Extruder die head

Abstract

The utility model provides an extruder die head, and belongs to the technical field of extruder die head design, the extruder die head comprises a connection section, a core die, a mouth die and a die sleeve which are connected in sequence, the two ends of the connection section are provided with a main runner and a secondary runner respectively, a porous runner communicating the main runner with the secondary runner is arranged in the connection section, and a sprue spreader is arranged in the main runner; the functions of a perforated plate, a connecting section, a splitter plate and the like of a traditional extruder die head are replaced by the connecting section, so that the die head is more convenient to install, the volume of a flow channel in the die head is greatly reduced, the phenomena of material decomposition or superplasticization and the like can be effectively reduced when thin-wall pipes and other pipes with few materials are extruded, and the production cost is reduced. The problem that the appearance and the performance of a thin-wall pipe finished product are affected due to the fact that a polymer material is easy to decompose or superplasticize in a machine head when the polymer material required by the pipe is less in a traditional extruder die head is solved.

Description

Technical Field

[0001] The present application relates to the technical field of extruder die head design, and in particular to an extruder die head. Background Art

[0002] In the field of medical composite tubing, high performance requirements are placed on composite tubing, such as torsional rigidity, flexibility, and biocompatibility. The outer diameter of the entire composite tubing must be as small as possible to allow for smoother passage through human tissue, while the inner diameter must be as large as possible to accommodate larger instruments. To meet these requirements, the outer sheath of the composite tubing is typically required to be very thin, using a very small amount of polymer material. Due to biocompatibility requirements, medical polymer materials cannot contain additives related to hydrolysis resistance and heat resistance, making them relatively easy to decompose.

[0003] The structure of the traditional extruder die head is relatively complex, and the internal flow channel volume is large, and a large amount of polymer melt accumulates in the flow channel. When the polymer material required for the pipe is small, the polymer material will accumulate inside the die head for a very long time, which can easily cause the polymer material to decompose or superplasticize here, affecting the appearance and performance of the finished thin-walled pipe. Utility Model Content

[0004] An embodiment of the present application provides an extruder die head with a simple die head structure, a short flow channel and a small flow channel volume, which can reduce the residence time of the polymer melt in the flow channel and is easy to install and disassemble. It is very suitable for making thin-walled polymer pipes. The present application solves the problem of traditional extruder die heads that when the polymer material required for the pipe is small, the polymer material is easily decomposed or superplasticized inside the die head, affecting the appearance and performance of the finished thin-walled pipe.

[0005] The embodiment of the present application provides an extruder die head, comprising a connecting section, a core die, a die mouth, and a die sleeve connected in sequence;

[0006] The connecting section includes a large cylindrical section and a small cylindrical end, the small cylindrical end is fixedly mounted on the second end of the large cylindrical section, the first end of the large cylindrical section is provided with a main flow channel, the second end is provided with a secondary flow channel, the large cylindrical section is provided with a porous flow channel connecting the main flow channel and the secondary flow channel, and the main flow channel is provided with a diverter cone;

[0007] The core mold includes a connecting section, a vertebral section, and an extrusion section, wherein the connecting section, the vertebral section, and the extrusion section are connected in sequence as an integral structure, a first screw hole is provided at a first end of the connecting section, the small cylindrical end is screwed to the first screw hole, and a first vent hole is provided at a second end of the connecting section that is connected to the first screw hole;

[0008] The first end of the die is provided with a tapered groove, and the middle part of the second end is provided with an extrusion port connected to the tapered groove. The die is sleeved with the core die, wherein the tapered groove is sleeved with the vertebral body segment, and the gap between the two forms a tapered flow channel, and the extrusion port is sleeved with the extrusion segment, and the gap between the two forms an extrusion flow channel;

[0009] The mold sleeve is connected to the core mold and the mouth mold, and a mold sleeve flow channel is formed between the mold sleeve and the core mold. The main flow channel, the porous flow channel, the secondary flow channel, the mold sleeve flow channel, the tapered flow channel and the extrusion flow channel are connected in sequence.

[0010] In a feasible implementation, the extruder die head further includes a die plate;

[0011] The outer wall of the second end of the die is provided with an annular groove, and the die pressing plate is sleeved in the annular groove;

[0012] A second screw hole is provided in the middle of the second end of the mold sleeve, and the outer wall of the die pressing plate is screwed to the second screw hole.

