Cable insulation sheath co-extrusion die

Abstract

The invention discloses a cable insulation sheath co-extrusion die, and relates to the technical field of cable processing, the cable insulation sheath co-extrusion die comprises a wire core channel cylinder and an extrusion channel cylinder, the wire core channel cylinder is slidably sleeved with the extrusion channel cylinder, and a sheath thickness adjusting assembly is arranged between one side of the upper end of the extrusion channel cylinder and one side of the upper end of the wire core channel cylinder; an outer sleeve extrusion part is arranged on the other side of the extrusion channel barrel, a cooling part is arranged at the lower end of the extrusion channel barrel, a sheath tightness adjusting assembly is arranged at the lower end of the cooling part, an inner sleeve extrusion opening is formed in one side of the extrusion channel barrel, and an inner sleeve extrusion runner is formed between the extrusion channel barrel and the outer wall of the wire core channel barrel. According to the cable insulation sheath co-extrusion die, the size of an extruded runner can be adjusted during extrusion, so that the thickness of an extruded sheath can be adjusted when different types of cable sheaths are processed, different types of co-extrusion dies do not need to be replaced, and the application range of the co-extrusion die is widened.

Description

Technical Field

[0001] This invention relates to the field of cable processing technology, specifically to a co-extrusion die for cable insulation sheaths. Background Technology

[0002] Cable insulation sheaths generally use a double-layer sheath, with the inner layer serving as the main protective layer and the outer layer serving as the color-coded layer. This is the preferred extrusion method for many export cables.

[0003] Chinese Patent Publication No. CN114974748A discloses a double-layer co-extrusion die for a nylon sheath and an outer sheath, relating to the field of cable processing equipment technology. This double-layer co-extrusion die includes: a double-layer co-extrusion die core and a general-purpose distributor. The general-purpose distributor is sleeved on the outside of the double-layer co-extrusion die core, and a nylon extrusion channel is formed between the general-purpose distributor and the double-layer co-extrusion die core. The front end of the double-layer co-extrusion die core penetrates the general-purpose distributor and extends into the interior of the double-layer co-extrusion die sleeve. A double-layer co-extrusion die sleeve is sleeved on the outside of the general-purpose distributor and the double-layer co-extrusion die core. An outer sheath extrusion channel is formed between the double-layer co-extrusion die sleeve and the general-purpose distributor. The front end of the interior of the double-layer co-extrusion die sleeve forms a double-layer co-extrusion channel through the nylon extrusion channel and the outer sheath extrusion channel. This design can achieve double-layer co-extrusion of the nylon sheath and outer sheath in one operation. The operation is simple, not only improving product quality but also reducing die manufacturing costs.

[0004] However, in the prior art, the co-extrusion die used in the prior art produces a single sheath thickness during extrusion, making it impossible to adjust the thickness of the extruded sheath. As a result, when different types of cable sheaths need to be processed, different models of co-extrusion dies are required, which reduces the applicability of the co-extrusion die. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a co-extrusion die for cable insulation sheaths, which solves the problem that existing co-extrusion dies cannot adjust the thickness of the extruded sheath during extrusion.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a co-extrusion die for cable insulation sheaths, comprising a core channel cylinder and an extrusion channel cylinder, wherein the extrusion channel cylinder is slidably sleeved outside the core channel cylinder, a sleeve thickness adjustment component is provided between one upper end of the extrusion channel cylinder and one upper end of the core channel cylinder, and an outer extrusion member is provided on the other side of the extrusion channel cylinder, a cooling component is provided at the lower end of the extrusion channel cylinder, and a sheath tightness adjustment component is provided at the lower end of the cooling component, an inner sleeve extrusion port is provided on one side of the extrusion channel cylinder, and an inner sleeve extrusion flow channel is formed between the extrusion channel cylinder and the outer wall of the core channel cylinder.

[0007] The sleeve thickness adjustment assembly includes a limiting block disposed on one side of the upper end of the core channel cylinder and a limiting seat disposed on one side of the upper end of the extrusion channel cylinder. A first knob is rotatably mounted on the bottom of the limiting seat, and a first screw is connected to the upper end of the first knob. A threaded sleeve adapted to the first screw is disposed at the bottom of the limiting block, and the threaded sleeve is screwed onto the outside of the first screw.

[0008] Furthermore, the outer extrusion part includes a fixing block disposed on the other side of the extrusion channel cylinder, and an outer extrusion channel is provided on one side of the fixing block, the outer extrusion channel being connected to the interior of the inner extrusion channel.

