PTFE pipe roundness control equipment

Abstract

The utility model discloses a PTFE pipe roundness control device which comprises a pipe extrusion device, an extrusion pipe is arranged in the pipe extrusion device, one end of the extrusion pipe is connected with an internal air inlet device, the outer side of the extrusion pipe is provided with an external negative pressure device, the internal air inlet device is used for introducing compressed air into the extrusion pipe, and the external negative pressure device is used for introducing compressed air into the extrusion pipe. And the external negative pressure device is used for forming negative pressure outside the extrusion pipe. According to the PTFE pipe roundness control equipment provided by the utility model, when the PTFE pipe is extruded and formed in the extrusion pipe, pressure is formed inside and outside the PTFE pipe through the internal air inlet device and the external negative pressure device, so that the roundness of the PTFE pipe is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to PTFE pipe manufacturing technical field, specifically relates to a kind of PTFE pipe roundness control equipment. BACKGROUND

[0002] PTFE thin-wall etching pipe is widely used in medical devices, especially in medical interventional catheter composite tube, because of the limited size of human blood vessels, the production and manufacturing requirements of catheter are also very high.

[0003] In prior art, PTFE thin-wall etching pipe is prone to form flat round or pipe wall adhesion during extrusion, which cannot guarantee the roundness of PTFE thin-wall etching pipe. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of PTFE pipe roundness control equipment, to solve the problem of not guaranteeing the roundness of PTFE thin-wall etching pipe in related technology.

[0005] Therefore, the utility model provides a kind of PTFE pipe roundness control equipment, comprising: pipe extrusion device, the pipe extrusion device is provided with extrusion pipe, one end of the extrusion pipe is connected with internal air inlet device, the outside of the extrusion pipe is provided with external negative pressure device, the internal air inlet device is used to pass into compressed gas in the inside of extrusion pipe, the external negative pressure device is used to form negative pressure in the outside of extrusion pipe.

[0006] Preferably, the internal air inlet device includes air inlet pipe, one end of the air inlet pipe is communicated with one end of the extrusion pipe.

[0007] Preferably, the internal air inlet device further includes gas generator, the air inlet pipe is communicated with the gas generator, and the gas generator is used to provide compressed air to the air inlet pipe.

[0008] Preferably, the external negative pressure device includes negative pressure container, and the negative pressure container is used to provide negative pressure for the extrusion pipe.

[0009] Preferably, the negative pressure container is behind the pipe extrusion device, and the extrusion pipe is in the negative pressure container.

[0010] Preferably, the negative pressure container is provided with air outlet pipe.

[0011] Preferably, the external negative pressure device further includes negative pressure controller, and the negative pressure controller is communicated with the air outlet pipe.

[0012] Preferably, the pipe extrusion device includes pipe extruder, and the pipe extruder is connected with the extrusion pipe.

[0013] Preferably, the pipe extrusion device further includes sintering furnace, and the extrusion pipe is in the sintering furnace.

[0014] Preferably, the diameter of the extrusion tube ranges from 0.5mm to 10mm.

[0015] Advantages:

[0016] 1. The utility model provides a kind of PTFE pipe roundness control equipment, when PTFE pipe extrusion forming is carried out in extrusion tube, pressure is formed in the inside and outside of PTFE pipe by internal air inlet device and external negative pressure device, to guarantee the roundness of PTFE pipe.The product roundness of PTFE pipe roundness control equipment in the utility model can be controlled to reach more than 98%. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the following embodiment or prior art description will be simply introduced, and obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0018] Figure 1 It is the structure diagram of embodiment 1 of a kind of PTFE pipe roundness control equipment provided by the utility model.

[0019] In the figure, 1-tube extruder;2-sintering furnace;3-extrusion tube;4-negative pressure container;5-gas generator;6-gas inlet pipe;7-negative pressure controller;8-gas outlet pipe. DETAILED DESCRIPTION

[0020] The content of the utility model can be more easily understood by referring to the following detailed description of preferred implementation method of the utility model and included embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs. When there is a conflict, the definition in the specification shall prevail.

[0021] Embodiment 1:

[0022] A kind of PTFE pipe roundness control equipment as shown in Figure 1 Provided is a kind of PTFE pipe roundness control equipment, including: pipe extrusion device, pipe extrusion device is provided with extrusion tube 3, one end of extrusion tube 3 is connected with internal air inlet device, the outside of extrusion tube 3 is provided with external negative pressure device, internal air inlet device is used to pass into compressed gas in the inside of extrusion tube 3, external negative pressure device is used to form negative pressure in the outside of extrusion tube 3.