[0013] In a feasible implementation, the extruder die head further includes a flange;

[0014] The flange is sleeved on the mold sleeve and connected to the connecting section, and a clamping ring is provided on the inner wall of the second end of the flange;

[0015] A clamping groove is provided on the outer wall of the second end of the mold sleeve, and the clamping ring of the flange is sleeved on the clamping groove of the mold sleeve.

[0016] In a feasible implementation, the extruder die head also includes an adjusting bolt

[0017] The outer wall of the flange is provided with a plurality of adjustment holes, and the plurality of adjustment bolts correspond to the plurality of adjustment holes one by one. The plurality of adjustment bolts are all screwed with the corresponding adjustment holes and abut against the side wall of the mold sleeve.

[0018] In a feasible implementation, the extruder die head further includes a fixing bolt;

[0019] The connecting section is provided with a plurality of first through holes, and the flange is provided with a plurality of second through holes. The plurality of first through holes, the plurality of second through holes and the plurality of fixing bolts correspond to each other one by one. The plurality of fixing bolts pass through the corresponding second through holes and the first through holes in sequence and are screwed to the barrel of the extruder.

[0020] In a feasible implementation, a heating ring is provided on the end of the small cylinder.

[0021] In a feasible implementation, a filter is provided in the main flow channel of the connecting section.

[0022] In a feasible implementation, a first mounting hole is provided on an outer wall of the connecting section, and a temperature sensor is provided in the first mounting hole.

[0023] In a feasible implementation, a second mounting hole is provided on the outer wall of the connecting section, and a pressure sensor is provided in the second mounting hole.

[0024] In a feasible implementation, a second ventilation hole is provided at the second end of the connecting section, and the second ventilation hole is connected to the first mounting hole and the second mounting hole.

[0025] An extruder die head provided in an embodiment of the present application is characterized in that a main channel and a secondary channel are respectively arranged at both ends of a connecting section, a porous channel connecting the main channel and the secondary channel is arranged in the connecting section, and a diverter cone is provided in the main channel. The functions that can be achieved by the porous plate, connecting section, diverter plate and other parts of a traditional extruder die head are replaced by the connecting section, making the installation of the die head more convenient and greatly reducing the volume of the channel in the die head. When extruding pipes with less material such as thin walls, the occurrence of material decomposition or superplasticization can be effectively reduced, and the problem of traditional extruder die heads that when the polymer material required for the pipe is less, the polymer material is easily decomposed or superplasticized inside the die head, affecting the appearance and performance of the finished thin-walled pipe is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the extruder die head provided by this application;

[0027] Figure 2 It is the main cross-sectional view of the extruder die head;

[0028] Figure 3 It is a structural diagram of the first-person perspective of the transition section;

[0029] Figure 4 It is a structural diagram of the second perspective of the transition section;

[0030] Figure 5 It is a cross-sectional view of the connecting section.

[0031] Description of reference numerals:

[0032] 10-connecting section; 20-core mold; 30-die; 40-die sleeve; 50-die pressure plate; 60-flange; 70-adjusting bolt; 80-fixing bolt;

[0033] 11-large cylindrical section; 12-small cylindrical end; 13-main flow channel; 14-secondary flow channel; 15-porous flow channel; 16-diverter cone; 17-first mounting hole; 18-second mounting hole; 21-connecting section; 22-vertebral section; 23-extrusion section; 24-first screw hole; 25-first vent hole; 31-conical groove; 32-extrusion port; 33-annular groove; 41-second screw hole; 42-slot; 61-snap ring; 62-adjustment hole. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0035] A composite pipe extruder is a device used to produce composite pipes. It combines different materials through extrusion to form pipes with specific properties. Its main components include a control system, extruder, die head, shaping and cooling system, haul-off unit, cutting device, and turning rack. The die head is responsible for shaping the extruded material into the shape of the pipe.

[0036] The die head structure of traditional extruders is relatively complex, and the internal flow channel volume is large, so more polymer melt accumulates in the flow channel. When the polymer material required for the pipe is small, the polymer material will accumulate in the die head for a very long time, which can easily lead to the decomposition or superplasticization of the polymer material, affecting the appearance and performance of the finished thin-walled pipe.

[0037] The die head structure provided in this application has a simple structure, a short flow channel and a small flow channel volume, which can reduce the residence time of the polymer melt in the flow channel, and is easy to install and disassemble, and is very suitable for making thin-walled polymer pipes.

[0038] The specific structure of the extruder die head provided in this application is described in detail below with reference to the accompanying drawings.

