A method for improving catheter molding quality

Abstract

The present invention relates to a catheter forming module, an internal rolling non-expansion catheter forming machine, a method for improving the quality of catheter forming, and a processing method for catheter forming. The catheter forming module includes an expander and a working part. The expander includes a core shaft and a shell sleeved thereon. A plurality of limit grooves are provided on the circumference of one end of the shell. A roller is provided in the limit groove. The core shaft is located at one end of the roller and is a cone. The outer circumference of the roller is matched with the cone. The working part includes a main motor, a torque sensor and a first cylinder. The main motor is connected to the torque sensor, the torque sensor is connected to the core shaft, the main motor drives the core shaft to rotate, the first cylinder is connected to the core shaft, and the first cylinder drives the core shaft to press the roller. The present invention utilizes the strong compressibility of gas to continuously apply elastic pressing force to the rotating core shaft, so that the roller is tightly attached to the inner wall of the catheter, so that the torque of the main motor is completely transmitted to the roller, and a qualified groove depth is formed.

Description

Technical Field

[0001] The invention relates to the field of catheter molding processing, and in particular to a method for improving catheter molding quality. Background Art

[0002] At present, the connection between the catheter and the sleeve is mainly based on the expansion catheter, but the non-expansion catheter has more advantages in pressure resistance and sealing reliability. The forming of the non-expansion catheter is divided into internal expansion extrusion forming and internal rotation rolling forming. The internal rotation rolling forming has more advantages than the internal expansion extrusion forming in terms of production cost and product stability.

[0003] The current working mode of the internal rotation rolling forming equipment is implemented in the traditional torque forming mode: that is, for the forming of a catheter of a certain fixed specification, there is a feasible rotation rolling experience torque value based on past forming experience or previous experimental data. This experience torque value is pre-set in the control system. When processing a catheter of this specification, the equipment program determines that the processing is completed when the actual rotation rolling torque of the expander core shaft reaches the preset torque.

[0004] There is a certain linear relationship between the torque of the expander mandrel rotating rolling and the depth of the rolling groove on the inner wall of the tube. Because the actual torque of the expander mandrel rotating rolling is sometimes affected by the defects of the workpiece tube orifice or the sudden change of rolling force, it will cause a false response. In this way, the actual groove depth rolled out by the mandrel on the workpiece tube is not qualified, resulting in unstable forming quality. Summary of the invention

[0005] The purpose of the present invention is to provide a method for improving the quality of catheter forming, in view of the problem that the actual torque of the expander core shaft during rotational rolling in the prior art is sometimes caused by defects in the workpiece catheter orifice or sudden changes in rolling force, resulting in an erroneous response to a set torque value. In this way, the groove depth actually rolled out of the workpiece catheter by the core shaft is unqualified, thereby causing unstable forming quality.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A catheter forming module comprises an expander and a working component, wherein the expander comprises a core shaft and a shell sleeved thereon, a plurality of limit grooves are arranged on the circumference of one end of the shell, a roller is arranged in the limit groove, the core shaft is located at one end of the roller and is a cone, the outer circumferential surface of the roller matches the cone surface, the working component comprises a main motor, a torque sensor and a first cylinder, the main motor is connected to the torque sensor, the torque sensor is connected to the core shaft, the main motor drives the core shaft to rotate, the first cylinder is connected to the core shaft, and the first cylinder drives the core shaft to press the roller.

[0008] By adopting the catheter forming module described in the present invention, the dynamic real-time torque of the core shaft when it rotates with load can be detected through the torque sensor. At the same time, through the first cylinder, the strong compressibility of gas is utilized to continuously apply elastic pressing force to the rotating core shaft, so that the conical end of the core shaft tends to move forward. The conical end presses the roller tightly against the inner wall of the catheter, so that the torque of the main motor is completely transmitted to the roller. According to the linear relationship between the torque size and the rolling groove depth, that is, according to the real-time torque of the torque sensor reaching the set value, a qualified groove depth can be processed and formed. The catheter forming module has a simple structure and is easy to use. The rolling torque is used as an additional forming condition, and the obtained catheter forming quality is more stable and the effect is good.

[0009] Preferably, the working component also includes a first mounting seat and a second mounting seat, the first mounting seat is rotatably provided with a spline nut, the second mounting seat is provided with the torque sensor, the spline nut is connected to the torque sensor through a sleeve, the spline nut is matched with a spline shaft, and the spline shaft is connected to the core shaft.

[0010] With this structure, the main motor drives the sleeve to rotate through the sleeve, the spline shaft and the spline nut, the sleeve drives the spline nut to rotate, the spline nut drives the spline shaft to rotate, and the spline shaft drives the core shaft to rotate. At the same time, the cooperation between the spline shaft and the spline nut enables the spline shaft and the sleeve to move axially, thereby providing support for the first cylinder to drive the core shaft to move axially.

[0011] Further preferably, the end of the spline shaft is connected to the core shaft via a quick-change adapter.

