Heart stent laser cutting production device and method

Abstract

The invention discloses a heart stent laser cutting production device and method, and belongs to the technical field of laser cutting. A heart stent laser cutting production device comprises a supporting base, a feeding mechanism is arranged on the supporting base, a cutting mechanism is arranged on the supporting base, the feeding mechanism comprises a fixing structure for fixing raw materials and a conveying structure for conveying the raw materials, the conveying structure drives the fixing structure to slide on a base, and the cutting mechanism comprises a limiting structure for limiting a workpiece. The limiting structure is provided with a cutting structure for cutting a workpiece, the limiting structure is provided with a cooling structure for cooling raw materials in the cutting process, and the limiting structure and the fixing structure are coaxially arranged. By the adoption of the heart stent laser cutting production device and method, the problems that an existing laser cutting device is poor in heart stent metal tube raw material fixing effect and low in machining precision due to the fact that raw materials are affected by laser energy can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of laser cutting, and particularly relates to a laser cutting production device and production method for cardiac stents. Background Art

[0002] As an important medical device for treating coronary artery stenosis and obstruction, cardiac stents play a crucial role in cardiovascular interventional therapy. The processing of cardiac stents mainly adopts mechanical processing methods, such as stamping, milling, etc. Stamping processing is to stamp a metal sheet into the required stent shape through a mold. This method has a high production efficiency, but the manufacturing cost of the mold is high, and it is difficult to process complex stent structures. Milling processing is to use a milling cutter to cut a metal pipe to form the shape of the stent. Although milling processing can achieve a certain degree of precision control, the processing efficiency is low, and burrs and cutting heat are easily generated during the processing, requiring subsequent complex surface treatment and heat treatment processes, increasing the production cost and processing cycle. It can also be produced by the method of metal wire winding. Cold processing winding will cause work hardening of the metal wire, resulting in an increase in its hardness and a decrease in its toughness, affecting the long-term stability and safety of the cardiac stent in the human body. And it is difficult to produce high-precision cardiac stent structures by the method of metal wire winding, and the application limitations are relatively large.

[0003] As an advanced processing method, laser cutting technology has many advantages in the processing of cardiac stents. Laser has the characteristics of high energy density, high focusing property and good directivity, etc., and can achieve precise cutting of metal materials. Laser cutting has a fast speed and high production efficiency, which can greatly shorten the processing cycle. Laser cutting is a non-contact processing method, with little damage to the material, which can reduce the deformation and stress concentration of the stent and improve the mechanical properties of the stent. In addition, laser cutting can also achieve automated processing, improving the stability and consistency of production.

[0004] The existing patent CN202111650747.8 discloses a preparation device for a cardiac stent in the department of cardiology, including a rectangular bottom plate. One end of the upper side of the rectangular bottom plate is fixedly connected to the bottom end of an arc-shaped support plate, and the upper end of the arc-shaped support plate is fixedly connected to the lower side of a circular plate one. The above patent can put the raw material on a group of support rods, making the group of support rods inside the raw material. Turn the knob, the knob drives the worm to rotate, the worm meshes with the turbine to rotate, the turbine meshes with the driving gear to rotate, the driving gear meshes with the second gear ring to rotate, the second gear ring meshes with a group of second gears to rotate, each second gear drives the corresponding first connecting rod to swing, each first connecting rod drives the corresponding second connecting rod to swing, each second connecting rod drives the corresponding connecting rod to move, and each connecting rod drives the corresponding guide rod to move. Finally, a group of support rods support and fix the raw material, facilitating the subsequent cutting. The above patent fixes the raw material through a group of support rods. The inner diameter of the metal tube raw material used for processing the cardiac stent is relatively small, and the support of the raw material by the support rods affects the stability of the raw material support. Moreover, during the laser cutting process of the cardiac stent, due to the relatively high energy of the laser cutting head, the metal tube raw material is heated, and a heat-affected zone is easily formed in the metal tube. The heat-affected zone not only changes the properties of the raw material but also affects the stiffness of the raw material, causing micro-deformation of the metal tube during processing and affecting the processing effect of the cardiac stent. Summary of the Invention

[0005] The purpose of the present invention is to provide a laser cutting production device and production method for cardiac stents, which solves the problems of poor fixing effect of the metal tube raw material of the existing laser cutting device for cardiac stents and low processing accuracy caused by the influence of laser energy on the raw material.

[0006] To achieve the above purpose, the present invention provides a laser cutting production device for cardiac stents, including a support seat. A feeding mechanism for fixing and conveying the raw material is arranged on the support seat, and a cutting mechanism for laser cutting and processing the raw material is arranged on the support seat. The feeding mechanism includes a fixing structure for fixing the raw material and a conveying structure for conveying the raw material. The conveying structure drives the fixing structure to slide on the base. The cutting mechanism includes a limiting structure for limiting the workpiece, a cutting structure for cutting the workpiece is arranged on the limiting structure, a cooling structure for cooling the raw material during the cutting process is arranged on the limiting structure, and the limiting structure is coaxially arranged with the fixing structure.

