PTFE sheath preparation system

Abstract

The utility model discloses a polytetrafluoroethylene (PTFE) sheath tube preparation system, which comprises an extruder, a sintering furnace, a cooling device, a clamping traction device and a mould, a forming part is arranged outside the mould, and a tearing part is formed on a sheath tube through the mould. According to the utility model, the extrusion rate of PTFE raw materials is controlled through the extruder, then the sintering temperature of the sheath tube is controlled through the sintering furnace, the sheath tube is cooled through the cooling device, then the sheath tube is clamped and fixed through the clamping traction device, and during the period, forming is carried out through the forming part outside the discharging part of the mold, so that the tearing part capable of being torn is formed at the end part of the sheath tube; and the sheathing canal can be torn and drawn out after being used.

Description

TECHNICAL FIELD

[0001] The utility model relates to sheath processing equipment technical field, concretely relates to a PTFE sheath preparation system. BACKGROUND

[0002] The PTFE sheath is a kind of high-performance insulating material made of polytetrafluoroethylene (PTFE), with excellent chemical resistance, high temperature resistance and low friction coefficient.In medical devices, PTFE tube is often used as interventional operation sheath, catheter lining tube, interventional instrument protective sleeve and other components.

[0003] When doing more complex interventional treatment, when the sheath is used up and needs to be withdrawn from the body, there is a foreign body blocking the return path, or the sheath is internally provided with a catheter, and the sheath cannot be directly taken out from the body, so the sheath needs to have tearability.The existing tearable sheath is unstable in combination state, and is easily torn by slight external force during use, which can easily damage blood vessels and affect the actual use effect. UTILITY MODEL CONTENT

[0004] The utility model discloses a PTFE sheath preparation system to solve the above problems.

[0005] The utility model discloses a PTFE sheath preparation system to solve the above problems.

[0006] Extruder, the extruder is used to extrude PTFE raw material into sheath pipe;

[0007] Mold, the mold is externally provided with a forming part, and the sheath pipe is formed with a tearable part by the mold.

[0008] As a further description of the above technical scheme, the mold includes a feeding part, a locking part and a discharging part, and the locking part is connected with the feeding part and the discharging part on both sides.

[0009] As a further description of the above technical scheme, the forming part is arranged on the outer end surface of the discharging part, and at least one set of the forming part is symmetrically arranged.

[0010] As a further description of the above technical scheme, the length of the forming part is less than or equal to the thickness of the sheath pipe.

[0011] As a further description of the above technical scheme, it further includes a sintering furnace, the sintering furnace is connected with the outlet of the extruder, and the sintering furnace is used for high-temperature sintering operation to the sheath pipe.

[0012] As a further description of the above technical solutions, the cooling device is provided with a coolant inlet on one side top and a coolant outlet on the other side bottom.

[0013] As a further description of the above technical solutions, the cooling device is provided with a coolant inlet on one side top and a coolant outlet on the other side bottom.

[0014] As a further description of the above technical solutions, the cooling device is provided with a coolant inlet on one side top and a coolant outlet on the other side bottom.

[0015] As a further description of the above technical solutions, the cooling device is provided with a coolant inlet on one side top and a coolant outlet on the other side bottom.

[0016] As a further description of the above technical solutions, the cooling device is provided with a coolant inlet on one side top and a coolant outlet on the other side bottom.

[0017] The beneficial effects of the present application are as follows:

[0018] The present application controls the extrusion rate of PTFE raw materials through an extruder, then controls the sintering temperature of the sheath tube through a sintering furnace, then cools the sheath tube through a cooling device, then clamps and fixes the sheath tube through a clamping and pulling device, and forms a tearable tearable part at the end of the sheath tube through a forming part outside the discharge part of the mold during the process, so that the sheath tube can be torn and pulled out after use.

[0019] To more clearly illustrate the structural features and effects of the present application, the present application will be described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of the PTFE sheath tube preparation system of the present application;

[0021] Figure 2 is a structural schematic diagram of the mold in the PTFE sheath tube preparation system of the present application;

[0022] Figure 3 is Figure 2 is an enlarged schematic view of A-A in

[0023] Figure 4 is a structural schematic diagram of the sheath tube prepared by the PTFE sheath tube preparation system of the present application.

[0024] REFERENCE SIGNS:

[0025] 1, extruder; 2, mold; 21, forming part; 22, feeding part; 23, locking part; 24, discharging part; 3, sintering furnace; 4, cooling device; 41, coolant inlet; 42, coolant outlet; 5, clamping traction device; 51, guide wheel; 52, controller. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model.

[0027] As shown in the drawings, Figures 1-4 In one embodiment, a PTFE sheath preparation system includes an extruder 1, a sintering furnace 3, a cooling device 4, a clamping traction device 5 and a mold 2.

[0028] The extruder 1 is used to form a PTFE raw pipe from PTFE raw materials through an extrusion process. The sintering furnace 3 is used to perform a high-temperature sintering operation on the PTFE raw pipe to form a PTFE sintered pipe. In order to reduce the residual heat and internal stress of the PTFE sintered pipe, the cooling device 4 is used to continuously cool the PTFE sintered pipe at a low temperature through a cooling medium. Meanwhile, the clamping traction device 5 is used to clamp and pull the PTFE sintered pipe. During this process, the mold 2 is used to reduce the diameter of the sheath and form a tearable part.

