Laser cutting device for medical instrument production

Abstract

The invention relates to the field of laser cutting devices, in particular to a laser cutting device for medical instrument production, which comprises a laser cutting head and a sliding table, and further comprises a clamping mechanism arranged on the sliding table of the laser cutting device, the clamping mechanism comprises a stranding cage, the stranding cage comprises a short pipe, a pressure plate and a steel wire connected between the short pipe and the pressure plate, the steel wires are spiral, the spiral diameter of the two ends of each steel wire is larger than that of the middle of each steel wire, and the steel wires are arranged in an annular array relative to the short pipe. The two ends of the stranding cage are connected with the driving device and the brake device respectively, a workpiece inserted into the stranding cage is clamped by utilizing the characteristic that the two ends of the stranding cage rotate oppositely and reversely to gather the middle of a spiral steel wire, a main moving part in the clamping mechanism is the stranding cage composed of the short pipe, the pressing disc and the steel wire, and compared with a conventional steel chuck, the clamping mechanism is simple in structure and convenient to operate. The laser cutting device has the advantage of extremely remarkable light weight, is extremely low in movement inertia and flexible and rapid in action, and can effectively improve the laser cutting efficiency of the medical capillary metal tube.

Description

Technical Field

[0001] The invention relates to the field of laser cutting devices, in particular to a laser cutting device used for the production of medical devices. Background Art

[0002] The processing of the capillary metal tube wall structure for medical use is mainly completed by laser cutting equipment. During the processing, the capillary metal tube needs to rotate and move back and forth so that the laser can cut a specific shape on the tube wall. The clamping method used by the existing medical laser cutting device to clamp the capillary metal tube is the same as the type of chuck used in milling processing. Its clamping characteristics are strong clamping force and strong structural rigidity, but the clamping structure has a heavy weight. Taking a small pneumatic chuck as an example, the weight of a single chuck can generally reach more than five kilograms. For the laser cutting processing of capillary metal tubes, since laser cutting is achieved by heating and vaporizing metal, the clamping structure will not be subjected to high loads like milling processing, and the capillary tube has a very light weight and the tube wall is thin and easy to deform. Therefore, the clamping structure does not need to have a strong clamping force and high structural rigidity. Conventional chucks, especially pneumatic and hydraulic chucks used in CNC automation, are used in the medical capillary laser cutting processing. Not only does it have the obvious problem of poor start-stop flexibility, but also there is a problem of high equipment use and maintenance costs. Therefore, in order to optimize the above problems, a laser cutting device for medical device production is proposed, and its clamping structure has the advantages of being lighter, smaller inertia, more flexible, simpler in structure, lower cost and easier to maintain. Summary of the invention

[0003] In view of the above or existing problems of the chuck for laser cutting of Chinese medical capillary metal tubes having a large weight, low flexibility of movement and high cost of automated chucks, the present invention is proposed.

[0004] Therefore, an object of the present invention is to provide a laser cutting device for the production of medical devices.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: A laser cutting device for the production of medical devices, comprising a laser cutting head and a slide, and also comprising a clamping mechanism arranged on the slide of the laser cutting device, which comprises a cage, the cage comprising a short tube, a pressure plate and a steel wire connected between the short tube and the pressure plate, the steel wire is spiral, and the spiral diameters at both ends of the steel wire are larger than the middle spiral diameter, and the steel wires are arranged in a circular array about the short tube; the short tube is rotatably connected to a bracket, the bracket is fixedly sleeved with a sleeve, and the sleeve is coaxially sleeved with the cage, the end of the sleeve away from the bracket is fixedly connected to a brake disc, the brake disc is fitted with a friction plate, and the friction plate is fixedly connected to the pressure plate, the inner wall of the sleeve is provided with a retaining spring at the steel wire, and a spring is provided between the retaining spring and the pressure plate, and the cutting workpiece penetrates and inserts the sleeve, brake disc, friction plate and cage.

[0006] As a preferred solution of the laser cutting device for medical device production of the present invention, the sleeve has an opening along its axial direction, and the brake disc, friction plate and pressure plate are all arranged in a ring shape, the pressure plate is coaxially sleeved with a short ring, and the friction plate is fixedly sleeved with the short ring, and the brake disc is rotatably sleeved with the short ring, and countersunk screws are fastened in a ring array between the brake disc and the sleeve.

[0007] As a preferred solution of the laser cutting device for medical device production of the present invention, the bracket is provided with a circular hole, and a ring is fixedly provided at the opening of the circular hole at one end of the sleeve, and the sleeve opening is fixedly sleeved with the ring.

