Continuous extrusion device for double-color prefabricated pipe blank

Abstract

The invention discloses a continuous extrusion device for a double-color prefabricated pipe blank. The continuous extrusion device comprises an extrusion charging barrel, a special baffle, a feeding device, a thrust rod, an outer frame bracket, a bottom stop block and a bottom baffle, the outer wall of the bottom stop block is in sliding contact with the inner hole wall of the extrusion barrel, and the bottom of the extrusion barrel is connected with a bottom baffle; the top of the extrusion barrel is located in a bottom inner hole of the feeding device, the bottom inner hole wall of the feeding device is in sliding contact with the outer circular wall of the top of the extrusion barrel, a special baffle is arranged in the feeding device, and a baffle feeding section of the special baffle is in sliding contact with the feeding device. The baffle pre-pressing section of the special baffle is in sliding contact with the inner hole wall of the extrusion charging barrel, and the baffle forming section of the special baffle is in sliding contact with the inner hole wall of the bottom stop block. According to the device, mixed materials with different colors can be added into the device to be continuously extruded to prepare the double-color prefabricated pipe blank, the uniformity, uniformity and color uniformity of the extruded double-color prefabricated pipe blank are more excellent, the overall efficiency is high, and the rate of finished products is high.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a continuous extrusion device for a two-color preformed tube blank, that is, a continuous extrusion device for a two-color spiral preformed tube blank. Background Art

[0002] Polytetrafluoroethylene (PTFE) material has characteristics such as hydrophobicity, chemical stability, and low friction coefficient. The two-color film made of it is coated on the surface of the guide wire tube, which not only makes the guide wire tube have good lubricity and is convenient for moving in the human body cavity, but also can realize the two-color imaging function, facilitating doctors to observe the position and movement state of the guide wire tube during the operation.

[0003] In the prior art, the preparation of the PTFE two-color tube blank is a relatively cumbersome preparation process. First, the PTFE dispersion resin mixed with colored paste A is put into a semi-circular mold for preforming to obtain a semi-circular columnar blank of color A; the PTFE dispersion resin mixed with colored paste B is put into the same semi-circular mold for preforming to obtain a semi-circular columnar blank of color B; the semi-circular columnar blanks of color A and color B with the same size are surrounded and butted to obtain a two-color circular columnar tube blank, and then through a special feeding device, it is added into an extruder, and the uniform two-color preformed tube blank (also called two-color spiral preformed tube blank) is extruded through the extruder. The two-color preformed tube blank then undergoes some specific steps to become a two-color threaded tube. The above preparation method of the two-color preformed tube blank has a complex process, and there are also adverse factors such as uncontrollable impurities during the mold installation process and difficult mold disassembly and assembly, resulting in too low overall efficiency and low product yield. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a continuous extrusion device for a two-color preformed tube blank in view of the above-mentioned prior art deficiencies. This continuous extrusion device for a two-color preformed tube blank can add different-colored cured materials into the device and continuously extrude to prepare a PTFE two-color preformed tube blank. The neatness, uniformity, and color uniformity of the extruded two-color preformed tube blank are more excellent, with high overall efficiency and high product yield.

[0005] To achieve the above technical purpose, the technical solution adopted by the present invention is as follows:

[0006] A continuous extrusion device for a two-color preformed tube blank, comprising an extrusion barrel, a special baffle, a feeding device, a thrust rod, and an outer frame support;

[0007] The extrusion barrel is connected to the outer frame bracket. The top of the extrusion barrel is located in the bottom inner hole of the feeding device. The inner hole wall of the bottom of the feeding device is in sliding contact with the outer circular wall of the top of the extrusion barrel. The special baffle includes a baffle feeding section, a baffle pre-pressing section, and a baffle forming section that are connected in sequence. The baffle feeding section of the special baffle contacts the feeding device. The baffle pre-pressing section of the special baffle contacts the inner hole wall of the extrusion barrel. The baffle feeding section and the baffle pre-pressing section of the special baffle divide the cavity jointly formed by the feeding device and the extrusion barrel into a first feeding cavity and a second feeding cavity. The baffle forming section of the baffle forming section is located on the center line of the extrusion barrel. The center lines of the feeding device, the special baffle, and the extrusion barrel are all on the same straight line.

