High-precision laser cutting table

Abstract

This invention relates to a high-precision laser cutting stage, belonging to the field of laser cutting technology. The invention includes a laser cutting head, a cutting platform below the laser cutting head, multiple negative pressure holes on the cutting platform, a support plate below the cutting platform, and multiple adsorption sleeves with increasing inner diameters between the support plate and the cutting platform. The top of each adsorption sleeve is open, and the bottom is connected to a base plate. The base plate has a through hole in the middle, and each adsorption sleeve passes through the through hole in the base plate of the adsorption sleeve above it. The top surface of the outermost adsorption sleeve is attached to and fixed to the bottom surface of the cutting platform. Elastic telescopic rods connect the remaining adsorption sleeves to the support plate, and each elastic telescopic rod applies an upward elastic force to the adsorption sleeve, ensuring that the top surface of the adsorption sleeve is tightly attached to the bottom surface of the cutting platform. This invention allows the adsorption area on the cutting platform to be adapted to different types of metal sheet raw materials to be cut, reliably adsorbing the metal sheet raw materials.

Description

Technical Field

[0001] This invention relates to the field of laser cutting technology, and in particular to a high-precision laser cutting stage. Background Technology

[0002] Optical instruments are widely used in consumer electronics, industrial inspection, medical diagnosis, security monitoring, and scientific research. Their imaging quality and optical performance directly affect the detection accuracy and performance of the instruments. With the continuous development of optical technology, various optical instruments have placed higher demands on the precision of optical path control, stray light suppression, and environmental adaptability. Therefore, optical metal components such as apertures, light shields, and precision metal masks are usually set in the optical path to achieve precise control of the light propagation path, thereby improving the imaging quality and measurement accuracy of the optical system.

[0003] High-precision optical metal sheets are typically made of materials such as stainless steel, nickel alloys, and copper alloys. They are characterized by their thinness, high dimensional accuracy requirements, stringent edge quality requirements, and high surface quality requirements, and are widely used in camera modules, industrial cameras, medical imaging equipment, laser measurement equipment, and other optical instruments. After the high-precision optical metal sheets are manufactured, they usually need to be processed into predetermined specifications according to the size and shape requirements of different products to meet subsequent assembly and usage requirements.

[0004] High-precision optical metal sheets typically have characteristics such as thinness, low rigidity, high dimensional accuracy requirements, and strict edge quality requirements. Therefore, laser cutting is commonly used for processing in existing technologies. To avoid surface scratches, indentations, or other surface quality issues caused by direct contact between the metal sheet and the cutting platform during the cutting process, the cutting structure for high-precision optical metal sheets usually has high precision requirements. In actual processing, there are also cases where equipment used for laser cutting of optical glass and metal sheets is used for cutting high-precision optical metal sheets.

[0005] Existing laser cutting equipment of this kind, such as the metal sheet laser cutting device disclosed in patent CN204470787U, includes a laser cutting head, a movable platform for placing metal sheets is provided below the laser cutting head, the laser cutting head is mounted on a frame that can move up and down, and a hydraulic cylinder is also provided on the frame. The piston rod of the hydraulic cylinder is connected to the laser cutting head through a lever, the middle of the lever is hinged, and the two ends of the lever are respectively hinged to the piston rod and the laser cutting head.

[0006] To prevent surface damage caused by the metal sheet's side facing away from the laser cutting head contacting the cutting platform during the cutting process, the metal sheet is typically attached to the substrate using UV adhesive. Numerous adsorption holes are then created on the cutting platform's surface, employing negative pressure adsorption to fix both the substrate and the metal sheet to the platform. However, the area of ​​the adsorption zone on the cutting platform is generally fixed, while the metal sheets to be cut come in various sizes, making it difficult to perfectly match the size of the adsorption zone. If the adsorption zone is smaller than the metal sheet, it cannot completely cover the substrate, resulting in uneven adsorption force and incomplete adhesion to the cutting platform surface, leading to weak fixation. Conversely, if the adsorption zone is larger than the metal sheet, a large amount of gas is drawn into areas not covered by the metal sheet, reducing the effective vacuum of the adsorption system. To achieve sufficient adsorption force, the vacuum pump power needs to be increased, leading to increased energy consumption. Furthermore, when the airflow enters the excess adsorption zone, it carries dust suspended in the air and on the platform surface. Some of this dust directly impacts and adheres to the metal sheet, causing surface damage. Summary of the Invention

[0007] This invention provides a high-precision laser cutting stage to solve the technical problem in existing laser cutting devices where the adsorption area of ​​the cutting platform is difficult to adapt to different types of metal sheets, resulting in unreliable fixation of the metal sheets and easy surface damage.

