Auxiliary device for sintering PTFE (Polytetrafluoroethylene) pipe

Abstract

The utility model discloses an auxiliary device for sintering a PTFE (Polytetrafluoroethylene) tube, belongs to the technical field of PTFE tube sintering, and solves the problem that demolding is difficult for a tubular prefabricated part obtained after pressing. Comprising a bottom plate and a limiting pipe arranged on the bottom plate, the peripheral wall of the limiting pipe is fixedly connected with a feeding port communicating with the interior of the limiting pipe, and the interiors of the two ends of the limiting pipe are slidably connected with a first annular push plate and a second annular push plate correspondingly; and a limiting push rod capable of horizontally displacing is arranged between the annular push plate I and the annular push plate II in a penetrating manner. The polytetrafluoroethylene tubular prefabricated part is prepared in an efficient extrusion mode, firstly, tetrafluoroethylene powder is filled into the limiting pipe through the feeding port, then the built-in annular push plate is pushed to press the powder to form the prefabricated part, and after pressing, the formed prefabricated part is released to the open groove and the sliding way to be received, so that the efficiency is high, demolding is simple, and the production cost is low. And the damage risk is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of PTFE tube sintering, in particular to a PTFE tube sintering processing auxiliary device. Background Art

[0002] The PTFE tube sintering process usually involves first extruding polytetrafluoroethylene powder into a tubular preform. This preform is then placed in a sintering furnace and heated under precisely controlled temperature and time conditions. At the beginning of sintering, the temperature is gradually raised to near the crystalline melting point of PTFE, causing the powder particles to bond and begin to form a continuous solid structure. After sintering to a certain temperature, it is necessary to maintain a constant temperature to ensure that the material has a consistent structure inside and on the surface. The entire sintering process needs to be carefully monitored to avoid the temperature exceeding the optimal sintering point and causing decomposition. Finally, after sintering is completed, the temperature should be slowly lowered to prevent cracks or deformation during the cooling process. After cooling to room temperature, the PTFE tube is formed and can be processed or used subsequently. The entire sintering step is a key process to ensure that the PTFE tube has excellent mechanical properties and chemical stability.

[0003] For the entire PTFE tube sintering, the first step, forming a tubular preform by extruding polytetrafluoroethylene powder, is very important. In the prior art, the polytetrafluoroethylene powder is placed in a mold and the tubular preform is obtained by pressing. However, demolding is a more difficult problem for the tubular preform after pressing. If a large force is applied to the tubular preform, it will cause the problem of its breakage. Therefore, it is difficult to perform the pressing work while taking into account both efficiency and product integrity.

[0004] Therefore, a PTFE tube sintering processing auxiliary device is proposed to solve or alleviate the above problems. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and provides a PTFE tube sintering processing auxiliary device.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The PTFE tube sintering processing auxiliary device includes a base plate and a limiting tube arranged on the base plate. A feed port connected to the interior of the limiting tube is fixedly connected to the outer peripheral wall of the limiting tube. An annular push plate 1 and an annular push plate 2 are slidably connected to the two ends of the limiting tube respectively. A limiting push rod that can be horizontally displaced is passed through the middle of the annular push plate 1 and the annular push plate 2.

[0008] Preferably, a double pressurizing component is fixedly connected to the bottom plate to drive the annular push plate 1 and the limiting push rod to move respectively.

[0009] Preferably, the dual pressurization assembly includes a cylinder, a partition annular plate fixedly connected to the cylinder, an extension tube fixedly connected to the partition annular plate and arranged toward the cylinder opening, and an annular sealing plate fixedly connected between the cylinder opening and the extension tube. A primary hydraulic space is formed between the bottom surface of the cylinder and the partition annular plate, and a secondary hydraulic space is formed between the partition annular plate and the annular sealing plate. The primary hydraulic space and the secondary hydraulic space are respectively connected with liquid pipe 1 and liquid pipe 2. A piston block is slidably connected in the primary hydraulic space, and the piston block is fixedly connected to one end of a limiting push rod, and the limiting push rod passes through the extension tube to the outside. An annular piston is slidably connected in the secondary hydraulic space, and the annular piston is fixedly connected to push rod 1, and push rod 1 passes through the annular sealing plate and is fixedly connected to annular push plate 1.

[0010] Preferably, a pressurizing component for driving the annular push plate to move is fixedly connected to the bottom plate.

[0011] Preferably, the pressurizing assembly comprises a hydraulic cylinder and a second push rod fixedly connected to the piston rod of the hydraulic cylinder, and one end of the second push rod away from the hydraulic cylinder is fixedly connected to a second annular push plate.

[0012] Preferably, the bottom plate is provided with an open groove located below one end of the limiting tube.

[0013] Preferably, the bottom plate located at the opening groove is fixedly connected to a slideway located below the opening groove, and baffles are fixedly connected between two sides of the slideway and the bottom surface of the bottom plate.

