A thin catheter tip roll forming device

Abstract

The application provides a thin catheter end roll forming device, which comprises a turbine shaft, a worm shaft, a positioning seat, a supporting plate, a first bearing, a second bearing, a positioning plate, a driven shaft, a third bearing, a convex forming shaft, a concave forming shaft, a shoulder hexagonal nut, an inner hexagonal screw, a positioning pin and a multi-handle nut, wherein the turbine shaft is vertically installed and sequentially comprises a threaded section, a shaft positioning section, an upper bearing connecting section, a turbine section and a lower bearing connecting section from top to bottom; the worm shaft is horizontally installed and sequentially comprises a left bearing connecting section, a worm section, a right bearing connecting section and a threaded section from left to right; the turbine section of the turbine shaft is engaged with the worm section of the worm shaft; the lower bearing connecting section of the turbine shaft is connected with the positioning seat through the first bearing, the left bearing connecting section and the right bearing connecting section of the worm shaft are connected with the positioning seat through the second bearing, and the upper part of the turbine shaft is connected with the supporting plate through the first bearing.

Description

Technical Field

[0001] This invention relates to the field of catheter tip forming, and more specifically to a thin catheter tip wavy forming apparatus. Background Technology

[0002] Helicopter hydraulic systems contain numerous pipelines, often with thin-walled conduits. Various conduit connection methods exist, one of which involves HB4-110 conduit tip corrugation, where a raised ring is formed at the conduit end for sealing. Previously, this was achieved using specialized tooling and equipment to stretch a mandrel and compress a polyurethane ring, shaping the conduit to fit a concave cavity and creating the corrugation at the end. This method suffers from drawbacks such as long manufacturing cycles for specialized tooling, relatively high tooling costs, the consumption of large quantities of polyurethane rings, the tendency for the polyurethane rings to harden and scratch the inner surface of the conduit, cumbersome disassembly, and extremely low production efficiency. Therefore, a universal device for achieving conduit tip corrugation is urgently needed. Summary of the Invention

[0003] This application provides a thin-walled catheter tip corrugation forming device, which can solve the problems of high cost, low efficiency and poor inner surface quality of catheter tip corrugation forming.

[0004] Technical solution: A thin-diameter conduit end corrugation forming device, comprising a turbine shaft 1, a worm shaft 2, a positioning seat 3, a support plate 4, a first bearing 5, a second bearing 6, a positioning plate 7, a driven shaft 8, a third bearing 9, a convex forming shaft 10, a concave forming shaft 11, a shouldered hexagonal nut 12, an internal hexagonal screw 13, a positioning pin 14, and a multi-handled nut 15, wherein: The turbine shaft 1 is installed vertically and consists of a threaded section, a shaft positioning section, an upper bearing connection section, a turbine section, and a lower bearing connection section from top to bottom. The worm shaft is installed horizontally, and from left to right, it consists of the left bearing connecting section, the worm section, the right bearing connecting section, and the threaded section. The turbine section in turbine shaft 1 meshes with the worm section in worm shaft 2; The lower bearing connecting section of the turbine shaft 1 is connected to the positioning seat 3 via the first bearing 5. The left and right bearing connecting sections of the worm shaft 2 are connected to the positioning seat 3 via the second bearing 6. The upper part of the turbine shaft 1 is connected to the support plate 4 via the first bearing 5. The positioning plate 7 is laterally positioned with the positioning seat 3 by the positioning pin 14, and a bidirectional stepped through hole is vertically formed, through which the driven shaft 8 passes. The driven shaft 8 consists of a threaded section, a shaft positioning section, an upper bearing connection section, a transition section, and a lower bearing connection section from top to bottom. The upper bearing connection section and the lower bearing connection section of the driven shaft 8 are connected to the positioning plate 7 via a third bearing 9. The turbine shaft 1 positioning section is clearance-fitted with the concave shaft 11, and the driven shaft 8 positioning section is clearance-fitted with the convex shaft 10. Both are locked with shouldered hexagonal nuts 12. The convex forming shaft 10 is a hollow rotating body structure. The upper part is an outer cylindrical surface smaller than the inner diameter of the conduit. The middle of the outer cylindrical surface has an annular protrusion. The height of the annular protrusion is greater than the height of the rolling wave at the end of the conduit to be formed. The lower part is a limiting outer boss cylindrical surface, which is used to ensure the height of the rolling wave position at the end of the conduit. The concave forming shaft 11 is a hollow rotating body structure. Its upper part is a cylindrical surface, and there is a semi-circular groove at the height corresponding to the annular protrusion of the convex forming shaft 10. Its lower part is a reduced-diameter cylindrical surface to avoid interference with the cylindrical surface of the limiting outer boss of the convex forming shaft 10. Support plate 4 is fixed to positioning seat 3 by internal hex screws 13; The multi-handle nut 15 is fixed to the threaded section of the worm shaft 2, driving the mechanism to rotate and achieve roll forming.