[0008] To solve the above problems, the present invention provides a high-precision laser cutting stage using the following technical solution:

[0009] A high-precision laser cutting stage includes a frame, a laser cutting head mounted on the frame, and a cutting platform located below the laser cutting head. The cutting platform has multiple negative pressure holes, and a support plate with fixed vertical positions is located below the cutting platform. Between the support plate and the cutting platform, there are multiple adsorption sleeves with increasing inner diameters. The top of the adsorption sleeve is open, and the bottom is connected to a base plate. The base plate has a perforation in the middle, and each adsorption sleeve passes through the perforation in the base plate of the adsorption sleeve above it. The top surface of the outermost adsorption sleeve is attached to and fixed to the bottom surface of the cutting platform. The remaining adsorption sleeves are connected to the support plate by elastic telescopic rods. Each elastic telescopic rod applies an upward elastic force to the adsorption sleeve, so that the top surface of the adsorption sleeve is tightly attached to the bottom surface of the cutting platform. Except for the outermost adsorption sleeve, all other adsorption sleeves have baffles connected to their outer walls. The baffles are located above the bottom plate of the next-level adsorption sleeve. An air suction pipe is installed through a perforation in the bottom plate of the innermost adsorption sleeve. The top of the air suction pipe has an air inlet, and the bottom of the air suction pipe is connected to a vacuum generator for evacuation. A lifting mechanism is connected to the support plate. The innermost adsorption sleeve is connected to the lifting output end of the lifting mechanism. The lifting mechanism is used to drive the innermost adsorption sleeve to move down, and through the stop block, it drives the remaining adsorption sleeves except the outermost adsorption sleeve to move down from the inside to the outside in succession.

[0010] Using the above technical solution, when the top of each adsorption sleeve is in contact with the bottom surface of the cutting platform, the suction pipe is only connected to the innermost adsorption sleeve's inner cavity. At this time, only the negative pressure holes inside the innermost adsorption sleeve on the cutting platform are connected to the suction pipe, thus having an adsorption effect. When the driving lifting mechanism moves the innermost adsorption sleeve downwards, the top of the innermost adsorption sleeve leaves the cutting platform. At this time, the inner cavity of the adsorption sleeve above this sleeve is connected to the suction pipe, increasing the number of negative pressure holes connected to the suction pipe on the cutting platform. During the downward movement of the lifting output end of the lifting mechanism, each adsorption sleeve drives the upper-level adsorption sleeve downwards through the outer stop. The movement allows each adsorption sleeve to separate from the cutting platform sequentially from the inside out, thereby gradually changing the number of negative pressure holes connected to the suction pipe. For different types of metal sheet raw materials, the height position of the innermost adsorption sleeve can be controlled by the lifting mechanism, opening different numbers of negative pressure holes. This ensures that the coverage area and shape of the multiple negative pressure holes with adsorption function are adapted to the area and shape of the metal sheet raw material, thus adsorbing the metal sheet raw material more firmly and stably onto the cutting platform. This avoids the need to increase the power of the vacuum generator and the situation where excess negative pressure holes suck external dust onto the surface of the metal sheet, causing surface damage.

[0011] Furthermore, the elastic telescopic rod includes a fixed rod and a movable rod. The fixed rod is connected to the support plate, and the movable rod is connected to the base plate corresponding to the adsorption sleeve. A locking structure is provided between the fixed rod and the movable rod to limit the movement of the movable rod. The bottom of the next-level adsorption sleeve of each adsorption sleeve connected to the support plate with the elastic telescopic rod is provided with an unlocking structure. When each adsorption sleeve moves down to the stop block above it and contacts the base plate in the previous-level adsorption sleeve, the locking structure on the elastic telescopic rod at the bottom of the previous-level adsorption sleeve is triggered by the unlocking structure and unlocked, so that the previous-level adsorption sleeve can be moved down by the stop block.

[0012] Using the above technical solution, the elastic telescopic rod is locked by the locking structure and is in a fixed state that cannot be retracted. It can only be unlocked by the unlocking structure and become retractable when the corresponding next-level adsorption sleeve moves down to the set position. This can avoid the situation where the adsorption sleeve that needs to move down moves down along with the previous-level adsorption sleeve due to the large friction between two adjacent adsorption sleeves, and ensure that each adsorption sleeve can move down sequentially from the inside to the outside.

[0013] Furthermore, the locking structure includes an L-shaped locking member and a locking groove. The turning point of the L-shaped locking member is hinged to the top of the fixed rod around a horizontally extending rotation axis, and a torsion spring is provided between it and the fixed rod. The opening of the L-shaped locking member faces away from the fixed rod. The top of the L-shaped locking member is connected to a limiting protrusion, and the bottom is a trigger end suspended outside the fixed rod. The locking groove is opened at the bottom of the movable rod. When the torsion spring is in a free state, the limiting protrusion is inserted into the locking groove.

[0014] Furthermore, the unlocking structure includes a trigger plate connected to the bottom of the adsorption sleeve. The trigger plate is vertically opposite to the trigger end in the free state. When the adsorption sleeve moves downward, the trigger plate pushes the trigger end to flip downward, causing the limiting protrusion to leave the locking groove, thereby unlocking.

