Continuous extrusion device for double-color prefabricated pipe blank

Abstract

The utility model discloses a continuous extrusion device for a double-color prefabricated pipe blank. The continuous extrusion device comprises an extrusion charging barrel, a special baffle plate, a feeding device, a thrust rod, an outer frame bracket, a bottom stop block and a bottom baffle plate, 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 utility model, mixed materials with different colors can be added into the device to prepare a double-color prefabricated pipe blank through continuous extrusion, the extruded double-color prefabricated pipe blank is more excellent in neatness, uniformity and color uniformity, the overall efficiency is high, and the rate of finished products is high.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically a continuous extrusion device for two-color preformed tube blanks, that is, a continuous extrusion device for two-color spiral preformed tube blanks. Background Technology

[0002] Polytetrafluoroethylene (PTFE) material has properties such as hydrophobicity, chemical stability and low coefficient of friction. When a two-color film made of PTFE is used to coat the surface of the guidewire, it not only gives the guidewire good lubrication and facilitates its movement in the human body cavity, but also enables two-color imaging, making it convenient for doctors to observe the position and movement of the guidewire during surgery.

[0003] The current process for preparing two-color PTFE tube blanks is relatively complex. First, PTFE dispersion resin mixed with color slurry A is placed in a semi-circular mold for preforming, resulting in a semi-circular cylindrical blank of color A. Then, PTFE dispersion resin mixed with color slurry B is placed in the same semi-circular mold for preforming, resulting in a semi-circular cylindrical blank of color B. The two-color cylindrical blanks of the same size (color A and color B) are joined together to form a two-color circular cylindrical tube blank. This blank is then fed into an extruder via a special feeding device and extruded to obtain a uniform two-color pre-formed tube blank (also called a two-color spiral pre-formed tube blank). The two-color pre-formed tube blank then undergoes specific steps to become a two-color threaded tube. This method of preparing two-color pre-formed tube blanks is complex, and the process is further hampered by uncontrollable impurities during mold installation and difficulties in mold assembly and disassembly, resulting in low overall efficiency and a low yield. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a continuous extrusion device for two-color preformed tube blanks to address the shortcomings of the prior art. This continuous extrusion device for two-color preformed tube blanks can produce polytetrafluoroethylene two-color preformed tube blanks by adding different colored curing materials into the device and continuously extruding them. The extruded two-color preformed tube blanks have better uniformity, evenness and color uniformity, higher overall efficiency and higher yield.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

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

[0007] The extrusion cylinder is connected to the outer frame support. The top of the extrusion cylinder is located in the 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 cylinder. The special baffle includes a baffle feeding section, a baffle pre-pressing section, and a baffle forming section connected in sequence. The baffle feeding section of the special baffle is in contact with the feeding device, and the baffle pre-pressing section of the special baffle is in contact with the inner hole wall of the extrusion cylinder. The baffle feeding section and the baffle pre-pressing section of the special baffle divide the cavity formed by the feeding device and the extrusion cylinder into feeding cavity one and feeding cavity two. The baffle forming section is located on the center line of the extrusion cylinder. The center lines of the feeding device, the special baffle, and the extrusion cylinder are all on the same straight line.

[0008] The push rod has a slot in the middle that extends along its length and passes through one end. The slot of the push rod can slide in contact with the feeding section and the pre-pressing section of the special baffle. The push rod can also extend into the interior of the extrusion cylinder, and the outer wall of the push rod slides in contact with the inner wall of the extrusion cylinder.

[0009] As a further improvement of this utility model, it also includes a fixed flange. The outer frame support is provided with an installation through hole. The extrusion cylinder passes through the installation through hole on the outer frame support and is connected to the outer frame support by the fixed flange and locking screws.

[0010] As a further improvement of the present invention, the invention also includes a bottom stop and a bottom baffle; the bottom stop is located inside the inner hole of the extrusion cylinder and the outer wall of the bottom stop slides in contact with the inner hole wall of the extrusion cylinder, and the bottom of the extrusion cylinder is connected to a bottom baffle for limiting the bottom stop; the baffle forming section of the specially made baffle slides in contact with the inner hole wall of the bottom stop.

[0011] As a further improvement of this utility model, the outer circular wall of the bottom stop block is in sliding sealing contact with the inner wall of the extrusion cylinder.

