A laser engraving device for signboard processing

Abstract

The present application relates to the technical field of laser engraving, and particularly relates to a laser engraving device for signboard processing, which comprises a laser engraving machine and a supporting table installed on the laser engraving machine, and further comprises: pressing air supply assemblies symmetrically distributed on the top of the supporting table and used for pressing the edges of a plate and simultaneously blowing and sucking air on the top surface of the plate or on the top surface and the bottom surface of the plate; and L-shaped limiting frames symmetrically distributed near the corners of the supporting table and used as coordinate references and for determining the corners of the plate, wherein the device can effectively eliminate the warping problem caused by the internal stress of the non-metal plate and avoid the problem that the processing area is in a defocusing state due to the fluctuation of the plate during the engraving process by pressing the edges of the plate on both sides through the symmetrically distributed pressing air supply assemblies and by flattening and pressing the plate on the surface of the supporting table through the multi-point cooperation.

Description

Technical Field

[0001] This invention relates to the field of laser engraving technology, and more specifically to a laser engraving device for sign processing. Background Technology

[0002] Laser engraving is a process technology that uses a high-energy light beam to melt or vaporize the surface of a material instantly, thereby achieving non-contact precision processing. In the advertising industry, plastic products are generally used as substrates to engrave the desired patterns, text, or combinations thereof to achieve the purpose of advertising.

[0003] Existing application number CN202321374494.0 discloses a laser engraving machine, which includes a frame, an XY moving mechanism, a laser engraving head, a lifting mechanism, and a lifting platform. The frame has a processing cavity, and the XY moving mechanism drives the laser engraving head to move within the processing cavity. Dust baffles are provided on both sides of the processing cavity, and the lifting mechanism is located outside the dust baffles. The frame is also equipped with an air blowing mechanism, which includes an air blowing pipe and an air blowing head. This invention solves the technical problem in the prior art where debris falls on products and other parts of the equipment, affecting normal processing and product quality. It reduces debris falling on products and equipment parts, improves equipment cleanliness, reduces labor costs, and increases production efficiency.

[0004] Acrylic and related plastic products are widely used in the advertising industry. After laser engraving, combined with lighting and other technologies, they can display aesthetically pleasing advertising content. However, due to the transparent nature of acrylic and similar plastic products, problems such as yellowing and scorching of the cut edges are prone to occur during laser engraving if the engraving machine is not selected correctly. The main reasons for these problems are that the oxidation reaction during the engraving process cannot be suppressed and the slag is not removed in time. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a laser engraving device for sign processing, which can effectively solve the problems of edge scorching or yellowing of plastic products during laser engraving.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a laser engraving device for sign processing, comprising a laser engraving machine and a support platform mounted on the laser engraving machine, and further comprising: The pressing ventilation components are symmetrically distributed on the top of the support platform and are used to press the edges of the board and to blow and suck air on the top surface of the board or the top and bottom surfaces at the same time. The L-shaped limit frame is distributed in an L-shape at the corner of the support platform and is used as a coordinate reference to determine the corner of the plate.

[0007] Furthermore, the compression ventilation assembly includes two connecting frames symmetrically installed on the top of the support platform. A compression plate is slidably inserted into each of the two connecting frames. An electric push rod is fixedly connected to the top plate of the connecting frame. The output end of the electric push rod faces downward and is fixedly connected to the horizontal plate of the compression plate. The horizontal plate of the compression plate is used to compress the plate material.

[0008] Furthermore, an air guide pipe is embedded and fixedly connected above one side plate of the two connecting frames, and the air guide pipe is used to connect to an air intake or air blowing device; The vertical plate of the pressing plate is slotted and a movable plate is connected to the bottom of the vertical plate of the pressing plate, and an air passage is formed between the movable plate and the horizontal plate of the pressing plate.

[0009] Furthermore, two linear motors are symmetrically fixedly connected to the top of the support platform, and one of the connecting frame bodies is fixedly connected to the moving ends of the two linear motors at both ends; The compression ventilation assembly connected to the linear motor is offset from the L-shaped limit frame for air intake, and the back of the connecting frame of the compression ventilation assembly is hinged with a sealing plate that seals with the connecting frame.

