A three-layer co-extrusion head structure

Abstract

The utility model provides a three-layer co-extrusion head structure, comprising a fixing frame, an extrusion barrel 1, an extrusion barrel 2 and an extrusion barrel 3, a flow groove 1 is provided on the surface of the extrusion barrel 1, a flow groove 2 is provided on the extrusion barrel 3, a flow groove 3 is provided on the surface of the extrusion barrel 2, the flow groove 1 and the mounting block form a flow channel 1, the flow channel 3 and the inner wall of the extrusion barrel 1 form a flow channel 3, the flow channel 1 and the flow channel 3 both include a feed port and a discharge port, the feed port is a single flow channel, the discharge port is a double flow channel, the single flow channel is converted into a double flow channel, the flow channel is adapted to the fluidity requirements of polypropylene and polyethylene at the same time, and the problems of retention and uneven flow are avoided, the extrusion barrel 1, the extrusion barrel 2 and the extrusion barrel 3 are detachably connected to the fixing frame, so that when the thickness of a certain layer of the cable needs to be adjusted, the corresponding extrusion barrel can be replaced without replacing the entire extrusion head, so that the cost is low when producing non-standard cables.

Description

Technical Field

[0001] The utility model relates to extrusion equipment, in particular to a three-layer co-extrusion head structure. Background Art

[0002] A co-extrusion die is a die for an extruder, which is usually connected to multiple extruders. The materials in different extruders flow along independent flow channels and converge at the outlet to form a multi-layer plastic extrusion product. Co-extrusion dies are usually used in the field of cable manufacturing.

[0003] At present, a Chinese patent with announcement number CN205692636U discloses a three-layer sheath co-extrusion head, including a body, in which a first through hole, a second through hole and a third through hole are arranged, and injection nozzles are installed in the first through hole, the second through hole and the third through hole, and are respectively connected to different storage cavities, thereby realizing the function of wrapping and extruding three different plastics at the same time.

[0004] The above patent still has shortcomings. There are many sizes and models of cables. When manufacturing cables of non-standard sizes, the thickness of each functional layer also needs to be adjusted according to different design requirements. The through holes of the above co-extrusion head cannot be changed and cannot meet the production of non-standard cables. When extruding non-standard cables, the entire co-extrusion head needs to be replaced, which leads to higher production costs for non-standard cables. Utility Model Content

[0005] In view of this, the utility model aims to provide a three-layer co-extrusion head structure, which has the function of adjusting the cable layer thickness.

[0006] In order to solve the above technical problems, the technical solution of the utility model is: a three-layer co-extrusion head structure, including a fixed frame, an extrusion barrel 1, an extrusion barrel 2 and an extrusion barrel 3, the two sides of the fixed frame are respectively provided with a mounting hole 1 and a mounting hole 2, the extrusion barrel 1 is detachably arranged in the mounting hole 1, the extrusion barrel 2 is detachably arranged in the mounting hole 2, the extrusion barrel 1 is provided with a mounting hole 3, the extrusion barrel 3 is detachably arranged in the mounting hole 3, the extrusion barrel 1 is provided with a flow groove 1 on the surface, the extrusion barrel 3 is provided with a flow groove 2, and the extrusion barrel 2 is provided with a flow groove 3 on the surface.

[0007] Through the above technical means, the extrusion barrel one, the extrusion barrel two and the extrusion barrel three are detachably connected to the fixed frame, so that when the thickness of a certain layer of the cable needs to be adjusted, the corresponding extrusion barrel can be replaced without replacing the entire extrusion head, thereby reducing the cost when producing non-standard cables.

[0008] Preferably, the tail of the extrusion tube one is provided with a flange seat one, the tail of the extrusion tube three is provided with a flange seat two, the flange seat one is fixed to the fixing frame by screws, the flange seat two is fixed to the flange seat one by screws, the extrusion tube two is arranged on the opposite side of the extrusion tube one, and a flange seat three is provided at its tail, and the flange seat three is fixed to the fixing frame by screws.