[0012] As a further improvement of the present invention, the outer circular wall at the bottom of the extrusion cylinder is provided with two symmetrical pin blind holes, each pin blind hole is connected to a pin, and the bottom baffle is suspended below the two pins to limit the bottom of the bottom stop.

[0013] As a further improvement of this utility model, the bottom inner wall of the feeding device is in sliding and sealing contact with the top outer wall of the extrusion cylinder.

[0014] As a further improvement of the present invention, the feeding device includes a funnel-shaped feeding section and a material cylinder connecting section. The outer wall of the funnel-shaped feeding section is provided with a strip-shaped placement groove. The baffle feeding section is wider at the top and narrower at the bottom, and the outer side wall of the baffle feeding section is in sliding and sealing contact with the strip-shaped placement groove of the funnel-shaped feeding section. The bottom of the baffle feeding section is placed at the top of the extrusion cylinder, and the baffle pre-pressing section extends into the inner hole of the extrusion cylinder, and the baffle pre-pressing section is in sliding and sealing contact with the inner hole wall of the extrusion cylinder.

[0015] As a further improvement of this utility model, the outer wall of the baffle forming section of the special baffle is in sliding sealing contact with the inner wall of the bottom block.

[0016] As a further improvement of this utility model, 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 slide and seal in 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 slides and seals in contact with the inner wall of the extrusion cylinder.

[0017] The beneficial effects of this utility model are as follows:

[0018] This utility model's continuous extrusion device for two-color preformed tube blanks mainly consists of a feeding device, an extrusion barrel, a special baffle, and a thrust rod. Two different colors of polytetrafluoroethylene (PTFE) curing materials of the same weight are pushed downwards by the thrust rod, causing the PTFE curing materials to pass through the feeding section, preforming section, and forming section, which consists of the extrusion barrel, special baffle, and feeding device, directly yielding a two-color preformed tube blank (i.e., a two-color spiral preformed tube blank), or PTFE blank tube. The entire process eliminates complex mold disassembly and assembly steps; simply moving the thrust rod and adding the same weight of PTFE curing materials repeatedly continuously yields two-color spiral preformed tube blanks that can be directly fed into the extruder. Furthermore, this device provides continuous, stable, and reliable extrusion. Compared to previous preparation devices, this continuous extrusion device has a novel and simple structure, and its preparation process is simple and efficient, avoiding errors from numerous manual steps and significantly improving operational efficiency. This continuous extrusion device can directly produce polytetrafluoroethylene (PTFE) two-color spiral tube blanks, i.e., two-color tube blanks, by adding mixtures of different colors into the device and continuously extruding them. This continuous extrusion device for two-color preforms can continuously extrude two-color preforms; the extruded two-color preforms have superior uniformity, evenness, and color uniformity. Attached Figure Description

[0019] Figure 1 A three-dimensional structural view of the continuous extrusion device of this utility model during preparation.

[0020] Figure 2 A cross-sectional view of the structure during preparation for the continuous extrusion device of this utility model.

[0021] Figure 3 This is a structural plan view of the specially designed baffle in the continuous extrusion device of this utility model.

[0022] Figure 4 This is a three-dimensional view of the specially designed baffle in the continuous extrusion device of this utility model.

[0023] Figure 5 This is a three-dimensional view of the thrust rod in the continuous extrusion device of this utility model.

[0024] Figure 6 This is a three-dimensional structural view of the feeding device in the continuous extrusion apparatus of this utility model.

[0025] Figure 7 This is a three-dimensional view of the continuous extrusion device of this utility model during operation.

[0026] Figure 8 This is a cross-sectional schematic diagram of the continuous extrusion device of this utility model during operation.

