PTFE (Polytetrafluoroethylene) high-precision extrusion straight pipe preparation system

Abstract

The utility model discloses a PTFE (Polytetrafluoroethylene) high-precision extrusion straight pipe preparation system, which comprises an extruder, an extruder, a straight pipe, a straight pipe and a straight pipe, the sintering furnace is used for carrying out high-temperature sintering operation on the PTFE raw material pipe; the cooling device is used for carrying out low-temperature cooling operation on the PTFE sintering pipe through a cooling medium; and the clamping traction device comprises a guide wheel and a controller, the PTFE sintering pipe is pulled and clamped through the guide wheel and the controller, and the size parameters of the PTFE sintering pipe are adjusted. According to the utility model, the PTFE sintered pipe is rapidly cooled through the pipe cooling device, so that residual heat and internal stress in the pipe are eliminated, and the dimensional deviation of the pipe in the subsequent shearing and coiling process is reduced; and the clamping traction device is matched, so that the interference of heat flow and shearing or coiling on the pipe is effectively reduced, and the dimensional accuracy and straightness are prevented from being influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of PTFE pipe extrusion, in particular to a PTFE high-precision extrusion straight pipe preparation system. Background Art

[0002] PTFE tube is a kind of tube made of polytetrafluoroethylene material, which has excellent heat resistance, electrical insulation, chemical stability and extremely low friction coefficient. In medical devices, PTFE tubes are often used as interventional surgical sheaths, catheter lining tubes, interventional device protection sleeves and other components. The structural design of interventional catheters in different application fields is different and has its own characteristics. The design in the field of vascular intervention is particularly complex: due to the limited size of human blood vessels, we have been constantly pursuing the limit of catheter wall size when designing medical devices, and have put forward higher processing requirements for the dimensional accuracy and appearance of the raw materials used in interventional catheters. In actual industrial production, PTFE tubes are generally processed by plunger extrusion molding, and then sintered into tubes by PTFE powder, and finally collected by reels or cut online. There is a lack of control over the dimensional accuracy and appearance of PTFE tubes.

[0003] In the current PTFE tube preparation technology, since the raw tube is sintered at high temperature in the furnace, the fired tube often has residual heat and residual stress. Therefore, after the tube is collected by a reel or directly cut, it often appears in a bent state, making the size and straightness of the tube unable to meet the standards, thereby affecting its use effect and safety in medical devices. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems and provide a PTFE high-precision extrusion straight tube preparation system.

[0005] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions, including:

[0006] An extruder, wherein the extruder is used to extrude the PTFE raw material into a PTFE raw tube;

[0007] A sintering furnace, wherein the sintering furnace is used to perform high-temperature sintering operation on the PTFE raw material tube;

[0008] A cooling device, wherein the cooling device performs a low-temperature cooling operation on the PTFE sintered tube through a cooling medium;

[0009] A clamping and traction device comprises a guide wheel and a controller, and the guide wheel and the controller are used to pull and clamp the PTFE sintered tube to adjust the size parameters of the PTFE sintered tube.

[0010] As a further description of the above technical solution, the diameter of the PTFE sintered tube is 10-200 mm, and the wall thickness of the PTFE sintered tube is 1-10 mm.

[0011] As a further description of the above technical solution, the PTFE raw material tube is naturally suspended from the extruder and then vertically passes through the sintering furnace to form the PTFE sintered tube.

[0012] As a further description of the above technical solution, the PTFE sintering tube is naturally suspended from the sintering furnace and then vertically passes through the cooling device, and the cooling device is used to eliminate residual heat inside the PTFE sintering tube.

[0013] As a further description of the above technical solution, a coolant inlet is arranged at the top of one side of the cooling device, and a coolant outlet is arranged at the bottom of the other side of the cooling device.

[0014] As a further description of the above technical solution, the cooling medium enters the cooling cavity of the cooling device through the coolant inlet and circulates and then flows out from the coolant outlet to complete the cooling operation of the PTFE sintered tube.

[0015] As a further description of the above technical solution, the PTFE sintered tube is naturally suspended from the cooling device and then vertically passes through the guide wheel, and the guide wheel is used to clamp the PTFE sintered tube.

[0016] As a further description of the above technical solution, the PTFE sintered tube is naturally suspended from the guide wheel and then vertically passes through a shearing device or a curling device, wherein the shearing device is used for shearing and packaging, and the curling device is used for winding and packaging.

