erased characters not being in place or rubbing through the base color, helping to improve the recognizability of the character outline and the color rendering effect.

[0069] In addition, a liquid collection tank is provided below the spray pipe assembly to receive the erasing liquid that is not absorbed by the non-woven fabric and guide it back to the liquid supply system. This structure allows liquid resources to be recycled, which not only reduces the consumption of erasing liquid but also reduces the amount of residual liquid inside the equipment. After the liquid is collected, it is prevented from being retained at the bottom of the equipment, further reducing the risk of corrosion to components and facilitating subsequent cleaning and maintenance. The collection system and the liquid supply system are connected by a closed-loop pipeline, forming a continuous and stable reflux mechanism, making the spray liquid supply process more continuous and controllable, thereby supporting the efficient operation of the entire erasing process.

[0070] In some embodiments, in step S108, during the discharging process, the automatic sealing device starts working after the lettering is erased, automatically outputs the pre-packaged sealing screw assembly for installing the license plate, and transports the screw assembly together with the license plate substrate after the lettering is erased to the collection station.

[0071] In this embodiment, after the lettering erasure process is complete, the license plate substrate continues to be transported backward along a guide track into the discharge area. This guide path connects with the structure of the preceding process, ensuring smooth reception of the erased license plate substrate without interrupting transport, minimizing deviation or tilting caused by unstable transport. Upon arrival at the discharge area, the automatic sealing device activates, dispensing the pre-assembled sealing screw assembly required for license plate installation.

[0072] This automatic sealing device centrally delivers a group of pre-packaged sealing screw assemblies to a collection station along with the corresponding license plate substrates. By combining the erased license plate substrates with the required sealing components in the same process, it facilitates the synchronization of subsequent installation or packaging, reduces manual batching, and improves coordination efficiency and supply consistency during the discharge process.

[0073] After the sealing components are delivered, the conveyor mechanism guides the license plate substrate and corresponding screw assembly to the collection station, forming a closed-loop output process from lettering completion to component delivery. This processing sequence maintains a consistent rhythm between each stage, reduces the risk of confusion or missing components during the discharge process, and helps improve overall production efficiency and standardize material management.

[0074] In addition, if Figure 2 and Figure 3 As shown, the embodiment of the present application further provides a motor vehicle license plate pressing device, which is applied to the motor vehicle license plate pressing method provided in the embodiment of the present application. The motor vehicle license plate pressing device includes a loading module 100, a stamping module 200, an erasing device 300 and a discharging module 400 connected in sequence, wherein: The loading module 100 includes a loading device 110, a weighing device 120 and a manipulator device 130. The loading device is used to transport the license plate substrate to the weighing device in sequence. The weighing device is used to perform quality inspection on the license plate substrate. The manipulator device is used to grab the license plate substrate that has passed the weighing and transfer it to the positioning station of the stamping module.

[0075] The stamping module 200 includes a font library 210, a license plate font pushing device 220, a stamping device 230 and a license plate font separation device 240. The font library 210 is used to store character fonts. The license plate font pushing device 220 is used to push the selected font along the path into the stamping die frame of the stamping device 230. The stamping device 230 is provided with a stamping die frame with a lifting function, which is used to press the font onto the surface of the license plate substrate to form raised characters. The license plate font separation device 240 is used to withdraw the font from the stamping die frame after stamping.

[0076] The erasing device 300 includes a non-woven fabric component arranged on the erasing path and a spray pipe assembly located below it. The non-woven fabric component is arranged to be in contact with the surface of the license plate substrate and move in a direction opposite to the direction of license plate transmission. The spray pipe assembly is used to spray the erasing liquid upward to the lower surface of the non-woven fabric to directionally erase the outermost layer of ink in the raised character area during the transmission of the license plate.

[0077] The discharging module 400 includes an automatic sealing device, which is used to output pre-packaged sealing screw components and transport them to a collection area together with the license plate substrate with erased characters.

[0078] The loading module 100, the punching module 200, the erasing device 300 and the discharging module 400 are arranged in sequence along the license plate processing path and are connected by a conveying structure to form a continuous processing flow channel.