[0012] By adopting this structure, the dilator of corresponding specifications can be quickly adapted to catheters with different inner diameters.

[0013] Further preferably, the working component further comprises a third mounting seat, and the main motor is arranged on the third mounting seat.

[0014] Further preferably, a reducer is provided on the third mounting seat, the main motor is connected to the reducer, the reducer is connected to a coupling, and the coupling is connected to the torque sensor.

[0015] With this structure, the main motor drives the reducer, the reducer drives the coupling to rotate, and the coupling drives the sleeve to rotate.

[0016] Preferably, the first cylinder is arranged on the first mounting seat, the telescopic rod of the first cylinder is connected to a multi-joint block, and the spline shaft is connected to the multi-joint block.

[0017] With this structure, the telescopic rod of the first cylinder and the spline shaft are connected through the multi-connection block, thereby achieving synchronous movement of the telescopic rod of the first cylinder and the core shaft.

[0018] Further preferably, two first cylinders are provided on the first mounting seat, the two first cylinders are located on both sides of the spline nut, and the telescopic rods of the first cylinders pass through the first mounting seat and are connected to both ends of the multi-link block.

[0019] With this structure, the synchronous movement of the two first cylinders can balance the force on the multi-joint block, avoid circumferential force on the spline shaft, and enable the spline shaft to move axially smoothly.

[0020] Further preferably, the spline shaft is connected to the middle part of the multi-joint block, and the spline shaft passes through the multi-joint block and is connected to the quick-change adapter.

[0021] Preferably, the working component further comprises a servo motor and a screw connected thereto, the screw is matched with a screw nut, the screw nut is connected to the multi-link block, and the screw is arranged parallel to the core shaft.

[0022] With this structure, the main motor drives the core shaft to rotate, and the servo motor drives the lead screw to rotate. The lead screw nut moves along the axial direction of the lead screw, that is, drives the multi-link block, the spline shaft and the core shaft to move axially along the core shaft, thereby controlling the movement of the tapered end of the core shaft, and can change the relative height of the roller so that the roller is tightly attached to the inner wall of the conduit, and can also completely transmit the torque of the main motor to the roller. According to the linear relationship between the torque size and the rolling groove depth, a qualified groove depth can be machined and formed. The servo motor, the lead screw and the lead screw nut have higher matching accuracy, the core shaft movement accuracy is higher, and the machined groove depth accuracy is higher. It should be noted that when the servo motor is used to control the axial movement of the core shaft, the first cylinder does not need to be actuated, and the first cylinder is follow-up.

[0023] Preferably, the screw rod passes through the first mounting seat and the second mounting seat, the screw rod is rotatably connected to the first mounting seat and the second mounting seat, and the screw rod nut is located between the first mounting seat and the second mounting seat.

[0024] With this structure, the movement range of the screw nut is limited by the installation distance between the first installation seat and the second installation seat, thereby limiting the maximum extension length of the expander and ensuring the coaxiality of the rotation.

[0025] Further preferably, the screw rod is located below the sleeve.

[0026] Preferably, the screw nut is connected to a connecting plate, the connecting plate is connected to a push rod, and the push rod is connected to the multi-link block.

[0027] With this structure, the linear motion of the screw nut is transmitted to the multi-joint block through the connecting plate and the push rod, that is, the servo motor drives the multi-joint block to drive the axial movement of the core shaft.

[0028] Further preferably, the connecting plate is fixedly connected to the push rod via a clamping block.

[0029] Further preferably, the connecting plate is provided with two push rods, the push rods are located on both sides of the screw nut, and the push rods are connected to both ends of the multi-link block after passing through the first mounting seat.

[0030] With this structure, the synchronous movement of the two push rods can balance the force on the multi-joint block, avoid circumferential force on the spline shaft, and enable the spline shaft to move axially smoothly.

[0031] Further preferably, the two first cylinders and the two push rods are symmetrically arranged with respect to the vertical axial plane of the core shaft.

[0032] With this structure, the torques output by the two symmetrically arranged first cylinders and the two push rods are balanced.

[0033] Preferably, the servo motor is connected to the screw rod via a transmission assembly.

[0034] Further preferably, the transmission assembly is a synchronous belt mechanism, a gear mechanism or a sprocket mechanism.

[0035] The present invention also provides an internal rolling non-expanding catheter forming machine, comprising a clamping component, a positioning component and a catheter forming module as described above, wherein the clamping component clamps the workpiece catheter, the positioning component clamps the expander, and moves the roller into the catheter.