[0017] As a further description of the above technical solution, at least one group of guide wheels is provided, and the guide wheels rotate towards each other to adjust the concentricity, straightness and dimensional tolerance of the PTFE sintered tube.

[0018] As a further description of the above technical solution, the controller is provided with a speed regulator and a spacing regulator, the speed regulator is used to control the rotation speed of the guide wheel, and the spacing regulator is used to control the rotation spacing of the guide wheel.

[0019] The beneficial effects of the utility model are as follows:

[0020] 1. The utility model uses a tube cooling device to quickly cool the PTFE sintered tube, eliminates residual heat and internal stress in the tube, and reduces the dimensional deviation during the subsequent shearing and coiling of the tube; cooperates with the clamping and traction device to effectively reduce the interference of heat flow and shearing or coiling on the tube, and prevents the dimensional accuracy and straightness from being affected;

[0021] 2. In the utility model, a coolant inlet and a coolant outlet are arranged on both sides of the cooling device, and cooling by circulating cooling in the circulation cavity through cooling media such as ice water, dry ice, liquid nitrogen, etc., effectively eliminates residual heat and internal stress in the pipe;

[0022] 3. In the utility model, the clamping and traction device includes a guide wheel and a controller. The pipe is pulled, clamped and fixed by the guide wheel. The rotation speed and clamping distance of the guide wheel are adjusted by the controller to prevent the pipe from being disturbed by force in a suspended state, thereby effectively improving the dimensional accuracy of the pipe.

[0023] In order to more clearly illustrate the structural features and functions of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the preparation system of the utility model.

[0025] Reference numerals:

[0026] 1. Extruder; 2. PTFE raw material tube; 3. Sintering furnace; 4. PTFE sintering tube; 5. Cooling device; 6. Coolant inlet; 7. Coolant outlet; 8. Guide wheel; 9. Controller; 10. Speed ​​regulator; 11. Spacing regulator. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0028] like Figure 1 As shown, in one embodiment, a PTFE high-precision extruded straight tube preparation system includes: an extruder 1, a sintering furnace 3, a cooling device 5 and a clamping and traction device.

[0029] Among them, the extruder 1 is used to form a PTFE raw material tube 2 through an extrusion process on the PTFE raw material; the sintering furnace 3 is used to perform high-temperature sintering operation on the PTFE raw material tube 2 to form a PTFE sintered tube 4; in order to reduce the residual heat and internal stress of the PTFE sintered tube 4, a cooling device 5 is required to perform low-temperature cooling treatment on the PTFE sintered tube 4 through a cooling medium; at the same time, the clamping and traction device plays the role of traction and clamping the PTFE sintered tube 4 to adjust the size parameters of the PTFE sintered tube 4.

[0030] Specifically, the diameter of the PTFE sintered tube 4 is 10-200 mm, and the wall thickness of the PTFE sintered tube 4 is 1-10 mm.

[0031] like Figure 1As shown, in this embodiment, a coolant inlet 6 is provided at the top of one side of the cooling device 5 , and a coolant outlet 7 is provided at the bottom of the other side of the cooling device 5 .

[0032] In specific operation, the cooling medium enters the cooling cavity of the cooling device 5 through the coolant inlet 6, and is discharged from the coolant outlet 7 after circulating, thereby effectively cooling the PTFE sintered tube 4. Specifically, the cooling medium includes ice water, dry ice / ethanol, liquid nitrogen, etc., which can quickly and effectively reduce the temperature of the PTFE sintered tube 4, help eliminate residual heat and internal stress, and ensure that the quality and performance of the tube meet the requirements.

[0033] like Figure 1 As shown, in this embodiment, the clamping and pulling device includes a guide wheel 8 and a controller 9. Among them, the guide wheel 8 is provided with at least one group, which rotates towards each other, and the concentricity, straightness and dimensional tolerance of the PTFE sintered tube 4 are adjusted to ensure the accurate size of the tube.

[0034] Furthermore, the controller 9 includes a speed regulator 10 and a distance regulator 11. The speed regulator 10 is used to control the rotation speed of the guide wheels 8, while the distance regulator 11 is used to adjust the rotation distance between the guide wheels 8.

