A laser cutting device for medical device production

Abstract

The present invention relates to the field of laser cutting devices, and in particular to 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, wherein the cage comprises a short tube, a pressure plate, and a steel wire connected between the short tube and the pressure plate, wherein the steel wire is spiral-shaped, and the spiral diameters at both ends of the steel wire are larger than the middle spiral diameter, and the steel wire is arranged in a circular array about the short tube. The cage of the present invention is respectively connected to a driving device and a braking device at both ends, and the workpiece plugged into the cage is clamped by utilizing the characteristics that the middle part of the spiral steel wire is converged by the relative counter-rotation of the two ends of the cage. The main moving parts in the clamping mechanism of the present invention are the cage composed of the short tube, the pressure plate and the steel wire. Compared with conventional steel chucks, the cage has extremely significant lightweight advantages, extremely low motion inertia, and flexible and fast movements, which can effectively improve the efficiency of laser cutting processing of medical capillary metal tubes.

Description

Technical Field

[0001] The present 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 medical capillary metal tube wall structures 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 existing medical laser cutting devices to clamp capillary metal tubes 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 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. 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 laser cutting of medical capillary tubes. Not only does it have the obvious problem of poor start-stop flexibility, but it also has the 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, whose clamping structure has the advantages of being lighter, having smaller motion inertia, more flexible movements, simpler structure, lower cost and easier maintenance. Summary of the Invention

[0003] In view of the problems that the chucks for laser cutting of medical capillary metal tubes mentioned above or in the prior art have large weight, low flexibility 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 being spiral, and the spiral diameters at both ends of the steel wire being larger than the spiral diameter in the middle, and the steel wire being arranged in a circular array about the short tube; the short tube being rotatably connected to a bracket, the bracket being fixedly sleeved with a sleeve, and the sleeve being coaxially sleeved with the cage, the end of the sleeve away from the bracket being fixedly connected to a brake disc, the brake disc being fitted with a friction plate, and the friction plate being fixedly connected to the pressure plate, the inner wall of the sleeve being provided with a retaining spring at the steel wire, and a spring being provided between the retaining spring and the pressure plate, the cutting workpiece being inserted through the sleeve, the brake disc, the friction plate and the 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 connected to 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 is located away from the bracket and a limiting edge strip is provided, and the outer edge of the short tube is located at one end of the steel wire and a limiting edge strip is also provided, and the circular hole and the short tube are located at the 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 planar 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 the end of the short tube extending outside the bracket is connected to the output shaft of the motor through a pulley and a belt transmission.

[0014] As a preferred solution of the laser cutting device for medical device production of the present invention, wherein: 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:

[0016] 1. The present invention comprises a cage composed of multiple rubber-coated spiral steel wires, with a drive device and a brake device connected to each end of the cage. The brake device provides a variable drag force at one end of the cage, while the drive device provides a clamping force for the cage. The cage's two ends rotate in opposite directions, converging the middle portion of the spiral steel wire to clamp a workpiece plugged into the cage. The workpiece supports the cage's spiral steel wire, causing the spiral steel wire to generate traction on the brake device, thereby achieving automated brake drag force control. After the cage clamps the workpiece, the clamping mechanism can start and stop rotation at any time.

[0017] 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 an extremely significant lightweight advantage, extremely low motion inertia and flexible and fast movement, which can effectively improve the efficiency of laser cutting processing of medical capillary metal tubes. It has a simple structure, is easy to produce, and has a very low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 Schematic diagram of the structure of a laser cutting device used in the production of medical devices.

[0020] Figure 2This is a schematic diagram of the clamping mechanism structure of a laser cutting device used in the production of medical devices.

[0021] Figure 3 It is a cross-sectional view of the clamping mechanism structure.

[0022] Figure 4 for Figure 3 Schematic diagram of the structure after further sectioning of the bracket.

[0023] Figure 5 for Figure 4 Structural breakdown diagram.

[0024] Figure 6 Schematic diagram of the structure of the auger of the clamping mechanism.

[0025] 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; 206a, heat sink. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] Example, see Figures 1 to 6 This embodiment provides a laser cutting device for medical device production. By twisting the two ends of the steel wire 204 bundle relative to each other, the steel wire 204 bundle is tightly wrapped around the medical capillary metal tube, thereby achieving the effects of simplified structure, lightweight and flexible start and stop. 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, as shown in FIG. Figure 3 and Figure 6 As shown, the clamping mechanism 200 includes a cage 201, which 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 a 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, and the inner wall of the sleeve 206 is provided with a retaining spring 209 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 passes through the plug-in sleeve 206, the brake disc 207, the friction plate 208 and the cage 201.

