Tight tube optical fiber extrusion molding die

Abstract

The utility model provides a tight tube optical fiber extrusion forming die. Relates to the technical field of extrusion dies. The tight tube optical fiber extrusion forming die comprises a die sleeve and four extrusion heads, one extrusion head abuts against the die sleeve, an extrusion cavity is formed in the die sleeve, extrusion holes are formed in the four extrusion heads, drainage holes are formed in the four extrusion heads, and the drainage holes are communicated with the extrusion cavity. Four drainage holes are formed in the die sleeve, the four drainage holes communicate with the four extrusion holes correspondingly, the four drainage holes are all matched with the extrusion cavity, a plurality of pits are formed in the inner walls of the four extrusion holes, a connecting arm is fixedly installed on the die sleeve, an exchange shaft is rotatably installed on the connecting arm, and the exchange shaft is connected with the extrusion cavity. And a hollow fixed seat is fixedly mounted at one end of the exchange shaft. The utility model has the advantages that the corresponding extrusion heads can be quickly switched according to the production requirements of different diameters, and the use is more flexible.

Description

Technical Field

[0001] This utility model relates to the field of extrusion die technology, and in particular to a tight-fitting optical fiber extrusion molding die. Background Technology

[0002] Tight-buffered fiber is a type of optical fiber with a tight-buffered secondary coating structure. It involves directly coating a plastic material over the primary coating layer of the bare optical fiber to form a protective layer that adheres tightly to the optical fiber. Compared to loose-buffered fiber, it has stronger flexibility and protection. In the extrusion molding process of tight-buffered fiber, the optical fiber is usually passed through an extrusion die, and then the plastic coating material is extruded through the extrusion die to form tight-buffered fiber.

[0003] However, tight-buffered optical fibers have a wide range of applications, and different diameters of tight-buffered optical fibers are sometimes required in different situations. Therefore, in order to produce tight-buffered optical fibers of different diameters during extrusion molding, it is necessary to change the entire extrusion die. This changeover method is cumbersome, involves many steps, and makes it difficult to quickly switch to the production requirements of tight-buffered optical fibers of different diameters, resulting in poor flexibility.

[0004] Therefore, it is necessary to provide a new tight-buffered optical fiber extrusion die to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a flexible tight-fitting optical fiber extrusion molding die that can quickly switch between extrusion heads for different diameter production requirements.

[0006] To solve the above-mentioned technical problems, the present invention provides a tight-fitting optical fiber extrusion molding die comprising: a die sleeve and four extrusion heads, one of which abuts against the die sleeve. The die sleeve has an extrusion cavity, and each of the four extrusion heads has an extrusion hole and a drainage hole. The four drainage holes are respectively connected to the four extrusion holes, and each of the four drainage holes is adapted to the extrusion cavity. The inner walls of the four extrusion holes have multiple recesses. A connecting arm is fixedly installed on the die sleeve, and a switching shaft is rotatably installed on the connecting arm. A hollow fixing seat is fixedly installed at one end of the switching shaft, and a cross connecting strip is slidably installed on the hollow fixing seat. The four ends of the cross connecting strip are detachably connected to the four extrusion heads.

[0007] Preferably, each of the four ends of the cross connecting strip is provided with a front groove, and each of the four front grooves is fixedly installed with a support head by countersunk bolts. One side of each of the four support heads is fixedly connected to the four extrusion heads respectively.

[0008] Preferably, a first tightening screw is threaded onto the side of the hollow fixing seat away from the connecting arm, and the end of the first tightening screw passes through the cross connecting bar and is rotatably connected to the cross connecting bar.

[0009] Preferably, the hollow fixing base has a first limiting slide opening on each of its four sides, and the cross connecting strip passes through the four first limiting slide openings and contacts the inner wall of the four first limiting slide openings.

[0010] Preferably, two circular sleeves are fixedly fitted on the switching shaft, and the connecting arm is located between the two circular sleeves. Four adjustment holes are arranged in a ring array on the outer ring wall of each of the two circular sleeves. A through groove is provided on the connecting arm, and a horizontal straight plate is slidably installed on the connecting arm. The horizontal straight plate passes through the through groove. A second tightening screw is threaded on the top of the connecting arm. The bottom end of the second tightening screw extends into the through groove and is rotatably connected to the horizontal straight plate. Two clamps are fixedly installed on the bottom of the horizontal straight plate, and the bottom ends of the two clamps extend into the corresponding adjustment holes.

[0011] Preferably, a second limiting slide opening is provided on both sides of the connecting arm, and both second limiting slide openings are connected to the through groove. The horizontal straight plate passes through the two second limiting slide openings and contacts the inner wall of the two second limiting slide openings.