[0035] Working principle:

[0036] (1) PTFE raw material is squeezed through an extruder 1 to form a PTFE raw material tube 2;

[0037] (2) The PTFE raw material tube 2 is naturally suspended from the extruder 1 and vertically passed through the sintering furnace 3 for sintering to form a PTFE sintered tube 4;

[0038] (3) The PTFE sintering tube 4 is naturally suspended from the sintering furnace 3 and vertically passes through the cooling device 5 to eliminate residual heat and internal stress;

[0039] (4) The PTFE sintered tube 4 is naturally suspended from the cooling device 5 and vertically passes through the guide wheel 8, and the tube is pulled, clamped and fixed by the guide wheel 8. The rotation speed and clamping distance of the guide wheel 8 are adjusted by the controller 9;

[0040] (5) The PTFE sintered tube 4 is naturally suspended from the guide wheel 8 and vertically passes through a shearing device or a curling device for shearing and packaging or winding and packaging.

[0041] Through the above technical solution, the dimensional accuracy of the processed pipe is significantly improved, and the wall thickness tolerance of the pipe is within ±0.002mm; the concentricity and straightness of the pipe reach more than 99%.

[0042] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A PTFE high-precision extrusion straight tube preparation system, characterized in that: include: An extruder (1), wherein the extruder (1) is used to extrude PTFE raw material into a PTFE raw material tube (2); A sintering furnace (3), wherein the sintering furnace (3) is used to perform a high-temperature sintering operation on the PTFE raw material tube (2); A cooling device (5), wherein the cooling device (5) performs a low-temperature cooling operation on the PTFE sintered tube (4) through a cooling medium; A clamping and traction device, the clamping and traction device comprising a guide wheel (8) and a controller (9), the guide wheel (8) and the controller (9) are used to pull and clamp the PTFE sintered tube (4) to adjust the size parameters of the PTFE sintered tube (4).

2. The PTFE high-precision extrusion straight tube preparation system according to claim 1, characterized in that: The diameter of the PTFE sintered tube (4) is 10-200 mm, and the wall thickness of the PTFE sintered tube (4) is 1-10 mm.

3. The PTFE high-precision extrusion straight tube preparation system according to claim 1, characterized in that: The PTFE raw material tube (2) is naturally suspended from the extruder (1) and then vertically passes through the sintering furnace (3) to form the PTFE sintered tube (4).

4. The PTFE high-precision extrusion straight tube preparation system according to claim 1, characterized in that: The PTFE sintering tube (4) is naturally suspended from the sintering furnace (3) and then vertically passes through the cooling device (5), and the cooling device (5) is used to eliminate residual heat inside the PTFE sintering tube (4).

5. The PTFE high-precision extrusion straight tube preparation system according to claim 1, characterized in that: A coolant inlet (6) is provided at the top of one side of the cooling device (5), and a coolant outlet (7) is provided at the bottom of the other side of the cooling device (5).

6. The PTFE high-precision extrusion straight tube preparation system according to claim 1, characterized in that: The cooling medium enters the cooling cavity of the cooling device (5) through the coolant inlet (6) and circulates before flowing out from the coolant outlet (7), thereby completing the cooling operation of the PTFE sintered tube (4).

7. The PTFE high-precision extrusion straight tube preparation system according to claim 1, characterized in that: The PTFE sintered tube (4) is naturally suspended from the cooling device (5) and then vertically passes through the guide wheel (8), and the guide wheel (8) is used to clamp the PTFE sintered tube.

8. The PTFE high-precision extrusion straight tube preparation system according to claim 1, characterized in that: The PTFE sintered tube (4) is naturally suspended from the guide wheel (8) and then vertically passes through a shearing device or a curling device. The shearing device is used for shearing and packaging, and the curling device is used for winding and packaging.

9. The PTFE high-precision extrusion straight tube preparation system according to claim 1, characterized in that: At least one group of guide wheels (8) is provided, and the guide wheels (8) rotate towards each other to adjust the concentricity, straightness and dimensional tolerance of the PTFE sintered tube (4).

10. The PTFE high-precision extrusion straight tube preparation system according to claim 1, characterized in that: The controller (9) is provided with a speed regulator (10) and a spacing regulator (11), wherein the speed regulator (10) is used to control the rotation speed of the guide wheel (8), and the spacing regulator (11) is used to control the rotation spacing of the guide wheel (8).

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