[0010] Furthermore, servo motors are embedded and fixedly connected to both sides of the vertical plate of the pressing plate. The servo motors are connected to the movable plate for driving control of the angle between the movable plate and the horizontal plate of the pressing plate.

[0011] Furthermore, multiple guide plates are fixedly connected to the top of the horizontal plate of the pressing plate to guide the airflow. The front end of the guide plate has an inclined surface to guide the plate to slide upward.

[0012] Furthermore, the support platform includes a plurality of guide plates fixed on the laser engraving machine and spaced below, with the output end facing upward and fixedly connected, which together or only support the plate with the horizontal plate of the pressing plate.

[0013] Furthermore, the L-shaped limiting frame includes an L-shaped plate 1 fixedly installed on the top of the support platform and multiple electric push rods 2 installed inside the laser engraving machine. The output end of the electric push rod 2 passes through the L-shaped plate 1 and is fixedly connected to the L-shaped plate 2. A pressure rod 1 is fixedly connected to the L-shaped plate 2 by bolts, and the end of the pressure rod 1 is fixedly connected to the pressure rod 2 by bolts.

[0014] The technical solution provided by this invention has the following advantages compared with the known prior art: 1. The device uses symmetrically distributed pressing and ventilation components to press the edges of the sheet metal on both sides. This multi-point collaborative pressing method effectively eliminates warping caused by the internal stress of the non-metallic sheet metal and prevents the processing area from becoming out of focus due to sheet metal undulations during engraving. It eliminates the need to compensate for insufficient energy density by increasing the overall laser power, thus reducing heat damage defects such as large-area yellowing and carbonization caused by excessive power. Simultaneously, it ensures uniform engraving depth, improving the clarity of graphic boundaries and processing dimensional accuracy. This fixing method is particularly suitable for processing extruded sheets with high internal stress, stably maintaining the sheet metal shape, suppressing deformation caused by heat release, reducing dimensional deviations after processing, and effectively improving the yield and consistency of finished products.

[0015] 2. The pressurized ventilation component creates a stable airflow channel on the top surface of the sheet metal, with air blowing on one side and air intake on the other. This channel can directionally remove high-temperature fumes, molten beads, and processing debris generated during laser engraving, preventing oxidation, yellowing, and edge carbonization caused by prolonged exposure to high temperatures at the sheet metal cut edges. It also prevents molten residue from adhering to the edges of the graphics. Simultaneously, the airflow can directionally guide the fumes, preventing them from splashing and adhering to the sheet metal surface to form a difficult-to-wipe mist-like stain.

[0016] 3. With the support platform's lifting structure, the board can be lifted into the airflow channel, allowing the airflow to cover both the top and bottom surfaces of the board simultaneously. This is suitable for scenarios where smoke and debris are generated on both sides during thin plate penetration cutting and other processing. It achieves simultaneous dust removal and heat dissipation on both sides without the need for additional bottom air passage structures, simplifying equipment configuration while expanding the processing application range, and taking into account the two core processing needs of planar engraving and penetration cutting.

[0017] 4. The directional suction design can collect the flue gas generated during processing in a concentrated manner, which can reduce the probability of flue gas diffusing into the equipment, reduce the corrosion of optical lenses, metal guide rails and optical components by corrosive flue gas, slow down the aging of the equipment, extend the service life of the equipment, and at the same time reduce the diffusion of harmful flue gas and improve the working environment of operators. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the support platform and the compression ventilation assembly of the present invention; Figure 3 This is a schematic diagram of the structure of the compression ventilation component and the support platform of the present invention; Figure 4 This is a schematic diagram of the separation of the compression ventilation component of the present invention after half-section. Figure 5 This is a schematic diagram of the pressing plate of the present invention; Figure 6 This is a half-sectional structural diagram of the compression ventilation component of the present invention; Figure 7 This is a schematic diagram of the operation of the support platform of the present invention; Figure 8 This is a schematic diagram of the L-shaped limiting frame of the present invention.