[0007] Preferably, the fixing structure includes a movable seat. The conveying structure drives the movable seat to slide axially along the raw material on the base. A rotating seat is arranged on the movable seat, and the rotating seat is rotatably connected to the movable seat. A rotating component for driving the rotating seat to rotate is arranged on the movable seat. The rotating component includes a second motor fixed on the movable seat. A first gear is arranged on the output shaft of the second motor, and the first gear meshes with a toothed ring fixedly arranged at the end of the rotating seat. The second motor drives the rotating seat to rotate through the first gear and the toothed ring. A positioning component for positioning the raw material from the inside of the raw material is arranged at the center of one end of the rotating seat. A fixing component for fixing the raw material from the outside of the raw material is arranged on the rotating seat, and the fixing component and the positioning component are coaxially arranged.

[0008] Preferably, the positioning component includes a central column fixed on the rotating seat. A conical head facilitating the insertion of the central column into the raw material is arranged at the end of the central column far from the rotating seat. A plurality of mounting holes are uniformly arranged on the side wall of the central column. A positioning block is slidably arranged in the mounting hole. A second spring applying an outward thrust to the positioning block is arranged between the positioning block and the bottom of the mounting hole. An inclined surface facilitating the insertion of the positioning block into the raw material is arranged at the end of the positioning block extending out of the mounting hole.

[0009] Preferably, the fixing component includes a plurality of clamping blocks arranged in a circumferential array around the central column. The clamping blocks are slidably connected to the rotating seat. A chute passing through the central axis of the central column is arranged on the rotating seat, and the chute corresponds to the clamping blocks one by one. The clamping blocks are located in the chute and are slidably connected to the chute. A power component for driving the clamping blocks to slide synchronously inward or outward in the chute is arranged on the rotating seat.

[0010] Preferably, the power component includes a sliding plate located in a limiting groove arranged on the rotating seat. The limiting groove is sleeved outside the central column. An installation cavity is arranged inside the rotating seat. A sliding seat is slidably arranged in the installation cavity. The sliding plate is connected to the sliding seat through a connecting rod. A through hole enabling the connecting rod to pass through and guiding the connecting rod is arranged between the limiting groove and the installation cavity. A first spring applying an outward pulling force to the sliding seat is arranged between the sliding seat and the installation cavity. The sliding seat is hinged to the clamping block through a transmission plate, and an avoidance groove enabling the transmission plate to pass through is arranged in the chute. An electromagnet for fixing the sliding seat is arranged at the bottom of the installation groove. A permanent magnet is arranged on the side of the sliding seat close to the electromagnet. A wire passing hole enabling a wire to pass through is arranged on the rotating seat, and the wire is connected to the electromagnet.

[0011] Preferably, the conveying structure includes a lead screw rotatably connected to the base. A first motor for driving the lead screw to rotate is arranged on the base. A threaded hole enabling the lead screw to pass through and being adapted to the lead screw is arranged at the bottom of the movable seat. A guide rail for guiding the sliding of the movable seat is arranged on the base. A guide groove adapted to the guide rail is arranged on the movable seat. The guide rail is located in the guide groove and is slidably connected to the guide groove.

[0012] Preferably, the limiting structure includes a fixed seat fixed on the base. A central hole through which the raw material passes is provided on the fixed seat. The central hole is coaxially arranged with the central column. A number of limiting plates are arranged around the central hole in a circumferential array at the central hole. A roller in contact with the raw material is provided at one end of the limiting plate. A rotating plate is rotatably arranged on the fixed seat. The rotating plate is coaxially arranged with the central hole. An inclined arc-shaped transmission hole is provided on the rotating plate. A fixed pin is provided on the limiting plate. The fixed pin is located in the transmission hole and slides along the transmission hole. A limiting seat for guiding the sliding of the sliding plate is provided on the fixed seat. A guide block adapted to the limiting seat is provided on the sliding plate. A second gear is rotatably arranged on the fixed seat. The second gear meshes with a toothed ring provided on the rotating plate. A third motor for driving the second gear to rotate is provided on the fixed seat.

[0013] Preferably, the cutting structure includes a laser cutting head arranged on a mounting plate. A top plate and a bottom plate are provided on the fixed seat. A cylinder for driving the mounting plate to lift is provided on the top plate. A guide rod for guiding the lifting of the mounting plate is arranged between the top plate and the bottom plate. A through hole through which the guide rod passes is provided on the mounting plate. A conical limiting sleeve is provided on one side of the fixed seat close to the laser cutting head. A limiting hole through which the raw material passes is provided at the center of the limiting sleeve. The limiting hole is coaxially arranged with the central hole. The laser cutting head is located directly above the limiting hole.