[0036] The inner rolling non-expanding catheter forming machine described in the present invention is used to fix the catheter through the clamping component, clamp and move the expander through the positioning component, and the dynamic real-time torque of the core shaft when it rotates with load can be detected through the torque sensor. At the same time, through the first cylinder, the strong compressibility of gas is utilized to continuously apply elastic pressing force to the rotating core shaft, so that the conical end of the core shaft has a tendency to move forward, and the conical end presses the roller to be close to the inner wall of the catheter, so that the torque of the main motor is completely transmitted to the roller. According to the linear relationship between the torque size and the rolling groove depth, that is, according to the real-time torque of the torque sensor reaching the set value, a qualified groove depth can be machined and formed; if the inner hole size error of the catheter is large, it may cause the instability of the catheter rolling groove depth. The inner rolling non-expanding catheter forming machine aligns the catheter and the core shaft through the clamping component and the positioning component, drives the core shaft to rotate through the catheter forming module, and uses the rolling torque as an additional catheter forming condition, so that the catheter forming quality obtained is more stable, the structure is simple, the use is convenient, and the effect is good.

[0037] Preferably, the clamping component includes a clamping body, a nut and a half-clamping mold, the clamping body includes two upper and lower half-clamping seats, one end of the two half-clamping seats are hinged by a pin shaft, and the other end is connected by a movable screw, the upper end of the movable screw is connected to the nut, the two half-clamping seats are provided with grooves, and the half-clamping mold is arranged in the groove, when the clamping body is closed, the two half-clamping molds are closed, and the two half-clamping molds clamp the catheter.

[0038] With this structure, the clamping body can be locked by the nut, and the half clamping mold can evenly distribute the clamping force on the catheter, thereby protecting the catheter.

[0039] Further preferably, the nut is provided with a double ram horn handle, and the handle is rotated by manpower to achieve the clamping and loosening of the half-clamp.

[0040] Preferably, the positioning component includes a positioning block, a guide rod and a second cylinder, the positioning block includes two upper and lower half blocks, the two half blocks are detachably connected by a handle screw, the shell is clamped between the two half blocks, the lower half block is connected to the cylinder body of the second cylinder, the telescopic rod of the second cylinder is connected to the lower half clamp seat, the lower half clamp seat is fixedly connected to the guide rod, and the lower half block is slidably connected to the guide rod.

[0041] With this structure, the positioning block is moved closer to or farther away from the clamping body through the action of the second cylinder, so that the expander is extended into or out of the catheter. The guide rod plays a guiding role, so that the positioning block and the expander can operate stably and the expander and the catheter can be accurately aligned.

[0042] Further preferably, the lower half clamp seat is connected to two of the guide rods, the lower half block is connected to two of the second cylinders, and the two guide rods and the two second cylinders are symmetrically arranged with respect to the vertical axial plane of the core shaft.

[0043] With this structure, the torque output by the two symmetrically arranged second cylinders is balanced, and the two guide rods prevent the positioning block from being subjected to tangential force, thereby making the expander eccentric.

[0044] Preferably, the internal rolling non-expansion catheter forming machine also includes a base, and the lower half clamp seat, the first mounting seat, the second mounting seat and the third mounting seat are sequentially arranged on the base.

[0045] With this structure, the clamping component, the expander, the positioning component and the working component are connected in series through the base.

[0046] Preferably, the internal rolling non-expansion tube forming machine also includes a control system, and the control system is electrically connected to the main motor, the servo motor, the torque sensor, the first cylinder and the second cylinder.

[0047] Further preferably, the control system includes a control panel and a host connected thereto, the control panel is arranged on the base, and the control panel provides human-computer interaction.

[0048] Preferably, the internal rolling non-expansion catheter forming machine also includes a cabinet, the base is arranged on the top of the cabinet, and the main machine is arranged inside the cabinet.

[0049] Further preferably, movable wheels and brakes are provided at the bottom of the cabinet.

[0050] The present invention also provides a method for improving the quality of catheter molding, using the catheter molding module, the method comprising:

[0051] The main motor is used to drive the core shaft to rotate, and the torque sensor is used to detect the real-time torque value of the core shaft when the core shaft rotates with load. The first cylinder is used to continuously apply elastic pressing force to the rotating core shaft, so that the roller is closely attached to the rolling groove on the inner wall of the guide tube, thereby forming a torque control working mode;

[0052] Alternatively, the main motor is used to drive the core shaft to rotate, and the servo motor is used to drive the core shaft to move axially to control the relative height of the roller, so that the roller is closely attached to the rolling groove on the inner wall of the catheter, that is, a displacement control working mode is formed;

[0053] Alternatively, the main motor is used to drive the core shaft to rotate, and the torque sensor is used to detect the real-time torque value of the core shaft when it rotates with load. The servo motor is used to drive the axial movement of the core shaft to control the relative height of the roller, so that the roller is tightly attached to the rolling groove on the inner wall of the catheter, thereby forming a torque-displacement dual control working mode.

[0054] It should be noted that, in the displacement control working mode and the torque-displacement dual control working mode, when the servo motor is used to control the axial movement of the core shaft, the first cylinder does not need to be moved, and the first cylinder is a follower.