[0028] Specifically, such as 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. Countersunk screws are fastened 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. 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. 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 between them, and the angular contact bearings 212 are assembled in a DB back-to-back manner. The inner edge of the ring 205b is located away from the bracket 205 and a limiting edge strip is provided, and the outer edge of the short tube 202 is located at one end of the steel wire 204 and a limiting edge strip is also provided. The circular hole 205a and the short tube 202 are located at the end away from the limiting edge strip and are respectively threadedly connected with a pressure ring 1 213 and a pressure ring 214. The pressure ring 1 213 presses the outer ring of the angular contact bearing 212, and the pressure 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. A plane thrust bearing 210 is provided between the large diameter end of the spring 211 and the retaining spring 209.

[0029] 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 transmission, 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.

[0030] The present invention provides a laser cutting device for medical device production, which mainly provides a clamping mechanism 200 for moving the cutting workpiece relative to the laser cutting head 100. The clamping mechanism 200 is in contact with the cutting workpiece and is a cage 201. Figure 6 The cage 201 is composed of multiple rubber-coated spiral steel wires 204. The ends of the spiral steel wires 204 are fixed to the ends of the pressure plate 203 and the short tube 202 respectively. When the short tube 202 rotates relative to the pressure plate 203, two changes will occur:

[0031] Firstly, the middle portion of the cage 201 is tightened and the diameter of the middle portion of the cage 201 is reduced, thereby partially tightening the tubular workpiece passing through the cage 201;

[0032] Secondly, after 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.

[0033] On the basis of the above principles, the present invention further aims to achieve both the clamping and fixation of the workpiece and the control of the start and stop of the workpiece rotation at any time. The present invention also involves the following technical details:

[0034] First, reference Figure 4 and Figure 5 , one end of the spring 211 contacts the plane thrust bearing 210, and the position relative to the sleeve 206 and the bracket 205 remains unchanged (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;

[0035] Secondly, when the workpiece needs to be rotated, the motor 215 continues to drive the short tube 202 to rotate on the basis of the workpiece being clamped. 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 winch 201 tends to pull the pressure plate 203 toward 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, causing the winch 201 and the workpiece to rotate relative to the bracket 205. When it is necessary to stop, the motor 215 can be stopped.

[0036] 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 whether 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.

[0037] 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 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.

[0038] Third, 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, and 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.

[0039] 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 characteristic that the two ends of the cage 201 rotate in opposite directions to converge the middle of the spiral steel wire 204 is 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 The steel wire 204 generates traction on the brake device, thereby realizing automatic 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 and flexible and fast movements, which can effectively improve the efficiency of laser cutting processing of medical capillary metal tubes.

[0040] 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 the present invention. 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 (101), characterized in that: The invention also includes a clamping mechanism (200) arranged on the slide (101) of the laser cutting device, which includes a twisting cage (201), the twisting cage (201) including 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 spiral, and the spiral diameters at both ends of the steel wire (204) being larger than the spiral diameter in the middle, and the steel wire (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 the end of the sleeve (206) away from the bracket (205) is fixedly connected to a 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 provided with a retaining spring (209) 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 is inserted through the sleeve (206), the brake disc (207), the friction plate (208) and the cage (201); The sleeve (206) is provided with 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) and the short ring (203a) are fixedly sleeved, and the brake disc (207) and the short ring (203a) are rotatably sleeved, and countersunk screws are fastened in an annular array between the brake disc (207) and the sleeve (206); 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) at one end of the sleeve (206), and the opening of the sleeve (206) is fixedly sleeved with the collar (205b); The inner edge of the sleeve (205b) located at one end away from the bracket (205) is provided with a limiting edge strip, and the outer edge of the short tube (202) located at one end of the steel wire (204) is also provided with a limiting edge strip, and the circular hole (205a) and the short tube (202) are respectively threadedly connected with a pressure ring 1 (213) and a pressure ring 2 (214) at one end away from the limiting edge strip, the pressure ring 1 (213) presses the outer ring of the angular contact bearing (212), and the pressure ring 2 (214) presses the inner ring of the angular contact bearing (212).

2. The laser cutting device for medical device production according to claim 1, wherein: 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).

3. The laser cutting device for medical device production according to claim 2, wherein: 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.

4. The laser cutting device for medical device production according to claim 1, wherein: The steel wire (204) is braided from multiple strands of silk thread, and the surface of the steel wire (204) is coated with rubber.

5. The laser cutting device for medical device production according to claim 4, characterized in that: The spring (211) is arranged in a conical shape, and the small diameter end of the spring (211) is matched 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).

6. The laser cutting device for medical device production according to claim 1, wherein: 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 the output shaft of the motor (215) via a pulley and a belt transmission.

7. The laser cutting device for medical device production according to claim 6, 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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