[0014] Preferably, the cooling structure includes a fixing plate fixedly arranged in the central hole. A groove is provided on the fixing plate. A mounting seat is arranged in the groove. A spring for applying an outward thrust to the mounting seat is arranged between the mounting seat and the groove. A slider is slidably arranged inside the mounting seat. The slider moves inside the mounting seat along a direction parallel to the axis of the raw material. A rack is provided on the slider. The rack meshes with a transmission gear provided on the wheel shaft of the roller. A connecting pipe is provided on the slider. An air pipe communicated with the connecting pipe is arranged inside the slider. The air pipe is connected to an external air-cooling machine through the connecting pipe. A cooling pipe is rotatably arranged on the connecting pipe. The cooling pipe is hermetically locked and connected to the connecting pipe by a setscrew or thread. A number of air nozzles are provided on the cooling pipe. An avoidance hole through which the cooling pipe passes is provided on the limiting sleeve.

[0015] Based on the above-mentioned heart stent laser cutting production device, the heart stent production method includes the following steps: S1. Insert one end of the raw material outside the central column. One end of the raw material applies a thrust to the positioning block. The second spring is compressed. The second spring makes the positioning block contact the inner surface of the raw material to position the raw material. S2. Apply a thrust to the raw material. The end of the raw material pushes the sliding plate to slide inward along the limiting groove. The sliding plate drives the sliding seat to slide synchronously through the connecting rod. The first spring elongates. The sliding seat drives the clamping block to slide along the sliding groove through the transmission plate. The clamping block moves towards the raw material. The electromagnet is energized. The electromagnet adsorbs and fixes the sliding seat through the permanent magnet. The clamping block clamps and fixes the raw material. S3. The other end of the raw material passes through the central hole of the fixed seat. Start the third motor. The third motor drives the rotating plate to rotate through the second gear and the toothed ring. The rotating plate drives the limiting plate to slide along the limiting seat through the transmission hole and the fixing pin. The limiting plate drives the roller to move synchronously. The roller contacts the outer surface of the raw material to limit the raw material, and the transmission gear meshes with the rack. S4. Start the cylinder. The cylinder drives the laser cutting head to move downward through the mounting plate, adjust the distance between the laser cutting head and the raw material and adjust the power of the laser cutting head; rotate the cooling pipe, adjust the angle of the air nozzle, and lock the cooling pipe and the connecting pipe; start the air cooler. The air cooler sends cold air into the connecting pipe through the air pipe, and then sprays it out through the cooling pipe and the air nozzle, and adjust the wind speed and air volume of the cold air. S5. Start the laser cutting head and start the first motor. The first motor drives the lead screw to rotate. The lead screw drives the movable seat to slide on the base. The movable seat drives the raw material to slide through the clamping block. At the same time, start the second motor. The second motor drives the rotating seat to rotate through the first gear and the toothed ring, drives the workpiece to rotate and move, and the laser cutting head cuts the workpiece; when the workpiece slides, it drives the roller to rotate. The roller drives the transmission gear to rotate. The transmission gear drives the slider to slide along the mounting seat through the rack. The slider drives the connecting pipe and the cooling pipe to slide synchronously. The cooling pipe slides synchronously with the raw material to cool the raw material.

[0016] The advantages and positive effects of the laser cutting production device and production method for the heart stent of the present invention are as follows: 1. The present invention is provided with a positioning component at the center of one end of the rotating seat, and a fixing component is arranged on the rotating seat. The positioning component and the fixing component perform positioning from the inside and outside of the raw material respectively, which is beneficial to improving the accuracy of raw material positioning and the stability of fixation, and is beneficial to improving the processing accuracy of the raw material.

[0017] 2. The present invention is provided with a limiting structure on the fixed seat, and the raw material is supported at the front part through the limiting structure, improving the stability of the raw material.

[0018] 3. The invention is provided with a cooling structure on the fixed seat. The limiting structure drives the cooling structure to move synchronously, and the raw material is cooled through the cooling structure, reducing the influence of heat on the raw material during the laser cutting process, maintaining the performance and stiffness of the raw material, and improving the processing effect of the heart stent.

[0019] 4. In the present invention, the two cooling pipes of the cooling structure are respectively located on both sides of the bottom end of the laser cutting head, and the raw material is cooled from both sides of the raw material; the air nozzle is inclined outward along the axis of the raw material, so that the air nozzle blows air forward, and the heat is dissipated through the hollow structure processed at the front end of the raw material, improving the heat dissipation effect.

[0020] The technical solutions of the present invention will be further described in detail below through the drawings and embodiments. Brief Description of the Drawings

[0021] Figure 1 Schematic perspective structure of an embodiment of the present invention Figure 1 ; Figure 2 Schematic perspective structure of an embodiment of the present invention Figure 2 ; Figure 3 Schematic perspective structure of the back side of the feeding mechanism of an embodiment of the present invention; Figure 4 Schematic perspective structure of the front side of the feeding mechanism of an embodiment of the present invention; Figure 5 Schematic cross-sectional structure of the feeding mechanism of an embodiment of the present invention; Figure 6 is Figure 5 enlarged view of A in; Figure 7 Schematic structure of the rotating seat of an embodiment of the present invention; Figure 8 Schematic perspective structure of the back side of the cutting mechanism of an embodiment of the present invention; Figure 9 Schematic perspective structure of the front side of the cutting mechanism of an embodiment of the present invention; Figure 10 Schematic side view structure of the cutting mechanism of an embodiment of the present invention; Figure 11 Schematic structure of the limiting structure of an embodiment of the present invention; Figure 12 is Figure 11 enlarged view of B in; Figure 13 Schematic structure of the limiting sleeve of an embodiment of the present invention.