[0020] The labels in the diagram represent: 1. Laser engraving machine; 2. Support platform; 201. Base; 202. Support bar; 203. Electric push rod three; 3. Pressing and ventilation assembly; 301. Connecting frame; 302. Pressing plate; 303. Electric push rod one; 304. Movable plate; 305. Guide plate; 306. Sealing plate; 307. Air duct; 308. Servo motor; 4. Linear motor; 5. L-shaped limit frame; 501. L-shaped plate one; 502. L-shaped plate two; 503. Electric push rod two; 504. Pressure rod one; 505. Pressure rod two. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] The present invention will be further described below with reference to embodiments.

[0023] Reference Figures 1 to 8 Example: A laser engraving device for sign processing includes a laser engraving machine 1 and a support platform 2 mounted on the laser engraving machine 1, and further includes: The pressing ventilation component 3 is symmetrically distributed on the top of the support platform 2. It is used to press the edge of the board and to blow and suck air on the top surface of the board or the top and bottom surfaces at the same time.

[0024] Currently, the non-metallic materials used in the signage industry are primarily acrylic, two-color boards, and PVC boards, supplemented by niche customized materials such as wood panels, glass, and stone, covering a full range of needs from high-end illuminated signs to ordinary doorplates and temporary display boards. Among these, acrylic, also known as plexiglass, is the core material with the largest overall usage. Higher-quality cast acrylic is mostly used for high-end illuminated letters, crystal letters, and transparent signs, while lower-cost extruded acrylic mainly targets the ordinary sign and lightbox panel market. Two-color boards are the preferred material for small-sized flat signs, relying on the color contrast between the surface colored film and the underlying contrasting substrate to form clear graphics and text, and are widely used in scenarios such as department signs, doorplates, name badges, and equipment nameplates. PVC boards, also known as PVC foam boards, are mostly used for outdoor display boards, sign back panels, and 3D lettering due to their low cost and ease of processing, and are the main material for mid-to-low-end outdoor signage.

[0025] These types of non-metallic materials are generally engraved and cut using CO2 lasers. Most problems encountered during processing revolve around the laser's thermal effect, with different materials exhibiting different characteristics but sharing many commonalities. The most critical common problem is appearance defects caused by heat damage: acrylic is prone to oxidation at high temperatures, often resulting in yellowing and carbonization at the cut edges. When cutting thick plates, molten beads easily accumulate at the bottom, and the inner walls of the cut are also prone to yellowing. High-temperature fumes generated during processing splash onto the surface of the board, forming a difficult-to-wipe, hazy, yellowish-brown stain. Extruded boards with high internal stress may also warp and exhibit dimensional deviations due to heat release. The surface film of two-color boards is extremely thin, requiring very high parameter precision. Excessive power can lead to surface melting and fraying at the edges, and roughening of the graphic boundaries; insufficient power fails to fully expose the base color. Molten plastic residue from engraving easily adheres to the edges of the graphics, easily scratching the surface film during cleaning. Processing PVC boards releases corrosive chlorine fumes, which irritate the respiratory tract, harm the health of operators, and slowly corrode optical lenses, metal rails, and optical components of equipment, accelerating equipment aging. Additionally, cut edges are prone to melting and foaming, resulting in rough surfaces. Wood and MDF, on the other hand, are prone to uneven carving depth, blackened edges, and their porous structure easily traps dust and residue, making subsequent cleaning difficult.

[0026] Therefore, the laser engraving machine 1 is equipped with relatively distributed pressing and ventilation components 3. Firstly, before engraving, the two sides and four corners of the board are pressed to ensure that the board is flat during laser engraving. This avoids warping, which would cause the focal length to change in real time during the cutting process, resulting in most areas being out of focus and insufficient energy density. This would only be compensated for by increasing the overall power, ultimately leading to large-area yellowing. At the same time, the pressing and ventilation components 3 are connected to an external air source. One pressing and ventilation component 3 blows air, and another pressing and ventilation component 3 draws air, forming a stable airflow channel on the top surface of the board. This carries away the heat and debris generated during laser engraving, preventing the board from carbonizing and yellowing during engraving. Correspondingly, protective gas can also be provided during the air supply, so that the top and bottom surfaces of the board are covered by protective gas. This ensures heat dissipation and blows away debris during laser engraving, while also making the board extremely difficult to oxidize.