[0009] Furthermore, a groove is provided inside the fixing block at a position above the outer extrusion channel, a stop block is slidably installed inside the groove, a second knob is rotatably installed on the upper part of the fixing block, and a second screw is connected to the lower end of the second knob.

[0010] Furthermore, the upper part of the stop block is provided with a threaded hole that matches the second screw, and the second screw is screwed into the inside of the threaded hole.

[0011] Furthermore, the cooling component includes a cooling cylinder disposed at the lower end of the extrusion channel cylinder, the cooling cylinder having a cooling channel inside, and a water inlet disposed on one side of the upper end of the cooling cylinder, and a water outlet disposed on the other side of the lower end of the cooling cylinder.

[0012] Furthermore, the lower ends of both the core channel tube and the extrusion channel tube are conical, and the lower end of the core channel tube is located inside the lower end of the extrusion channel tube.

[0013] Furthermore, the sheath tight adjustment assembly includes a limiting cylinder, an airbag cushion sleeve is provided on the inner wall of the limiting cylinder, and an air pump is installed on one side of the limiting cylinder. The output end of the air pump is connected to an air supply pipe, and the other end of the air supply pipe is connected to the airbag cushion sleeve.

[0014] Furthermore, when the airbag cushion is not inflated, the inner diameter of the airbag cushion is larger than the outer diameter of the outer cover; when the airbag cushion is inflated, the inner diameter of the airbag cushion is smaller than the outer diameter of the outer cover.

[0015] Beneficial effects

[0016] This invention provides a co-extrusion die for cable insulation sheaths, which has the following advantages compared with the prior art:

[0017] 1. The co-extrusion die for cable insulation sheath can adjust the size of the extrusion channel during extrusion, thereby adjusting the thickness of the extruded sheath when processing sheaths of different cable models without the need to change to different models of co-extrusion dies, thus improving the applicability of the co-extrusion die.

[0018] 2. The co-extrusion die for the cable insulation sheath can quickly cool the sheath during extrusion, thereby enabling the sheath to be quickly shaped and less prone to deformation.

[0019] 3. The co-extrusion mold for the cable insulation sheath allows for more compact shaping of the sheath after cooling and setting. By inflating the air bladder sleeve, the air bladder sleeve compresses the sheath, thereby improving the quality of the sheath processing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the thickness adjustment component of the present invention;

[0022] Figure 3 This is a schematic diagram of the extrusion channel cylinder of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the outer extrusion part and the cooling part of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the sheath tight adjustment component of the present invention.

[0025] In the diagram: 1. Core channel cylinder; 2. Extrusion channel cylinder; 3. Sheath thickness adjustment assembly; 31. Limiting block; 32. Limiting seat; 33. First knob; 34. First screw; 35. Threaded sleeve; 4. Outer extruder; 41. Fixing block; 42. Outer extrusion channel; 43. Groove; 44. Stop block; 45. Second knob; 46. Second screw; 5. Cooling component; 51. Cooling cylinder; 52. Cooling channel; 53. Inlet; 54. Outlet; 6. Sheath tightness adjustment assembly; 61. Limiting cylinder; 62. Airbag cushion; 63. Air pump; 64. Air supply pipe; 7. Inner sleeve extrusion port; 8. Inner sleeve extrusion channel. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figure 1-5 This invention provides four technical solutions:

[0028] Example 1

[0029] Please see Figure 1 and Figure 4In this embodiment of the invention, a co-extrusion mold for cable insulation sheath includes a core channel cylinder 1 and an extrusion channel cylinder 2. The extrusion channel cylinder 2 is slidably sleeved outside the core channel cylinder 1. A sleeve thickness adjustment component 3 is provided between one upper end of the extrusion channel cylinder 2 and one upper end of the core channel cylinder 1. An outer extruder 4 is provided on the other side of the extrusion channel cylinder 2. A cooling component 5 is provided at the lower end of the extrusion channel cylinder 2. A sheath tightness adjustment component 6 is provided at the lower end of the cooling component 5. An inner sleeve extrusion port 7 is provided on one side of the extrusion channel cylinder 2. An inner sleeve extrusion channel 8 is formed between the extrusion channel cylinder 2 and the outer wall of the core channel cylinder 1. The lower ends of both the core channel cylinder 1 and the extrusion channel cylinder 2 are conical, and the lower end of the core channel cylinder 1 is located inside the lower end of the extrusion channel cylinder 2, so that the extruded raw material can adhere to the cable core to form a sheath.