[0015] Furthermore, the air inlet is located on the side wall of the suction pipe, and a baffle is connected inside the innermost adsorption sleeve. The baffle is fitted outside the suction pipe and covers part of the air inlet. As the baffle moves down with the innermost adsorption sleeve, the area of ​​the air inlet exposed gradually increases.

[0016] Using the above technical solution, the baffle is fitted on the outside of the suction pipe and connected to the innermost adsorption sleeve. It can move down synchronously with the innermost adsorption sleeve. As the innermost adsorption sleeve moves down, the internal space of the adsorption sleeve connected to the suction pipe gradually increases, and the area of ​​the exposed air inlet also increases. This can increase the air volume. For adsorption sleeves of various sizes, it can make their interiors vacuumed in a short time, so that the negative pressure reaction time will not be prolonged due to the increase in the size of the adsorption sleeve.

[0017] Furthermore, a breathable filter layer is provided above the cutting platform, and the breathable filter layer is attached to the top surface of the cutting platform.

[0018] By adopting the above technical solution, the air-permeable filter layer is placed above the cutting platform, which does not affect the passage of gas and can also prevent the smoke and dust generated during laser cutting from being sucked into the negative pressure hole and interfering with the vacuum generating device.

[0019] Furthermore, a movable frame is installed on the frame, and the cutting platform is connected to the movable frame. The breathable filter layer has a continuous annular structure. Four drive rollers arranged in a square are installed on the movable frame. The breathable filter layer is fitted over the four drive rollers, and the top horizontal section of the breathable filter layer rests against the cutting platform.

[0020] By adopting the above technical solution, the breathable filter layer is set as a ring structure and fitted outside four drive rollers. The four drive rollers can drive the breathable filter layer to rotate. When the top horizontal section of the breathable filter layer has absorbed a lot of dust after long-term use, the breathable filter layer can be rotated by driving the rollers to move the uncontaminated part of the ring-shaped breathable filter layer to the cutting platform for use. The replacement of the breathable filter layer is more convenient in the short term, which can improve production efficiency.

[0021] Furthermore, a tension roller is installed on the frame in an adjustable horizontal position, pressing the breathable filter layer from the outside in so that the breathable filter layer forms a concave area.

[0022] Using the above technical solution, the tensioning roller is pressed onto the breathable filter layer to tighten the breathable filter layer and ensure that there is enough friction to drive the breathable filter layer to rotate.

[0023] Furthermore, a dust removal fan is installed on the frame, the tension roller is hollow inside, and multiple adsorption holes communicating with the inner cavity of the tension roller are provided on the side wall. The inner cavity of the tension roller is connected to the dust removal fan, and a protective shell is provided on the side of the tension roller facing away from the breathable filter layer.

[0024] Using the above technical solution, the tension roller is connected to the vacuum generating device. When the air-permeable filter layer passes through the tension roller during rotation, the tension roller can adsorb the dust particles adhering to its surface to clean the surface of the air-permeable filter layer.

[0025] Furthermore, a pressure roller is provided above the tension roller, parallel to it. The pressure roller is elastically slidably mounted on the movable frame, and a push rod is connected to the end of the pressure roller. A mounting plate is connected to the end of the tension roller, and a push block is connected to the mounting plate. The push block has a push surface. When the tension roller rotates, the push block pushes the push rod downward through the push inclined surface, causing the pressure roller to move downward and store force. After the push block separates from the push rod, the pressure roller pops upward and strikes the breathable filter layer.

[0026] Using the above technical solution, the tension roller is driven to rotate by the rotating breathable filter layer. When the tension roller rotates, it drives the push block to rotate. The push block pushes the push rod downward through the push surface, causing the push rod to drive the pressure roller downward and store force. After the push block leaves the push rod, the pressure roller releases and impacts the breathable filter layer, beating the breathable filter layer and causing the dust particles to detach from the breathable filter layer and be more easily adsorbed by the tension roller.

[0027] The beneficial effects of the high-precision laser cutting stage provided by this invention are as follows: This invention can adjust the size of the adsorption area on the cutting platform, allowing the adsorption area to perfectly match different types of metal sheet raw materials to be cut. This ensures that the metal sheet raw material is more reliably and stably adsorbed above the cutting platform, and avoids the appearance of excess negative pressure holes with adsorption capacity on the outer side of the metal sheet raw material, preventing external suspended impurities from being adsorbed onto the surface of the metal sheet raw material and causing surface damage. This invention can also clean the breathable filter layer used to isolate dust particles, allowing it to be reused. Attached Figure Description

[0028] Figure 1 A three-dimensional structural diagram of a high-precision laser cutting stage provided by the present invention; Figure 2 A sectional view of a high-precision laser cutting stage from a side view perspective provided by the present invention; Figure 3 A sectional view from the side of the moving frame in a high-precision laser cutting stage provided by the present invention; Figure 4 A cross-sectional view from the front view of the moving frame in a high-precision laser cutting stage provided by the present invention; Figure 5 for Figure 4 Enlarged structural diagram at point A; Figure 6 This invention provides a schematic diagram of the structure of the tension roller in a high-precision laser cutting table. Figure 7 for Figure 6 Enlarged schematic diagram of the structure at point B.