[0012] Compared with related technologies, the tight-fitting optical fiber extrusion molding die provided by this utility model has the following beneficial effects:

[0013] This utility model provides a tight-fitting optical fiber extrusion molding die. By setting four extrusion heads of different specifications on the cross connecting bar, different extrusion heads can be quickly switched during the extrusion molding process by rotating the first tightening screw and the second tightening screw. This method is more flexible and can also improve the efficiency of extrusion molding. In addition, the extrusion head and the cross connecting bar are detachably connected, and other commonly used specifications and sizes of extrusion heads can be replaced according to actual needs, further improving the flexibility of use. Attached Figure Description

[0014] Figure 1 A schematic diagram of a preferred embodiment of the tight-fitting optical fiber extrusion molding die provided by this utility model;

[0015] Figure 2 This is a cross-sectional view of the die sleeve, extrusion head, and connecting arm in this utility model.

[0016] Figure 3 This is a schematic diagram of the through groove in this utility model;

[0017] Figure 4 This is a schematic diagram of the connection structure between the extrusion head and the support head in this utility model;

[0018] Figure 5 This is a schematic diagram of the connection structure between the hollow fixing base and the cross connecting strip in this utility model;

[0019] Figure 6 This is a cross-sectional view of the hollow fixing base of this utility model.

[0020] The following are the labels in the diagram: 1. Mold sleeve; 2. Extrusion cavity; 3. Connecting arm; 4. Adjustment shaft; 5. Hollow fixing seat; 6. Cross connecting strip; 7. Extrusion head; 8. Extrusion hole; 9. Drain hole; 10. Recess; 11. Front groove; 12. Support head; 13. First tightening screw; 14. Round sleeve; 15. Adjustment hole; 16. Through groove; 17. Second tightening screw; 18. Horizontal straight plate; 19. Clamping head. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Please refer to the following: Figures 1-6 The tight-fitting optical fiber extrusion molding die includes: a die sleeve 1 and four extrusion heads 7, one of which abuts against the die sleeve 1 and has an extrusion cavity 2 for extruding molten plastic. Each of the four extrusion heads 7 has an extrusion hole 8 and a drainage hole 9, which are connected to the four extrusion holes 8 respectively. The four drainage holes 9 are adapted to the extrusion cavity 2, forming an extrusion flow direction through the extrusion cavity 2, the drainage hole 9, and the extrusion hole 8. The inner wall of each of the four extrusion holes 8 has multiple recesses 10, which can form stripes on the outer surface during extrusion to improve wear resistance. A connecting arm 3 is fixedly installed on the die sleeve 1, and a switching shaft 4 is rotatably installed on the connecting arm 3. A hollow fixing seat 5 is fixedly installed at one end of the switching shaft 4, and a cross connecting stripe 6 is slidably installed on the hollow fixing seat 5. The four ends of the cross connecting stripe 6 are detachably connected to the four extrusion heads 7 respectively, and different extrusion heads 7 can be quickly switched by rotating the cross connecting stripe 6.

[0023] In the above method, the detachable connection between the cross connecting strip 6 and the extrusion head 7 is achieved by providing front grooves 11 on each of the four ends of the cross connecting strip 6. Each of the four front grooves 11 is fixedly installed with a support head 12 by countersunk bolts. The countersunk bolts are not shown in the figure. One side of each of the four support heads 12 is fixedly connected to the four extrusion heads 7. When replacing the extrusion head 7, the countersunk bolts can be unscrewed for replacement.

[0024] In this method, in order to ensure that the extrusion head 7 and the die sleeve 1 fit tightly together, a first tightening screw 13 is threadedly installed on the side of the hollow fixed base 5 away from the connecting arm 3. The end of the first tightening screw 13 passes through the cross connecting bar 6 and is rotatably connected to the cross connecting bar 6. In order to ensure that the cross connecting bar 6 performs stable linear movement, a first limiting slide is provided on each of the four sides of the hollow fixed base 5. The cross connecting bar 6 passes through the four first limiting slides and contacts the inner wall of the four first limiting slides, thereby forming a limiting function.

[0025] In this method, in order to temporarily fix the rotated replacement shaft 4, two circular sleeves 14 are fixedly sleeved on the replacement shaft 4. The connecting arm 3 is located between the two circular sleeves 14. Four adjusting holes 15 arranged in a circular array are opened on the outer wall of each of the two circular sleeves 14. A through groove 16 is opened on the connecting arm 3. A horizontal straight plate 18 is slidably installed on the connecting arm 3, passing through the through groove 16. A second tightening screw 17 is threaded onto the top of the connecting arm 3, and the bottom end of the second tightening screw 17 extends into the through groove 16. The horizontal straight plate 18 is rotatably connected to the horizontal straight plate 18. Two clips 19 are fixedly installed at the bottom of the horizontal straight plate 18. The bottom ends of the two clips 19 extend into the corresponding adjustment holes 15. The sliding method between the connecting arm 3 and the horizontal straight plate 18 mentioned above is that a second limiting slide is opened on both sides of the connecting arm 3. The two second limiting slides are connected to the through groove 16. The horizontal straight plate 18 passes through the two second limiting slides and contacts the inner wall of the two second limiting slides to form a limiting function, so that the horizontal straight plate 18 can only move in a straight line.