[0008] A slot is provided in the middle of the thrust rod along its length direction and penetrating one end thereof. The slot of the thrust rod can be in sliding contact with both the baffle feeding section and the baffle pre-pressing section of the special baffle, and the thrust rod can extend into the interior of the extrusion barrel. The outer wall of the thrust rod is in sliding contact with the inner hole wall of the extrusion barrel.

[0009] As a further improved technical solution of the present invention, it further includes a fixed flange. An installation through hole is provided on the outer frame bracket. After the extrusion barrel penetrates the installation through hole on the outer frame bracket, it is connected to the outer frame bracket through the fixed flange and locking screws.

[0010] As a further improved technical solution of the present invention, it further includes a bottom stop block and a bottom baffle. The bottom stop block is located inside the inner hole of the extrusion barrel, and the outer wall of the bottom stop block is in sliding contact with the inner hole wall of the extrusion barrel. A bottom baffle for limiting the bottom of the bottom stop block is connected to the bottom of the extrusion barrel. The baffle forming section of the special baffle is in sliding contact with the inner hole wall of the bottom stop block.

[0011] As a further improved technical solution of the present invention, the outer circular wall of the bottom stop block is in sliding and sealing contact with the inner hole wall of the extrusion barrel.

[0012] As a further improved technical solution of the present invention, two symmetric pin blind holes are provided on the outer circular wall at the bottom of the extrusion barrel. A pin is connected in each pin blind hole. The bottom baffle is suspended below the two pins for limiting the bottom of the bottom stop block.

[0013] As a further improved technical solution of the present invention, the inner hole wall of the bottom of the feeding device is in sliding and sealing contact with the outer wall of the top of the extrusion barrel.

[0014] As a further improved technical solution of the present invention, the feeding device includes a funnel-shaped feeding section and a barrel connection section. A strip-shaped placement groove is provided on the outer wall of the funnel-shaped feeding section. The baffle feeding section is wider at the top and narrower at the bottom, and the outer wall of the baffle feeding section is in sliding and sealing contact with the strip-shaped placement groove of the funnel feeding section. The bottom of the baffle feeding section is placed on the top of the extrusion barrel, and the baffle pre-pressing section extends into the inner hole of the extrusion barrel, and the baffle pre-pressing section is in sliding and sealing contact with the inner hole wall of the extrusion barrel.

[0015] As a further improved technical solution of the present invention, the outer wall of the baffle forming section of the special baffle is in sliding and sealing contact with the inner hole wall of the bottom block.

[0016] As a further improved technical solution of the present invention, the slot length of the thrust rod is greater than the total length of the baffle feeding section and the baffle pre-pressing section of the special baffle. The inner wall of the slot of the thrust rod can be in sliding and sealing contact with both the baffle feeding section and the baffle pre-pressing section of the special baffle, and the outer wall of the thrust rod is in sliding and sealing contact with the inner hole wall of the extrusion barrel.

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

[0018] The continuous extrusion device for the two-color prefabricated pipe blank of the present invention mainly consists of a feeding device, an extrusion barrel, a special baffle, a thrust rod, etc. Two kinds of polytetrafluoroethylene matured materials with different colors and the same weight are subjected to a downward thrust applied by the thrust rod, so that the polytetrafluoroethylene matured materials pass through the feeding section, pre-forming section, and forming section composed of the extrusion barrel, special baffle and feeding device, and directly obtain a two-color prefabricated pipe blank (i.e., a two-color spiral prefabricated pipe blank), that is, a PTFE blank pipe. There are no complicated mold disassembly and assembly steps in the whole process. Only by repeating the movement of the thrust rod and adding polytetrafluoroethylene matured materials with the same weight, can a two-color spiral prefabricated pipe blank that can be directly added to the extruder be continuously obtained. And this device can continuously extrude stably and reliably. Compared with the previous preparation device, the structure of this continuous extrusion device is novel and simple, and the preparation process of this continuous extrusion device is also simple and efficient, which can avoid mistakes in a large number of manual steps and greatly improve the operation efficiency. This continuous extrusion device adds different-color mixed materials into the device and can directly prepare a polytetrafluoroethylene two-color spiral pipe blank, that is, a two-color pipe blank, through continuous extrusion. The continuous extrusion device for the two-color prefabricated pipe blank can continuously extrude the two-color prefabricated pipe blank; the neatness, uniformity and color uniformity of the extruded two-color prefabricated pipe blank are more excellent. Description of the Drawings

[0019] Figure 1 It is a three-dimensional structure diagram of the continuous extrusion device of the present invention when it is prepared.