[0022] Reference Signs 1. Support base; 11. Base; 12. Guide rail; 13. First motor; 14. Lead screw; 2. Feeding mechanism; 21. Movable seat; 22. Rotating seat; 23. Second motor; 24. First gear; 25. Tooth ring; 26. Guide groove; 27. Central column; 28. Positioning block; 29. Slide plate; 210. Clamping block; 211. Installation cavity; 212. Limiting groove; 213. Slide seat; 214. Connecting rod; 215. First spring; 216. Transmission plate; 217. Avoidance groove; 218. Electromagnet; 219. Second spring; 220. Chute; 221. Installation hole; 222. Wire passing hole; 3. Cutting mechanism; 31. Fixed seat; 32. Central hole; 33. Rotating plate; 34. Second gear; 35. Third motor; 36. Transmission hole; 37. Limiting plate; 38. Roller; 39. Limiting seat; 310. Guide block; 311. Limiting sleeve; 312. Limiting hole; 313. Transmission gear; 314. Fixed plate; 315. Mounting seat; 316. Slide block; 317. Vent pipe; 318. Connecting pipe; 319. Cooling pipe; 320. Air nozzle; 321. Avoidance hole; 322. Laser cutting head; 323. Mounting plate; 324. Cylinder; 325. Top plate; 326. Bottom plate; 327. Guide rod. Detailed implementation manners

[0023] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In this application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. In case of inconsistency, the meaning described in this specification or the meaning obtained according to the content recorded in this specification shall prevail. In addition, the terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0025] The following will describe the embodiments of the present invention in detail with reference to the drawings.

[0026] As Figure 1 、 Figure 2As shown in the figure. A laser cutting production device for a heart stent includes a support base 1, and the support base 1 is fixed on the ground. A feeding mechanism 2 for fixing and conveying raw materials is arranged on the support base 1; a cutting mechanism 3 is arranged on the support base 1, and the cutting mechanism 3 is used for laser cutting and processing of raw materials. The feeding mechanism 2 includes a fixing structure for fixing raw materials and a conveying structure for conveying raw materials, and the conveying structure drives the fixing structure to slide on the base 11. The cutting mechanism 3 includes a limiting structure for limiting the workpiece, a cutting structure for cutting the workpiece is arranged on the limiting structure, and a cooling structure for cooling the raw materials during the cutting process is arranged on the limiting structure. The limiting structure and the fixing structure are coaxially arranged.

[0027] As Figure 3 , Figure 4 shown in the figure. The fixing structure includes a movable seat 21, and the conveying structure drives the movable seat 21 to slide along the axial direction of the raw material on the base 11. A rotating seat 22 is arranged on the movable seat 21, and the rotating seat 22 is rotatably connected to the movable seat 21 through a bearing. A rotating assembly for driving the rotating seat 22 to rotate is arranged on the movable seat 21. The rotating assembly includes a second motor 23, and the second motor 23 is fixed on the movable seat 21. A first gear 24 is fixedly arranged on the output shaft of the second motor 23, and the first gear 24 meshes with a toothed ring 25 fixedly arranged at the end of the rotating seat 22. The second motor 23 drives the rotating seat 22 to rotate through the first gear 24 and the toothed ring 25. A positioning assembly for positioning the raw material from the inside of the raw material is arranged at the center of one end of the rotating seat 22, and a fixing assembly for fixing the raw material from the outside of the raw material is arranged on the rotating seat 22, and the fixing assembly and the positioning assembly are coaxially arranged. The positioning assembly and the fixing assembly perform positioning from the inside and outside of the raw material respectively, which is beneficial to improving the accuracy of raw material positioning and the stability of fixing, and is beneficial to improving the processing accuracy of raw materials.

[0028] As Figure 5 , Figure 6 , Figure 7 shown in the figure. The positioning assembly includes a central column 27, and the central column 27 is fixed on the rotating seat 22. A conical head for facilitating the insertion of the central column 27 into the inside of the raw material is arranged at one end of the central column 27 away from the rotating seat 22. A plurality of mounting holes 221 are uniformly arranged on the side wall of the central column 27, a positioning block 28 is slidably arranged in the mounting hole 221, and the size of the mounting hole 221 is slightly larger than the size of the positioning block 28, so that the positioning block 28 just inserts into the mounting hole 221. A second spring 219 for applying an outward thrust to the positioning block 28 is arranged between the positioning block 28 and the bottom of the mounting hole 221, and the raw material is tightly positioned by the positioning block 28. An inclined surface for facilitating the insertion of the positioning block 28 into the inside of the raw material is arranged at one end of the positioning block 28 extending out of the mounting hole 221.