[0027] Figure 9 This is a schematic diagram of the material chamber during operation of the continuous extrusion device of this utility model. Detailed Implementation

[0028] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings:

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

[0030] like Figure 1-2 As shown, the extrusion cylinder 4 is connected to the outer frame support 6. The bottom stop 7 is cylindrical and located inside the cylindrical inner hole of the extrusion cylinder 4, with its outer wall in sliding contact with the inner wall of the extrusion cylinder 4. A bottom baffle 8 is connected to the bottom of the extrusion cylinder 4 to limit the movement of the bottom stop 7. The top of the extrusion cylinder 4 is located in the bottom inner hole of the feeding device 2, contacting the step of the bottom inner hole of the feeding device 2, and the bottom inner hole wall of the feeding device 2 slides against the top outer circular wall of the extrusion cylinder 4. The feeding device 2 is equipped with a special baffle 3. The feeding section 301 of the special baffle 3 is in sliding contact with the feeding device 2. The pre-pressing section 302 of the special baffle 3 is in sliding contact with the inner wall of the extrusion cylinder 4. The outer wall of the cylindrical baffle forming section 303 of the special baffle 3 is in sliding contact with the inner wall of the bottom block 7. The bottom of the 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 cylinder 4 and the bottom block 7 are all on the same straight line.

[0031] like Figure 5 As shown, the thrust rod 1 is cylindrical in shape, and 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 slide in contact with the surfaces of the baffle feeding section 301 and the baffle pre-pressing section 302 of the special baffle 3. The thrust rod 1 can extend into the interior of the extrusion cylinder 4, and the outer circular wall of the thrust rod 1 slides in contact with the inner wall of the extrusion cylinder 4.

[0032] This embodiment also includes a fixing flange 5. The outer frame bracket 6 is provided with an installation through hole. After the extrusion cylinder 4 passes through the installation through hole on the outer frame bracket 6, the connecting groove 401 of the extrusion cylinder 4 is connected to the outer frame bracket 6 through the fixing flange 5 and the locking screw 9.

[0033] In this embodiment, the outer circular wall of the bottom stop 7 slides and seals against the inner wall of the extrusion barrel 4. Specifically, the outer circular wall of the bottom stop 7 and the inner wall of the extrusion barrel 4 can be machined to be smoother to achieve a sealed sliding contact.

[0034] In this embodiment, the outer circular wall at the bottom of the extrusion cylinder 4 is provided with two symmetrical pin blind holes. Each pin blind hole is connected to a pin 11. The pin 11 is made of metal. The bottom baffle 8 is suspended below the two pins 11 to limit the bottom of the bottom block 7 and prevent the bottom block 7 from falling off.

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

[0036] In this embodiment, as Figure 3-4 As shown, the specially designed 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, and the baffle forming section 303 is a strip-shaped cylinder. Figure 6 As shown, the feeding device 2 includes a funnel-shaped feeding section 201 and a cylinder connecting section 202. The outer wall of the funnel-shaped feeding section 201 is provided with a strip-shaped placement groove 203. 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-shaped feeding section 201. The bottom of the baffle feeding section 301 is placed at the top of the extrusion cylinder 4, and the baffle pre-pressing section 302 extends into the inner hole of the extrusion cylinder 4. The baffle pre-pressing section 302 is in sliding and sealing contact with the inner hole wall of the extrusion cylinder 4.

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

[0038] In this embodiment, as Figure 5 As 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-compression section 302 of the special baffle 3. The inner wall of the slot 101 of the thrust rod 1 can slide and seal in contact with both the baffle feeding section 301 and the baffle pre-compression section 302 of the special baffle 3, and the outer wall of the thrust rod 1 slides and seals in contact with the inner wall of the extrusion cylinder 4.

[0039] The extrusion cylinder 4 is a hollow cylindrical mold, requiring a smooth inner wall in the hollow section. The outer wall has a connecting groove 401 for connecting and fixing the flange 5. Symmetrical blind holes for pins 11 (metal pins) are located at the bottom of the outer wall to ensure the connection strength of the bottom baffle 8. The top connects to the bottom of the feeding device 2, ensuring the center lines of the two components are on the same straight line. The special baffle 3 is a specially made hard, thin metal part, divided into three sections: the baffle feeding section 301, the baffle pre-forming section 302, and the baffle forming section 303. Each section has a different shape and function. The baffle feeding section 301 is used to prevent the two colors of curing materials from mixing. The baffle preforming section 302 is where the two different colors of curing materials are compressed in their respective material cavities (i.e., material cavity one 12 and material cavity two 13). The baffle forming section 303 is a solid cylinder that serves as the space for the two different colors of curing materials to merge. 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. The special baffle 3 is slidably connected to the extrusion cylinder 4. Figure 1 In the process, 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 cylinder 4; the feeding device 2 is a funnel-shaped feeding mold with a central mounting groove 203 for placing the special baffle 3, and the bottom of the feeding device 2 is slidably connected to the extrusion cylinder 4; the bottom stop 7 is a hollow cylindrical stop, the outer wall of the bottom stop 7 is smooth and fits the inner wall of the extrusion cylinder 4, and the inner wall of the bottom stop 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 bent part and the extrusion material The pin 11 installed on the blind hole of the pin at the bottom of the outer wall of the cylinder 4 is used to prevent the bottom stop 7 from falling, so that the curing material inside the cylinder can reach its proper compressed volume and strength; the thrust rod 1 is a solid long cylindrical push rod with a hollow groove, which is mainly used to apply downward thrust so that the curing material is formed through the three forming areas to become the two-color spiral preform we need; the outer frame bracket 6 is a C-shaped mounting bracket with four threaded holes at the top for connection with the fixing flange 5 and a mounting through hole through which the extrusion cylinder 4 passes, which is mainly used to fix the extrusion cylinder 4.