[0029] Explanation of reference numerals in the attached figures: 1. Frame; 101. Slide rail; 102. Receiving groove; 103. Slide groove; 2. Laser cutting head; 3. Breathable filter layer; 4. Screw; 5. Guide rod; 6. Moving frame; 601. Frame surface; 602. Connecting rod; 7. Limiting plate; 8. Cutting platform; 9. Support plate; 10. Suction branch pipe; 11. Suction pipe; 111. Air inlet; 12. Baffle; 13. Adsorption sleeve; 14. Base plate; 15. Stop block; 16. Transmission roller; 17. Movable rod; 171. Locking groove; 8. Fixed rod; 19. Trigger plate; 20. Pressure roller; 21. L-shaped locking element; 211. Limiting protrusion; 212. Trigger end; 22. Tensioning roller; 23. Support plate; 231. Adjusting hole; 24. Transmission block; 25. Adjusting screw; 26. Fixed plate; 27. Clamping plate; 28. Mounting plate; 29. ​​Elastic telescopic rod II; 291. Moving section; 292. Fixed section; 30. Mating plate I; 31. Mating plate II; 32. Push block; 33. Push rod; 34. Locking nut. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below 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.

[0031] The following is one embodiment of a high-precision laser cutting stage provided by the present invention: like Figures 1-7 As shown, a high-precision laser cutting stage includes a frame 1, a cutting platform 8, and a laser cutting head 2.

[0032] like Figure 1 , Figure 2 As shown, the frame 1 is arranged on a horizontal ground. The frame 1 is provided with a sliding groove 103 extending forward and backward. At the bottom of the sliding groove 103, the frame 1 is provided with an upwardly protruding slide rail 101. The left and right sides of the slide rail 101 have two receiving grooves 102 extending forward and backward. A screw 4 extending forward and backward is inserted into one receiving groove 102. The screw 4 is rotatably mounted on the frame 1. A guide rod 5 extending forward and backward is inserted into the other receiving groove 102. The guide rod 5 is fixed on the frame 1.

[0033] A movable frame 6 is installed inside the aforementioned chute 103, such as... Figure 4 As shown, the movable frame 6 includes two frame surfaces 601 arranged opposite each other on the left and right, and multiple connecting rods 602 extending left and right are connected between the two frame surfaces 601. Figure 2 As shown, a limiting plate 7 is connected to the bottom of each of the two frame surfaces 601. The two limiting plates 7 are respectively engaged on the left and right sides of the slide rail 101, so that the slide rail 101 can guide the forward and backward sliding of the moving frame 6. A transmission block 24 is connected to the outer side of each of the two limiting plates 7. The two transmission blocks 24 are slidably inserted into the two receiving grooves 102. One transmission block 24 is spirally fitted onto the screw 4, and the other transmission block 24 is slidably fitted onto the guide rod 5.

[0034] A rotary drive mechanism is also installed on the frame 1. The rotary drive mechanism is connected to the screw 4 mentioned above and is used to drive the screw 4 to rotate forward and backward, thereby driving the moving frame 6 to move back and forth on the frame 1. The rotary drive mechanism uses a motor, which is existing technology and is not shown in the figure.

[0035] like Figure 4As shown, the movable frame 6 is hollow inside. At each of the four corners of the movable frame 6, there is a left-right extending transmission roller 16. The transmission roller 16 is rotatably connected between the two frame surfaces 601. A ring-shaped breathable filter layer 3 is fitted on the outside of the four transmission rollers 16. A rotary drive mechanism 2 is installed on the movable frame 6. The rotary drive mechanism 2 is connected to one of the transmission rollers 16 and is used to drive the transmission roller 16 to rotate, thereby driving the breathable filter layer 3 to rotate.

[0036] The aforementioned drive roller 16 is a rubber roller, and the breathable filter layer 3 can be made of high-strength PTFE membrane filter material, which is joined end to end to form a ring structure by ultrasonic welding. The breathable filter layer 3 can also be made of polyester, nylon nonwoven fabric or ultra-high molecular weight polyethylene woven fabric.

[0037] like Figure 3 , Figure 4 As shown, a support plate 9 is fixedly installed at the bottom of the inner cavity of the movable frame 6, and a cutting platform 8 is installed at the top of the movable frame 6. The cutting platform 8 is located below the top horizontal section of the breathable filter layer 3. Multiple circular ventilation holes are formed on the cutting platform 8, arranged in an array. The top surface of the cutting platform 8 is slightly higher than the drive roller 16 located above it, so that the top surface of the cutting platform 8 can maintain contact with the breathable filter layer 3. Both the front and rear ends of the cutting platform 8 are curved to avoid indentations on the breathable filter layer 3.