[0027] One of the pressure ventilation components 3 blows air, while the other pressure ventilation component 3 draws air. During the blowing process, the smoke or debris will be blown and moved. Therefore, the carving direction needs to be adjusted according to the blowing direction to avoid the smoke or debris moving to the area to be carved, that is, to avoid blowing the smoke or debris towards the place to be carved.

[0028] Specifically, the compression ventilation assembly 3 includes two connecting frames 301 symmetrically installed on the top of the support platform 2. A compression plate 302 is slidably inserted into each of the two connecting frames 301. An electric push rod 303 is fixedly connected to the top plate of the connecting frame 301. The output end of the electric push rod 303 faces downward and is fixedly connected to the horizontal plate of the compression plate 302. The horizontal plate of the compression plate 302 is used to compress the plate material.

[0029] The pressing plate 302 is shaped like an inverted T. Its horizontal plate part contacts the connecting frame 301 and maintains a sealed state. The vertical plate part of the pressing plate 302, which is slidably connected to the connecting frame 301, is also equipped with a sealing strip to ensure a sealed state.

[0030] The material to be engraved is placed on top of the support platform 2, and one corner of the material should be locked onto the L-shaped limiting frame 5 so that the two fit together. Then, the electric push rod 303 drives the pressing plate 302 to move downward. The horizontal part of the pressing plate 302 presses down on the two edges of the material, including the corner of the material. By pressing, the material is forced to be pressed on top of the support platform 2 and presented in a flat state. This avoids the problem of the engraved part being out of focus during the laser engraving process due to the warped material, which would result in poor engraving effect.

[0031] Specifically, an air guide pipe 307 is embedded and fixedly connected above one side plate of the two connecting frames 301. The air guide pipe 307 is used to connect to an air intake or air blowing device. The vertical plate of the pressing plate 302 is slotted and the bottom of the vertical plate of the pressing plate 302 is connected to a movable plate 304. An air passage is formed between the movable plate 304 and the horizontal plate of the pressing plate 302.

[0032] When the pressing plate 302 completes the pressing, it is positioned above the plate. Externally, negative pressure or air pressure is provided to the space between the connecting frame 301 and the pressing plate 302 through the air guide pipe 307 to perform blowing or suction actions. This part covers the top of the plate, so the airflow channel is located above the plate. In this way, when laser engraving characters or patterns, the airflow can blow away the molten fragments and high-temperature fumes generated during laser engraving, and quickly suck them away through the negative pressure channel between the pressing plate 302 and the movable plate 304 on the other side, avoiding the residue of fumes or molten fragments. The synchronous operation of blowing and suction is conducive to forming a stable flow area on the top of the plate.

[0033] Specifically, two linear motors 4 are symmetrically fixedly connected to the top of the support platform 2, and the two ends of one of the connecting frames 301 are fixedly connected to the moving ends of the two linear motors 4; the compression ventilation component 3 connected to the linear motor 4 is offset from the L-shaped limiting frame 5 and is used for air intake, and the back side of the connecting frame 301 of the compression ventilation component 3 is hinged with a sealing plate 306 that seals the connecting frame 301.

[0034] The linear motor 4 is installed on both sides of the pressing and ventilation assembly 3, so it needs to be staggered with the L-shaped limiting frame 5. Therefore, the connecting frame 301 connected to the linear motor 4 should be wider. Thus, the area between the horizontal plate of the pressing plate 302 and the movable plate 304 in the connecting frame 301 is used for air intake, while the area between the pressing plate 302 and the movable plate 304 on the other side is narrower, suitable for air blowing. In this way, the narrow part blows air and the wide part absorbs air, allowing the airflow to flow stably into the intake area. If the configuration is reversed, the airflow will be more easily turbulent when blowing air into the wide part, and the intake area will be insufficient, which is not conducive to the stable guidance of the airflow. The sealing plate 306 is installed behind the pressing plate 302 that performs air intake. When the machine stops, the sealing plate 306 can be opened to open the space between the connecting frame 301 and the pressing plate 302, making it convenient to clean the inside and remove the attached smoke and other debris.

[0035] Multiple guide plates 305 are fixedly connected to the top of the horizontal plate of the pressing plate 302 to guide the airflow. The front end of the guide plate 305 has a slope to guide the plate to slide upward.