[0005] Specifically, the rotation center hole of the convex shaft 10 and the locating section of the driven shaft 8 are in clearance fit.

[0006] Specifically, the rotation center hole of the concave shaft 11 and the shaft positioning section of the turbine shaft 1 are in clearance fit.

[0007] Specifically, the radius of the annular protrusion section of the convex forming shaft 10 is R4mm; the distance from the highest point of the annular protrusion of the convex forming shaft 10 to the outer cylindrical surface L of the convex forming shaft 10 is 3mm.

[0008] Specifically, the distance H from the highest point of the annular protrusion of the convex forming shaft 10 to the cylindrical surface of the outer boss of the limiting convex forming shaft 10 is required to be 5.5±0.2mm.

[0009] Specifically, the coaxiality of the mounting hole of the first bearing 5 on the positioning seat 3 and the mounting hole of the first bearing 5 on the support plate 4 should be ≤0.1mm.

[0010] Specifically, the coaxiality of the two mounting holes of the second bearing 6 on the positioning seat 3 should be ≤0.1mm.

[0011] Specifically, the coaxiality of the two mounting holes of the third bearing 9 on the positioning plate 7 should be ≤0.1mm.

[0012] Specifically, the positioning pin 14 and the hole on the positioning seat 3 are interference fit, and the positioning pin 14 and the hole on the positioning plate 7 are clearance fit.

[0013] In summary, this application provides a thin-walled catheter tip corrugating device that only requires clamping with a vise and manual drive. The device achieves a series of thin-walled catheter tip corrugations by rolling the inner and outer radial sides of the catheter with a convex forming shaft and a concave forming shaft. This avoids the investment in a large amount of specialized tooling and the consumption of disposable polyurethane rings, and prevents scratches on the inner surface of the catheter. Therefore, it solves the problems of high cost, low efficiency, and poor inner surface quality in catheter tip corrugation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a waveguide with a rolled end. Figure 2 A schematic diagram of the front view of a thin conduit tip corrugation forming device provided in this application; Figure 3 A schematic diagram of the rolling structure of a thin conduit end rolling corrugation forming device provided in this application, taken from direction A. Figure 4 A schematic diagram of the guide structure of a thin conduit end rolling corrugation forming device provided in this application, shown in section B. Figure 5 A schematic diagram of the C-direction cross-sectional view of the driving structure of the thin conduit end rolling wave forming device provided in this application; Figure 6 A schematic diagram of a partial enlarged view of the rolling structure I of a thin conduit end rolling corrugation forming device provided in this application; Figure 7 A schematic diagram of an axial side view of a thin conduit tip corrugation forming device provided in this application; Among them, the turbine shaft 1, worm shaft 2, positioning seat 3, support plate 4, first bearing 5, second bearing 6, positioning plate 7, driven shaft 8, third bearing 9, convex shaft 10, concave shaft 11, shouldered hexagonal nut 12, internal hexagonal screw 13, positioning pin 14, and multi-handle nut 15. Detailed Implementation

[0015] like Figure 1 As shown, the conduit tip rolling and corrugating device provided in this application is used to roll thin conduit tips into annular protrusions.

[0016] Example 1 like Figure 2-7 As shown, this application provides a thin-diameter conduit end corrugation forming device, comprising a turbine shaft 1, a worm shaft 2, a positioning seat 3, a support plate 4, a first bearing 5, a second bearing 6, a positioning plate 7, a driven shaft 8, a third bearing 9, a convex forming shaft 10, a concave forming shaft 11, a shouldered hexagonal nut 12, an internal hexagonal screw 13, a positioning pin 14, and a multi-handle nut 15, wherein: The turbine shaft 1 is installed vertically and consists of a threaded section, a shaft positioning section, an upper bearing connection section, a turbine section, and a lower bearing connection section from top to bottom.

[0017] The worm shaft is installed horizontally, and from left to right, it consists of the left bearing connecting section, the worm section, the right bearing connecting section, and the threaded section.

[0018] The turbine section in turbine shaft 1 meshes with the worm section in worm shaft 2.

[0019] The lower bearing connecting section of the turbine shaft 1 is connected to the positioning seat 3 via the first bearing 5. The left and right bearing connecting sections of the worm shaft 2 are connected to the positioning seat 3 via the second bearing 6. The upper part of the turbine shaft 1 is connected to the support plate 4 via the first bearing 5.

[0020] The positioning plate 7 is laterally positioned with the positioning seat 3 by the positioning pin 14, and a bidirectional stepped through hole is vertically formed, through which the driven shaft 8 passes.