[0029] The fixing component includes a plurality of clamping blocks 210 that are circumferentially arrayed around the central column 27. The clamping blocks 210 are slidably connected to the rotating base 22. A chute 220 passing through the central axis of the central column 27 is provided on the rotating base 22, and the chute 220 is provided corresponding to the clamping blocks 210 one by one. The clamping blocks 210 are located in the chute 220 and are slidably connected to the chute 220.

[0030] A power component for driving the clamping blocks 210 to slide synchronously inward or outward in the chute 220 is provided on the rotating base 22. The power component includes a sliding plate 29. The sliding plate 29 is located in a limiting groove 212 provided on the rotating base 22, and the sliding plate 29 is slidably connected to the limiting groove 212. The limiting groove 212 is sleeved outside the central column 27. The inner diameter of the sliding plate 29 is smaller than the outer diameter of the raw material, and the outer diameter of the sliding plate 29 is larger than the outer diameter of the raw material, so that the raw material just abuts against the sliding plate 29. An installation cavity 211 is provided inside the rotating base 22, and a sliding seat 213 is slidably arranged in the installation cavity 211. The sliding plate 29 and the sliding seat 213 are fixedly connected by a connecting rod 214. A through hole for the connecting rod 214 to pass through and guiding the connecting rod 214 is provided between the limiting groove 212 and the installation cavity 211. A first spring 215 for applying an outward pulling force to the sliding seat 213 is provided between the sliding seat 213 and the installation cavity 211. The sliding seat 213 is hinged to the clamping block 210 through a transmission plate 216, and an avoidance groove 217 for the transmission plate 216 to pass through is provided in the chute 220. An electromagnet 218 for fixing the sliding seat 213 is fixedly provided at the bottom of the installation groove, and a permanent magnet is provided on one side of the sliding seat 213 close to the electromagnet 218. A wire passing hole 222 for the wire to pass through is provided on the rotating base 22, and the wire is connected to the electromagnet 218. After the electromagnet 218 is energized, it adsorbs and fixes the permanent magnet, realizing the fixation of the sliding seat 213, so that the clamping blocks 210 clamp the raw material. After the electromagnet 218 is powered off or a reverse current is applied, the permanent magnet is separated from the electromagnet 218 under the action of the first spring 215, and the clamping blocks 210 slide outward, facilitating the installation and disassembly of the raw material.

[0031] The conveying structure includes a lead screw 14. The lead screw 14 is rotatably connected to the base 11 through a bearing. A first motor 13 for driving the lead screw 14 to rotate is provided on the base 11. A threaded hole for the lead screw 14 to pass through and adapted to the lead screw 14 is provided at the bottom of the movable seat 21. A guide rail 12 for guiding the sliding of the movable seat 21 is provided on the base 11. A guide groove 26 adapted to the guide rail 12 is provided on the movable seat 21. The guide rail 12 is located in the guide groove 26 and is slidably connected to the guide groove 26.

[0032] As Figure 8 、 Figure 9 、 Figure 10 、 Figure 11As shown in the figure. The limiting structure includes a fixed seat 31, and the fixed seat 31 is fixed on the base 11. A central hole 32 through which the raw material passes is provided on the fixed seat 31, and the central hole 32 is coaxially arranged with the central column 27. A number of limiting plates 37 are arranged around the central hole 32 in a circumferential array at the central hole 32. One end of the limiting plate 37 is provided with a roller 38 in contact with the raw material, and the axle of the roller 38 is rotatably connected to the limiting plate 37 through a bearing. A rotating plate 33 is rotatably arranged on the fixed seat 31 through a bearing, and the rotating plate 33 is coaxially arranged with the central hole 32. An inclined arc-shaped transmission hole 36 is provided on the rotating plate 33, and the transmission holes 36 correspond to the limiting plates 37 one by one. A fixing pin is fixedly arranged on the limiting plate 37, and the fixing pin is located in the transmission hole 36 and slides along the transmission hole 36. A limiting seat 39 for guiding the sliding of the sliding plate 29 is fixedly arranged on the fixed seat 31, and a guiding block 310 adapted to the limiting seat 39 is provided on the sliding plate 29. A second gear 34 is rotatably arranged on the fixed seat 31 through a bearing, and the second gear 34 meshes with a toothed ring arranged on the rotating plate 33. A third motor 35 for driving the second gear 34 to rotate is fixedly arranged on the fixed seat 31. The third motor 35 drives the rotating plate 33 to rotate through the second gear 34 and the toothed ring. A limiting structure is arranged on the fixed seat 31 to support the front part of the raw material through the limiting structure, improving the stability of the raw material.