[0038] like Figure 3 , Figure 4 As shown, multiple adsorption sleeves 13 are provided below the cutting platform 8. The horizontal cross-section of the adsorption sleeves 13 is square, and the inner diameter of the multiple adsorption sleeves 13 increases sequentially, each matching the size of the existing uncut metal sheets of various models. Each adsorption sleeve 13 is open at the top and connected to a base plate 14 at the bottom. A square through hole is provided in the middle of the base plate 14. The outer circumference of each adsorption sleeve 13 is adapted to the inner diameter of the through hole on the base plate 14 of the adsorption sleeve 13 above it. Each adsorption sleeve 13 slides up and down through the through hole on the base plate 14 of the adsorption sleeve 13 above it.

[0039] An air suction pipe 11 is inserted through a perforation in the bottom plate 14 of the innermost adsorption sleeve 13. The top end of the air suction pipe 11 is closed, and the side wall has a strip-shaped air inlet 111 extending vertically. The bottom end of the air suction pipe 11 is connected to the support plate 9. An air suction branch pipe 10 is also connected to the support plate 9. A vacuum generator for vacuuming is installed on the frame 1. One end of the air suction branch pipe 10 is connected to the air suction pipe 11, and the other end is connected to the vacuum generator for vacuuming.

[0040] A baffle 12 is fitted on the outside of the suction pipe 11. The baffle 12 is fixedly connected to the base plate 14 on the innermost suction sleeve 13. When the top of the innermost suction sleeve 13 is against the bottom surface of the cutting platform 8, the air inlet 111 is blocked by the baffle 12, with only a part of the top area exposed. As the innermost suction sleeve 13 gradually moves down, the area exposed in the air inlet 111 gradually increases.

[0041] A lifting mechanism is also installed on the aforementioned support plate 9. The bottom plate 14 of the innermost adsorption sleeve 13 is connected to the lifting output end of the lifting mechanism. The lifting mechanism is used to drive the innermost adsorption sleeve 13 to move up and down. The lifting mechanism uses a lifting cylinder, which is existing technology. To clearly and concisely demonstrate the structure of the present invention and avoid obstruction, the lifting mechanism is not shown in the figure.

[0042] Each of the perforations on the aforementioned base plate 14 is connected to a rubber sealing gasket on its inner wall to achieve a seal between the base plate 14 and the corresponding adsorption sleeve 13, as well as a seal between the base plate 14 and the suction pipe 11.

[0043] like Figure 3 As shown, except for the outermost adsorption sleeve 13, each of the other adsorption sleeves 13 has a stop block 15 connected to its outer side wall. The stop block 15 is located above the bottom plate 14 of the adsorption sleeve 13 above the corresponding adsorption sleeve 13.

[0044] like Figure 4 As shown, except for the outermost and innermost adsorption sleeves 13, the bottom of each of the other adsorption sleeves 13 is connected to two elastic telescopic rods arranged symmetrically front to back. Each elastic telescopic rod includes a fixed rod 18 and a movable rod 17 that are inserted into each other in the vertical direction. The bottom end of the fixed rod 18 is fixedly connected to the support plate 9, and the top end of the movable rod 17 is fixedly connected to the bottom plate 14 in the corresponding adsorption sleeve 13.

[0045] like Figure 5 As shown, a locking structure connects the fixed rod 18 and the movable rod 17. The locking structure includes an L-shaped locking member 21 and a locking groove 171. The opening of the L-shaped locking member 21 faces away from the fixed rod 18. The turning point of the L-shaped locking member 21 is rotatably mounted on the top of the fixed rod 18 around a horizontal axis extending left and right, and a torsion spring is provided between it and the fixed rod 18. A limiting protrusion 211 is provided on the side of the top of the L-shaped locking member 21 facing the fixed rod 18. The bottom end of the L-shaped locking member 21 is a suspended trigger end 212. The locking groove 171 is opened on the outer wall of the bottom end of the movable rod 17. When the torsion spring is in the free state, the limiting protrusion 211 is inserted into the locking groove 171, and the elastic telescopic rod cannot retract at this time.

[0046] When each elastic telescopic rod is at its original length, the top of each adsorption sleeve 13 is tightly attached to the bottom surface of the cutting platform 8. In order to avoid gaps between the adsorption sleeve 13 and the cutting platform 8, a layer of rubber sealing gasket is attached to the top surface of each adsorption sleeve 13.

[0047] like Figure 4 As shown, except for the two outermost adsorption sleeves 13, the bottom plates 14 of the remaining adsorption sleeves 13 are all connected to unlocking structures. The unlocking structures include vertically extending trigger plates 19. The trigger plates 19 are connected to the bottom surface of the bottom plate 14. The trigger plates 19 are vertically opposite to the trigger end 212 of the L-shaped locking member 21 on the elastic telescopic rod at the bottom of the upper-level adsorption sleeve 13. As the adsorption sleeve 13 moves downward, the trigger plates 19 push the trigger end 212 to flip downward, thereby causing the limiting protrusion 211 to leave the locking groove 171, thus releasing the lock between the fixed rod 18 and the movable rod 17.