[0020] Figure 2 It is a schematic cross-sectional view of the structure of the continuous extrusion device of the present invention when it is prepared.

[0021] Figure 3 This is a structural plan view of a special baffle in the continuous extrusion device of the present invention.

[0022] Figure 4 This is a three-dimensional structural view of a special baffle in the continuous extrusion device of the present invention.

[0023] Figure 5 This is a three-dimensional structural view of a thrust rod in the continuous extrusion device of the present invention.

[0024] Figure 6 This is a three-dimensional structural view of a feeding device in the continuous extrusion device of the present invention.

[0025] Figure 7 This is a three-dimensional structural view of the continuous extrusion device of the present invention during operation.

[0026] Figure 8 This is a schematic cross-sectional view of the continuous extrusion device of the present invention during operation.

[0027] Figure 9 This is a schematic view of the material cavity of the continuous extrusion device of the present invention during operation. Detailed Embodiments

[0028] The following further describes the detailed embodiments of the present invention with reference to the accompanying drawings:

[0029] As Figure 1 shown, a continuous extrusion device for a two-color prefabricated pipe blank includes an extrusion barrel 4, a special baffle 3, a feeding device 2, a thrust rod 1, an outer frame support 6, a bottom block 7, and a bottom baffle 8.

[0030] As Figure 1-2 shown, the extrusion barrel 4 is connected to the outer frame support 6. The bottom block 7 is cylindrical, and the bottom block 7 is located in the cylindrical inner hole of the extrusion barrel 4 and the outer wall of the bottom block 7 is in sliding contact with the inner hole wall of the extrusion barrel 4. A bottom baffle 8 for limiting the bottom block 7 is connected to the bottom of the extrusion barrel 4. The top of the extrusion barrel 4 is located in the bottom inner hole of the feeding device 2, in contact with the step of the bottom inner hole of the feeding device 2, and the inner hole wall of the bottom of the feeding device 2 is in sliding contact with the outer circular wall of the top of the extrusion barrel 4. A special baffle 3 is provided inside the feeding device 2. The baffle feeding section 301 of the special baffle 3 is in sliding contact with the feeding device 2. The baffle pre-pressing section 302 of the special baffle 3 is in sliding contact with the inner hole wall of the extrusion barrel 4. The outer circular wall of the cylindrical baffle forming section 303 of the special baffle 3 is in sliding contact with the inner hole wall of the bottom block 7. The bottom of the baffle pre-pressing section 302 of the special baffle 3 is in contact with the top of the bottom block 7. The center lines of the feeding device 2, the special baffle 3, the extrusion barrel 4, and the bottom block 7 are all on the same straight line;

[0031] As Figure 5As shown, the outer shape of the thrust rod 1 is cylindrical. A slot 101 extending along its length and penetrating the bottom end is provided in the middle of the thrust rod 1. The inner wall of the slot 101 of the thrust rod 1 can be in sliding contact with the surfaces of the baffle feeding section 301 and the baffle pre-pressing section 302 of the special baffle 3. Moreover, the thrust rod 1 can extend into the interior of the extrusion barrel 4, and the outer cylindrical wall of the thrust rod 1 is in sliding contact with the inner hole wall of the extrusion barrel 4.

[0032] This embodiment further includes a fixed flange 5. There is an installation through hole provided on the outer frame bracket 6. After the extrusion barrel 4 penetrates through the installation through hole on the outer frame bracket 6, the connection groove 401 of the extrusion barrel 4 is connected to the outer frame bracket 6 through the fixed flange 5 and the locking screw 9.

[0033] In this embodiment, the outer cylindrical wall of the bottom block 7 is in sliding and sealing contact with the inner hole wall of the extrusion barrel 4. Specific sliding sealing method: The outer cylindrical wall of the bottom block 7 and the inner hole wall of the extrusion barrel 4 can be processed to be smoother to achieve sealed sliding contact.

[0034] In this embodiment, there are 2 symmetrical pin blind holes provided on the outer cylindrical wall at the bottom of the extrusion barrel 4. A pin 11 is connected in each pin blind hole. The pin 11 is made of metal material. The bottom baffle 8 is suspended below the two pins 11 and is used to limit the bottom of the bottom block 7 to prevent the bottom block 7 from falling.

[0035] In this embodiment, the inner hole wall at the bottom of the feeding device 2 is in sliding and sealing contact with the outer cylindrical wall at the top of the extrusion barrel 4.