[0033] The cutting structure includes a laser cutting head 322, and the laser cutting head 322 is fixedly arranged on a mounting plate 323. A top plate 325 and a bottom plate 326 are fixedly arranged on the fixed seat 31, and a cylinder 324 for driving the mounting plate 323 to lift is arranged on the top plate 325. A guide rod 327 for guiding the lifting of the mounting plate 323 is fixedly arranged between the top plate 325 and the bottom plate 326, and a through hole through which the guide rod 327 passes is provided on the mounting plate 323. A conical limiting sleeve 311 is fixedly arranged on one side of the fixed seat 31 close to the laser cutting head 322. A limiting hole 312 through which the raw material passes is arranged at the center of the limiting sleeve 311, and the limiting hole 312 is coaxially arranged with the central hole 32. The laser cutting head 322 is located directly above the limiting hole 312.

[0034] As Figure 12 , Figure 13As shown in the figure. The cooling structure includes a fixing plate 314, which is fixedly arranged in the central hole 32. A groove is provided on the fixing plate 314, and a mounting seat 315 is arranged in the groove. A spring for applying an outward thrust to the mounting seat 315 is arranged between the mounting seat 315 and the groove. A slider 316 is slidably arranged inside the mounting seat 315, and the slider 316 moves in the mounting seat 315 along a direction parallel to the axis of the raw material. A rack is arranged on the slider 316, and the rack meshes with a transmission gear 313 fixedly arranged on the axle of the roller 38. The size of the transmission gear 313 is set according to requirements. A connecting pipe 318 is arranged on the slider 316, and an air pipe 317 communicating with the connecting pipe 318 is arranged inside the slider 316. The air pipe 317 is connected to an external air-cooling machine through the connecting pipe 318. The air-cooling machine is selected from existing models according to requirements. A cooling pipe 319 is rotatably arranged on the connecting pipe 318, and the cooling pipe 319 is hermetically and tightly connected to the connecting pipe 318 by a setscrew or thread, which is convenient for adjusting the angle of the cooling pipe 319. The two cooling pipes 319 are respectively located on both sides of the bottom end of the laser cutting head 322, and the raw material is cooled from both sides of the raw material; the air nozzle 320 is inclined outward along the axis of the raw material, so that the air nozzle 320 blows forward, and the heat is dissipated through the processed hollow structure at the front end of the raw material, improving the heat dissipation effect.

[0035] A plurality of air nozzles 320 are arranged on the cooling pipe 319. An avoidance hole 321 for the cooling pipe 319 to pass through is arranged on the limit sleeve 311.

[0036] Based on the above-mentioned heart stent laser cutting production device, a heart stent production method includes the following steps: S1. Insert one end of the raw material outside the central column 27. One end of the raw material applies a thrust to the positioning block 28, and the second spring 219 is compressed. The second spring 219 contacts the inner surface of the raw material with the positioning block 28 to position the raw material.

[0037] S2. Apply a thrust to the raw material. The end of the raw material pushes the slide plate 29 to slide inward along the limit groove 212. The slide plate 29 drives the slide seat 213 to slide synchronously through the connecting rod 214. The first spring 215 elongates. The slide seat 213 drives the clamping block 210 to slide along the chute 220 through the transmission plate 216. The clamping block 210 moves towards the raw material. The electromagnet 218 is energized, and the electromagnet 218 adsorbs and fixes the slide seat 213 through the permanent magnet, and the clamping block 210 clamps and fixes the raw material.

[0038] S3. The other end of the raw material passes through the central hole 32 of the fixing seat 31. Start the third motor 35. The third motor 35 drives the rotating plate 33 to rotate through the second gear 34 and the toothed ring. The rotating plate 33 drives the limiting plate 37 to slide along the limiting seat 39 through the transmission hole 36 and the fixing pin. The limiting plate 37 drives the roller 38 to move synchronously. The roller 38 contacts the outer surface of the raw material to limit the raw material; the transmission gear 313 meshes exactly with the rack, and under the action of the spring, the transmission gear 313 is in close contact with the rack.

[0039] S4. Start the cylinder 324. The cylinder 324 drives the laser cutting head 322 to move downward through the mounting plate 323, adjust the distance between the laser cutting head 322 and the raw material, and adjust the power of the laser cutting head 322. Rotate the cooling pipe 319, adjust the angle of the air nozzle 320, and lock the cooling pipe 319 with the connecting pipe 318. Start the air-cooling machine. The air-cooling machine sends cold air into the connecting pipe 318 through the air pipe 317, and then sprays it out through the cooling pipe 319 and the air nozzle 320, and adjust the wind speed and air volume of the cold air.

[0040] S5. Start the laser cutting head 322 and start the first motor 13. The first motor 13 drives the lead screw 14 to rotate. The lead screw 14 drives the movable seat 21 to slide on the base 11. The movable seat 21 drives the raw material to slide through the clamp 210. At the same time, start the second motor 23. The second motor 23 drives the rotating seat 22 to rotate through the first gear 24 and the toothed ring 25, driving the workpiece to rotate and move. The laser cutting head 322 cuts the workpiece. When the workpiece slides, it drives the roller 38 to rotate. The roller 38 drives the transmission gear 313 to rotate. The transmission gear 313 drives the slider 316 to slide along the mounting seat 315 through the rack. The slider 316 drives the connecting pipe 318 and the cooling pipe 319 to slide synchronously. The cooling pipe 319 slides synchronously with the raw material to cool the raw material.