[0040] Preparations before manufacturing include the entire set of parts according to... Figure 1Assemble the components, ensuring all parts are clean, tidy, and free of burrs. The outer frame bracket 6 contacts the workbench surface, raising the entire fixture for easier subsequent operations. The outer frame bracket 6 and extrusion cylinder 4 are positioned and installed using the fixing flange 5, and then secured with locking screws 9. The inner hole of the extrusion cylinder 4 slides into the outer wall of the bottom stop 7, and symmetrical blind holes for pins 11 are provided on the lower part of the outer wall of the extrusion cylinder 4. A specially designed bottom baffle 8 is used to suspend the two metal pins 11 below. The bottom baffle 8 has a hanging groove for suspending the two... Below the metal pin 11, the bottom of the bottom stop 7 is limited; the feeding device 2 slides with the extrusion cylinder 4, and the feeding device 2 is placed on top of the extrusion cylinder 4. Finally, a special baffle 3 is placed in the feeding device 2. The baffle feeding section 301 of the special baffle 3 slides with the feeding device 2, the baffle pre-pressing section 302 of the special baffle 3 slides with the inner wall of the extrusion cylinder 4, and the baffle forming section 303 of the special baffle 3 slides with the inner wall of the bottom stop 7, ensuring that the center lines of the feeding device 2, the special baffle 3, the cylinder 4, and the bottom stop 7 are all on the same straight line. The assembled device is as follows: Figure 1 As shown, it can be divided into the following sections by the special baffle 3: Figure 9 The two identical feeding chambers, 12 and 13, are shown for later use. A schematic diagram of the feeding chambers during operation of the assembled device is shown below. Figure 9 As shown, the entire material chamber is divided into a feeding section, a pre-forming section, and a forming section.

[0041] Prepare N grams each of A and B color PTFE curing materials. Add each of the A and B color PTFE curing materials to the assembled feeding chamber. Apply downward pressure using the push rod 1 to obtain two semi-circular pre-compressed blanks in the middle of the tooling. Remove the bottom baffle 8, lift the push rod 1, and add N grams of the same weight of A and B color PTFE curing materials again. Apply pressure using the push rod 1. After the pre-formed blanks are extruded and filled with gaps on the inner surface of the extrusion cylinder 4, slowly push the bottom baffle 7 out of the extrusion cylinder 4 until it is completely detached. Repeat the above steps to obtain a continuous two-color annular cylindrical tube blank, i.e., as shown in the image. Figure 7-8 The two-color precast tube blank 10 is shown.

[0042] The continuous extrusion device for two-color precast tube blanks of this utility model mainly consists of a feeding device 2, an extrusion cylinder 4, a special baffle 3, and a thrust rod 1. Two different colored polytetrafluoroethylene (PTFE) curing materials of the same weight are pushed downward by the thrust rod 1, causing the PTFE curing materials to pass through the... Figure 9The extrusion barrel 4, the special baffle 3, and the feeding device 2, as shown, form a feeding section, a preforming section, and a forming section, directly producing a two-color preformed tube blank 10 (i.e., a two-color spiral preformed tube blank), which is a PTFE blank tube. The entire process does not involve complicated mold disassembly and assembly steps; it only requires repeatedly moving the thrust rod 1 and adding the same weight of PTFE curing material to continuously obtain two-color spiral preformed tube blanks that can be directly fed into the extruder. Moreover, this device can continuously extrude stably and reliably. Compared with previous preparation devices, this continuous extrusion device has a novel and simple structure, and the preparation process of this continuous extrusion device is also simple and efficient, which can avoid the errors of a large number of manual steps and greatly improve the work efficiency.