[0014] The utility model has the following beneficial effects:

[0015] The utility model processes polytetrafluoroethylene powder into a tubular preform. First, the polytetrafluoroethylene powder enters the interior of a limiting tube through a feed port. At this time, a limiting push rod is placed in the limiting tube, and both ends are closed by an annular push plate 1 and an annular push plate 2. After the limiting tube is filled with powder, liquid is injected through a liquid pipe 2 to increase the hydraulic pressure in the secondary pressurization space, start the annular piston to move, and at the same time, the hydraulic cylinder is actuated. In this way, the push rod 1 and the push rod 2 drive the annular push plate in a bidirectional manner, compactly compress the polytetrafluoroethylene powder, and quickly form a tubular preform.

[0016] After the preform is formed, the hydraulic cylinder pulls the push rod 2 to retract. At the same time, the liquid pipe 1 absorbs the liquid in the pressurized space to make the limit push rod move in the opposite direction. In addition, the liquid pipe 2 continues to supply liquid. Under the action of the annular piston, the push rod 1 drives the annular push plate 1 and the limit push rod to move relative to each other, which makes the formed preform smoothly detach from the limit tube and fall into the slide through the opened opening groove. The baffle prevents it from falling out. The completed preform then slides out of the slide for recovery.

[0017] After the whole process is completed, it returns to its original state to prepare for the next round of pressing, improving production efficiency while reducing the difficulty and probability of breakage in the demolding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 It is a cross-sectional view of the utility model;

[0020] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0021] Figure 4 for Figure 2 Enlarged view of point B in the middle.

[0022] 1. Bottom plate; 2. Cylinder; 201. Separating annular plate; 202. Extension tube; 203. Annular sealing plate; 204. Piston block; 205. Limit push rod; 206. Liquid pipe 1; 207. Push rod 1; 208. Annular piston; 209. Liquid pipe 2; 3. Limit tube; 301. Annular push plate 1; 302. Annular push plate 2; 303. Feed port; 4. Hydraulic cylinder; 401. Push rod 2; 5. Opening groove; 501. Slide; 502. Baffle. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] PTFE tube sintering processing auxiliary device, such as Figure 1 and 2 As shown, it includes a bottom plate 1 and a limiting tube 3 arranged on the bottom plate 1, an open groove 5 located below one end of the limiting tube 3 is opened on the bottom plate 1, and a slideway 501 located below the open groove 5 is fixedly connected to the bottom plate 1 at the open groove 5, and baffles 502 are fixedly connected between the two sides of the slideway 501 and the bottom surface of the bottom plate 1, as shown in FIG. Figure 4 As shown, a feed port 303 communicating with the interior of the limiting tube 3 is fixedly connected to the outer wall thereof, and an annular push plate 1 301 and an annular push plate 2 302 are slidably connected to the two ends of the limiting tube 3 respectively, and a limiting push rod 205 which can be horizontally displaced is commonly provided between the annular push plates 1 301 and 302.

[0025] like Figure 3As shown, a double pressurizing assembly for driving an annular push plate 301 and a limit push rod 205 to move respectively is fixedly connected to the bottom plate 1, and the double pressurizing assembly includes a cylinder 2, a partition annular plate 201 fixedly connected to the cylinder 2, an extension tube 202 fixedly connected to the partition annular plate 201 and arranged toward the opening of the cylinder 2, and an annular sealing plate 203 fixedly connected between the opening of the cylinder 2 and the extension tube 202. A primary hydraulic space is formed between the inner bottom surface of the cylinder 2 and the partition annular plate 201, and a secondary hydraulic space is formed between the partition annular plate 201 and the annular sealing plate 203. The primary hydraulic space The intermediate and secondary hydraulic spaces are respectively connected with a liquid pipe 1 206 and a liquid pipe 209. Both the liquid pipe 1 206 and the liquid pipe 209 are used to connect an oil pump for pumping in or sucking hydraulic oil. A piston block 204 is slidably connected in the primary hydraulic space. The piston block 204 is fixedly connected to one end of a limit push rod 205, and the limit push rod 205 passes through the extension tube 202 to the outside. An annular piston 208 is slidably connected in the secondary hydraulic space. The annular piston 208 is fixedly connected with a push rod 1 207. The push rod 1 207 passes through the annular sealing plate 203 and is fixedly connected to an annular push plate 1 301.

[0026] A pressurizing component is fixedly connected to the bottom plate to drive the annular push plate 302 to move. The pressurizing component includes a hydraulic cylinder 4 and a push rod 401 fixedly connected to the piston rod of the hydraulic cylinder 4. The end of the push rod 401 away from the hydraulic cylinder 4 is fixedly connected to the annular push plate 302.