[0041] After the processing is completed, the third motor 35 rotates in reverse, and the roller 38 moves away from the raw material. Rotate the first motor 13 in the reverse direction, and the raw material slides out of the fixing seat 31. The electromagnet 218 is powered off or a reverse current is applied, and the sliding seat 213 resets under the action of the first spring 215, and the remaining raw material is removed from the central column 27.

[0042] Therefore, by using the laser cutting production device and production method for heart stents of the present invention, it is possible to solve the problems that the existing laser cutting device has a poor fixing effect on the raw material of the heart stent metal tube, and the processing accuracy is low due to the influence of laser energy on the raw material.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A cardiac stent laser cutting production device, characterized in that: It includes a support seat, on which is provided a feeding mechanism for fixing and conveying raw materials, and on which is provided a cutting mechanism for laser cutting the raw materials; the feeding mechanism includes a fixing structure for fixing the raw materials and a conveying structure for conveying the raw materials, and the conveying structure drives the fixing structure to slide on the base, and the cutting mechanism includes a limiting structure for limiting the workpiece, and the limiting structure is provided with a cutting structure for cutting the workpiece, and the limiting structure is provided with a cooling structure for cooling the raw materials during the cutting process, and the limiting structure is coaxially arranged with the fixed structure.

2. A cardiac stent laser cutting production device according to claim 1, characterized in that: The fixed structure includes a movable seat, and the conveying structure drives the movable seat to slide along the axial direction of the raw material on the base. The movable seat is provided with a rotating seat, and the rotating seat is rotatably connected to the movable seat. The movable seat is provided with a rotating component that drives the rotating seat to rotate. The rotating component includes a second motor, and the second motor is fixed on the movable seat. A first gear is provided on the output shaft of the second motor, and the first gear is meshed with a gear ring fixedly provided at the end of the rotating seat. The second motor drives the rotating seat to rotate through the first gear and the gear ring; a positioning component for positioning the raw material from the inside of the raw material is provided at the center of one end of the rotating seat, and a fixed component for fixing the raw material from the outside of the raw material is provided on the rotating seat, and the fixed component and the positioning component are coaxially arranged.

3. A cardiac stent laser cutting production device according to claim 2, characterized in that: The positioning assembly includes a center column, which is fixed on a rotating seat. A cone head is arranged at one end of the center column away from the rotating seat to facilitate the insertion of the center column into the raw material. A plurality of mounting holes are evenly arranged on the side wall of the center column. A positioning block is slidably arranged in the mounting hole. A second spring is arranged between the positioning block and the bottom of the mounting hole to apply an outward thrust to the positioning block. An inclined surface is arranged at one end of the positioning block extending out of the mounting hole to facilitate the insertion of the positioning block into the raw material.

4. A cardiac stent laser cutting production device according to claim 3, characterized in that: The fixing assembly includes a plurality of clamping blocks distributed in a circular array around the central column, the clamping blocks are slidably connected to the rotating seat, a sliding groove passing through the central axis of the central column is provided on the rotating seat, the sliding groove and the clamping blocks are arranged in a one-to-one correspondence, the clamping blocks are located in the sliding groove and are slidably connected to the sliding groove, and a power assembly is provided on the rotating seat to drive the clamping blocks to slide synchronously inward or outward in the sliding groove.

5. A cardiac stent laser cutting production device according to claim 4, characterized in that: The power assembly includes a slide plate, which is located in a limiting groove provided on the rotating seat, and the limiting groove is sleeved on the outside of the central column. An installation cavity is provided inside the rotating seat, and a slide seat is slidably provided in the installation cavity. The slide plate and the slide seat are connected by a connecting rod, and a through hole is provided between the limiting groove and the installation cavity for the connecting rod to pass through and has a guiding effect on the connecting rod. A first spring that applies an outward pulling force to the slide seat is provided between the slide seat and the installation cavity, and the slide seat is hinged with the clamping block through a transmission plate, and an avoidance groove for the transmission plate to pass through is provided in the slide groove; an electromagnet for fixing the slide seat is provided at the bottom of the installation groove, and a permanent magnet is provided on the side of the slide seat close to the electromagnet, and a wire hole for the wire to pass through is provided on the rotating seat, and the wire is connected to the electromagnet.

6. A cardiac stent laser cutting production device according to claim 5, characterized in that: The conveying structure includes a screw rod, which is rotatably connected to the base. The base is provided with a first motor that drives the screw rod to rotate. The bottom of the movable seat is provided with a threaded hole for the screw rod to pass through and is adapted to the screw rod. The base is provided with a guide rail that guides the sliding of the movable seat. The movable seat is provided with a guide groove that is adapted to the guide rail. The guide rail is located in the guide groove and is slidably connected to the guide groove.