[0036] In this embodiment, as Figure 3-4 shown, the special baffle 3 includes a baffle feeding section 301, a baffle pre-pressing section 302, and a baffle forming section 303 connected in sequence. The baffle feeding section 301 is wider at the top and narrower at the bottom. The baffle pre-pressing section 302 is rectangular in shape. The baffle forming section 303 is bar-shaped and cylindrical. As Figure 6 shown, the feeding device 2 includes a funnel-shaped feeding section 201 and a barrel connection section 202. A strip-shaped placement groove 203 is provided on the outer wall of the funnel-shaped feeding section 201. The baffle feeding section 301 is wider at the top and narrower at the bottom, and the outer edge wall of the baffle feeding section 301 is in sliding and sealing contact with the strip-shaped placement groove 203 of the funnel feeding section 201. The bottom of the baffle feeding section 301 is placed on the top of the extrusion barrel 4, and the baffle pre-pressing section 302 extends into the inner hole of the extrusion barrel 4. The baffle pre-pressing section 302 is in sliding and sealing contact with the inner hole wall of the extrusion barrel 4.

[0037] In this embodiment, the outer wall of the baffle forming section 303 of the special baffle 3 is in sliding and sealing contact with the inner hole wall of the bottom block 7.

[0038] In this embodiment, as Figure 5As shown, the length of the slot 101 of the thrust rod 1 is greater than the total length of the baffle feeding section 301 and the baffle pre-pressing section 302 of the special baffle 3. The inner wall of the slot 101 of the thrust rod 1 can be in sliding and sealing contact with both the baffle feeding section 301 and the baffle pre-pressing section 302 of the special baffle 3, and the outer wall of the thrust rod 1 is in sliding and sealing contact with the inner hole wall of the extrusion barrel 4.

[0039] The extrusion barrel 4 is a hollow cylindrical mold, and it is necessary to ensure that the inner wall of the hollow part is smooth. There is a connecting groove 401 on the outer wall for connecting and fixing the flange 5. There are symmetric pin blind holes at the lower part of the outer wall for installing pins 11 (metal pins) to ensure the connection strength of the bottom baffle 8. The top is connected to the bottom of the feeding device 2 to ensure that the center lines of the two components are on the same straight line. The special baffle 3 is a special hard thin metal part, which is divided into three sections, namely the baffle feeding section 301, the baffle pre-forming section 302, and the baffle forming section 303. The shapes and functions of each section are different. The baffle feeding section 301 is used to prevent the two-color cured materials from being mixed with each other. The baffle pre-forming section 302 is where the two different-color cured materials are respectively compressed in their respective material cavities (i.e., the material cavity one 12 and the material cavity two 13). The baffle forming section 303 is a solid cylinder where the two different-color cured materials are fused. The special baffle 3 is connected to the feeding device 2 to ensure that the center lines of the two components are on the same straight line. There is a sliding connection between the special baffle 3 and the extrusion barrel 4. Figure 1 Among them, after the special baffle 3 is placed in the feeding device 2, the bottom of the special baffle 3 is flush with the bottom of the extrusion barrel 4. The feeding device 2 is a flared feeding mold with a placement groove 203 in the center for placing the special baffle 3. The bottom of the feeding device 2 is in sliding connection with the extrusion barrel 4. The bottom block 7 is a hollow cylindrical block. The outer wall of the bottom block 7 is smooth and fits the inner wall of the extrusion barrel 4, and the inner wall of the bottom block 7 is also smooth and fits the outer wall of the baffle forming section 303 of the special baffle 3. The smoothness can achieve sealed sliding contact. The bottom baffle 8 is a metal bending part that cooperates with the pin 11 installed in the pin blind hole on the lower part of the outer wall of the extrusion barrel 4, mainly used to block the falling of the bottom block 7, so that the cured material inside the barrel can reach its due compressed volume and strength. The thrust rod 1 is a solid long cylindrical push rod with a hollow groove, mainly used to apply a downward thrust so that the cured material passes through three forming areas to form the double-color spiral prefabricated tube blank we need. The outer frame bracket 6 is a C-shaped mounting bracket with 4 threaded holes for connecting to the fixed flange 5 at the top and a mounting through hole for the extrusion barrel 4 to pass through, mainly used for fixing the extrusion barrel 4.