[0055] By adopting the method for improving the quality of catheter forming described in the present invention, three working modes, namely, torque control working mode, displacement control working mode or torque-displacement dual control working mode, can be realized through the catheter forming module. Different working modes can be selected according to differences in the size and shape and position tolerance of the catheter and the stability of the material, so that the quality of the processed product can be more stable.

[0056] The present invention also provides a method for processing catheter molding, using the method for improving the quality of catheter molding, comprising:

[0057] The first processing method: select the best working mode corresponding to the catheter of the same raw material by comparing the processing quality of the catheter under the three working modes;

[0058] The second processing method: selecting the best raw material of the catheter with good processing quality corresponding to the working mode by comparing the processing quality of catheters made of different raw materials under a working mode;

[0059] The one that produces a more stable catheter quality is selected from the two processing methods, the raw materials of the catheter are associated with the working mode of the processing, and input into the control system to form a database;

[0060] The database is retrieved on the control panel, the raw material of the catheter to be processed is selected, and the control system outputs the torque control working mode, the displacement control working mode or the torque-displacement dual control working mode.

[0061] By adopting the catheter forming processing method described in the present invention, a database is formed by associating the raw materials of the catheter with the processing working mode. In subsequent production, only the working mode corresponding to the raw material needs to be selected in the database, which improves the stability of product quality and can also timely discover regular defects of the catheter material.

[0062] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0063] 1. The catheter forming module described in the present invention can detect the dynamic real-time torque of the core shaft when it rotates with load through the torque sensor. At the same time, through the first cylinder, the strong compressibility of gas is used to continuously apply elastic pressing force to the rotating core shaft, so that the conical end of the core shaft has a tendency to move forward. The conical end presses the roller to be close to the inner wall of the catheter, so that the torque of the main motor is completely transmitted to the roller. According to the linear relationship between the torque size and the rolling groove depth, that is, according to the real-time torque of the torque sensor reaching the set value, a qualified groove depth can be processed and formed. The catheter forming module has a simple structure and is easy to use. The rolling torque is used as an additional forming condition, and the obtained catheter forming quality is more stable and the effect is good.

[0064] 2. A preferred catheter forming module of the present invention drives the core shaft to rotate through the main motor, and drives the lead screw to rotate through the servo motor, and the lead screw nut moves along the axial direction of the lead screw, that is, drives the multi-joint block, the spline shaft and the core shaft to move along the axial direction of the core shaft, thereby controlling the movement of the tapered end of the core shaft, and can change the relative height of the roller, so that the roller is close to the inner wall of the catheter, and can also make the torque of the main motor completely transmitted to the roller, according to the linear relationship between the torque size and the rolling groove depth, a qualified groove depth can be processed and formed, the servo motor, the lead screw and the lead screw nut have higher matching accuracy, the core shaft movement accuracy is higher, and the processed groove depth accuracy is higher;

[0065] 3. The inner rolling non-expanding catheter forming machine described in the present invention fixes the catheter through the clamping component, clamps and moves the expander through the positioning component, and can detect the dynamic real-time torque of the core shaft when it rotates with load through the torque sensor. At the same time, through the first cylinder, the strong compressibility of gas is utilized to continuously apply elastic pressing force to the rotating core shaft, so that the conical end of the core shaft has a tendency to move forward, and the conical end presses the roller to be close to the inner wall of the catheter, so that the torque of the main motor is completely transmitted to the roller. According to the linear relationship between the torque size and the rolling groove depth, that is, according to the real-time torque of the torque sensor reaching the set value, a qualified groove depth can be machined and formed; if the inner hole size error of the catheter is large, it may cause the instability of the catheter rolling groove depth. The inner rolling non-expanding catheter forming machine aligns the catheter and the core shaft through the clamping component and the positioning component, drives the core shaft to rotate through the catheter forming module, and uses the rolling torque as an additional catheter forming condition, so that the catheter forming quality obtained is more stable, and the structure is simple, easy to use, and the effect is good;

[0066] 4. A method for improving the quality of catheter molding according to the present invention can realize three working modes, namely, torque control working mode, displacement control working mode or torque-displacement dual control working mode, through the catheter molding module. Different working modes can be selected according to the size and shape and position tolerance of the catheter and the stability of the material, so that the quality of the processed product can be more stable.

[0067] 5. The catheter forming processing method described in the present invention forms a database by associating the raw materials of the catheter with the processing working mode. In subsequent production, it is only necessary to select the working mode corresponding to the raw material in the database, which improves the stability of product quality and can also timely discover regular defects of the catheter material. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 It is a schematic diagram of the structure of an internal rolling non-expansion catheter forming machine;

[0069] Figure 2 is a schematic diagram of the structure of the catheter forming module;

[0070] Figure 3 It is a schematic diagram of the structure of the clamping component and the positioning component;

[0071] Figure 4 is a cross-sectional view of a clamping member, a dilator and a positioning member;

[0072] Figure 5 It is a cross-sectional view of the dilator and catheter in coordination;

[0073] Figure 6 This is the installation diagram of the main motor, torque sensor and sleeve;

[0074] Figure 7 This is the installation cross-sectional view of the main motor, torque sensor and spline shaft;

[0075] Figure 8 This is the installation diagram of the servo motor, lead screw and spline shaft;

[0076] Fig. 9 This is the installation diagram of the first cylinder.