7. A cardiac stent laser cutting production device according to claim 6, characterized in that: The limiting structure includes a fixed seat, which is fixed on the base, and is provided with a center hole for the raw material to pass through. The center hole is coaxially arranged with the center column, and a plurality of limiting plates distributed in a circular array around the center hole are arranged at the center hole, and a roller in contact with the raw material is arranged at one end of the limiting plate; a rotating plate is rotatably arranged on the fixed seat, and the rotating plate is coaxially arranged with the center hole, and an inclined arc-shaped transmission hole is arranged on the rotating plate, and a fixing pin is arranged on the limiting plate, and the fixing pin is located in the transmission hole and slides along the transmission hole, and a limiting seat with a guiding effect on the sliding of the slide plate is arranged on the fixed seat, and a guide block matched with the limiting seat is arranged on the slide plate, and a second gear is rotatably arranged on the fixed seat, and the second gear is meshed with a gear ring arranged on the rotating plate, and a third motor for driving the second gear to rotate is arranged on the fixed seat.

8. A cardiac stent laser cutting production device according to claim 7, characterized in that: The cutting structure includes a laser cutting head, which is arranged on a mounting plate. A top plate and a bottom plate are arranged on a fixed seat. A cylinder for driving the mounting plate to rise and fall is arranged on the top plate. A guide rod for guiding the rising and falling of the mounting plate is arranged between the top plate and the bottom plate. A through hole for the guide rod to pass through is arranged on the mounting plate. A conical limiting sleeve is arranged on one side of the fixed seat close to the laser cutting head. A limiting hole for the raw material to pass through is arranged in the center of the limiting sleeve. The limiting hole is coaxial with the center hole, and the laser cutting head is located directly above the limiting hole.

9. A cardiac stent laser cutting production device according to claim 8, characterized in that: The cooling structure includes a fixing plate, which is fixedly arranged in the center hole, a groove is arranged on the fixing plate, a mounting seat is arranged in the groove, a spring is arranged between the mounting seat and the groove to apply outward thrust to the mounting seat, a slider is slidably arranged inside the mounting seat, the slider moves in the mounting seat along a direction parallel to the axis of the raw material, a rack is arranged on the slider, the rack is meshed with a transmission gear arranged on the wheel axle of the roller, a connecting pipe is arranged on the slider, a ventilation pipe connected to the connecting pipe is arranged inside the slider, the ventilation pipe is connected to an external air cooler through the connecting pipe, a cooling pipe is rotatably arranged on the connecting pipe, the cooling pipe is sealed and locked with the connecting pipe through a top screw or a thread, a plurality of air nozzles are arranged on the cooling pipe, and an avoidance hole for the cooling pipe to pass through is arranged on the limiting sleeve.

10. A heart stent production method based on a heart stent laser cutting production device according to claim 9, characterized in that: The following steps are involved: S1. Insert one end of the raw material into the outside of the central column. One end of the raw material applies thrust to the positioning block. The second spring is compressed. The second spring makes the positioning block contact with the inner surface of the raw material to position the raw material. S2. Apply thrust to the raw material, the end of the raw material pushes the slide plate to slide inward along the limit groove, the slide plate drives the slide seat to slide synchronously through the connecting rod, the first spring is extended, the slide seat drives the clamp block to slide along the slide groove through the transmission plate, the clamp block moves toward the raw material, the electromagnet is energized, the electromagnet fixes the slide seat through the permanent magnet, and the clamp block clamps the raw material; S3, the other end of the raw material passes through the center hole of the fixed seat, and the third motor is started. The third motor drives the rotating plate to rotate through the second gear and the gear ring. The rotating plate drives the limit plate to slide along the limit seat through the transmission hole and the fixed pin. The limit plate drives the roller to move synchronously. The roller contacts the outer surface of the raw material to limit the raw material, and the transmission gear is meshed with the rack. S4. Start the cylinder, which drives the laser cutting head downward through the mounting plate, adjusts the distance between the laser cutting head and the raw material, and adjusts the power of the laser cutting head; rotates the cooling pipe, adjusts the angle of the air nozzle, and locks the cooling pipe and the connecting pipe; starts the air cooler, which sends cold air into the connecting pipe through the ventilation pipe, and then sprays it out through the cooling pipe and the air nozzle, and adjusts the wind speed and air volume of the cold air; S5. Start the laser cutting head and the first motor. The first motor drives the lead screw to rotate, and the lead screw drives the movable seat to slide on the base. The movable seat drives the raw material to slide through the clamp. At the same time, the second motor is started. The second motor drives the rotating seat to rotate through the first gear and the gear ring, drives the workpiece to rotate and move, and the laser cutting head cuts the workpiece. When the workpiece slides, it drives the roller to rotate, and the roller drives the transmission gear to rotate. The transmission gear drives the slider to slide along the mounting seat through the rack, and the slider drives the connecting pipe and the cooling pipe to slide synchronously. The cooling pipe and the raw material slide synchronously to cool the raw material.

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