[0048] like Figure 4 As shown, support plates 23 are installed on the rear sides of both frame surfaces 601. The two support plates 23 are arranged symmetrically from left to right, and the support plates 23 have strip-shaped adjustment holes 231 extending from front to back. A tension roller 22 with its axis extending from left to right is provided between the two support plates 23. The tension roller 22 is hollow inside, and multiple adsorption holes communicating with its inner cavity are provided on its outer wall. The tension roller 22 is used to press the breathable filter layer 3 from the outside to the inside.

[0049] The tension roller 22 has a shaft section coaxially connected to each of its left and right ends. These two shaft sections pass through adjustment holes 231 on two support plates 23. A fixing plate 26 is provided on the outer side of each support plate 23. The fixing plate 26 is slidably mounted on the support plate 23 via a guide groove and guide block structure that engages in a plug-in fit. Both shaft sections extend to the outer side of the support plate 23 and rotatably pass through the fixing plate 26. A clamping plate 27 is vertically connected to the outer end of each shaft section, located outside the fixing plate 26. A connecting hole extending to the left and right is opened at the center of the integral structure formed by one of the shaft sections and the clamping plate 27. A connecting pipe passes through the connecting hole and is fixed to the movable frame 6. The connecting pipe rotatably engages with the integral structure formed by the shaft section and the clamping plate 27. A dust removal fan is also installed on the frame 1. The connecting pipe is connected to the air inlet of the dust removal fan via a connecting hose, allowing the dust on the breathable filter layer 3 to be sucked into the adsorption holes. The dust removal fan is existing technology and is not shown in the figure.

[0050] Each support plate 23 has a mating plate 30 vertically connected to the front end of its outer side wall, and each fixing plate 26 has a mating plate 31 vertically connected to the front end of its outer side wall. An adjusting screw 25 is threaded onto the mating plate 31. One end of the adjusting screw 25 is rotatably connected to the mating plate 30 and is fixed relative to it in the front-back direction. Rotating the adjusting screw 25 adjusts the front-back position of the mating plate 31, thereby adjusting the front-back position of the tension roller 22. A locking nut 34 is also threaded onto the adjusting screw 25. The locking nut 34 is located behind the mating plate 31. When the locking nut 34 is pressed against the mating plate 31, it locks the adjusting screw 25 in place, thus fixing the position of the tension roller 22.

[0051] like Figure 6 , Figure 7 As shown, each fixed plate 26 is connected to a second elastic telescopic rod 29 at its top. The second elastic telescopic rod 29 includes a fixed section 292 and a movable section 291 that are interlocked with each other. The fixed section 292 is fixedly connected to the fixed plate 26. A pressure roller 20 with its axis extending left and right is rotatably connected between the two movable sections 291 of the two elastic telescopic rods 29. The pressure roller 20 is located above the tension roller 22 and its outer diameter is smaller than that of the tension roller 22. A push rod 33 with a circular cross-section extending left and right is connected to the outside of each movable section 291.

[0052] Each card plate 27 is fixedly connected to a strip-shaped mounting plate 28 on its outer side. One end of the mounting plate 28 extends outside the card plate 27. A push block 32 is installed on the side of the mounting plate 28 facing the elastic telescopic rod 29. The cross-section of the push block 32 is arc-shaped, with an arc surface protruding towards the card plate 27. This arc surface is the push surface. When the elastic telescopic rod 29 is in a free state, the distance from the top of the pushing surface to the central axis of the tension roller 22 is greater than the distance from the support rod 33 to the central axis of the tension roller 22. During the rotation of the tension roller 22 driven by the breathable filter layer 3, the pushing block 32 is driven to rotate around the central axis of the tension roller 22. During this process, the pushing block 32 passes the support rod 33 successively and pushes the support rod 33 downward through the pushing surface. The support rod 33 drives the movable section 291 downward, causing the elastic telescopic rod 29 to compress and store force. After the pushing block 32 leaves the support rod 33 each time, the elastic telescopic rod 29 is released, and the movable section 291 drives the pressure roller 20 to pop up. The pressure roller 20 beats the breathable filter layer 3, which can effectively knock out the dust particles on the breathable filter layer 3 and make the dust particles adsorbed by the adsorption holes on the tension roller 22, thus better cleaning the breathable filter layer 3.

[0053] In order to improve the adsorption capacity of the adsorption holes in the pressure roller 20, a protective shell with an arc-shaped cross section is provided on the rear side of the pressure roller 20. The inner wall of the protective shell is attached to the outer wall of the pressure roller 20 or there is a small gap between the inner wall of the protective shell and the outer wall of the pressure roller 20. The protective shell is fixedly connected to the fixing plate 26 through a connector.

[0054] The laser cutting head 2 is slidably mounted on the frame 1 and positioned above the cutting platform 8. The laser cutting head 2 is existing technology, and its structure will not be described in detail here. The left-right movement of the laser cutting head 2 coordinates with the forward-backward movement of the moving frame 6 to perform laser cutting on the metal sheet above the cutting platform 8.