[0040] The preparatory work before preparation is that the whole set of parts is in accordance with Figure 1Assemble, ensuring that all the components mentioned below are clean, free of burrs. The outer frame support 6 contacts the workbench surface to raise the overall tooling for subsequent operations. The outer frame support 6 and the extrusion barrel 4 are positioned and installed through the fixed flange 5 and then fixed by the locking screw 9. The inner hole of the extrusion barrel 4 and the outer wall of the bottom block 7 are in sliding fit, and symmetric pin blind holes are left below the outer wall of the extrusion barrel 4 for installing the pins 11. Then, a special bottom baffle 8 is suspended below the two metal pins 11. The bottom baffle 8 is provided with a suspension groove for hanging below the two metal pins 11 to limit the bottom of the bottom block 7. The feeding device 2 and the extrusion barrel 4 are in sliding fit. The feeding device 2 is placed on the top of the extrusion barrel 4. Finally, a special baffle 3 is placed in the feeding device 2. The baffle feeding section 301 of the special baffle 3 is in sliding fit with the feeding device 2, the baffle pre-pressing section 302 of the special baffle 3 is in sliding fit with the inner wall of the extrusion barrel 4, and the baffle forming section 303 of the special baffle 3 is in sliding fit with the inner wall of the bottom block 7, ensuring that the center lines of the feeding device 2, the special baffle 3, the barrel 4, and the bottom block 7 are all on the same straight line. The assembled device is as shown in Figure 1 shown, and can be divided into two feeding chambers of the same size, namely feeding chamber one 12 and feeding chamber two 13 as shown in Figure 9 shown, by the special baffle 3 for standby. The schematic diagram of the material chamber during the operation of the assembled device is as shown in Figure 9 shown. The entire material chamber is divided into a feeding section, a preforming section, and a forming section.

[0041] Prepare N grams each of A and B color polytetrafluoroethylene cured materials of the same weight. The A and B color polytetrafluoroethylene cured materials are respectively added to the feeding chamber completed by assembly. Apply pressure downward through the push rod 1 to obtain 2 semi-circular pre-pressed blanks in the middle of the tooling. Remove the bottom baffle 8, lift the push rod 1, and add N grams each of A and B color polytetrafluoroethylene cured materials again. Apply pressure through the push rod 1. After the preformed blank is extruded and formed with the inner surface of the extrusion barrel 4 to fill the gap, slowly push out the bottom block 7 from the extrusion barrel 4 until the bottom block 7 is completely separated from the extrusion barrel 4. Repeat the above actions to obtain a continuous double-color circular columnar tube blank, that is, the double-color prefabricated tube blank 10 as shown in Figure 7-8 shown.

[0042] The continuous extrusion device for the double-color prefabricated tube blank of the present invention mainly consists of a feeding device 2, an extrusion barrel 4, a special baffle 3, a push rod 1, etc. Two polytetrafluoroethylene cured materials of different colors but the same weight, through the downward thrust applied by the push rod 1, make the polytetrafluoroethylene cured materials pass through as shown in Figure 9The feeding section, preforming section, and forming section composed of the shown extrusion barrel 4, special baffle 3, and feeding device 2 directly obtain a two-color preformed tube blank 10 (i.e., a two-color spiral preformed tube blank), which is a PTFE blank tube. There are no complex mold disassembly and assembly steps in the whole process. Only by repeatedly moving the thrust rod 1 and adding polytetrafluoroethylene matured materials with the same weight can a two-color spiral preformed tube blank that can be directly added to the extruder be continuously obtained. Moreover, this device can continuously extrude stably and reliably. Compared with the previous preparation devices, the structure of this continuous extrusion device is novel and simple, and the preparation process of this continuous extrusion device is also simple and efficient, which can not only avoid mistakes in a large number of manual steps but also greatly improve the operation efficiency.

[0043] The protection scope of the present invention includes but is not limited to the above embodiments. The protection scope of the present invention is subject to the claims. Any replacement, deformation, and improvement that are easily conceivable by those skilled in the art for this technology fall within the protection scope of the present invention.