[0030] Please see Figure 2 In this embodiment of the invention, the sleeve thickness adjustment component 3 includes a limiting block 31 disposed on one side of the upper end of the core channel cylinder 1 and a limiting seat 32 disposed on one side of the upper end of the extrusion channel cylinder 2. A first knob 33 is rotatably mounted on the bottom of the limiting seat 32. A first screw 34 is connected to the upper end of the first knob 33. A threaded sleeve 35 adapted to the first screw 34 is disposed at the bottom of the limiting block 31. The threaded sleeve 35 is screwed to the outside of the first screw 34. By adjusting the first screw 34, the inner sleeve thickness of the sheath can be adjusted.

[0031] Example 2 differs from Example 1 in that:

[0032] Please see Figure 3-4 In this embodiment of the invention, the outer extrusion part 4 includes a fixing block 41 disposed on the other side of the extrusion channel cylinder 2. An outer extrusion channel 42 is disposed on one side of the fixing block 41. The outer extrusion channel 42 is connected to the interior of the inner extrusion channel 8. Raw material is introduced into the outer extrusion channel 42 to form a sheath.

[0033] Please see Figure 3-4 In this embodiment of the invention, a groove 43 is provided inside the fixing block 41 at a position above the outer sleeve extrusion channel 42. A stop block 44 is slidably installed inside the groove 43. A second knob 45 is rotatably installed on the upper part of the fixing block 41. A second screw 46 is connected to the lower end of the second knob 45. A threaded hole adapted to the second screw 46 is provided on the upper part of the stop block 44. The second screw 46 is screwed into the threaded hole. The outer sleeve thickness of the sheath can be adjusted by adjusting the second screw 46.

[0034] Example 3 differs from Examples 1 and 2 in that:

[0035] Please see Figure 4In this embodiment of the invention, the cooling component 5 includes a cooling cylinder 51 disposed at the lower end of the extrusion channel cylinder 2. The cooling cylinder 51 is provided with a cooling channel 52 inside, and a water inlet 53 is provided on one side of the upper end of the cooling cylinder 51, and a water outlet 54 is provided on the other side of the lower end of the cooling cylinder 51, so as to cool the sheath and make it quickly set.

[0036] Example 4 differs from Examples 1, 2, and 3 in that:

[0037] Please see Figure 5 In this embodiment of the invention, the sheath tight adjustment component 6 includes a limiting cylinder 61, an airbag pad 62 is provided on the inner wall of the limiting cylinder 61, and an air pump 63 is installed on one side of the limiting cylinder 61. The output end of the air pump 63 is connected to an air supply pipe 64, and the other end of the air supply pipe 64 is connected to the airbag pad 62. When the airbag pad 62 is not inflated, the inner diameter of the airbag pad 62 is larger than the outer diameter of the outer sheath. After the airbag pad 62 is inflated, the inner diameter of the airbag pad 62 is smaller than the outer diameter of the outer sheath. By inflating the airbag pad 62, the airbag pad 62 will bulge, thereby squeezing the outside of the sheath, making the connection between the inner and outer sheaths tighter, so that deformation and delamination are less likely to occur.

[0038] Working principle: The cable core is passed through the inside of the core channel cylinder 1, and then the inner sleeve extrusion port 7 on the extrusion channel cylinder 2 is connected to the extruder outlet, and the outer sleeve extrusion channel 42 on the fixing block 41 is connected to the extruder outlet.

[0039] Rotating the first knob 33 drives the first screw 34 to rotate, which in turn drives the threaded sleeve 35 to move. The threaded sleeve 35 then drives the core channel cylinder 1 to move, changing the distance between the outer wall of the lower end of the core channel cylinder 1 and the inner wall of the lower end of the extrusion channel cylinder 2. This allows adjustment of the distance below the inner sleeve extrusion channel 8. When inner sleeve raw material is introduced into the inner sleeve extrusion port 7, the raw material enters the inner sleeve extrusion channel 8 and then adheres to the outside of the cable core. As the distance below the inner sleeve extrusion channel 8 is continuously adjusted, the thickness of the inner sleeve also changes, thus enabling the processing of different types of cable sheaths.

[0040] Rotating the second knob 45 drives the second screw 46 to rotate, and the second screw 46 drives the stop block 44 to move, adjusting the distance between the stop block 44 and the outer sleeve extrusion channel 42, thereby adjusting the size of the outer sleeve extrusion channel 42. The outer sleeve material is then introduced into the outer sleeve extrusion channel 42, and the outer sleeve material adheres to the inner sleeve to form the outer sleeve. The thickness of the outer sleeve changes with the size of the outer sleeve extrusion channel 42.