[0026] The working principle of the tight-fitting optical fiber extrusion molding die provided by this utility model is as follows:

[0027] The four extrusion heads 7 on this molding die are of commonly used size and can meet normal processing needs. Different specifications of extrusion heads 7 can also be replaced according to actual needs.

[0028] During extrusion molding, the optical fiber is first passed through the die sleeve 1 and the corresponding extrusion head 7. Then, the molten plastic enters the extrusion chamber 2 for extrusion. During the extrusion process, the optical fiber can be wrapped to form a tight-fitting optical fiber. In addition, the design of the recess 10 can form filaments on the outer surface to increase wear resistance.

[0029] In subsequent use, when it is necessary to temporarily switch the extrusion head 7 to extrude tight-buffered optical fibers of different diameters, simply turn the first tightening screw 13 counterclockwise to separate the extrusion head 7 from the mold sleeve 1. Then, turn the second tightening screw 17 counterclockwise. The horizontal plate 18 will rise with the two clamps 19 and eventually separate from the corresponding adjustment hole 15. Then, rotate the cross connecting bar 6 until the specified extrusion head 7 is rotated to correspond to the axis of the mold sleeve 1. Then, turn the second tightening screw 17 clockwise to bring the two clamps 19 into the corresponding adjustment hole 15. Then, turn the first tightening screw 13 clockwise to make the extrusion head 7 fit tightly with the mold sleeve 1. Then, the extrusion molding work can continue.

[0030] Compared with related technologies, the tight-fitting optical fiber extrusion molding die provided by this utility model has the following beneficial effects:

[0031] This utility model provides a tight-fitting optical fiber extrusion molding die. By setting four extrusion heads 7 of different specifications on the cross connecting bar 6, different extrusion heads 7 can be quickly switched for molding work by rotating the first tightening screw 13 and the second tightening screw 17 during the extrusion molding process. This method is more flexible and can also improve the efficiency of extrusion molding. In addition, the extrusion head 7 is detachably connected to the cross connecting bar 6, and other commonly used specifications and sizes of extrusion heads 7 can be replaced according to actual needs, further improving the flexibility of use.

[0032] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A tight-fitting optical fiber extrusion die, comprising a die sleeve and four extrusion heads, wherein one of the extrusion heads abuts against the die sleeve, characterized in that, The die sleeve has an extrusion cavity, and each of the four extrusion heads has an extrusion hole and a drainage hole. The four drainage holes are connected to the four extrusion holes and are adapted to the extrusion cavity. The inner walls of the four extrusion holes have multiple recesses. A connecting arm is fixedly installed on the die sleeve, and a switching shaft is rotatably installed on the connecting arm. A hollow fixing seat is fixedly installed at one end of the switching shaft, and a cross connecting strip is slidably installed on the hollow fixing seat. The four ends of the cross connecting strip are detachably connected to the four extrusion heads.

2. The tight-fitting optical fiber extrusion die according to claim 1, characterized in that, The four ends of the cross-shaped connecting strip are provided with front grooves, and each of the four front grooves is fixedly installed with a support head by countersunk bolts. One side of each of the four support heads is fixedly connected to the four extrusion heads.

3. The tight-fitting optical fiber extrusion die according to claim 1, characterized in that, A first tightening screw is threaded onto the side of the hollow fixing seat away from the connecting arm. The end of the first tightening screw passes through the cross connecting bar and is rotatably connected to the cross connecting bar.

4. The tight-fitting optical fiber extrusion die according to claim 3, characterized in that, The hollow fixing base has a first limiting slide opening on each of its four sides. The cross connecting strip passes through the four first limiting slide openings and contacts the inner wall of the four first limiting slide openings.

5. The tight-fitting optical fiber extrusion die according to claim 1, characterized in that, Two circular sleeves are fixedly fitted on the switching shaft. The connecting arm is located between the two circular sleeves. Four adjustment holes are arranged in a ring array on the outer ring wall of each of the two circular sleeves. A through groove is provided on the connecting arm. A horizontal straight plate is slidably installed on the connecting arm. The horizontal straight plate passes through the through groove. A second tightening screw is threaded on the top of the connecting arm. The bottom end of the second tightening screw extends into the through groove and is rotatably connected to the horizontal straight plate. Two clamps are fixedly installed on the bottom of the horizontal straight plate. The bottom ends of the two clamps extend into the corresponding adjustment holes.

6. The tight-fitting optical fiber extrusion die according to claim 5, characterized in that, The connecting arm has a second limiting slide opening on both sides. Both second limiting slide openings are connected to the through groove, and the horizontal straight plate passes through the two second limiting slide openings and contacts the inner wall of the two second limiting slide openings.

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