[0077] Markings in the figure: 100-catheter, 200-clamping component, 201-clamping body, 202-pressing nut, 203-half clamping mold, 300-expander, 301-mandrel, 302-housing, 303-roller, 400-positioning component, 401-positioning block, 402-guide rod, 403-second cylinder, 500-working component, 501-first mounting seat, 502-multi-unit block, 503-quick-change adapter, 504-first cylinder , 505-sleeve, 506-spline shaft, 507-spline nut, 511-second mounting seat, 512-transmission assembly, 513-servo motor, 514-screw, 515-screw nut, 516-connecting plate, 517-push rod, 518-clamp block, 521-third mounting seat, 522-torque sensor, 523-coupling, 524-reducer, 525-main motor, 600-control panel, 700-cabinet. DETAILED DESCRIPTION

[0078] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0079] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0080] Example 1

[0081] like Figures 1 to 9 As shown, the internal rolling non-expansion catheter forming machine described in the present invention includes a clamping component 200, a positioning component 400, a catheter forming module, a cabinet 700 and a control system. The catheter forming module includes a dilator 300 and a working component 500, and the control system includes a control panel 600 and a host connected thereto.

[0082] like Figure 2 , Figure 3 and Figure 4As shown, the clamping component 200 is used to clamp the workpiece conduit 100; specifically, the clamping component 200 includes a clamping body 201, a nut 202 and a half clamping die 203, the clamping body 201 includes two upper and lower half clamping seats, one end of the two half clamping seats is hinged by a pin, and the other end is connected by a live screw, the upper end of the live screw is connected to the nut 202, the two half clamping seats are provided with grooves, and the half clamping die 203 is arranged in the groove, When the clamping body 201 is closed, the two half-clamps 203 are closed together, and the two half-clamps 203 clamp the catheter 100. The pressing nut 202 is provided with a double ram horn handle, and the handle is rotated by manpower to achieve the clamping and loosening of the half-clamps 203. With this structure, the clamping body 201 can be locked by the pressing nut 202, and the half-clamps 203 can evenly distribute the clamping force on the catheter 100, thereby protecting the catheter 100.

[0083] like Figure 5 As shown, the expander 300 includes a core shaft 301 and a shell 302 sleeved thereon, a plurality of limiting grooves are provided on the circumference of one end of the shell 302, a roller 303 is provided in the limiting groove, the core shaft 301 is located at one end of the roller 303 and is a cone, and the outer circumferential surface of the roller 303 fits with the conical surface.

[0084] like Figure 2 , Figure 3 and Figure 4As shown, the positioning component 400 is used to clamp the shell 302 and move the roller 303 to extend into the conduit 100; the positioning component 400 includes a positioning block 401, a guide rod 402 and a second cylinder 403, the positioning block 401 includes two upper and lower half blocks, the two half blocks are detachably connected by a handle screw, the shell 302 is clamped between the two half blocks, the lower half block is connected to the cylinder body of the second cylinder 403, the telescopic rod of the second cylinder 403 is connected to the lower half clamp seat, the lower half clamp seat is fixedly connected to the guide rod 402, the lower half block is slidably connected to the guide rod 402, specifically, the lower half clamp seat is connected to two guide rods 402, the lower The half block is connected to two second cylinders 403, and the two guide rods 402 and the two second cylinders 403 are symmetrically arranged about the vertical axial plane of the core shaft 301. With this structure, the positioning block 401 is moved closer to or away from the clamping body 201 through the action of the second cylinder 403, so that the expander 300 is extended into or extended out of the catheter 100. The guide rod 402 plays a guiding role, so that the positioning block 401 and the expander 300 can operate stably, and the expander 300 and the catheter 100 can be accurately aligned. The torque output by the two symmetrically arranged second cylinders 403 is balanced, and the two guide rods 402 prevent the positioning block 401 from being subjected to tangential force, so that the expander 300 is eccentric.