[0039] Reference Figure 1-Figure 5 As shown, the embodiment of the present application provides an extruder die head, comprising a connecting section 10, a core die 20, a die 30 and a die sleeve 40 connected in sequence, one end of the connecting section 10 is connected to the barrel of the extruder, the core die 20 is arranged at the other end of the connecting section 10, and the die 30 is sleeved with the core die 20;

[0040] like Figure 5As shown, the connecting section 10 includes a large cylindrical section 11 on the left and a small cylindrical end 12 on the right. The small cylindrical end 12 is fixed to the second end of the large cylindrical section 11. The large cylindrical section 11 and the small cylindrical end 12 can be an integrated structure. A main flow channel 13 is provided in the middle of the left end of the large cylindrical section 11. The main flow channel 13 can be a circular flow channel. A diverter cone 16 is provided in the main flow channel 13. The left end of the diverter cone 16 is a cone end and is coaxial with the main flow channel 13 and does not extend out of the main flow channel 13. The middle of the right end of the large cylindrical section 11 is provided The secondary flow channel 14 can be an annular flow channel, and the outer diameter of the annular flow channel matches the diameter of the circular flow channel. A porous flow channel 15 is provided in the large cylindrical section 11 to connect the main flow channel 13 and the secondary flow channel 14. The porous flow channel 15 is composed of a plurality of through holes arranged in a circular shape, and the plurality of through holes are evenly distributed. An annular connecting groove is provided on the outer wall of the left end of the large cylindrical section 11. The large cylindrical section 11 is embedded in the corresponding groove in the extruder barrel through the annular connecting groove to connect the extruder die head to the barrel.

[0041] like Figure 2 As shown, the core mold 20 includes a connecting section 21, a vertebral section 22 and an extrusion section 23. The connecting section 21, the vertebral section 22 and the extrusion section 23 are sequentially connected from left to right and can be an integral structure. The connecting section 21 can be a cylinder, and the outer diameter matches the inner diameter of the secondary flow channel 14. A first screw hole 24 is provided in the middle of the left end of the connecting section 21. The small cylindrical end 12 is screwed to the first screw hole 24 to fix the core mold 20 on the connecting section 10. A first vent 25 connected to the first screw hole 24 is provided in the middle of the right end of the connecting section 21. The first vent 25 passes through the vertebral section 22 and the extrusion section 23, thereby facilitating air circulation and facilitating the screw connection of the small cylindrical end 12 to the first screw hole 24.

[0042] The left end of the die 30 is provided with a tapered groove 31, and the middle part of the right end is provided with an extrusion port 32 connected to the tapered groove 31. The die 30 is sleeved with the core die 20, wherein the tapered groove 31 is sleeved with the vertebral body segment 22, and the gap between the two forms a tapered flow channel, and the extrusion port 32 is sleeved with the extrusion segment 23, and the gap between the two forms an extrusion flow channel;

[0043] The mold sleeve 40 is connected to the core mold 20 and the mouth mold 30. The fitting clearance between the mold sleeve 40 and the mouth mold 30 should be smaller than the overflow value of the polymer material. A mold sleeve flow channel is formed between the mold sleeve 40 and the core mold 20. The main flow channel 13, the porous flow channel 15, the secondary flow channel 14, the mold sleeve flow channel, the tapered flow channel and the extrusion flow channel are connected in sequence.

[0044] The functions that can be achieved by the porous plate, connecting section, diverter plate and other parts of the traditional extruder die are replaced by the connecting section 10, making the die installation more convenient; the flow channel volume in the die is greatly reduced, and when extruding thin-walled pipes with less material, the occurrence of material decomposition or superplasticization can be effectively reduced.

[0045] Reference Figure 1 and Figure 2 As shown, in some embodiments, the extruder die head further includes a die pressing plate 50, which is an annular pressing plate with an outer wall provided with an external thread;

[0046] The right outer wall of the die 30 is provided with an annular groove 33, the die pressing plate 50 is sleeved in the annular groove 33, and the left outer wall of the die pressing plate 50 is clamped with the left outer wall of the annular groove 33;

[0047] A second screw hole 41 is provided in the middle of the right end of the die sleeve 40. The outer wall of the die pressing plate 50 is screwed into the second screw hole 41 to secure the die pressing plate 50 to the die sleeve 40, thereby securing the die 30 in the die sleeve 40.

[0048] When the die 30 needs to be replaced, the die pressing plate 50 is rotated clockwise to separate the die pressing plate 50 from the die sleeve 40, the replaced die 30 can be pulled out, and the new die 30 is inserted into the second screw hole 41 of the die sleeve 40. The movable die pressing plate 50 is rotated counterclockwise to fix the movable die pressing plate 50, and the replacement of the die 30 is completed.