[0043] The scope of protection of this utility model includes, but is not limited to, the above embodiments. The scope of protection of this utility model is defined by the claims. Any substitutions, modifications, or improvements to this technology that are easily conceived by those skilled in the art shall fall within the scope of protection of this utility model.

Claims

1. A continuous extrusion apparatus for two-color preformed tube blanks, characterized in that: It includes an extrusion cylinder (4), a special baffle (3), a feeding device (2), a thrust rod (1), and an outer frame support (6); The extrusion cylinder (4) is connected to the outer frame support (6). The top of the extrusion cylinder (4) is located in the bottom inner hole of the feeding device (2). The bottom inner hole wall of the feeding device (2) slides in contact with the outer circular wall of the top of the extrusion cylinder (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-compression section (302) contacts the inner wall of the extrusion cylinder (4). The baffle feeding section (301) and the baffle pre-compression section (302) of the special baffle (3) divide the cavity composed of the feeding device (2) and the extrusion cylinder (4) into feeding cavity one (12) and feeding cavity two (13). The baffle forming section (303) of the baffle forming section (303) is located on the center line of the extrusion cylinder (4). The center lines of the feeding device (2), the special baffle (3), and the extrusion cylinder (4) are all on the same straight line. The push rod (1) has a slot (101) in the middle that extends along its length and passes through one end. The slot (101) of the push rod (1) can slide in contact with the baffle feeding section (301) and the baffle pre-pressing section (302) of the special baffle (3). The push rod (1) can extend into the interior of the extrusion cylinder (4). The outer wall of the push rod (1) slides in contact with the inner wall of the extrusion cylinder (4).

2. The continuous extrusion apparatus for two-color preformed tube blanks according to claim 1, characterized in that: It also includes a fixing flange (5), and the outer frame bracket (6) is provided with an installation through hole. The extrusion cylinder (4) passes through the installation through hole on the outer frame bracket (6) and is connected to the outer frame bracket (6) through the fixing flange (5) and the locking screw (9).

3. The continuous extrusion apparatus for two-color preformed tube blanks 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 inside the inner hole of the extrusion barrel (4) and the outer wall of the bottom stop (7) slides in contact with the inner hole wall of the extrusion barrel (4); the bottom of the extrusion barrel (4) is connected to a bottom baffle (8) for limiting the bottom stop (7); the baffle forming section (303) of the special baffle (3) slides in contact with the inner hole wall of the bottom stop (7).

4. The continuous extrusion apparatus for two-color preformed tube blanks according to claim 3, characterized in that: The outer circular wall of the bottom stop (7) is in sliding sealing contact with the inner wall of the extrusion cylinder (4).

5. The continuous extrusion apparatus for two-color preformed tube blanks according to claim 3, characterized in that: The outer circular wall at the bottom of the extrusion cylinder (4) is provided with two symmetrical pin blind holes, and each pin blind hole is connected with a pin (11). The bottom baffle (8) is suspended below the two pins (11) and is used to limit the bottom of the bottom stop (7).

6. The continuous extrusion apparatus for two-color preformed tube blanks according to claim 3, characterized in that: The feeding device (2) includes a funnel-shaped feeding section (201) and a material cylinder connecting section (202). The outer wall of the funnel-shaped feeding section (201) is provided with a strip-shaped placement groove (203). The baffle feeding section (301) is wider at the top and narrower at the bottom. The outer wall of the baffle feeding section (301) is in sliding and sealed contact with the strip-shaped placement groove (203) of the funnel-shaped feeding section (201). The bottom of the baffle feeding section (301) is placed at the top of the extrusion cylinder (4). The baffle pre-pressing section (302) extends into the inner hole of the extrusion cylinder (4). The baffle pre-pressing section (302) is in sliding and sealed contact with the inner hole wall of the extrusion cylinder (4).

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

8. The continuous extrusion apparatus for two-color preformed tube blanks according to claim 1, characterized in that: 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 slide and seal in contact with 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) slides and seals in contact with the inner wall of the extrusion cylinder (4).

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

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