[0055] In use, the present invention first drives the rotary drive mechanism to move the moving frame 6 to the edge of the frame 1, and places the metal sheet to be cut on the breathable filter layer 3 above the cutting platform 8, so that the metal sheet is placed in the center. Then, the vacuum generator is started, and the lifting mechanism is controlled to remain unchanged or move up and down according to the size of the metal sheet, so that each adsorption sleeve 13 is moved to a state in which only the top of the adsorption sleeve 13 that matches the size of the metal sheet and is larger than the metal sheet is in contact with the bottom surface of the cutting platform 8, so that the size of the negative pressure adsorption area is adapted to the model of the metal sheet material to be cut, and each negative pressure hole with adsorption function is evenly distributed below the metal sheet material. The metal sheet material is firmly and stably fixed above the cutting platform 8. The negative pressure holes on the side of the metal sheet material do not have adsorption function, and external suspended impurities will not be adsorbed to the surface of the metal sheet by the excess negative pressure holes, thus causing surface damage to the metal sheet.

[0056] The rotary drive mechanism is driven again, moving the movable frame 6 below the laser cutting head 2. The laser cutting head 2 moves left and right to cut the metal sheet. During this process, the movable frame 6 is driven to feed in the back-and-forth direction, cooperating with the movement of the laser cutting head 2 to cut the metal sheet into smaller pieces. After cutting, the movable frame 6 is moved to the edge of the frame 1 again, the cut metal sheet is removed, a new metal sheet is placed in, and the above actions are repeated.

[0057] After the cutting process has been going on for a certain period of time, the surface of the breathable filter layer 3 may be adsorbed with a large amount of dust generated during the laser cutting process, which will affect the negative pressure adsorption effect of the cutting platform 8. At this time, it is only necessary to start the rotary drive mechanism 2 to drive the transmission roller 16 to rotate, drive the breathable filter layer 3 to rotate, and move the uncontaminated part of the breathable filter layer 3 to the top of the cutting platform 8. During the rotation of the breathable filter layer 3, the tension roller 22 is driven to rotate. When the tension roller 22 rotates, the mounting plate 28 and the push block 32 are also driven to rotate. The push block 32 contacts the push rod 33 through the push inclined surface and pushes the push rod 33 toward the central axis of the tension roller 22, causing the pressure roller 20 to move toward the central axis of the tension roller 22, thus storing energy in the pressure roller 20. After the push block 32 leaves the push rod 33, the pressure roller 20 releases and impacts the breathable filter layer 3, beating the breathable filter layer 3 and causing the dust particles adhering to the breathable filter layer 3 to fall off and be more easily adsorbed by the adsorption holes on the tension roller 22. Through the above process, the surface of the breathable filter layer 3 is cleaned. After cleaning, the breathable filter layer 3 can be moved back to the cutting platform 8 for use, allowing the breathable filter layer 3 to be reused for a long period of time without frequent replacement.

[0058] The rotary drive mechanism can also drive the transmission block 24 to the rear end of the screw 4, so that the moving frame 6 can be fully extended to the outside of the frame 1, so that the internal structure of the moving frame 6 can be repaired when necessary.

[0059] This invention allows the area of ​​the adsorption zone on the cutting platform 8 to perfectly match the size of different types of metal sheet raw materials to be cut, making the metal sheet raw materials more securely and stably fixed on the cutting platform 8. By setting a rotatable breathable filter layer 3 and automatically cleaning the breathable filter layer 3, the frequency of replacing the breathable filter layer 3 can be reduced.

[0060] In this embodiment, the breathable filter layer 3 is a continuous annular structure. By driving the breathable filter layer 3 to rotate, it can be continuously recycled. In other embodiments, the breathable filter layer 3 is a single-layer horizontally extending structure, laid flat above the cutting platform 8, and fixedly connected to the cutting platform 8 by an adhesive or clamping structure.

[0061] In this embodiment, an adjusting screw 25 is rotatably connected to the first mating plate 30. The adjusting screw 25 is spirally threaded through the second mating plate 31. By rotating the adjusting screw 25, the front and rear positions of the fixed plate 26 can be adjusted, thereby adjusting the front and rear positions of the tension roller 22. In other embodiments, one end of the adjusting screw 25 is rotatably mounted on the first mating plate 30, and the adjusting screw 25 is slidably threaded through the second mating plate 31. A locking nut 34 is threaded onto both the front and rear sides of the second mating plate 31. In this case, the front and rear positions of the tension roller 22 are adjusted by pushing the second mating plate 31. After the position is adjusted, the two locking nuts 34 are screwed onto the front and rear side walls of the second mating plate 31 to fix the position.

