High-temperature-resistant cable extrusion die

Abstract

The utility model discloses a high-temperature-resistant cable extrusion die, which relates to the technical field of cable manufacture and comprises a die head, a first cavity is arranged on the die head, a die core and a die sleeve are respectively sleeved at two ends of the first cavity, and a second cavity is arranged on the die sleeve. A plurality of first threaded holes are formed in the outer circumferential surfaces of the two sides of the die sleeve in the axis direction of the second cavity, second threaded holes corresponding to the first threaded holes are formed in the die head, first adjusting bolts are in threaded connection with the interiors of the second threaded holes, the threaded ends of the first adjusting bolts penetrate through the second threaded holes to be in threaded connection with the first threaded holes, and a third cavity is formed in the die core. A plurality of third threaded holes are formed in the outer circumferential surfaces of the two ends, in the axis direction of the third cavity, of the mold core, fourth threaded holes corresponding to the third threaded holes are formed in the mold head, second adjusting bolts are in threaded connection with the interiors of the fourth threaded holes, and the threaded ends of the second adjusting bolts penetrate through the fourth threaded holes to be in threaded connection with the third threaded holes; the device has the characteristic of improving the cable manufacturing quality.

Description

Technical Field

[0001] The utility model relates to the technical field of cable manufacturing, in particular to a high-temperature resistant cable extrusion die. Background Technique

[0002] In the production process of cables, to ensure the safe use of cables, extrusion equipment is needed to coat the cables with insulating layers, that is, a screw with a specific shape is rotated in a heated barrel to squeeze the plastic sent from the hopper forward, so that the plastic is evenly melted, and through the head and dies with different shapes, the plastic is extruded into continuous plastic layers of various required shapes and extruded onto the wire core and cables.

[0003] The extrusion die mainly includes a die head and a die sleeve and a die core sleeved inside the die head. According to the different combinations of the die sleeve and the die core, it is divided into three types: extrusion type, extrusion tube type, and semi-extrusion tube (semi-extrusion) type, but their working principles are similar. In production, the production process and the matching effect of the die core and the die sleeve directly affect the thickness and uniformity of the cable finished product, and directly affect the quality of the cable finished product. At present, most of the commonly used and widely used die cores and die sleeves in production are directly assembled with the die head through threads. There is no contact between the die core and the die sleeve, and only the concentricity of the assembly is ensured through the threads. At the same time, after long-term use, there will be a small gap between the die sleeve and the die core and the die head, resulting in inaccurate concentricity and low precision reliability, and the concentricity of the die sleeve and the die core cannot be adjusted.

[0004] A heat tracing cable extrusion die with automatic concentricity adjustment, with the publication number of CN213860569U, includes a die head body and a die core body and a die sleeve body inserted on both sides of the die head body. One end of the die core body is inserted inside the die sleeve body. The die sleeve body is provided with a positioning groove corresponding to the end face of the die core body. The die core body is provided with a positioning post inserted inside the positioning groove at the position corresponding to the positioning groove, and a compression spring supporting the end of the positioning post is arranged inside the positioning groove. A jack is arranged at the end of the positioning post, and a through hole is arranged at the position of the die sleeve body corresponding to the positioning post.

[0005] By providing a positioning groove, a positioning post, a guiding rib, a guiding groove and a threaded sleeve, the device aligns the guiding rib with the guiding groove to install the die sleeve body into the die head body, aligns the guiding rib with the guiding groove to install the die core body into the die head body, and the positioning post and the positioning groove achieve the coaxial effect of the die core body and the die sleeve body. Although the die sleeve and the die core are integrally connected through the positioning post and the positioning groove, during the process that the molten material of the cable enters the die sleeve to coat and form the cable metal wire core, it will cause a high-temperature expansion effect on the positioning post. Under the long-term operating state, the positioning post is prone to deformation under the state of high temperature and high pressure, resulting in the displacement at the connection between the die sleeve and the die core, thereby making the concentricity between the die sleeve and the die core inconsistent, and further affecting the quality of the cable coating and forming. Therefore, it is necessary to design a high-temperature resistant cable extrusion die to improve the cable forming quality. Summary of the Invention

[0006] The purpose of the present invention is to provide a high-temperature resistant cable extrusion die aiming at the existing technical defects to solve the problems proposed in the above background technology.