[0029] It should be noted that before entering the extruder 1, the mixing ratio and aging time of the PTFE raw materials and the additives need to be controlled, so that the mixed paste raw materials can maintain a suitable basic pressure (if the pressure is too small, the raw materials cannot be extruded from the discharge pipe, and if the pressure is too large, the discharge pipe cannot withstand the pressure and an alarm will be generated). The additives are changed into a sheath under the action of high temperature in the sintering furnace 3. In the case of increasing the extrusion speed, the sheath quickly passes through the high-temperature section (so that the arrangement of the molecules is disordered, and the Van der Waals force between the molecules is weak). During this process, the extrusion speed and the traction speed of the material need to be controlled.

[0030] Please continue to refer to Figures 1-4 In this embodiment, the mold 2 includes a feeding part 22, a locking part 23 and a discharging part 24. The locking part 23 is connected to the feeding part 22 and the discharging part 24 on both sides, and the forming part 21 is arranged on the outer end face of the discharging part 24.

[0031] For example, the forming part 21 is symmetrically provided with at least one group, the forming part 21 can be triangular or elliptical, and the length of the forming part 21 is less than or equal to the thickness of the sheath, so that the sheath forms a tearable tearable part after passing through the forming part 21.

[0032] Please continue to refer to Figures 1-4In the embodiment, the sintering furnace 3 is connected with the outlet of the extruder 1, the cooling device 4 is connected with the outlet of the sintering furnace 3, and the clamping traction device 5 is connected with the outlet of the cooling device 4, so that the sintering, cooling and traction operations are completed at one time.

[0033] Exemplarily, the cooling device 4 is provided with a coolant inlet 41 at the top of one side and a coolant outlet 42 at the bottom of the other side. In the specific operation, the cooling medium enters the cooling cavity of the cooling device 4 through the coolant inlet 41, circulates and then is discharged from the coolant outlet 42, so as to effectively cool the sheath tube.

[0034] Further, the clamping traction device 5 comprises a guide wheel 51 and a controller 52. The guide wheel 51 is symmetrically provided with at least one set and rotates towards each other, so as to ensure the accurate size of the tube by adjusting the concentricity, straightness and dimensional tolerance of the sheath tube.

[0035] Processing process:

[0036] (1) The PTFE powder and the auxiliary agent are mixed according to a certain proportion, then are loaded into the paste extruder 1 after being pressed, and are pressed to form a PTFE raw tube, wherein the proportion of the auxiliary agent is 16-24%, the mixture is aged for 10-20 hours after being mixed, and the extrusion speed is 0-40 mm / min;

[0037] (2) The PTFE raw tube is vertically passed through the sintering furnace 3 from the extruder 1 to be sintered, so as to form a PTFE sintered tube, wherein the temperature of the sintering furnace 3 is controlled to be 250-500℃;

[0038] (3) The PTFE sintered tube 4 is naturally hung after being vertically passed through the sintering furnace 33, and then is vertically passed through the cooling device 45 to eliminate the residual heat and internal stress;

[0039] (4) The PTFE sintered tube 4 is naturally hung after being vertically passed through the cooling device 45, and then is vertically passed through the guide wheel 51, so as to be clamped and fixed by the guide wheel 51, and the rotation speed and clamping spacing of the guide wheel 51 are adjusted by the controller 52; wherein the traction speed is 0-30 m / min, the inner diameter of the sheath tube is 2.1-2.4 mm, the single-side wall thickness is 0.14-0.17 mm, and the tearable length is greater than 1 m.

[0040] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application 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 sheath preparation system characterized by, The utility model relates to a kind of PTFE sheath forming device, including: Extruder (1), the extruder (1) is used to extrude PTFE raw material into sheath tube; Mold (2), the mold (2) is externally provided with forming part (21), and the sheath tube is formed with tearable part by the mold (2).

2. The PTFE sheath preparation system of claim 1, wherein, The mold (2) includes feed part (22), locking part (23) and discharge part (24), and the locking part (23) is connected feed part (22) and discharge part (24) on both sides.

3. The PTFE sheath preparation system of claim 2, wherein, The forming part (21) is arranged on the outer end surface of the discharge part (24), and the forming part (21) is symmetrically provided with at least one set.

4. The PTFE sheath preparation system of claim 1, wherein, The length of the forming part (21) is less than or equal to the thickness of the sheath tube.

5. The PTFE sheath preparation system of claim 1, wherein, It also includes a sintering furnace (3), which is connected to the outlet of the extruder (1), and is used for high-temperature sintering operation of the sheath tube.

6. The PTFE sheath preparation system of claim 5, wherein, It also includes a cooling device (4), which is connected to the outlet of the sintering furnace (3), and is used for low-temperature cooling operation of the sheath tube.

7. The PTFE sheath preparation system of claim 6, wherein, One side of the cooling device (4) is provided with a coolant inlet (41) at the top, and the other side of the cooling device (4) is provided with a coolant outlet (42) at the bottom.

8. The PTFE sheath preparation system of claim 6, wherein, It also includes a clamping traction device (5), which is connected to the outlet of the cooling device (4), and is used for clamping and pulling the sheath tube.

9. The PTFE sheath preparation system of claim 8, wherein, The clamping traction device (5) includes a guide wheel (51) and a controller (52), and the controller (52) is electrically connected to the guide wheel (51).

10. The PTFE sheath preparation system of claim 9, wherein, The guide wheel (51) is symmetrically provided with at least one set, and the guide wheels (51) rotate towards each other.

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