[0009] Through the above technical means, the extrusion cylinders 1 and 3 are fixed on the fixing frame by screw fixation between the flange seat 1 and the flange seat 2 and by screw fixation between the flange seat 1 and the fixing frame, and the flange seat 2 is fixed on the fixing frame by screw fixation between the flange seat 3 and the fixing frame.

[0010] Preferably, a mounting block is provided between the mounting hole one and the mounting hole two, when the extrusion tube one is installed in the mounting hole one, the flow groove one and the mounting block form flow channel one, when the extrusion tube two is installed in the mounting hole two, the flow groove two and the mounting block form flow channel two, when the extrusion tube three is arranged in the extrusion tube one, the flow groove three and the inner wall of the extrusion tube one form flow channel three, and three feed pipe openings are also provided on the fixed frame, and the three feed pipe openings are respectively connected to flow channel one, flow channel two and flow channel three.

[0011] Through the above-mentioned technical means, through the cooperation between the mounting block and the extrusion barrel, flow channel one, flow channel two and flow channel three are formed, so that the outside of the cable is gradually wrapped with plastics with different functions, and the three feed pipe openings are respectively connected to flow channel one, flow channel two and flow channel three, so that plastics with different functions are transported to the three flow channels respectively.

[0012] Preferably, the flow channel one and the flow channel three both include a feed port and a discharge port, the feed port is a single flow channel, and the discharge port is a double flow channel.

[0013] Through the above technical means, by setting up double flow channels, the pressure during extrusion is made uniform and the plasticization is good, while the glue seam problem is reduced.

[0014] Preferably, the extrusion cylinder 2 comprises a base cylinder 1 and an inner cylinder 1, a flange seat 4 is arranged at the tail of the inner cylinder 1, the inner cylinder 1 is arranged inside the base cylinder 1, and the flange seat 3 is fixed to the flange seat 4 by screws.

[0015] Through the above technical means, the inner tube 1 and the base tube 1 are fixed by screws. When the thickness of the outer side of the cable needs to be adjusted, the thickness can be replaced by disassembling and replacing the inner tube 1, thereby further reducing the replacement cost.

[0016] Preferably, a replacement ring 1 is further provided at the extrusion end of the extrusion barrel 3, the replacement ring 1 is threadedly connected to the extrusion barrel 3, and a screw block 1 is further provided on the end surface of the replacement ring 1.

[0017] Through the above technical means, the replacement ring 1 is threadedly connected to the extrusion barrel 3, so that the replacement ring 1 is fixed to the end of the extrusion barrel 3. By arranging a screw block 1 on the replacement ring 1, it is convenient to disassemble and replace the replacement ring 1.

[0018] Preferably, a second replacement ring is further provided in the installation block, the second replacement ring is threadedly connected to the installation block, and a second screw block is further provided on the end surface of the second replacement ring.

[0019] Through the above technical means, the replacement ring 1 is fixed on the mounting block by threading the replacement ring 2 with the mounting block, and the replacement ring 2 can be easily disassembled and replaced by arranging the screw block 1 on the replacement ring 2. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an embodiment;

[0021] Figure 2 is a cross-sectional schematic diagram of an embodiment;

[0022] Figure 3 is a schematic diagram of the structure of the fixing frame;

[0023] Figure 4 It is a structural schematic diagram of the extrusion cylinder three;

[0024] Figure 5 A partial cross-sectional view of an embodiment;

[0025] Figure 6 Schematic diagram of the structure of replacing ring 2.

[0026] Figure numerals: 1, fixing frame; 2, extrusion cylinder one; 3, extrusion cylinder two; 4, extrusion cylinder three; 5, mounting hole one; 6, mounting hole two; 7, mounting hole three; 8, flow channel one; 9, flow channel two; 10, flow channel three; 11, mounting block; 12, feed pipe opening; 13, flange seat one; 14, flange seat two; 15, flange seat three; 16, flange seat four; 17, feed port; 18, discharge port; 19, base cylinder one; 20, inner cylinder one; 21, replacement ring one; 22, screw block one; 23, replacement ring two; 24, screw block two. DETAILED DESCRIPTION