[0007] To solve the above technical problems, the present invention provides the following technical solution: A high-temperature resistant cable extrusion die, including a die head, a cavity one is opened on the die head, a die core and a die sleeve are respectively sleeved at both ends of the cavity one, a cavity two is opened on the die sleeve, a plurality of threaded holes one are opened on the outer circumferential surface of both sides of the die sleeve along the axial direction of the cavity two, a threaded hole two is opened on the die head corresponding to the threaded hole one, an adjusting bolt one is screwed in the threaded hole two, and the threaded end of the adjusting bolt one penetrates through the threaded hole two and is screwed with the threaded hole one. A cavity three is opened on the die core, a plurality of threaded holes three are opened on the outer circumferential surface of both ends of the die core along the axial direction of the cavity three, a threaded hole four is opened on the die head corresponding to the threaded hole three, an adjusting bolt two is screwed in the threaded hole four, and the threaded end of the adjusting bolt two penetrates through the threaded hole four and is screwed with the threaded hole three.

[0008] The present invention further explains that a plurality of limiting grooves are opened at both ends of the inner wall of the cavity one along the axial direction, and limiting strips are fixedly connected to the outer circumferential surfaces of the die core and the die sleeve corresponding to the limiting grooves.

[0009] The present invention further explains that the number of the threaded holes one and the threaded holes three is not less than four, and a plurality of the threaded holes one are circumferentially and uniformly distributed with the axis of the cavity two as the center, and a plurality of the threaded holes three are circumferentially and uniformly distributed with the axis of the cavity three as the center.

[0010] The present invention further explains that the threaded holes one and the threaded holes three are arranged in a staggered manner with the limiting grooves, the threaded holes one at both ends of the die sleeve are arranged oppositely, the threaded holes three at both ends of the die core are arranged oppositely, and the threaded holes one and the threaded holes three are arranged oppositely.

[0011] The present utility model is further described as follows. The number of limiting grooves opened at one end of the first cavity along the axial direction is not less than three, and several of the limiting grooves are evenly distributed in a circle with the center of the first cavity as the center of the circle. The limiting grooves at both ends of the first cavity are symmetrically arranged with the center point of the first cavity as the reference.

[0012] The present utility model is further described as follows. The cross-section of the second cavity along the axial direction and on the side close to the center of the first cavity is in the shape of a funnel transversely arranged. One end of the mold core inserted at the center of the first cavity is sleeved in the second cavity. The cross-sectional shape of the part of the mold core sleeved in the mold sleeve along the axial direction of the third cavity is in the shape of a funnel transversely arranged. The mold sleeve and the mold core cooperate to form an annular flow channel at the center of the first cavity.

[0013] The present utility model is further described as follows. The die head is provided with a feed port corresponding to the annular flow channel, and the feed port is communicated with the output end of the cable extruder.

[0014] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows: In the present utility model, by arranging limiting grooves in the first cavity and limiting strips on the mold sleeve and the die head, the limiting strips and the limiting grooves cooperate to play a role in limiting and positioning the subsequent installation of the mold sleeve, the mold core and the die head.

[0015] By opening a first threaded hole on the mold sleeve and a third threaded hole on the mold core, and opening a second threaded hole and a fourth threaded hole on the die head corresponding to the first threaded hole and the third threaded hole, and connecting and fixing the die head with the mold sleeve and the mold core by cooperating with a first adjusting bolt and a second adjusting bolt. At the same time, the concentricity of the mold sleeve and the mold core is finely adjusted by the first adjusting bolt and the second adjusting bolt. The adjustment method is convenient and can be adjusted in real time during the cable production process, improving the production quality and efficiency of cable extrusion. Description of the Drawings

[0016] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0017] Figure 1 is the front view sectional structure schematic diagram of the overall structure of the present utility model;

[0018] Figure 2 is the top view sectional structure schematic diagram of the overall structure of the present utility model;

[0019] In the figure: 1. Die head; 2. First cavity; 3. Die core; 4. Die sleeve; 5. Limit groove; 6. Limit strip; 7. Second cavity; 8. First threaded hole; 9. Second threaded hole; 10. First adjusting bolt; 11. Third cavity; 12. Annular flow channel; 13. Third threaded hole; 14. Fourth threaded hole; 15. Second adjusting bolt; 16. First annular groove; 17. Second annular groove. Specific embodiments

[0020] The following further non - restrictive detailed description of the technical solution of the present utility model is made in conjunction with the preferred embodiments and their accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of them. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present utility model.

[0021] Please refer to Figure 1-2 , the present utility model provides a technical solution: A high - temperature - resistant cable extrusion die, including a die head 1, on which a first cavity 2 is opened. The first cavity 2 is cylindrical, both ends of the first cavity 2 penetrate through the die head 1, and a die core 3 and a die sleeve 4 are respectively sleeved at both ends of the first cavity 2.

[0022] At both ends of the inner wall of the first cavity 2 along the axial direction, a plurality of limit grooves 5 are opened. Correspondingly, on the outer circumferential surfaces of the die core 3 and the die sleeve 4 corresponding to the limit grooves 5, limit strips 6 are fixedly connected. The limit strips 6 and the limit grooves 5 cooperate to limit the die sleeve 4 and the die core 3.