[0085] like Figure 2 , Figure 6 , Figure 7 and Fig. 9As shown, the working component 500 includes a first mounting seat 501, a second mounting seat 511 and a third mounting seat 521, the first mounting seat 501 is rotatably provided with a spline nut 507, the first mounting seat 501 is also provided with a first cylinder 504, the telescopic rod of the first cylinder 504 is connected to a multi-link block 502, the second mounting seat 511 is provided with a torque sensor 522, the third mounting seat 521 is provided with a main motor 525 and a reducer 524, the main motor 525 is connected to the reducer 524, the reducer 524 is connected to a coupling 523, the coupling 523 is connected to the torque sensor 522, the The spline nut 507 is connected to the torque sensor 522 through a sleeve 505. The spline nut 507 is matched with a spline shaft 506. The spline shaft 506 is rotatably connected to the multi-joint block 502. The end of the spline shaft 506 is connected to the core shaft 301 through a quick-change adapter 503. Specifically, two first cylinders 504 are arranged on the first mounting seat 501. The two first cylinders 504 are located on both sides of the spline nut 507. The telescopic rod of the first cylinder 504 passes through the first mounting seat 501 and is connected to the two ends of the multi-joint block 502. The spline shaft 506 is connected to the middle part of the multi-joint block 502. The spline shaft 506 passes through the multi-joint block 502 and is connected to the quick-change adapter 503. With this structure, the main motor 525 drives the reducer 524, the reducer 524 drives the coupling 523 to rotate, the coupling 523 drives the sleeve 505 to rotate, the sleeve 505 drives the spline nut 507 to rotate, the spline nut 507 drives the spline shaft 506 to rotate, the spline shaft 506 drives the core shaft 301 to rotate, and at the same time, the spline shaft 506 and the spline nut 507 cooperate to enable the spline shaft 506 and the sleeve 505 to move axially, thereby providing the first cylinder 504 drives the core shaft 301 to move axially to provide support, so that the core shaft 301 presses the roller 303, and the quick-change adapter 503 can quickly adapt the expander 300 of corresponding specifications for catheters 100 with different inner diameters. The telescopic rod of the first cylinder 504 and the spline shaft 506 are connected through the multi-link block 502 to achieve synchronous movement of the telescopic rod of the first cylinder 504 and the core shaft 301, wherein the synchronous movement of the two first cylinders 504 can balance the force of the multi-link block 502, avoid circumferential force on the spline shaft 506, and enable the spline shaft 506 to move axially smoothly.

[0086] like Figure 2 , Figure 6 , Figure 7 and Figure 8As shown, the working component 500 also includes a servo motor 513 and a screw rod 514. The servo motor 513 is connected to the screw rod 514 through a transmission assembly 512. The screw rod 514 is equipped with a screw nut 515. The screw nut 515 is connected to the multi-link block 502. The screw rod 514 is arranged parallel to the core shaft 301. The screw rod 514 passes through the first mounting seat 501 and the second mounting seat 511. The screw rod 514 is rotatably connected to the first mounting seat 501 and the second mounting seat 511. The screw nut 515 is located between the first mounting seat 501 and the second mounting seat 511, the screw 514 is located below the sleeve 505, the screw nut 515 is connected to the connecting plate 516, the connecting plate 516 is connected to the push rod 517, the push rod 517 is connected to the multi-link block 502, the connecting plate 516 is fixedly connected to the push rod 517 through a clamping block 518, specifically, the connecting plate 516 is provided with two push rods 517, and the push rods 517 are located on both sides of the screw nut 515 The push rod 517 passes through the first mounting seat 501 and is connected to the two ends of the multi-link block 502. The two first cylinders 504 and the two push rods 517 are symmetrically arranged about the vertical axis of the core shaft 301. The transmission assembly 512 is a synchronous belt mechanism, a gear mechanism or a sprocket mechanism. With this structure, the movement range of the screw nut 515 is limited by the installation distance between the first mounting seat 501 and the second mounting seat 511, thereby limiting the maximum extension length of the expander 300, ensuring the rotation The coaxiality of the screw nut 515 is achieved by transmitting the linear motion of the screw nut 515 to the multi-joint block 502 through the connecting plate 516 and the push rod 517, that is, the servo motor 513 drives the multi-joint block 502 to drive the axial movement of the core shaft 301. The synchronous motion of the two push rods 517 can balance the force on the multi-joint block 502 and avoid the circumferential force on the spline shaft 506, so that the spline shaft 506 can move axially smoothly. The torque output by the two symmetrically arranged first cylinders 504 and the two push rods 517 is balanced.

[0087] It should be noted that when the servo motor 513 is used to control the axial movement of the core shaft 301 , the first cylinder 504 does not need to move, and the first cylinder 504 is a follower.

[0088] like Figure 1As shown, a base is provided on the top of the cabinet 700, and moving wheels and brakes are provided on the bottom of the cabinet 700. The host is arranged inside the cabinet 700, and the control panel 600 is arranged on the base. The control panel 600 provides human-computer interaction. The host is electrically connected to the main motor 525, the servo motor 513, the torque sensor 522, the first cylinder 504 and the second cylinder 403. The host is used to control the movement of the main motor 525, the servo motor 513, the first cylinder 504 and the second cylinder 403, and is used to process and store the main motor 525, the data of the servo motor 513, the torque sensor 522, the first cylinder 504 and the second cylinder 403, the host includes a processor and a memory; specifically, the lower half clamping seat, the first mounting seat 501, the second mounting seat 511 and the third mounting seat 521 are sequentially arranged on the base, and the positioning component 400 is located between the clamping component 200 and the first mounting seat 501. With this structure, the clamping component 200, the expander 300, the positioning component 400 and the working component 500 are connected in series through the base.