[0021] The driven shaft 8 consists of a threaded section, a shaft positioning section, an upper bearing connection section, a transition section, and a lower bearing connection section, arranged from top to bottom. The upper and lower bearing connection sections of the driven shaft 8 are connected to the positioning plate 7 via a third bearing 9.

[0022] The turbine shaft 1 positioning section is clearance-fitted with the concave shaft 11, and the driven shaft 8 positioning section is clearance-fitted with the convex shaft 10. Both are locked with shouldered hexagonal nuts 12.

[0023] The convex forming shaft 10 is a hollow rotating body structure. The upper part is an outer cylindrical surface smaller than the inner diameter of the conduit. The middle of the outer cylindrical surface has an annular protrusion. The height of the annular protrusion is greater than the height of the rolling wave at the end of the conduit to be formed. The lower part is a limiting outer boss cylindrical surface, which is used to ensure the height of the rolling wave position at the end of the conduit.

[0024] The concave forming shaft 11 is a hollow rotating body structure. Its upper part is a cylindrical surface, and there is a semi-circular groove at the height corresponding to the annular protrusion of the convex forming shaft 10. Its lower part is a reduced-diameter cylindrical surface to avoid interference with the cylindrical surface of the limiting outer boss of the convex forming shaft 10.

[0025] The support plate 4 is fixed to the positioning seat 3 by the internal hex screws 13.

[0026] The multi-handle nut 15 is fixed to the threaded section of the worm shaft 2, driving the mechanism to rotate and achieve roll forming.

[0027] Specifically, the rotation center hole of the convex shaft 10 and the locating section of the driven shaft 8 are in clearance fit.

[0028] Specifically, the rotation center hole of the concave shaft 11 and the shaft positioning section of the turbine shaft 1 are in clearance fit.

[0029] Specifically, the radius of the annular protrusion section of the convex forming shaft 10 is R4mm; the distance from the highest point of the annular protrusion of the convex forming shaft 10 to the outer cylindrical surface L of the convex forming shaft 10 is 3mm.

[0030] Specifically, the distance H from the highest point of the annular protrusion of the convex forming shaft 10 to the cylindrical surface of the outer boss of the limiting convex forming shaft 10 is required to be 5.5±0.2mm.

[0031] Specifically, the coaxiality of the mounting hole of the first bearing 5 on the positioning seat 3 and the mounting hole of the first bearing 5 on the support plate 4 should be ≤0.1mm.

[0032] Specifically, the coaxiality of the two mounting holes of the second bearing 6 on the positioning seat 3 should be ≤0.1mm.

[0033] Specifically, the coaxiality of the two mounting holes of the third bearing 9 on the positioning plate 7 should be ≤0.1mm.

[0034] Specifically, the positioning pin 14 and the hole on the positioning seat 3 are interference fit, and the positioning pin 14 and the hole on the positioning plate 7 are clearance fit.

[0035] In summary, this application provides a thin-walled catheter tip corrugating device. By implementing this device, only a vise clamping and manual drive are required. The device uses a convex forming shaft and a concave forming shaft to roll and press the catheter radially inwards and outwards, achieving a series of thin-walled catheter tip corrugations. This avoids the investment in large amounts of specialized tooling and the consumption of disposable polyurethane rings, and prevents scratches on the inner surface of the catheter. Therefore, it solves the problems of high cost, low efficiency, and poor inner surface quality in catheter tip corrugating.

[0036] Example 2 This application provides a method for using a thin conduit tip corrugating device, the method comprising: Step 1: The worm shaft 2 is fixed to the positioning seat 3 by the second bearing 6; Step 2: The lower bearing connecting section of the turbine shaft 1 is fixed to the positioning seat 3 via the first bearing 5. The first bearing 5 is embedded in the support plate 4 and then connected to the upper bearing connecting section of the turbine shaft 1 to ensure smooth connection between the worm shaft 2 worm section and the turbine shaft 1 turbine section. The support plate 4 is fixed to the positioning seat 3 with hexagon socket screws 13. The threaded section of the worm shaft 2 is connected to the multi-handle nut 15. A positioning pin 14 is installed on the side of the positioning seat 3. Step 3: The driven shaft 8 is fixed on the positioning plate 7 by the third bearing 9. The positioning plate 7 has a guide hole for the positioning pin 14 at the corresponding position of the positioning seat 3. Step 4: The convex shaft 10 and the concave shaft 11 are fixed to the driven shaft 8 and the turbine shaft 1 respectively by the shouldered hexagonal nut 13.

[0037] Step 5: After assembling the above components, place the convex forming shaft 10 and the concave forming shaft 11 facing upwards in the vise clamping area; Step 6: The guide tube is fitted onto the convex shaft 10 from top to bottom, and clamped with a vise to form a local convexity; Step 7: Drive the multi-handle nut 15 to gradually roll the guide tube through the convex forming shaft 10 and the concave forming shaft 11 to complete the forming.