[0023] Specifically, the number of limit grooves 5 opened at one end of the first cavity 2 along the axial direction is not less than three, and a plurality of limit grooves 5 are evenly distributed in a circle with the axis of the first cavity 2 as the center. The limit grooves 5 at both ends of the first cavity 2 are symmetrically arranged with the center point of the first cavity 2 as the reference.

[0024] At the center of the die sleeve 4, a second cavity 7 is opened along the axial direction. The cross - section of the second cavity 7 along the axial direction and on the side close to the center of the first cavity 2 is in a funnel shape arranged horizontally. On both sides of the die sleeve 4 along the axis of the second cavity 7 and on the outer circumferential surface in direct contact with the inner wall of the first cavity 2, a plurality of first threaded holes 8 are opened, and the first threaded holes 8 are not communicated with the second cavity 7.

[0025] Specifically, the number of the first threaded holes 8 is not less than four, and a plurality of first threaded holes 8 are evenly distributed in a circle with the axis of the second cavity 7 as the center. The first threaded holes 8 and the limit grooves 5 are arranged in a staggered manner, and the first threaded holes 8 at both ends of the die sleeve 4 are arranged oppositely.

[0026] The die head 1 is provided with a second threaded hole 9 corresponding to the first threaded hole 8. The first threaded hole 8 is communicated with the second threaded hole 9 and has the same aperture. An adjusting bolt 10 is screwed in the second threaded hole 9. The threaded end of the adjusting bolt 10 penetrates through the second threaded hole 9 and is screwed with the first threaded hole 8. When the die sleeve 4 is connected to the die head 1, by simultaneously rotating and adjusting the adjusting bolts 10 connected to the first threaded holes 8 at both ends of the die sleeve 4, the concentricity of the cavity two 7 of the die sleeve 4 is adjusted as a whole.

[0027] A cavity three 11 is axially provided at the center of the die core 3. One end of the die core 3 inserted at the center of the cavity one 2 is sleeved in the cavity two 7. The cross-sectional shape of the part of the die core 3 sleeved in the die sleeve 4 along the axis of the cavity three 11 is a horizontally arranged funnel shape. The die sleeve 4 is matched with the die core 3, and an annular flow channel 12 is formed at the center of the cavity one 2. The cross-sectional shape of the annular flow channel 12 along the axis of the cavity one 2 is a horizontally arranged funnel shape. The die head 1 is provided with a feed port corresponding to the annular flow channel 12, and the feed port is communicated with the output end of the cable extruder. The cable extruder is an existing conventional technology.

[0028] The metal wire core of the cable passes through the cavity three 11 horizontally and then horizontally penetrates through the cavity two 7 again. At the same time, the cable extruder extrudes the molten cable material into the annular flow channel 12 through the feed port and enters the cavity two 7 to coat the metal wire core of the cable, thereby completing the forming extrusion work of the cable.

[0029] A plurality of threaded holes three 13 are provided on the outer circumferential surface of the two ends of the die core 3 along the axis of the cavity three 11 and in direct contact with the inner wall of the cavity one 2. The threaded holes three 13 are not communicated with the cavity three 11.

[0030] Specifically, the number of the threaded holes three 13 is not less than four. The plurality of threaded holes three 13 are evenly distributed in a circle with the axis of the cavity three 11 as the center. The threaded holes three 13 and the limiting grooves 5 are arranged in a staggered manner. The threaded holes three 13 at both ends of the die core 3 are arranged oppositely. The threaded holes one 8 and the threaded holes three 13 are arranged oppositely.

[0031] The die head 1 is provided with a fourth threaded hole 14 corresponding to the threaded hole three 13. The threaded hole three 13 is communicated with the fourth threaded hole 14 and has the same aperture. An adjusting bolt two 15 is screwed in the fourth threaded hole 14. The threaded end of the adjusting bolt two 15 penetrates through the fourth threaded hole 14 and is screwed with the threaded hole three 13. When the die core 3 is connected to the die head 1, by simultaneously rotating and adjusting the adjusting bolts two 15 connected to the threaded holes three 13 at both ends of the die core 3, the concentricity of the cavity three 11 of the die core 3 is adjusted as a whole.

[0032] On the outer circumferential surface of the die sleeve 4 and the side of the die core 3 close to the center of the cavity 1 and in direct contact with the inner wall of the cavity 1, an annular groove 16 for nesting a sealing ring is provided. Corresponding to the sealing ring, an annular groove 17 is provided on the inner wall of the cavity 1. The sealing ring is placed in the annular groove 16 and the annular groove 17. The sealing ring is made of a high-temperature heat-resistant material to seal the gap between the die sleeve 4 and the die core 3 and the inner wall of the cavity 1, preventing the cable material in the feed port from entering the connection gap between the die sleeve 4 and the die core 3 and the inner wall of the cavity 1.