[0008] As a preferred solution of the laser cutting device for medical device production of the present invention, the outer wall of the sleeve is provided with heat sinks, and the heat sinks are arranged in a ring array with respect to the sleeve.

[0009] As a preferred solution of the laser cutting device for medical device production of the present invention, a pair of angular contact bearings are matched and sleeved between the short tube, the sleeve and the circular hole, and the angular contact bearings are assembled in a DB back-to-back manner.

[0010] As a preferred solution of the laser cutting device for medical device production of the present invention, wherein: the inner edge of the ring located at one end away from the bracket is provided with a limiting edge strip, and the outer edge of the short tube located at one end of the steel wire is also provided with a limiting edge strip, and the circular hole and the short tube are located at one end away from the limiting edge strip and are respectively threadedly connected with a pressure ring 1 and a pressure ring 2, the pressure ring 1 presses the outer ring of the angular contact bearing, and the pressure ring 2 presses the inner ring of the angular contact bearing.

[0011] As a preferred solution of the laser cutting device for medical device production of the present invention, the steel wire is made by braiding multiple strands of silk threads, and the surface of the steel wire is coated with rubber.

[0012] As a preferred solution of the laser cutting device for medical device production of the present invention, the spring is arranged in a conical shape, and the small diameter end of the spring is matched with the short ring, and a plane thrust bearing is arranged between the large diameter end of the spring and the retaining spring.

[0013] As a preferred solution of the laser cutting device for medical device production of the present invention, the bracket is also fixedly connected to a motor, and one end of the short tube extending outside the bracket is connected to the output shaft of the motor through a pulley and a belt drive.

[0014] As a preferred solution of the laser cutting device for medical device production of the present invention, the bottom of the bracket is fixedly connected to the slide, the cage is horizontally arranged, and the axis of the cage is parallel to the sliding direction of the slide, the laser cutting head is vertically arranged, and the cutting nozzle of the laser cutting head is perpendicular to the axis of the cage.

[0015] Beneficial effects of the laser cutting device for medical device production of the present invention: 1. The present invention forms a cage with a plurality of rubber-coated spiral steel wires, and the two ends of the cage are respectively connected to a driving device and a brake device, the brake device is used to provide a variable drag force for one end of the cage, the driving device is used to provide a clamping force for the cage, the workpiece plugged into the cage is clamped by the feature that the two ends of the cage rotate in opposite directions to gather the middle of the spiral steel wire, and the spiral steel wire generates a traction force on the brake device by the support effect of the workpiece on the spiral steel wire of the cage, thereby realizing automatic brake drag force control, and the rotation of the clamping mechanism can be started and stopped at any time after the cage clamps the workpiece; 2. The main moving parts in the clamping mechanism of the present invention are a cage composed of a short tube, a pressure plate and a steel wire. Compared with conventional steel chucks, it has extremely significant lightweight advantages, extremely low motion inertia and flexible and fast movements. It can effectively improve the efficiency of laser cutting of medical capillary metal tubes, and has a simple structure, easy production and very low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0017] Figure 1 Schematic diagram of the structure of a laser cutting device used in the production of medical devices.

[0018] Figure 2 This is a schematic diagram of the clamping mechanism structure of a laser cutting device used in the production of medical devices.

[0019] Figure 3 It is a cross-sectional view of the clamping mechanism structure.

[0020] Figure 4 for Figure 3 Schematic diagram of the structure after further sectioning of the stent.

[0021] Figure 5 for Figure 4 Structural breakdown diagram.

[0022] Figure 6 It is a schematic diagram of the structure of the auger of the clamping mechanism.