[0027] When the utility model needs to form a tubular preform by extruding polytetrafluoroethylene powder, the polytetrafluoroethylene powder is firstly put into the limiting tube 3 through the feed port 303. At this time, the limiting push rod 205 is located in the limiting tube 3 and passes through the annular push plate 1 301 and the annular push plate 2 302. At the same time, the annular push plate 1 301 and the annular push plate 2 302 respectively seal the two ends of the limiting tube 3. After the polytetrafluoroethylene powder fills the limiting tube 3, the liquid pipe 2 209 starts to enter the liquid, so that the liquid in the secondary pressurization space The hydraulic pressure increases, pushing the annular piston 208 to move, and the hydraulic cylinder 4 also starts to work, so that the push rod 1 207 and the push rod 2 401 can push the annular push plate 1 301 and the annular push rod 2 401 from two directions, so that the two can press the tetrafluoroethylene powder located in the limiting tube 3, so as to accelerate the formation of the tubular preform, and after the pressing is successful, the hydraulic cylinder 4 drives the push rod 2 401 to retract, so that the push rod 2 401 drives the annular push plate 2 302 to leave the limiting tube 3 , and the liquid pipe 1 206 sucks the liquid in the primary pressurized space, so that the limiting push rod 205 can be reversely displaced to a certain extent. At the same time, the liquid pipe 209 continues to pump liquid, so that the annular piston 208 can further drive the push rod 1 207 and the annular push plate 1 301 to move, so that the annular push plate 1 301 and the limiting push rod 205 can be relatively displaced, so that the annular push plate 1 301 can push the successfully pressed tubular preform away from the limiting pipe 3. 205 can also be separated from the inner ring of the tubular preform. Finally, after the tubular preform leaves the limiting tube 3, it falls from the opening groove 5 to the slide 501. Under the cover of the baffle 502, it is prevented from falling out from both sides of the slide 501, and finally leaves the slide 501 for recovery. During this process, the double pressurizing component and the pressurizing component are restored to their original state, waiting for the next pressing. This greatly improves the production efficiency of the tubular preform and reduces the difficulty of demoulding, making it less likely to be damaged due to demoulding.

[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. PTFE tube sintering processing auxiliary device, characterized in that: The invention comprises a bottom plate (1) and a limiting tube (3) arranged on the bottom plate (1); a feed port (303) which is in communication with the interior of the limiting tube (3) is fixedly connected to the outer peripheral wall of the limiting tube (3); an annular push plate 1 (301) and an annular push plate 2 (302) are slidably connected to the two ends of the limiting tube (3); a limiting push rod (205) which can be horizontally displaced is commonly passed through the middle of the annular push plate 1 (301) and the annular push plate 2 (302).

2. The PTFE tube sintering processing auxiliary device according to claim 1, characterized in that: The bottom plate (1) is fixedly connected with a double pressurizing component for driving the annular push plate 1 (301) and the limiting push rod (205) to move respectively.

3. The PTFE tube sintering processing auxiliary device according to claim 2, characterized in that: The dual pressurizing assembly comprises a cylinder (2), a partition annular plate (201) fixedly connected to the cylinder (2), an extension tube (202) fixedly connected to the partition annular plate (201) and arranged toward the opening of the cylinder (2), and an annular sealing plate (203) fixedly connected between the opening of the cylinder (2) and the extension tube (202), a primary hydraulic space is formed between the inner bottom surface of the cylinder (2) and the partition annular plate (201), a secondary hydraulic space is formed between the partition annular plate (201) and the annular sealing plate (203), and the primary hydraulic space and the secondary hydraulic space are connected to each other. The pressure spaces are respectively connected with a liquid pipe 1 (206) and a liquid pipe 2 (209); a piston block (204) is slidably connected in the primary hydraulic space; the piston block (204) is fixedly connected to one end of a limit push rod (205), and the limit push rod (205) passes through an extension tube (202) to the outside; an annular piston (208) is slidably connected in the secondary hydraulic space; the annular piston (208) is fixedly connected with a push rod 1 (207); the push rod 1 (207) passes through an annular sealing plate (203) and is fixedly connected to an annular push plate 1 (301).

4. The PTFE tube sintering processing auxiliary device according to claim 1, characterized in that: The bottom plate is fixedly connected with a pressurizing assembly for driving the second annular push plate (302) to move.

5. The PTFE tube sintering processing auxiliary device according to claim 4, characterized in that: The pressurizing assembly comprises a hydraulic cylinder (4) and a second push rod (401) fixedly connected to the piston rod of the hydraulic cylinder (4); one end of the second push rod (401) away from the hydraulic cylinder (4) is fixedly connected to a second annular push plate (302).

6. The PTFE tube sintering processing auxiliary device according to claim 1, characterized in that: The bottom plate (1) is provided with an open groove (5) located below one end of the limiting tube (3).

7. The PTFE tube sintering processing auxiliary device according to claim 6, characterized in that: The bottom plate (1) located at the opening groove (5) is fixedly connected to a slideway (501) located below the opening groove (5), and baffles (502) are fixedly connected between the two sides of the slideway (501) and the bottom surface of the bottom plate (1).

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