[0027] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0028] A three-layer co-extrusion head structure includes a fixing frame 1, an extrusion barrel 2, an extrusion barrel 3 and an extrusion barrel 4. The extrusion barrel 2 and the extrusion barrel 3 are tapered barrels. A mounting hole 15 and a mounting hole 26 are respectively provided on both sides of the fixing frame 1. The mounting hole 15 is a tapered hole. The extrusion barrel 2 is detachably arranged in the mounting hole 15. The extrusion barrel 23 is detachably arranged in the mounting hole 26. A mounting hole 37 is provided in the extrusion barrel 2. The extrusion barrel 34 is detachably arranged in the mounting hole 37. A flow groove 18 is provided on the surface of the extrusion barrel 2. A flow groove 29 is provided on the extrusion barrel 34. A flow groove 310 is provided on the surface of the extrusion barrel 23.

[0029] A mounting block 11 is provided between the mounting hole 1 5 and the mounting hole 2 6 . The mounting block 11 is annular and is integrally cast with the fixing frame 1 . When the extrusion cylinder 1 2 is installed in the mounting hole 1 5 , the flow groove 1 8 cooperates with the mounting block 11 to form flow channel 1 . When the extrusion cylinder 2 3 is installed in the mounting hole 2 6 , the flow groove 2 9 and the mounting block 11 form flow channel 2 . When the extrusion cylinder 3 4 is arranged in the extrusion cylinder 1 2 , the flow groove 3 10 and the inner wall of the extrusion cylinder 2 form flow channel 3 . The fixing frame 1 is also provided with three feed pipe openings 12 , which are respectively connected to flow channel 1 , flow channel 2 and flow channel 3 .

[0030] Runner three is used to form the innermost plastic. When the cable core is removed from the extruder barrel three 4, the plastic in runner two is wrapped around the cable core, and runner one forms the middle layer of plastic. When the inner plastic is wrapped, the plastic flowing out of runner one is wrapped around the outside of the inner plastic, and runner two forms the outermost plastic.

[0031] A flange seat 13 is provided at the tail of the extrusion cylinder 2, and the extrusion cylinder 2 and the mounting hole 5 are in a clearance fit. A flange seat 2 is provided at the tail of the extrusion cylinder 3 4, and the flange seat 13 is fixed to the fixing frame 1 by screws, and the flange seat 2 14 is fixed to the flange seat 13 by screws. The extrusion cylinder 3 4 and the mounting hole 3 7 are also in a clearance fit. The extrusion cylinder 2 3 is arranged on the opposite side of the extrusion cylinder 2, and a flange seat 3 15 is provided at its tail, and the flange seat 3 15 is fixed to the fixing frame 1 by screws.

[0032] Both flow channel one and flow channel three include a feed port 17 and a discharge port 18. The feed port 17 is a single flow channel, and the discharge port 18 is a double flow channel. By converting the single flow channel to a double flow channel, the pressure during extrusion is uniform and the plasticization is good, while the glue seam problem is reduced. At the same time, the flow channels can adapt to the fluidity requirements of polypropylene and polyethylene at the same time, avoiding the problems of retention and uneven flow.

[0033] The extrusion cylinder 23 includes a base cylinder 19 and an inner cylinder 20, a flange seat 4 16 is arranged at the tail of the inner cylinder 20, the inner cylinder 20 is arranged inside the base cylinder 19, the flange seat 3 15 is arranged at the tail of the base cylinder 19, the flange seat 3 15 and the flange seat 4 16 are fixed by screws, when the outer diameter of the cable needs to be changed, the inner diameter is changed by replacing the inner cylinder 20, thereby changing the diameter of the cable when extruded, and by only replacing the inner cylinder 20, the cost of making the inner cylinder is reduced and the replacement cost is reduced.