[0023] In the figure: 100, laser cutting head; 101, slide; 200, clamping mechanism; 201, cage; 202, short tube; 203, pressure plate; 204, steel wire; 205, bracket; 206, sleeve; 207, brake disc; 208, friction plate; 209, retaining spring; 210, plane thrust bearing; 211, spring; 212, angular contact bearing; 213, pressure ring 1; 214, pressure ring 2; 215, motor; 203a, short ring; 205a, round hole; 205b, sleeve ring; 206a, heat sink. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0025] Example, see Figure 1 to Figure 6 This embodiment provides a laser cutting device for medical device production, which achieves the effects of simplified structure, light weight and flexible start and stop by relatively twisting the two ends of the steel wire 204 bundle so that the steel wire 204 bundle is tightly wrapped around the medical capillary metal tube. Figure 1 As shown, it includes a laser cutting head 100 and a slide 101, and also includes a clamping mechanism 200 arranged on the slide 101 of the laser cutting device, such as Figure 3 and Figure 6 As shown, the clamping mechanism 200 includes a cage 201, and the cage 201 includes a short tube 202, a pressure plate 203, and a steel wire 204 connected between the short tube 202 and the pressure plate 203. The steel wire 204 is spiral, and the spiral diameters at both ends of the steel wire 204 are larger than the spiral diameter in the middle. The steel wire 204 is arranged in a ring array about the short tube 202; Figure 4As shown, the short tube 202 is rotatably connected to the bracket 205, the bracket 205 is fixedly sleeved with the sleeve 206, and the sleeve 206 is coaxially sleeved with the cage 201, and the end of the sleeve 206 away from the bracket 205 is fixedly connected to the inside of the brake disc 207, the brake disc 207 is fitted with a friction plate 208, and the friction plate 208 is fixedly connected to the pressure plate 203, the inner wall of the sleeve 206 is located at the steel wire 204. A spring 209 is provided, and a spring 211 is provided between the spring 209 and the pressure plate 203, and the cutting workpiece passes through the plug-in sleeve 206, the brake disc 207, the friction plate 208 and the cage 201.

[0026] Specifically, Figure 5 As shown, the sleeve 206 is opened along its axial direction, and the brake disc 207, the friction plate 208 and the pressure plate 203 are all arranged in an annular shape, the pressure plate 203 is coaxially sleeved with a short ring 203a, and the friction plate 208 is fixedly sleeved with the short ring 203a, and the brake disc 207 is rotatably sleeved with the short ring 203a, and the brake disc 207 is fastened with countersunk screws in an annular array between the brake disc 207 and the sleeve 206, the bracket 205 is provided with a circular hole 205a, and the circular hole 205a is fixedly provided with a collar 205b at the opening at one end of the sleeve 206, and the opening of the sleeve 206 is fixedly sleeved with the collar 205b, the outer wall of the sleeve 206 is provided with a heat sink 206a, and the heat sink 206a is arranged in an annular array with respect to the sleeve 206, and the short tube 202 is connected to the sleeve and the circular hole 205a. A pair of angular contact bearings 212 are matched and sleeved therebetween, and the angular contact bearings 212 are assembled in a DB back-to-back manner. A limiting edge strip is set on the inner edge of the ring 205b located at the end away from the bracket 205, and a limiting edge strip is also set on the outer edge of the end of the short tube 202 located at the steel wire 204. The circular hole 205a and the end of the short tube 202 located away from the limiting edge strip are respectively threadedly connected with a pressing ring 1 213 and a pressing ring 214. The pressing ring 1 213 presses the outer ring of the angular contact bearing 212, and the pressing ring 214 presses the inner ring of the angular contact bearing 212. The spring 211 is set in a conical shape, and the small diameter end of the spring 211 is matched and sleeved with the short ring 203a, and a plane thrust bearing 210 is set between the large diameter end of the spring 211 and the retaining spring 209.

[0027] like Figure 2 As shown, the bracket 205 is also fixedly connected to the motor 215, and one end of the short tube 202 extending outside the bracket 205 is connected to the output shaft of the motor 215 through a pulley and a belt drive, as shown in FIG. Figure 1 As shown, the bottom of the bracket 205 is fixedly connected to the slide 101, the cage 201 is horizontally arranged, and the axis of the cage 201 is parallel to the sliding direction of the slide 101, the laser cutting head 100 is vertically arranged, and the cutting nozzle of the laser cutting head 100 is perpendicular to the axis of the cage 201, as shown in FIG. Figure 6 As shown, the steel wire 204 is braided from multiple strands of wire, and the surface of the steel wire 204 is coated with rubber.

[0028] The present invention provides a laser cutting device for medical device production, wherein a clamping mechanism 200 is provided for moving a cutting workpiece relative to a laser cutting head 100, wherein a cage 201 is in contact with the cutting workpiece in the clamping mechanism 200, Figure 6 The cage 201 is composed of a plurality of rubber-coated spiral steel wires 204. The two ends of the spiral steel wires 204 are respectively fixed to the ends of the pressure plate 203 and the short tube 202. When the short tube 202 rotates relative to the pressure plate 203, two changes will occur: Firstly, the middle part of the cage 201 is twisted together, and the diameter of the middle part of the cage 201 becomes smaller, thereby partially wrapping the tubular workpiece passing through the cage 201; Secondly, when the middle part of the steel wire 204 wraps around the workpiece, the short tube 202 continues to rotate relative to the pressure plate 203, and is supported and restricted by the workpiece. The diameter of the middle part of the cage 201 can no longer be reduced, which will cause the spiral pitch of the steel wire 204 to tend to decrease, while the length of the steel wire 204 itself does not change, which will cause the two ends of the steel wire 204 to tend to pull the short tube 202 and the pressure plate 203 toward each other.