[0049] Reference Figure 1 and Figure 2 As shown, in some embodiments, the extruder die head further includes a flange 60;

[0050] The main body of the flange 60 is an annular structure. The flange 60 is sleeved with the mold sleeve 40 and connected to the connecting section 10. The flange 60 includes a ring body, and a clamping ring 61 is provided on the inner wall of the right end of the ring body.

[0051] A card slot 42 is provided on the right outer wall of the mold sleeve 40, and the snap ring 61 of the flange 60 is sleeved on the card slot 42 of the mold sleeve 40, and the left side of the snap ring 61 is snapped with the left end outer wall of the card slot 42. When the flange 60 is connected to the connecting section 10, the mold sleeve 40 is fixed under the limiting action of the flange 60, and then the die pressure plate 50 and the die 30 are fixed.

[0052] Reference Figure 1 and Figure 2 As shown, in some embodiments, the extruder die head further includes an adjusting bolt 70, which is a conventional bolt with a certain length;

[0053] The outer wall of the flange 60 is provided with a plurality of adjustment holes 62 , and a plurality of adjustment bolts 70 correspond one to one with the plurality of adjustment holes 62 . The plurality of adjustment bolts 70 are all screwed into the corresponding adjustment holes 62 and abut against the side wall of the mold sleeve 40 ;

[0054] The outer wall of the flange 60 is provided with four adjustment holes 62, and the four adjustment holes 62 are evenly distributed in a cross shape. An adjustment bolt 70 is screwed in each adjustment hole 62. When the adjustment bolt 70 is rotated clockwise, the adjustment bolt 70 moves outward and separates from the mold sleeve 40. When the adjustment bolt 70 is rotated counterclockwise, the adjustment bolt 70 moves inward and abuts the mold sleeve 40. By rotating multiple adjustment bolts 70, the relative position of the mold sleeve 40 and the connecting section 10 can be adjusted to ensure that the secondary flow channel 14 is connected to the mold sleeve flow channel.

[0055] Reference Figure 1 and Figure 2 As shown, in some embodiments, the extruder die head further includes a fixing bolt 80, which is a conventional bolt with a certain length;

[0056] The connecting section 10 is provided with a plurality of first through holes transversely, and the flange 60 is provided with a plurality of second through holes transversely. The plurality of first through holes, the plurality of second through holes, and the plurality of fixing bolts 80 correspond to each other one by one. The plurality of fixing bolts 80 are sequentially passed through the corresponding second through holes and first through holes and are screwed to the barrel of the extruder.

[0057] The fixing bolts 80 pass through the flange 60 and the connecting section 10 from right to left in sequence and are connected to the extruder, so that the flange 60 and the connecting section 10 fit tightly.

[0058] Reference Figure 2 and Figure 5 As shown, in some embodiments, a heating ring is provided on the small cylindrical end 12, and the heating ring is used to ensure the melt temperature.

[0059] Reference Figure 1 As shown, in some embodiments, a filter is provided in the main channel of the connecting section 10. The filter may be a metal filter for filtering out impurities in the melt.

[0060] Reference Figure 2-4 As shown, in some embodiments, a first mounting hole 17 is provided on the outer wall of the connecting section 10, a temperature sensor is provided in the first mounting hole 17, a second mounting hole 18 is provided on the outer wall of the connecting section 10, a pressure sensor is provided in the second mounting hole 18, both the temperature sensor and the pressure sensor are connected to the external control system, a second ventilation hole is provided at the second end of the connecting section 10, and the second ventilation hole is communicated with the first mounting hole 17 and the second mounting hole 18, thereby facilitating the installation of the sensor.

[0061] According to the above technical features, the working principle of the extruder die head provided by this application in actual application scenarios is:

[0062] The large cylindrical section 11 of the connecting section 10 is partially embedded in the corresponding groove in the extruder barrel, and four fixing bolts 80 are located on the front of the flange 60, passing through the flange 60 and the connecting section 10, and are threadedly connected to the barrel of the extruder, thereby fixing the entire die head;

[0063] During production, the melt in the extruder barrel enters the connecting section 10, flows through the main channel 13, the porous channel 15 and the secondary channel 14 in sequence, enters the mold sleeve flow channel between the mold sleeve 40 and the core mold 20, and then enters the tapered flow channel and extrusion flow channel between the die 30 and the core mold 20, and finally flows out of the extrusion port 32 to form a tube embryo to be formed.