[0079] In this embodiment, a sequentially connected loading module 100, stamping module 200, erasing device 300, and discharging module 400 form an integrated device for pressing motor vehicle license plates with a continuous process and a clear path. The loading module 100 includes a loading device 110, a weighing device 120, and a manipulator 130, which sequentially complete the operations of substrate conveying, quality inspection, and the capture and transfer of qualified substrates. This modular combination ensures that each license plate substrate is transferred in a predetermined order, reducing positional deviations caused by switching during the transfer process and improving the operational stability and alignment accuracy of the license plate substrates during the initial processing phase.

[0080] Furthermore, the stamping module 200 is composed of a font library 210, a font pushing device 220, a stamping device 230 and a font separation device 240, and has a complete character pressing process. After the license plate substrate to be processed enters the stamping area, the font pushing device 220 calls out the target font from the font library 210 and pushes it into the mold frame of the stamping device 230 along a preset trajectory. The stamping mold frame has a lifting function, which can press the font to the surface of the license plate substrate after startup, thereby forming the required raised characters. After the stamping action is completed, the font is withdrawn from its original position through the font separation device 240 to avoid long-term stay and affecting subsequent actions. The coordination relationship between the various components of the stamping module is clear, which can maintain the stability of the processing rhythm and help improve the repeatability of character forming.

[0081] The erasing device 300 also features an upper and lower structure, with the upper portion comprising a non-woven fabric assembly and the lower portion comprising a spray pipe assembly. During operation, the non-woven fabric assembly adheres to the surface of the character area, running in a direction opposite to the direction of transport of the license plate substrate. The spray pipe is positioned below this assembly and equipped with multiple upward-facing nozzles, which spray the erasing liquid from bottom to top onto the back of the non-woven fabric. This structural arrangement allows the erasing liquid to first evenly penetrate the non-woven fabric fibers, and then, through sliding contact between the non-woven fabric and the character area, achieves targeted erasure of the ink on the surface of the characters. This approach helps to improve issues such as unclear color development and incomplete wiping caused by uneven friction or unstable liquid supply during traditional erasing.

[0082] Furthermore, the discharging module 400 is equipped with an automatic sealing device for discharging the sealing screw assembly used with the license plate after the lettering is erased. This automatic sealing device is adapted to the sealing requirements of current license plate installation processes and automatically delivers the screw assembly, packaged to specifications, to the collection area along with the erased license plate substrate. By integrating this device into the discharging module, the matching screws and corresponding license plates can be delivered together in the same process, improving the consistency of process ingredients and the coordination of assembly preparation.

[0083] The above-mentioned automatic sealing device has been widely adopted in industrial practice. It is a conventional automatic discharging device used for the centralized supply of standard parts. Its structural form is mostly independent modules or embedded integrated units. Its main function is to output pre-packaged sealing components to downstream workstations on demand, reducing manual sorting and material retrieval operations, and improving the efficiency and accuracy of the delivery of supporting parts. Combined with the continuous processing path of this embodiment, the automatic sealing device and the discharging end of the erasing device form a functional coordination to achieve the unified output of license plates and their required mounting parts in the conveyor chain, avoiding rhythm interference or material mismatch problems caused by manual replenishment.

[0084] Through this structural setting, this embodiment can incorporate the sealing parts distribution process that originally needed to be completed separately into the overall processing system, making the delivery of license plates and accessories a part of the production line, which helps to improve the standardization level of subsequent assembly, packaging or logistics links, and also enhances the consistency and preparation completeness of the license plate products when they leave the factory. Overall, the introduction of this device is an effective extension of the last process after the wiping is completed, and reflects the integration capability of this embodiment in automatic batching and transportation coordination. Overall, this embodiment has constructed a continuous processing flow with clear processing logic through the structural layout and functional division of labor between modules, which is suitable for motor vehicle license plate production scenarios with high requirements for production line stability and character consistency.

[0085] In the actual application process of this application, the following points should be noted to ensure the stable operation of the motor vehicle license plate pressing method and device in engineering scenarios: First, when implementing the pressing method, it's recommended to rationally adjust the timing of each process—loading, weighing, transfer, stamping, erasing, and discharging—according to the actual production line's operating rhythm. In particular, during the transition between the robotic gripper and the lowering of the stamping die frame, appropriate buffer zones or state-determination logic should be implemented to avoid disruptions in the rhythm caused by poor equipment linkage.