[0034] A replacement ring 21 is also provided at the extrusion end of the extrusion barrel 3 4, and the replacement ring 21 is threadedly connected to the extrusion barrel 3 4. A screw block 22 is also provided on the end face of the replacement ring 21. A replacement ring 23 is also provided in the mounting block 11, and the replacement ring 23 is threadedly connected to the mounting block 11. A screw block 24 is also provided on the end face of the replacement ring 23. The screw block 24 has the same structure as the screw block 1 22. When it is necessary to change the thickness of each layer of the cable, the replacement ring 21 and the replacement ring 23 are rotated and disassembled by screwing blocks 1 22 and 24, and the replacement ring 21 and the replacement ring 22 that meet the extrusion thickness requirements are installed back on the extrusion barrel 3 4 and the mounting block 1. By changing the inner diameter of the replacement ring 21 and the replacement ring 22, the diameter of the cable during extrusion is changed, and there is no need to disassemble and replace the larger extrusion barrel 2 and the fixing frame 1, thereby reducing the difficulty and cost of replacement.

[0035] Of course, the above are only typical examples of the present invention. In addition, the present invention may have many other specific implementations. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A three-layer co-extrusion head structure, characterized by: The invention comprises a fixing frame (1), an extrusion tube 1 (2), an extrusion tube 2 (3) and an extrusion tube 3 (4); the fixing frame (1) is provided with a mounting hole 1 (5) and a mounting hole 2 (6) on both sides thereof; the extrusion tube 1 (2) is detachably arranged in the mounting hole 1 (5); the extrusion tube 2 (3) is detachably arranged in the mounting hole 2 (6); the extrusion tube 1 (2) is provided with a mounting hole 3 (7); the extrusion tube 3 (4) is detachably arranged in the mounting hole 3 (7); a flow groove 1 (8) is provided on the surface of the extrusion tube 1 (2); a flow groove 2 (9) is provided on the surface of the extrusion tube 3 (4); and a flow groove 3 (10) is provided on the surface of the extrusion tube 2 (3).

2. A three-layer co-extrusion head structure according to claim 1, characterized in that: The tail of the extrusion tube one (2) is provided with a flange seat one (13), the tail of the extrusion tube three (4) is provided with a flange seat two (14), the flange seat one (13) is fixed to the fixing frame (1) by screws, the flange seat two (14) is fixed to the flange seat one (13) by screws, the extrusion tube two (3) is arranged on the opposite side of the extrusion tube one (2), and the tail of the extrusion tube three (15) is provided, and the flange seat three (15) is fixed to the fixing frame (1) by screws.

3. A three-layer co-extrusion head structure according to claim 2, characterized in that: A mounting block (11) is provided between the mounting hole one (5) and the mounting hole two (6); when the extrusion tube one (2) is installed in the mounting hole one (5), the flow groove one (8) and the mounting block (11) form flow channel one; when the extrusion tube two (3) is installed in the mounting hole two (6), the flow groove two (9) and the mounting block (11) form flow channel two; when the extrusion tube three (4) is arranged in the extrusion tube one (2), the flow groove three (10) and the inner wall of the extrusion tube one (2) form flow channel three; and three feed pipe openings (12) are also provided on the fixing frame (1), and the three feed pipe openings (12) are respectively connected to flow channel one, flow channel two and flow channel three.

4. A three-layer co-extrusion head structure according to claim 3, characterized in that: The flow channel one and the flow channel three both comprise a feed port (17) and a discharge port (18); the feed port (17) is a single flow channel, and the discharge port (18) is a double flow channel.

5. The three-layer co-extrusion head structure according to claim 2 is characterized in that: The extrusion cylinder 2 (3) comprises a base cylinder 1 (19) and an inner cylinder 1 (20), the tail of the inner cylinder 1 (20) is provided with a flange seat 4 (16), the inner cylinder 1 (20) is arranged inside the base cylinder 1 (19), and the flange seat 3 (15) is fixed to the flange seat 4 (16) by screws.

6. The three-layer co-extrusion head structure according to claim 1 is characterized in that: The extrusion end of the extrusion tube three (4) is also provided with a replacement ring one (21), the replacement ring one (21) is threadedly connected to the extrusion tube three (4), and the end surface of the replacement ring one (21) is also provided with a screw block one (22).

7. The three-layer co-extrusion head structure according to claim 3 is characterized in that: A second replacement ring (23) is also provided in the installation block (11). The second replacement ring (23) is threadedly connected to the installation block (11). A second screw block (24) is also provided on the end surface of the second replacement ring (23).

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