[0033] In this embodiment, the die sleeve 4 and the die core 3 are respectively inserted into both ends of the cavity 1, and the limiting strip 6 and the limiting groove 5 are matched to insert the die sleeve 4 and the die core 3 into the cavity 1.

[0034] Through the cooperation of the limiting strip 6 and the limiting groove 5, the first threaded hole 8 of the die sleeve 4 is communicated with the second threaded hole 9 of the die head 1. At the same time, the third threaded hole 13 of the die core 3 is communicated with the fourth threaded hole 14 of the die head 1.

[0035] There will be a small gap between the die sleeve 4 and the die core 3 and the cavity 1, resulting in a small deviation in the concentricity of the die sleeve 4 and the die core 3. Tighten the first adjusting bolt 10 and the second adjusting bolt 15 simultaneously to connect the die sleeve 4 and the die core 3 to the die head 1, and respectively adjust the screwing depth of the first adjusting bolt 10 and the second adjusting bolt 15 to perform an overall eccentric adjustment on the die sleeve 4 and the die core 3 respectively, so as to finely adjust the concentricity of the die sleeve 4 and the die core 3, thereby improving the quality effect of the cable during the extrusion coating process.

[0036] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0037] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-temperature resistant cable extrusion die, comprising a die head (1), characterized in that: A cavity one (2) is formed in the die head (1). A die core (3) and a die sleeve (4) are respectively sleeved at two ends of the cavity one (2). A cavity two (7) is formed in the die sleeve (4). A plurality of first threaded holes (8) are formed in the outer circumferential surfaces on both sides of the die sleeve (4) along the axial direction of the cavity two (7). Second threaded holes (9) are formed in the die head (1) corresponding to the first threaded holes (8). An adjusting bolt one (10) is screwed in the second threaded holes (9). The threaded end of the adjusting bolt one (10) penetrates through the second threaded holes (9) and is screwed with the first threaded holes (8). A cavity three (11) is formed in the die core (3). A plurality of third threaded holes (13) are formed in the outer circumferential surfaces at two ends of the die core (3) along the axial direction of the cavity three (11). Fourth threaded holes (14) are formed in the die head (1) corresponding to the third threaded holes (13). An adjusting bolt two (15) is screwed in the fourth threaded holes (14). The threaded end of the adjusting bolt two (15) penetrates through the fourth threaded holes (14) and is screwed with the third threaded holes (13).

2. The high-temperature resistant cable extrusion die according to claim 1, wherein: A plurality of limiting grooves (5) are formed in both ends of the inner wall of the cavity one (2) along the axial direction. Limiting strips (6) are fixedly connected to the outer circumferential surfaces of the die core (3) and the die sleeve (4) corresponding to the limiting grooves (5).

3. A high-temperature resistant cable extrusion die according to claim 1, characterized in that: The number of the first threaded holes (8) and the third threaded holes (13) is not less than four. The plurality of first threaded holes (8) are evenly distributed in a circumferential manner with the axis of the cavity two (7) as the center. The plurality of third threaded holes (13) are evenly distributed in a circumferential manner with the axis of the cavity three (11) as the center.

4. A high-temperature resistant cable extrusion die according to claim 1, characterized in that: The first threaded holes (8) and the third threaded holes (13) are arranged in a staggered manner with the limiting grooves (5). The first threaded holes (8) at both ends of the die sleeve (4) are arranged oppositely. The third threaded holes (13) at both ends of the die core (3) are arranged oppositely. The first threaded holes (8) and the third threaded holes (13) are arranged oppositely.

5. The high-temperature resistant cable extrusion die according to claim 2, characterized in that: The number of the limiting grooves (5) formed in one end of the cavity one (2) along the axial direction is not less than three. The plurality of limiting grooves (5) are evenly distributed in a circumferential manner with the axis of the cavity one (2) as the center. The limiting grooves (5) at both ends of the cavity one (2) are symmetrically arranged with the center point of the cavity one (2) as the reference.

6. The high-temperature resistant cable extrusion die according to claim 1, characterized in that: The cross-section of the cavity two (7) along the axial direction and on the side close to the center of the cavity one (2) is in a horizontally arranged funnel shape. One end of the die core (3) inserted into the center of the cavity one (2) is sleeved in the cavity two (7). The cross-section shape of the part of the die core (3) sleeved in the die sleeve (4) along the axial direction of the cavity three (11) is in a horizontally arranged funnel shape. The die sleeve (4) and the die core (3) cooperate to form an annular flow channel (12) at the center in the cavity one (2).

7. The high-temperature resistant cable extrusion die according to claim 6, characterized in that: The die head (1) is provided with a feed port corresponding to the annular flow channel (12). The feed port is communicated with the output end of the cable extruder.

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