Claims

1. A device for corrugating the tip of a thin conduit, characterized in that, The components include a turbine shaft (1), a worm shaft (2), a positioning seat (3), a support plate (4), a first bearing (5), a second bearing (6), a positioning plate (7), a driven shaft (8), a third bearing (9), a convex shaft (10), a concave shaft (11), a shouldered hexagonal nut (12), an internal hexagonal screw (13), a positioning pin (14), and a multi-handle nut (15), wherein: The turbine shaft (1) is installed vertically, and from top to bottom it consists of a threaded section, a shaft positioning section, an upper bearing connection section, a turbine section, and a lower bearing connection section. The worm shaft (2) is installed horizontally, and from left to right there are left bearing connecting section, worm section, right bearing connecting section and thread section; The turbine section in the turbine shaft (1) meshes with the worm section in the worm shaft (2); The lower bearing connecting section of the turbine shaft (1) is connected to the positioning seat (3) through the first bearing (5), the left bearing connecting section and the right bearing connecting section of the worm shaft (2) are connected to the positioning seat (3) through the second bearing (6), and the upper part of the turbine shaft (1) is connected to the support plate (4) through the first bearing (5).

2. The thin-walled conduit tip corrugating device according to claim 1, characterized in that, The positioning plate (7) is laterally positioned with the positioning seat (3) by the positioning pin (14), and a two-way stepped through hole is vertically made, through which the driven shaft (8) passes. The driven shaft (8) has a threaded section, a shaft positioning section, an upper bearing connection section, a transition section, and a lower bearing connection section from top to bottom; the upper bearing connection section and the lower bearing connection section of the driven shaft (8) are connected to the positioning plate (7) through a third bearing (9); The turbine shaft (1) is fitted with the concave shaft (11) with clearance, and the driven shaft (8) is fitted with the convex shaft (10) with clearance. Both are locked with shouldered hexagonal nuts (12).

3. The thin-walled conduit tip corrugating device according to claim 2, characterized in that, The convex forming shaft (10) is a hollow rotating body structure. The upper part is an outer cylindrical surface smaller than the inner diameter of the conduit. The middle part of the outer cylindrical surface has an annular protrusion. The height of the annular protrusion is greater than the height of the rolling wave at the end of the conduit to be formed. The lower part is a limiting outer protrusion cylindrical surface, which is used to ensure the height of the rolling wave position at the end of the conduit. The concave forming shaft (11) is a hollow rotating body structure. Its upper part is a cylindrical surface, and there is a semi-circular groove at the height corresponding to the annular protrusion of the convex forming shaft (10). Its lower part is a reduced-diameter cylindrical surface to avoid interference with the cylindrical surface of the limiting outer boss of the convex forming shaft (10). The support plate (4) is fixed to the positioning seat (3) by internal hex screws (13); The multi-handle nut (15) is fixed to the threaded section of the worm shaft (2), driving the mechanism to rotate and achieve roll forming; The rotation center hole of the convex shaft (10) and the shaft positioning section of the driven shaft (8) are in clearance fit.

4. The thin-walled conduit tip corrugating device according to claim 2, characterized in that, The rotation center hole of the concave shaft (11) and the shaft positioning section of the turbine shaft (1) are clearance fit.

5. The thin-walled conduit tip corrugating device according to claim 2, characterized in that, The radius of the annular protrusion section of the convex forming shaft (10) is R4mm; the distance from the highest point of the annular protrusion of the convex forming shaft (10) to the outer cylindrical surface L of the convex forming shaft (10) is 3mm.

6. The thin-walled conduit tip corrugating apparatus according to claim 2, characterized in that, The distance H from the highest point of the annular protrusion of the convex forming shaft (10) to the cylindrical surface of the outer boss of the convex forming shaft (10) is required to be 5.5±0.2mm.

7. The thin-walled conduit tip corrugating apparatus according to claim 2, characterized in that, The mounting hole of the first bearing (5) on the positioning seat (3) and the mounting hole of the first bearing (5) on the support plate (4) are required to have a coaxiality of ≤0.1mm.

8. The thin-walled conduit tip corrugating device according to claim 2, characterized in that, The coaxiality of the two mounting holes of the second bearing (6) on the positioning seat (3) is required to be ≤0.1mm.

9. The thin-walled conduit tip corrugating device according to claim 2, characterized in that, The coaxiality of the two mounting holes of the third bearing (9) on the positioning plate (7) is required to be ≤0.1mm.

10. The thin-walled conduit tip corrugating device according to claim 2, characterized in that, The positioning pin (14) and the hole on the positioning seat (3) are interference fit, and the positioning pin (14) and the hole on the positioning plate (7) are clearance fit.

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