[0086] Secondly, the non-woven fabric and erasing liquid used in the erasing process must be selected based on the specific formula and thickness of the ink layer in the character area. If the erasing liquid concentration is too low, the fabric tension is insufficient, or the spray volume is uneven, it may cause unclear color at the edge of the character or wipe residue. Therefore, it is recommended to regularly test the erasing effect in actual application and replace consumables in a timely manner to maintain erasure consistency.

[0087] Furthermore, during the unloading process, the automatic sealing device activates after the lettering is erased. Its function is to discharge the pre-packaged sealing screw components that match the license plates. To ensure smooth connection between unloading and previous processing, the trigger logic and output interval should be properly configured to avoid component jams and license plate backlogs. It is recommended to match the parameters based on the production line operating speed and the component supply rate to improve the synchronization of the overall transmission rhythm.

[0088] The license plate pressing method and device provided in the embodiments of the present application have good operational stability and structural adaptability in production practice, and are suitable for technical integration and functional expansion of existing automated license plate production lines.

[0089] It should also be noted that the motor vehicle license plate pressing method provided in the embodiment of the present application is not limited to being implemented in combination with the specific device structure described in this specification. For integrated equipment with functional modules such as character stamping, word erasure processing, and sealing component supply, as long as it is structurally capable of completing the key processing operations in each step of the method of the present application, and has the corresponding action execution logic and process coordination mechanism, it also falls within the scope of application of the pressing method described in the present application. Therefore, designing a license plate pressing system with integrated characteristics based on the process flow proposed in this application, or functionally integrating existing equipment to meet the requirements of this method, should be regarded as feasible implementation paths for this method. Such structural adaptation and adjustment are technical extensions that can be completed by those skilled in the art without the need for creative labor.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for pressing a motor vehicle license plate, characterized in that: The following steps are involved: Step 1: Loading: The license plate substrate is fed into the loading channel in sequence through the loading device, and then transported along the loading channel to the location of the weighing device; Step 2: Weighing: The quality of the license plate substrate is tested using a weighing device installed on the feeding channel. The license plate substrates that exceed the set quality range are rejected. Step 3, Transfer: The robot device will grab the qualified license plate substrates in sequence, and transport them to the stamping area along the preset path, and place them on the corresponding positioning station of the stamping die frame to complete the alignment; Step 4: Font assembly: retrieve the target character font from the font library module, push the font along the preset path into the stamping die frame through the font pushing device and complete the positioning; Step 5: Stamping: The stamping die frame is controlled to descend by a stamping device equipped with a lifting drive mechanism, so that the character mold is pressed onto the surface of the license plate substrate to form raised characters; Step 6: Separation of the mold: After the stamping is completed, the mold is removed from the mold frame through the license plate mold separation device to separate it from the license plate substrate; Step 7: Erasing: The stamped license plate substrate is fed into the erasing device, where a non-woven fabric moving in the opposite direction of the substrate is adhered to the surface of the character area. At the same time, an erasing liquid is sprayed onto the non-woven fabric from bottom to top through a spray pipe provided below the non-woven fabric, so that the ink on the surface of the character area is erased in a targeted manner, revealing the base color and enhancing recognizability. Step 8: Discharging: After the lettering is erased, the pre-packaged sealing screw assembly for installing the license plate is discharged through the automatic sealing device, and the erased license plate substrate and the pre-packaged sealing screw assembly are transported to the collection station to complete the process; During the erasing process, the non-woven fabric is in a tensioned state and moves continuously. After the erasing liquid is sprayed, it is partially absorbed by the non-woven fabric, and the remaining liquid flows back to the liquid supply system for recycling.

2. The method for pressing a motor vehicle license plate according to claim 1, wherein: In step 1, the license plate substrate is continuously transported along the loading path to the location of the weighing device under the drive of the loading device. During the weighing detection process, the license plate substrate remains in a continuous motion state. The weighing device completes the quality detection and outputs a detection signal to determine whether it is qualified.

3. The method for pressing a motor vehicle license plate according to claim 2, wherein: In step 3, the manipulator device starts the grabbing action after receiving the qualified signal from the weighing device. The grabbed license plate substrate is transferred to the stamping area along the transverse track and falls on the positioning station below the stamping die frame.