[0089] The inner rolling non-expanding catheter forming machine described in this embodiment can fix the catheter 100 through the clamping component 200, clamp and move the expander 300 through the positioning component 400, and detect the dynamic real-time torque of the core shaft 301 when it rotates with a load through the torque sensor 522. At the same time, through the first cylinder 504, the strong compressibility of gas is utilized to continuously apply elastic pressing force to the rotating core shaft 301, so that the conical end of the core shaft 301 tends to move forward, and the conical end presses the The roller 303 is tightly attached to the inner wall of the catheter 100, so that the torque of the main motor 525 is completely transmitted to the roller 303. According to the linear relationship between the torque size and the rolling groove depth, that is, according to the real-time torque of the torque sensor 522 reaching the set value, a qualified groove depth can be processed and formed; on the other hand, the main motor 525 can drive the core shaft 301 to rotate, and the servo motor 513 can drive the screw rod 514 to rotate, and the screw rod nut 515 moves along the axial direction of the screw rod 514, that is, drives the multi-joint block 502, the spline shaft 506 and the mandrel 301 move along the axial direction of the mandrel 301, thereby controlling the movement of the conical end of the mandrel 301, which can change the relative height of the roller 303, so that the roller 303 is closely attached to the inner wall of the catheter 100, and the torque of the main motor 525 can be completely transmitted to the roller 303. According to the linear relationship between the torque size and the rolling groove depth, a qualified groove depth can be processed and formed. The matching accuracy of the servo motor 513, the screw rod 514 and the screw rod nut 515 is higher, The core shaft 301 has higher movement accuracy and higher processing groove depth accuracy; if the inner hole size error of the catheter 100 is large, it may cause instability in the rolling groove depth of the catheter 100. The inner rolling non-expansion catheter forming machine aligns the catheter 100 and the core shaft 301 through the clamping component 200 and the positioning component 400, drives the core shaft 301 to rotate through the catheter forming module, and uses the rolling torque as an additional forming condition for the catheter 100. The obtained catheter 100 has more stable forming quality, simple structure, easy use and good effect.

[0090] Example 2

[0091] The present invention also provides a method for improving the quality of catheter forming, using an inner rolling non-expansion catheter forming machine as described in Example 1, the method comprising:

[0092] The main motor 525 is used to drive the core shaft 301 to rotate, and the torque sensor 522 detects the real-time torque value of the core shaft 301 when rotating with load. The first cylinder 504 is used to continuously apply elastic pressing force to the rotating core shaft 301, so that the roller 303 is closely attached to the rolling groove on the inner wall of the catheter 100, that is, a torque control working mode is formed;

[0093] Alternatively, the main motor 525 is used to drive the core shaft 301 to rotate, and the servo motor 513 is used to drive the core shaft 301 to move axially to control the relative height of the roller 303, so that the roller 303 is closely attached to the rolling groove on the inner wall of the catheter 100, that is, a displacement control working mode is formed;

[0094] Alternatively, the main motor 525 is used to drive the core shaft 301 to rotate, and the torque sensor 522 detects the real-time torque value of the core shaft 301 when rotating with load. The servo motor 513 drives the axial movement of the core shaft 301 to control the relative height of the roller 303, so that the roller 303 is tightly attached to the rolling groove on the inner wall of the catheter 100, thereby forming a torque-displacement dual control working mode.

[0095] It should be noted that, in the displacement control working mode and the torque-displacement dual control working mode, when the servo motor 513 is used to control the axial movement of the core shaft 301, the first cylinder 504 does not need to be moved, and the first cylinder 504 is a follower.

[0096] The method for improving the quality of catheter molding described in this embodiment can realize three working modes: torque control working mode, displacement control working mode or torque-displacement dual control working mode through the catheter molding module. Different working modes can be selected according to differences in the size and shape and position tolerance of the catheter 100 and the stability of the material, which can make the quality of the processed product more stable.

[0097] Example 3

[0098] The present invention also provides a method for processing a catheter, using the method for improving the quality of catheter molding as described in Example 2, comprising:

[0099] The first processing method: selecting the best working mode corresponding to the catheter 100 of the same raw material by the processing quality of the catheter 100 under the three working modes;

[0100] The second processing method: selecting the best material of the catheter 100 with good processing quality corresponding to the working mode by comparing the processing quality of the catheter 100 made of different raw materials under a working mode;

[0101] The one that can produce a more stable quality of the catheter 100 is selected from the two processing methods, and the raw material of the catheter 100 is associated with the processing working mode, and input into the control system to form a database;

[0102] The database is retrieved on the control panel 600, the raw material of the catheter 100 to be processed is selected, and the control system outputs a torque control working mode, a displacement control working mode or a torque-displacement dual control working mode.

[0103] The catheter forming processing method described in this embodiment forms a database by associating the raw materials of the catheter 100 with the processing working mode. In subsequent production, it is only necessary to select the working mode corresponding to the raw material in the database, which improves the stability of product quality and can also timely discover regular defects of the catheter 100 material.