[0029] On the basis of the above principle, the present invention not only realizes the clamping and fixing of the workpiece, but also realizes the control of the workpiece rotation to start and stop at any time. The present invention also involves the following technical details: First, reference Figure 4 and Figure 5 , one end of the spring 211 that contacts the plane thrust bearing 210 remains unchanged relative to the sleeve 206 and the bracket 205 (referring to the axial direction of the spring 211), and the other end of the spring 211 pushes the extrusion plate 203, so that the pressure plate 203 presses the friction plate 208 against the brake disc 207. Since the brake disc 207 is fixed relative to the sleeve 206, sufficient static friction is established to keep the pressure plate 203 stationary relative to the sleeve 206. At this time, the motor 215 drives the short tube 202 to rotate, so that the short tube 202 rotates relative to the pressure plate 203, so that the cage 201 tightens the workpiece. If it is only necessary to clamp the workpiece without rotating the workpiece, the short tube 202 should stop rotating and remain relatively stationary after the steel wire 204 tightens the workpiece. The static torque is provided by the (stepping or servo) motor 215; Secondly, when the workpiece needs to be rotated, on the basis of the workpiece already being clamped, the motor 215 continues to drive the short tube 202 to rotate. Since the position of the short tube 202 (referring to the axial direction of the short tube 202) relative to the bracket 205 remains unchanged, the cage 201 tends to pull the pressure plate 203 in the direction of the short tube 202. When the pulling force increases to overcome the squeezing force of the spring 211, the pressure plate 203 no longer presses the friction plate 208. The static friction between the pressure plate 203 and the friction plate 208 relative to the brake disc 207 changes to sliding friction, which causes the cage 201 and the workpiece to rotate relative to the bracket 205. When it is necessary to stop, the motor 215 can be stopped. When the pressure plate 203 rotates with the short tube 202, the steel wire 204 can no longer increase the pulling force on the pressure plate 203. Therefore, no matter the pressure plate 203 and the brake disc 207 are relatively stationary, or the pressure plate 203 slides and rotates relative to the brake disc 207, the pressure plate 203 maintains the contact state with the brake disc 207. What changes is only the pressure between the pressure plate 203 and the brake disc 207. It should be noted that the clamping mechanism 200 only allows the motor 215 to rotate in one direction when working. If it rotates in the opposite direction relative to the rotation direction of the clamped workpiece, the steel wire 204 of the cage 201 will become loose, which is used to release the workpiece. A large number of heat sinks 206a are also provided on the outer wall of the sleeve 206 of the clamping mechanism 200 to dissipate the heat generated by the brake disc 207 and the friction plate 208 when the clamping mechanism 200 is in continuous operation for a long time; Thirdly, the angular contact bearing 212 assembled by BD helps to improve the rotational position accuracy of the cage 201 at one end of the short tube 202. The other end of the cage 201 obtains the rotational position accuracy by rotating the short ring 203a in the middle of the pressure plate 203 to connect the middle of the brake disc 207. The relative position between the brake disc 207 and the sleeve 206 can be adjusted by the assembly gap between the screw and the sleeve 206 to compensate for the assembly error between the sleeve 206, the bracket 205 and the cage 201.

[0030] In summary, the present invention comprises a plurality of rubber-coated spiral steel wires 204 to form a cage 201, and the two ends of the cage 201 are respectively connected to a driving device and a braking device, the braking device is used to provide a variable drag force for one end of the cage 201, the driving device is used to provide a clamping force for the cage 201, and the characteristics of the two ends of the cage 201 rotating in opposite directions to gather the middle of the spiral steel wire 204 are used to clamp the workpiece plugged into the cage 201, and the workpiece is used to support the spiral steel wire 204 of the cage 201, so that the spiral steel wire 204 can be clamped. The steel wire 204 generates traction on the brake device, thereby realizing automated brake drag force control. After the cage 201 clamps the workpiece, the rotation of the clamping mechanism 200 can be started and stopped at any time. The main moving parts of the clamping mechanism 200 of the present invention are the cage 201 composed of a short tube 202, a pressure plate 203 and a steel wire 204. Compared with conventional steel chucks, it has extremely significant lightweight advantages, extremely low motion inertia, flexible and fast movements, and can effectively improve the efficiency of laser cutting processing of medical capillary metal tubes.