[0023] Pipe extrusion device includes tube extruder 1 and sintering furnace 2, tube extruder 1 is connected with extrusion tube 3, extrusion tube 3 is in sintering furnace 2.

[0024] The internal air feeding device comprises an air feeding pipe 6 and an air generator 5. One end of the air feeding pipe 6 is communicated with one end of the extrusion pipe 3. The air feeding pipe is communicated with the air generator 5, which is used to provide compressed air to the air feeding pipe.

[0025] The pipe extruder 1 extrudes the PTFE pipe into a pipe shape through the annular extrusion head into the extrusion pipe 3. The air feeding pipe 6 passes through the center of the annular extrusion head to input compressed air into the formed PTFE pipe to support the PTFE pipe and ensure the roundness of the PTFE pipe.

[0026] The external negative pressure device comprises a negative pressure container 4, an air outlet pipe 8 and a negative pressure controller 7. The negative pressure container 4 is used to provide negative pressure for the extrusion pipe 3. The negative pressure container 4 is behind the pipe extrusion device, and the extrusion pipe 3 is in the negative pressure container 4. The air outlet pipe 8 is arranged on the negative pressure container 4. The negative pressure controller 7 is communicated with the air outlet pipe 8. The negative pressure controller 7 extracts gas from the negative pressure container 4 through the air outlet pipe 8 to form negative pressure in the negative pressure container 4 and form pressure on the extrusion pipe 3 to ensure the roundness of the PTFE pipe.

[0027] The diameter of the extrusion pipe 3 ranges from 0.5 mm to 10 mm. The size of the PTFE pipe obtained through the extrusion pipe 3 is 0.5-10 mm in inner diameter and 0.015-0.1 mm in single side wall thickness. The roundness of the obtained PTFE pipe can reach more than 98%.

[0028] Working principle: The pipe extruder 1 extrudes the raw material into a pipe shape into the extrusion pipe 3, and then into the sintering furnace 2 for high temperature sintering. At the same time, the air generator 5 generates compressed gas, which is input into the extrusion pipe 3 through the air feeding pipe 6. After the PTFE pipe comes out of the sintering furnace 2, it enters the negative pressure container 4. The negative pressure controller 7 extracts gas from the negative pressure container 4 to generate negative pressure to ensure the roundness of the PTFE pipe.

[0029] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features. The modification or replacement does not make the essence of the corresponding technical solution deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A PTFE tube roundness control apparatus characterized by comprising: The application relates to a pipe extruding device, which comprises an extruding pipe, an internal air inlet device connected to one end of the extruding pipe, and an external negative pressure device arranged outside the extruding pipe. The internal air inlet device comprises an air inlet pipe, one end of which is communicated with one end of the extruding pipe.

2. The PTFE tube roundness control apparatus according to claim 1, wherein The internal air inlet device further comprises an air generator, the air inlet pipe being communicated with the air generator, and the air generator being used for providing compressed air to the air inlet pipe.

3. The PTFE tube roundness control apparatus according to claim 2, wherein The external negative pressure device comprises a negative pressure container, which is used for providing negative pressure to the extruding pipe.

4. The PTFE tube roundness control apparatus according to claim 1, wherein The negative pressure container is arranged behind the pipe extruding device, and the extruding pipe is arranged in the negative pressure container.

5. The PTFE tube roundness control apparatus according to claim 4, wherein An air outlet pipe is arranged on the negative pressure container.

6. A PTFE tube roundness control apparatus according to claim 5, wherein The external negative pressure device further comprises a negative pressure controller, which is communicated with the air outlet pipe.

7. A PTFE tube roundness control apparatus according to claim 6, wherein The pipe extruding device comprises a pipe extruding machine, which is connected with the extruding pipe.

8. The PTFE tube roundness control apparatus of claim 1, wherein The pipe extruding device further comprises a sintering furnace, and the extruding pipe is arranged in the sintering furnace.

9. The PTFE tube roundness control apparatus of claim 8, wherein The diameter of the extruding pipe ranges from 0.5 mm to 10 mm.

10. The PTFE tube roundness control apparatus of claim 1, wherein ​

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