[0036] The space between the horizontal plate portion of the pressing plate 302 and the movable plate 304 is used for airflow. The provision of multiple guide plates 305 can help guide the airflow and reduce turbulence at the ends of the movable plate 304 and the pressing plate 302.

[0037] Driven by the linear motor 4, the connecting frame 301 can move the pressing plate 302 and other components upwards towards the plate. While the connecting frame 301 moves, the electric push rod 303 can control whether the pressing plate 302 is in contact with the top surface of the support platform 2. If laser cutting of a thin plate is required, the electric push rod 303 can be first controlled to contact the top surface of the support platform 2 and move to a suitable position. Then, the plate is placed on top of the guide plates 305 on the base plates of the two pressing plates 302. Next, the laser engraving machine 1 performs laser cutting, and the two air pipes 307... Do not connect the suction and blowing equipment to perform the blowing and suction actions. At this time, the plate is at the top of the guide plate 305, that is, the plate is between the horizontal plate part of the pressing plate 302 and the movable plate 304. Therefore, the airflow generated by blowing and suction will be distributed on the top and bottom of the plate. During the laser cutting process, the plate is cut, and the distribution of smoke or debris will pass through the upper and lower sides of the plate. The airflow channels covering the upper and lower surfaces of the plate can quickly remove high-temperature smoke and debris and other small substances, ensuring a good laser cutting environment and thus ensuring the laser cutting effect.

[0038] Specifically, servo motors 308 are embedded and fixedly connected to both sides of the vertical plate of the pressing plate 302. The servo motors 308 are connected to the movable plate 304 for transmission and are used to control the angle between the movable plate 304 and the horizontal plate of the pressing plate 302.

[0039] If the gap between the horizontal plate portion of the pressing plate 302 and the movable plate 304 is used as an air intake space, the servo motor 308 should control the movable plate 304 to rotate and tilt upwards to increase the air intake range. Conversely, if it serves as an air blowing space, the servo motor 308 can appropriately control the movable plate 304 to rotate and tilt downwards to reduce the air outlet and increase the airflow speed. In scenarios with high heat dissipation requirements, the distance between the movable plate 304 and the horizontal plate portion of the pressing plate 302 at this position can be appropriately increased to increase the airflow.

[0040] Specifically, the support platform 2 includes a base 201 fixed on the laser engraving machine 1 and electric push rods 203 spaced apart below the base 201. The output end of the electric push rods 203 faces upward and is fixedly connected to a support strip 202. Multiple support strips 202 and the guide plate 305 on the horizontal plate of the pressing plate 302 together or only the support strips 202 support the plate.

[0041] When the two guide plates 305 support the sheet material, in order to avoid obstructed airflow at the bottom of the sheet material, the height of the pressing plate 302 can be appropriately controlled by the electric push rod 303. At the same time, the electric push rod 203 drives the support strip 202 to move upward and support the sheet material. It should be noted that the height of the support strip 202 and the two guide plates 305 should be the same. The support strip 202 must not be lower than the guide plate 305 to ensure that the support strip 202 can support the sheet material. Secondly, the two guide plates 305 should not be staggered, as this will cause the cut sheet material to not meet the requirements. Correspondingly, the support strip 202 should not exceed the guide plate 305, otherwise the sheet material will bend to some extent.

[0042] Specifically, the L-shaped limiting frame 5 is L-shaped and distributed near the corner of the support platform 2. It is used as a coordinate reference and to determine the corner of the plate. The L-shaped limiting frame 5 includes an L-shaped plate 501 fixedly installed on the top of the support platform 2 and multiple electric push rods 503 installed in the laser engraving machine 1. The output end of the electric push rod 503 passes through the L-shaped plate 501 and is fixedly connected to the L-shaped plate 502. A pressure rod 504 is fixedly connected to the L-shaped plate 502 by bolts. The end of the pressure rod 504 is fixedly connected to the pressure rod 505 by bolts.