4. The method for pressing a motor vehicle license plate according to claim 1, wherein: In step 4, the font pushing device starts working after the robot device completes the license plate substrate placement action, pushes the selected font along the preset guide path into the stamping die frame, and makes the font stay at the set positioning position of the stamping die frame.

5. The method for pressing a motor vehicle license plate according to claim 1, wherein: In step 5, the stamping process includes the following actions: after the stamping device is started, the stamping die frame descends at a uniform speed to the contact position with the license plate substrate, continues to press for a specified time under the set pressure maintenance state, and then controls the die stamping frame to lift back to its original position.

6. The method for pressing a motor vehicle license plate according to claim 5, characterized in that: In step 6, the type mold separation action starts after the punching device completes the lifting of the punching die frame. The type mold exits its original position under the drive of the die frame release mechanism. The exit path is opposite to the type mold pushing path in direction and guides the type mold to the recovery area.

7. The method for pressing a motor vehicle license plate according to claim 1, wherein: In step 7, the erasing device includes a non-woven fabric component and a spray component arranged along the erasing path. The non-woven fabric component can make the non-woven fabric run continuously under the drive of the driving mechanism, and adhere to the surface of the character area of the license plate substrate and maintain a tensioned state during the operation; the spray component is arranged below the non-woven fabric component, and the spray component includes a spray pipe arranged perpendicular to the transmission direction of the license plate substrate. The spray pipe is supplied with erasing liquid by the liquid supply system, and a plurality of upward atomizing nozzles are provided on the spray pipe for evenly spraying the erasing liquid onto the lower surface of the non-woven fabric.

8. The method for pressing a motor vehicle license plate according to claim 7, characterized in that: In step 7, the non-woven fabric component drives the non-woven fabric for erasing to move in a direction opposite to the conveying direction of the license plate substrate. The non-woven fabric and the license plate substrate maintain the same linear speed during the bonding process, forming a relative sliding erasing action. A liquid collection tank is provided under the spray pipe to collect the erasing liquid not absorbed by the non-woven fabric and guide it back to the liquid supply system.

9. The method for pressing a motor vehicle license plate according to claim 1, wherein: In step 8, during the discharging process, the automatic sealing device starts working after the lettering is erased, automatically outputs the pre-packaged sealing screw assembly for installing the license plate, and transports the screw assembly together with the license plate substrate after the lettering is erased to the collection station.

10. A motor vehicle license plate pressing device, characterized in that: The motor vehicle license plate pressing method according to any one of claims 1 to 9, wherein the motor vehicle license plate pressing device comprises a loading module, a stamping module, an erasing device and a discharging module connected in sequence, wherein: The loading module includes a loading device, a weighing device and a manipulator device. The loading device is used to sequentially convey the license plate substrate to the weighing device. The weighing device is used to perform quality inspection on the license plate substrate. The manipulator device is used to grab the license plate substrate that has passed the weighing and transfer it to the positioning station of the stamping module. The stamping module includes a character library, a license plate character mold pushing device, a stamping device and a license plate character mold separation device, the character library is used to store character character molds, the license plate character mold pushing device is used to push the selected character mold along the path into the stamping die frame of the stamping device, the stamping device is provided with a stamping die frame with a lifting function, which is used to press the character mold onto the surface of the license plate substrate to form raised characters, and the license plate character mold separation device is used to withdraw the character mold from the stamping die frame after stamping; The erasing device includes a non-woven fabric component arranged on the erasing path and a spray pipe component located below the non-woven fabric component. The non-woven fabric component is arranged to be in contact with the surface of the license plate substrate and to move in a direction opposite to the direction in which the license plate is conveyed. The spray pipe assembly is used to spray the erasing liquid upward onto the lower surface of the non-woven fabric to directionally erase the outermost layer of ink in the raised character area during the conveyance of the license plate. The discharging module includes an automatic sealing device for discharging pre-packaged sealing screw assemblies and conveying them to a collection area together with the erased license plate substrate. The loading module, the punching module, the erasing device and the discharging module are arranged in sequence along the license plate processing path and are connected by a transmission structure to form a continuous processing flow channel.

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