[0104] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for improving the quality of catheter molding, characterized in that: An internal rolling non-expanding catheter forming machine is used, wherein the internal rolling non-expanding catheter forming machine includes a catheter forming module; The catheter forming module comprises a dilator (300) and a working component (500); The expander (300) comprises a core shaft (301) and a shell (302) sleeved thereon, a plurality of limit grooves are arranged on the circumference of one end of the shell (302), a roller (303) is arranged in the limit groove, one end of the core shaft (301) located on the roller (303) is a cone, and the outer circumferential surface of the roller (303) is matched with the conical surface; The working component (500) comprises a main motor (525), a torque sensor (522), a first cylinder (504), a spline nut (507), a servo motor (513) and a screw rod (514); The main motor (525) is connected to the torque sensor (522), the torque sensor (522) is connected to the spindle (301), and the main motor (525) drives the spindle (301) to rotate; The first cylinder (504) is connected to the core shaft (301), and the first cylinder (504) drives the core shaft (301) to press the roller (303); The spline nut (507) is connected to the torque sensor (522) via a sleeve (505); a spline shaft (506) is matched on the spline nut (507), and the spline shaft (506) is connected to the core shaft (301); The telescopic rod of the first cylinder (504) is connected to a multi-joint block (502), and the spline shaft (506) is connected to the multi-joint block (502); The servo motor (513) is connected to the screw rod (514), the screw rod (514) is matched with a screw rod nut (515), the screw rod nut (515) is connected to the multi-link block (502), and the screw rod (514) is arranged in parallel with the core shaft (301); The method includes: The main motor (525) is used to drive the core shaft (301) to rotate, and the torque sensor (522) detects the real-time torque value of the core shaft (301) when the core shaft (301) rotates with a load. The first cylinder (504) is used to continuously apply an elastic pressing force to the rotating core shaft (301), so that the roller (303) is closely attached to the rolling groove on the inner wall of the guide tube (100), thereby forming a torque control working mode; Alternatively, the main motor (525) is used to drive the core shaft (301) to rotate, and the servo motor (513) is used to drive the core shaft (301) to move axially to control the relative height of the roller (303), so that the roller (303) is closely attached to the rolling groove on the inner wall of the catheter (100), thus forming a displacement control working mode; Alternatively, the main motor (525) is used to drive the core shaft (301) to rotate, and the torque sensor (522) detects the real-time torque value of the core shaft (301) when it rotates with a load. The servo motor (513) is used to drive the core shaft (301) to move axially to control the relative height of the roller (303), so that the roller (303) is tightly attached to the rolling groove on the inner wall of the catheter (100), thereby forming a torque-displacement dual control working mode.

2. The method for improving the catheter molding quality according to claim 1, characterized in that: The working component (500) further comprises a first mounting seat (501) and a second mounting seat (511); the spline nut (507) is rotatably mounted on the first mounting seat (501); the first cylinder (504) is mounted on the first mounting seat (501); and the torque sensor (522) is mounted on the second mounting seat (511).

3. The method for improving catheter molding quality according to claim 2, characterized in that: The screw rod (514) passes through the first mounting seat (501) and the second mounting seat (511), the screw rod (514) is rotatably connected to the first mounting seat (501) and the second mounting seat (511), and the screw rod nut (515) is located between the first mounting seat (501) and the second mounting seat (511).

4. The method for improving the quality of catheter molding according to claim 1, characterized in that: The screw nut (515) is connected to a connecting plate (516), the connecting plate (516) is connected to a push rod (517), and the push rod (517) is connected to the multi-link block (502).

5. The method for improving catheter molding quality according to claim 1, characterized in that: The servo motor (513) is connected to the screw rod (514) via a transmission assembly (512).

6. The method for improving the catheter molding quality according to any one of claims 1 to 5, characterized in that: The internal rolling non-expansion catheter forming machine also includes a clamping component (200) and a positioning component (400); The clamping component (200) clamps the workpiece conduit (100); The positioning component (400) clamps the expander (300) and moves the roller (303) to extend into the catheter (100).

7. A method for forming a catheter, characterized in that: The method for improving the quality of catheter molding according to any one of claims 1 to 6 comprises: The first processing method is to select the best working mode corresponding to the catheter (100) of the same raw material by comparing the processing quality of the catheter (100) under the three working modes; The second processing method is to select the best raw material of the catheter (100) with good processing quality corresponding to the working mode by selecting the best raw material of the catheter (100) with good processing quality under a working mode. Selecting the one of the two processing methods that produces a catheter (100) with more stable quality, associating the raw material of the catheter (100) with the processing working mode, and inputting them into the control system to form a database; The database is retrieved on the control panel (600), the raw material of the catheter (100) to be processed is selected, and the control system outputs a torque control working mode, a displacement control working mode or a torque-displacement dual control working mode.

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