[0041] After the inner and outer sheaths are attached to the cable core, they form a sheath. When the sheath passes through the cooling cylinder 51, cold water is introduced into the water inlet 53. The cold water enters the cooling channel 52, which can cool the sheath and make the sheath quickly set.

[0042] When the sheath passes through the limiting cylinder 61, it will pass through the inside of the airbag pad 62. Then the air pump 63 will inflate the airbag pad 62, causing the airbag pad 62 to bulge and squeeze the outside of the sheath, making the connection between the inner and outer sleeves tighter and thus less prone to deformation or delamination.

[0043] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

Claims

1. A co-extrusion die for cable insulation sheath, comprising a core channel cylinder (1) and an extrusion channel cylinder (2), characterized in that: The extrusion channel cylinder (2) is slidably sleeved outside the core channel cylinder (1). A sleeve thickness adjustment component (3) is provided between the upper end of the extrusion channel cylinder (2) and the upper end of the core channel cylinder (1). An outer extrusion component (4) is provided on the other side of the extrusion channel cylinder (2). A cooling component (5) is provided at the lower end of the extrusion channel cylinder (2). A sheath tightness adjustment component (6) is provided at the lower end of the cooling component (5). An inner sleeve extrusion port (7) is provided on one side of the extrusion channel cylinder (2). An inner sleeve extrusion channel (8) is formed between the extrusion channel cylinder (2) and the outer wall of the core channel cylinder (1). The sleeve thickness adjustment assembly (3) includes a limiting block (31) disposed on one side of the upper end of the core channel cylinder (1) and a limiting seat (32) disposed on one side of the upper end of the extrusion channel cylinder (2). A first knob (33) is rotatably mounted on the bottom of the limiting seat (32). A first screw (34) is connected to the upper end of the first knob (33). A threaded sleeve (35) adapted to the first screw (34) is disposed at the bottom of the limiting block (31). The threaded sleeve (35) is screwed to the outside of the first screw (34).

2. The co-extrusion die for cable insulation sheath according to claim 1, characterized in that: The outer extrusion part (4) includes a fixing block (41) disposed on the other side of the extrusion channel cylinder (2), and an outer extrusion channel (42) is provided on one side of the fixing block (41), which is connected to the interior of the inner extrusion channel (8).

3. The co-extrusion die for cable insulation sheath according to claim 2, characterized in that: The fixed block (41) has a groove (43) located above the outer extrusion channel (42) inside. A stop block (44) is slidably installed inside the groove (43). A second knob (45) is rotatably installed on the upper part of the fixed block (41). A second screw (46) is connected to the lower end of the second knob (45).

4. The co-extrusion die for cable insulation sheath according to claim 3, characterized in that: The upper part of the stop block (44) is provided with a threaded hole that is compatible with the second screw (46), and the second screw (46) is screwed into the inside of the threaded hole.

5. The co-extrusion die for cable insulation sheath according to claim 1, characterized in that: The cooling component (5) includes a cooling cylinder (51) disposed at the lower end of the extrusion channel cylinder (2). The cooling cylinder (51) has a cooling channel (52) inside, and a water inlet (53) is disposed on one side of the upper end of the cooling cylinder (51), and a water outlet (54) is disposed on the other side of the lower end of the cooling cylinder (51).

6. The co-extrusion die for cable insulation sheath according to claim 1, characterized in that: The lower ends of both the core channel tube (1) and the extrusion channel tube (2) are conical, and the lower end of the core channel tube (1) is located inside the lower end of the extrusion channel tube (2).

7. The co-extrusion die for cable insulation sheath according to claim 1, characterized in that: The sheath tight adjustment assembly (6) includes a limiting cylinder (61), an airbag cushion (62) is provided on the inner wall of the limiting cylinder (61), and an air pump (63) is installed on one side of the limiting cylinder (61). The output end of the air pump (63) is connected to an air supply pipe (64), and the other end of the air supply pipe (64) is connected to the airbag cushion (62).

8. The co-extrusion die for cable insulation sheath according to claim 7, characterized in that: When the airbag cushion (62) is not inflated, the inner diameter of the airbag cushion (62) is larger than the outer diameter of the outer cover. When the airbag cushion (62) is inflated, the inner diameter of the airbag cushion (62) is smaller than the outer diameter of the outer cover.

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