[0064] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application based on the several embodiments provided in the present application to obtain other embodiments, and these embodiments do not exceed the scope of protection of the present application.

[0065] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the scope of protection of the embodiments of the present application.

Claims

1. An extruder die head, characterized in that: It comprises a connecting section (10), a core die (20), a mouth die (30) and a die sleeve (40) which are connected in sequence; The connecting section (10) comprises a large cylindrical section (11) and a small cylindrical end (12), wherein the small cylindrical end (12) is fixedly arranged at the second end of the large cylindrical section (11), a main flow channel (13) is provided at the first end of the large cylindrical section (11), and a secondary flow channel (14) is provided at the second end thereof, a porous flow channel (15) is provided in the large cylindrical section (11) for communicating with the main flow channel (13) and the secondary flow channel (14), and a diverter cone (16) is provided in the main flow channel (13); The core mold (20) comprises a connecting section (21), a vertebral section (22) and an extrusion section (23); the connecting section (21), the vertebral section (22) and the extrusion section (23) are an integral structure connected in sequence; a first screw hole (24) is provided at a first end of the connecting section (21); the small cylindrical end (12) is screwed to the first screw hole (24); and a first vent hole (25) is provided at a second end of the connecting section (21) and is in communication with the first screw hole (24); The first end of the die (30) is provided with a tapered groove (31), and the middle part of the second end is provided with an extrusion port (32) connected to the tapered groove (31); the die (30) is sleeved on the core die (20), wherein the tapered groove (31) is sleeved on the vertebral body segment (22), and the gap between the two forms a tapered flow channel; the extrusion port (32) is sleeved on the extrusion segment (23), and the gap between the two forms an extrusion flow channel; The mold sleeve (40) is sleeved on the core mold (20) and the mouth mold (30), and a mold sleeve flow channel is formed between the mold sleeve (40) and the core mold (20), and the main flow channel (13), the porous flow channel (15), the secondary flow channel (14), the mold sleeve flow channel, the tapered flow channel and the extrusion flow channel are connected in sequence.

2. The extruder die head according to claim 1, wherein: The extruder die also includes a die plate (50); An annular groove (33) is provided on the outer wall of the second end of the die (30), and the die pressing plate (50) is sleeved on the annular groove (33); A second screw hole (41) is provided in the middle of the second end of the mold sleeve (40), and the outer wall of the die pressing plate (50) is screwed to the second screw hole (41).

3. The extruder die head according to claim 2, characterized in that: The extruder die head also includes a flange (60); The flange (60) is sleeved on the mold sleeve (40) and connected to the connecting section (10), and a snap ring (61) is provided on the inner wall of the second end of the flange (60); A clamping groove (42) is provided on the outer wall of the second end of the mold sleeve (40), and the clamping ring (61) of the flange (60) is sleeved on the clamping groove (42) of the mold sleeve (40).

4. The extruder die head according to claim 3, wherein: The extruder die head also includes an adjusting bolt (70); The outer wall of the flange (60) is provided with a plurality of adjustment holes (62), and the plurality of adjustment bolts (70) correspond one-to-one to the plurality of adjustment holes (62). The plurality of adjustment bolts (70) are all screwed with the corresponding adjustment holes (62) and abut against the side wall of the mold sleeve (40).

5. The extruder die head according to claim 3, characterized in that: The extruder die head also includes a fixing bolt (80); The connecting section (10) is provided with a plurality of first through holes, and the flange (60) is provided with a plurality of second through holes. The plurality of first through holes, the plurality of second through holes and the plurality of fixing bolts (80) correspond to each other one by one. The plurality of fixing bolts (80) pass through the corresponding second through holes and the first through holes in sequence and are screwed to the barrel of the extruder.

6. The extruder die head according to claim 1, characterized in that: A heating ring is provided on the small cylindrical end (12).

7. The extruder die head according to any one of claims 1 to 6, characterized in that: A filter is provided in the main flow channel of the connecting section (10).

8. The extruder die head according to claim 7, characterized in that: The outer wall of the connecting section (10) is provided with a first mounting hole (17), and a temperature sensor is provided in the first mounting hole (17).

9. The extruder die head according to claim 8, characterized in that: The outer wall of the connecting section (10) is provided with a second mounting hole (18), and a pressure sensor is provided in the second mounting hole (18).

10. The extruder die head according to claim 9, characterized in that: The second end of the connecting section (10) is provided with a second ventilation hole, and the second ventilation hole is in communication with the first mounting hole (17) and the second mounting hole (18).

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