Claims

1. Continuous extrusion device for two-color preformed pipe blanks, characterized in that: It includes an extrusion barrel (4), a special baffle (3), a feeding device (2), a thrust rod (1), and an outer frame support (6); The extrusion barrel (4) is connected to the outer frame support (6). The top of the extrusion barrel (4) is located in the bottom inner hole of the feeding device (2). The inner hole wall of the bottom of the feeding device (2) is in sliding contact with the outer circular wall of the top of the extrusion barrel (4). The special baffle (3) includes a baffle feeding section (301), a baffle pre-pressing section (302), and a baffle forming section (303) connected in sequence. The baffle feeding section (301) of the special baffle (3) is in contact with the feeding device (2). The baffle pre-pressing section (302) of the special baffle (3) is in contact with the inner hole wall of the extrusion barrel (4). The baffle feeding section (301) and the baffle pre-pressing section (302) of the special baffle (3) divide the cavity formed by the feeding device (2) and the extrusion barrel (4) into a first feeding cavity (12) and a second feeding cavity (13); The baffle forming section (303) of the baffle forming section (303) is located on the center line of the extrusion barrel (4). The center lines of the feeding device (2), the special baffle (3), and the extrusion barrel (4) are all on the same straight line; A slot (101) is provided in the middle of the thrust rod (1) along its length direction and penetrating one end thereof. The slot (101) of the thrust rod (1) can be in sliding contact with both the baffle feeding section (301) and the baffle pre-pressing section (302) of the special baffle (3), and the thrust rod (1) can extend into the interior of the extrusion barrel (4). The outer wall of the thrust rod (1) is in sliding contact with the inner hole wall of the extrusion barrel (4).

2. The continuous extrusion device for the two-color preformed tube blank according to claim 1, wherein: It also includes a fixed flange (5). An installation through hole is provided on the outer frame support (6). After the extrusion barrel (4) penetrates the installation through hole on the outer frame support (6), it is connected to the outer frame support (6) through the fixed flange (5) and a locking screw (9).

3. The continuous extrusion device for the two-color preformed pipe blank according to claim 1, characterized in that: It also includes a bottom stop (7) and a bottom baffle (8); The bottom stop (7) is located in the inner hole of the extrusion barrel (4) and the outer wall of the bottom stop (7) is in sliding contact with the inner hole wall of the extrusion barrel (4). The bottom of the extrusion barrel (4) is connected with a bottom baffle (8) for limiting the bottom stop (7); The baffle forming section (303) of the special baffle (3) is in sliding contact with the inner hole wall of the bottom stop (7).

4. The continuous extrusion device for a two-color prefabricated pipe blank according to claim 3, wherein: The outer circular wall of the bottom stop (7) is in sliding and sealing contact with the inner hole wall of the extrusion barrel (4).

5. The continuous extrusion device for the two-color preformed pipe blank according to claim 3, wherein: Two symmetric pin blind holes are provided on the outer circular wall at the bottom of the extrusion barrel (4). A pin (11) is connected in each pin blind hole. The bottom baffle (8) is suspended below the two pins (11) for limiting the bottom of the bottom stop (7).

6. The continuous extrusion device for the two-color prefabricated pipe blank according to claim 3, characterized in that: The feeding device (2) includes a funnel-shaped feeding section (201) and a barrel connection section (202). A strip-shaped placement groove (203) is formed in the outer wall of the funnel-shaped feeding section (201). The baffle feeding section (301) is wider at the top and narrower at the bottom, and the outer wall of the baffle feeding section (301) is in sliding and sealing contact with the strip-shaped placement groove (203) of the funnel feeding section (201). The bottom of the baffle feeding section (301) is placed on the top of the extrusion barrel (4), and the baffle preloading section (302) extends into the inner hole of the extrusion barrel (4), and the baffle preloading section (302) is in sliding and sealing contact with the inner hole wall of the extrusion barrel (4).

7. The continuous extrusion device for the two-color preformed tube blank according to claim 6, characterized in that: The outer wall of the baffle forming section (303) of the special baffle (3) is in sliding and sealing contact with the inner hole wall of the bottom block (7).

8. The continuous extrusion device for the two-color preformed pipe blank according to claim 1, wherein: The length of the slot (101) of the thrust rod (1) is greater than the total length of the baffle feeding section (301) and the baffle preloading section (302) of the special baffle (3). The inner wall of the slot (101) of the thrust rod (1) can be in sliding and sealing contact with both the baffle feeding section (301) and the baffle preloading section (302) of the special baffle (3), and the outer wall of the thrust rod (1) is in sliding and sealing contact with the inner hole wall of the extrusion barrel (4).

9. The continuous extrusion device for a two-color preformed tube blank according to claim 1, characterized in that: The inner hole wall at the bottom of the feeding device (2) is in sliding and sealing contact with the outer wall at the top of the extrusion barrel (4).

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