[0043] The corner of the sheet material should be aligned with L-shaped plate 501. Using this position as a reference, after determining the position, electric push rod 503 controls L-shaped plate 502 to move down and uses pressure rods 504 and 505 to press the corner of the sheet material together. This, together with the pressure plate 302 installed on this side, presses one side of the sheet material. The angles between pressure rods 504 and L-shaped plate 502, and between pressure rods 504 and 505, can be adjusted by loosening the bolts to ensure the pressed area is covered and avoids the engraving area. After tightening the bolts, pressure rods 504 and 505 are fixed. In this case, the connecting frame 301 of the one-side pressing ventilation component 3 and the L-shaped plate 501 are on the same side, and the sum of the two is approximately equal to the width of the connecting frame 301 on the other side, so as to ensure the fit of the pressing of the edge of the board. No matter how the pressing plate 302 is pressed down, since the air duct 307 is at the high position of the connecting frame 301, the airflow will be above the board when the board is pressed by the pressing plate 302, without having to adjust the position of air outlet and air inlet according to the thickness of the board.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A laser engraving device for sign processing, comprising a laser engraving machine (1) and a support platform (2) mounted on the laser engraving machine (1), characterized in that, Also includes: The pressing ventilation component (3) is symmetrically distributed on the top of the support platform (2) and is used to press the edge of the board and to blow and suck air on the top surface of the board or the top and bottom surfaces at the same time. The L-shaped limit frame (5) is distributed in an L-shape at the corner of the support platform (2) and is used as a coordinate reference to determine the corner of the plate.

2. The laser engraving device for sign processing according to claim 1, characterized in that, The compression ventilation assembly (3) includes two connecting frames (301) symmetrically installed on the top of the support platform (2). A compression plate (302) is slidably inserted on each of the two connecting frames (301). An electric push rod (303) is fixedly connected to the top plate of the connecting frame (301). The output end of the electric push rod (303) faces downward and is fixedly connected to the horizontal plate of the compression plate (302). The horizontal plate of the compression plate (302) is used to compress the plate material.

3. The laser engraving device for sign processing according to claim 2, characterized in that, An air guide tube (307) is embedded and fixedly connected above one side plate of each of the two connecting frames (301). The air guide tube (307) is used to connect to an air intake or air blowing device. The vertical plate of the pressing plate (302) is slotted and the bottom of the vertical plate of the pressing plate (302) is connected to a movable plate (304), and an air passage is formed between the movable plate (304) and the horizontal plate of the pressing plate (302).

4. The laser engraving device for sign processing according to claim 3, characterized in that, The top of the support platform (2) is symmetrically fixedly connected to two linear motors (4), and the two ends of one of the connecting frames (301) are fixedly connected to the moving ends of the two linear motors (4). The compression ventilation assembly (3) connected to the linear motor (4) is offset from the L-shaped limit frame (5) for air intake, and the back of the connecting frame (301) of the compression ventilation assembly (3) is hinged with a sealing plate (306) that seals the connecting frame (301).

5. The laser engraving device for sign processing according to claim 3, characterized in that, The vertical plates of the pressing plate (302) are both embedded with fixed servo motors (308). The servo motors (308) are connected to the movable plate (304) for transmission and are used to control the angle between the movable plate (304) and the horizontal plate of the pressing plate (302).

6. A laser engraving device for sign processing according to claim 3 or 4, characterized in that, The top of the horizontal plate of the pressing plate (302) is fixedly connected with a plurality of guide plates (305) for guiding airflow. The front end of the guide plate (305) has an inclined surface for guiding the plate to slide upward.

7. The laser engraving device for sign processing according to claim 6, characterized in that, The support platform (2) includes a base (201) fixed on the laser engraving machine (1) and three electric push rods (203) spaced below the base (201). The output end of the electric push rods (203) is upward and fixedly connected to a support strip (202). The multiple support strips (202) together with the guide plate (305) on the horizontal plate of the pressing plate (302) or only the support strips (202) support the plate.

8. The laser engraving device for sign processing according to claim 4, characterized in that, The L-shaped limiting frame (5) includes an L-shaped plate (501) fixedly installed on the top of the support platform (2) and multiple electric push rods (503) installed in the laser engraving machine (1). The output end of the electric push rod (503) passes through the L-shaped plate (501) and is fixedly connected to the L-shaped plate (502). A pressure rod (504) is fixedly connected to the L-shaped plate (502) by bolts. The end of the pressure rod (504) is fixedly connected to the pressure rod (505) by bolts.

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