[0031] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A laser cutting device for medical device production, comprising a laser cutting head (100) and a slide table (101), characterized in that: Also included is a clamping mechanism (200) arranged on a slide table (101) of the laser cutting device, comprising a twisting cage (201), the twisting cage (201) comprising a short tube (202), a pressure plate (203), and a steel wire (204) connected between the short tube (202) and the pressure plate (203), the steel wire (204) being in a spiral shape, and the spiral diameters at both ends of the steel wire (204) being larger than the spiral diameter in the middle, and the steel wires (204) being arranged in a ring array with respect to the short tube (202); The short tube (202) is rotatably connected to a bracket (205), the bracket (205) is fixedly sleeved with a sleeve (206), and the sleeve (206) is coaxially sleeved with a cage (201), and a brake disc (207) is fixedly connected to the inside of the sleeve (206) at one end away from the bracket (205), and a friction plate (208) is fitted on the brake disc (207), and the friction plate (208) is fixedly connected to the pressure plate (203), and a retaining spring (209) is provided on the inner wall of the sleeve (206) at the steel wire (204), and a spring (211) is provided between the retaining spring (209) and the pressure plate (203), and the cutting workpiece penetrates and inserts the sleeve (206), the brake disc (207), the friction plate (208) and the cage (201).

2. The laser cutting device for medical device production according to claim 1, characterized in that: The sleeve (206) has an opening along its axial direction, and the brake disc (207), friction plate (208) and pressure plate (203) are all arranged in an annular shape, the pressure plate (203) is coaxially sleeved with a short ring (203a), the friction plate (208) is fixedly sleeved with the short ring (203a), the brake disc (207) is rotatably sleeved with the short ring (203a), and countersunk screws are fastened in an annular array between the brake disc (207) and the sleeve (206).

3. The laser cutting device for medical device production according to claim 1, characterized in that: The bracket (205) is provided with a circular hole (205a), and a collar (205b) is fixedly provided at the opening of the circular hole (205a) located at one end of the sleeve (206), and the opening of the sleeve (206) is fixedly sleeved with the collar (205b).

4. The laser cutting device for medical device production according to claim 3, characterized in that: The outer wall of the sleeve (206) is provided with heat sinks (206a), and the heat sinks (206a) are arranged in a ring array relative to the sleeve (206).

5. The laser cutting device for medical device production according to claim 4, characterized in that: A pair of angular contact bearings (212) are matched and sleeved between the short tube (202), the sleeve and the circular hole (205a), and the angular contact bearings (212) are assembled in a DB back-to-back manner.

6. The laser cutting device for medical device production according to claim 5, characterized in that: The inner edge of the sleeve ring (205b) located away from the bracket (205) is provided with a limiting edge strip, and the outer edge of the end of the short tube (202) located on the steel wire (204) is also provided with a limiting edge strip, and the circular hole (205a) and the end of the short tube (202) located away from the limiting edge strip are respectively threadedly connected with a first pressing ring (213) and a second pressing ring (214), the first pressing ring (213) presses the outer ring of the angular contact bearing (212), and the second pressing ring (214) presses the inner ring of the angular contact bearing (212).

7. The laser cutting device for medical device production according to claim 1, characterized in that: The steel wire (204) is made by braiding a plurality of strands of silk threads, and the surface of the steel wire (204) is coated with rubber.

8. The laser cutting device for medical device production according to claim 7, characterized in that: The spring (211) is arranged in a conical shape, and the small diameter end of the spring (211) is matched and sleeved with the short ring (203a), and a plane thrust bearing (210) is arranged between the large diameter end of the spring (211) and the retaining spring (209).

9. The laser cutting device for medical device production according to claim 1, characterized in that: The bracket (205) is also fixedly connected to a motor (215), and one end of the short tube (202) extending outside the bracket (205) is connected to an output shaft of the motor (215) via a pulley and a belt transmission.

10. The laser cutting device for medical device production according to claim 9, characterized in that: The bottom of the bracket (205) is fixedly connected to the slide (101), the cage (201) is arranged horizontally, and the axis of the cage (201) is parallel to the sliding direction of the slide (101), the laser cutting head (100) is arranged vertically, and the cutting nozzle of the laser cutting head (100) is perpendicular to the axis of the cage (201).

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