Claims

1. A high-precision laser cutting stage, comprising a frame, a laser cutting head mounted on the frame, and a cutting platform located below the laser cutting head, the cutting platform having multiple negative pressure holes, characterized in that... Below the cutting platform is a support plate with fixed upper and lower positions. Between the support plate and the cutting platform are multiple adsorption sleeves with increasing inner diameter. The top of the adsorption sleeve is open and the bottom is connected to a base plate. The base plate has a perforation in the middle. Each adsorption sleeve is inserted into the perforation in the base plate of the adsorption sleeve above it. The top surface of the outermost adsorption sleeve is attached to and fixed to the bottom surface of the cutting platform. The remaining adsorption sleeves are connected to the support plate by elastic telescopic rods. Each elastic telescopic rod applies an upward elastic force to the adsorption sleeve, so that the top surface of the adsorption sleeve is tightly attached to the bottom surface of the cutting platform. Except for the outermost adsorption sleeve, all other adsorption sleeves have baffles connected to their outer walls. The baffles are located above the bottom plate of the next-level adsorption sleeve. An air suction pipe is installed through a perforation in the bottom plate of the innermost adsorption sleeve. The top of the air suction pipe has an air inlet, and the bottom of the air suction pipe is connected to a vacuum generator for evacuation. A lifting mechanism is connected to the support plate. The innermost adsorption sleeve is connected to the lifting output end of the lifting mechanism. The lifting mechanism is used to drive the innermost adsorption sleeve to move down, and through the stop block, it drives the remaining adsorption sleeves except the outermost adsorption sleeve to move down from the inside to the outside in succession.

2. The high-precision laser cutting stage according to claim 1, characterized in that, The elastic telescopic rod includes a fixed rod and a movable rod. The fixed rod is connected to the support plate, and the movable rod is connected to the base plate corresponding to the adsorption sleeve. A locking structure is provided between the fixed rod and the movable rod to limit the movement of the movable rod. The bottom of the next-level adsorption sleeve of each adsorption sleeve connected to the support plate is provided with an unlocking structure. When each adsorption sleeve moves down to the stop block above it and contacts the base plate in the previous-level adsorption sleeve, the locking structure on the elastic telescopic rod at the bottom of the previous-level adsorption sleeve is triggered by the unlocking structure and unlocked, so that the previous-level adsorption sleeve can be moved down by the stop block.

3. A high-precision laser cutting stage according to claim 2, characterized in that, The locking structure includes an L-shaped locking element and a locking groove. The turning point of the L-shaped locking element is hinged to the top of the fixed rod around a horizontally extending rotation axis, and a torsion spring is provided between it and the fixed rod. The opening of the L-shaped locking element faces away from the fixed rod. The top of the L-shaped locking element is connected to a limit protrusion, and the bottom is a trigger end suspended outside the fixed rod. The locking groove is opened at the bottom of the movable rod. When the torsion spring is in the free state, the limit protrusion is inserted into the locking groove.

4. A high-precision laser cutting stage according to claim 3, characterized in that, The unlocking structure includes a trigger plate connected to the bottom of the adsorption sleeve. The trigger plate and the trigger end in the free state are vertically opposite each other. When the adsorption sleeve moves downward, the trigger plate pushes the trigger end to flip downward, causing the limiting protrusion to leave the locking groove, thereby unlocking.

5. A high-precision laser cutting stage according to any one of claims 1-4, characterized in that, The air inlet is located on the side wall of the suction pipe. The innermost adsorption sleeve is connected to a baffle. The baffle is fitted over the suction pipe and covers part of the air inlet. As the baffle moves down with the innermost adsorption sleeve, the exposed area of ​​the air inlet gradually increases.

6. A high-precision laser cutting stage according to any one of claims 1-4, characterized in that, A breathable filter layer is installed above the cutting platform, and the breathable filter layer is attached to the top surface of the cutting platform.

7. A high-precision laser cutting stage according to claim 6, characterized in that, A movable frame is installed on the machine frame, and the cutting platform is connected to the movable frame. The breathable filter layer has a continuous annular structure. Four drive rollers arranged in a square are installed on the movable frame. The breathable filter layer is fitted over the four drive rollers, and the top horizontal section of the breathable filter layer is attached to the top of the cutting platform.

8. A high-precision laser cutting stage according to claim 7, characterized in that, A tension roller is installed on the frame in an adjustable horizontal position. The tension roller presses on the breathable filter layer from the outside to the inside to form a concave area in the breathable filter layer.

9. A high-precision laser cutting stage according to claim 8, characterized in that, A dust removal fan is installed on the frame. The tension roller is hollow inside and has multiple adsorption holes on its side wall that communicate with the inner cavity of the tension roller. The inner cavity of the tension roller is connected to the dust removal fan. A protective shell is provided on the side of the tension roller that faces away from the breathable filter layer.

10. A high-precision laser cutting stage according to claim 9, characterized in that, Above the tension roller is a parallel pressure roller, which is elastically slidably mounted on the movable frame. The end of the pressure roller is connected to a push rod, and the end of the tension roller is connected to a mounting plate. A push block is connected to the mounting plate, and the push block has a push surface. When the tension roller rotates, the push block pushes the push rod downward through the push inclined surface, causing the pressure roller to move downward and store force. After the push block separates from the push rod, the pressure roller pops upward and slaps onto the breathable filter layer.

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