Adjustable extrusion die for cable production

Abstract

The utility model relates to extrusion mould technical field discloses adjustable extrusion mould for cable production, including die bush and mould core, the inside left end of die bush is provided with first taper slot, the inside right end of die bush is provided with the round groove of intercommunication first taper slot, and the inside right end of core cylinder is provided with second taper slot, and the mould core is inserted and is installed in second taper slot, and the mould core is sleeved with adjusting ring, and the circumference outside of die bush is fixed with the sheath, and the right end of sheath, die bush is installed with the end cap for resisting the adjusting ring, and the circumference side of die bush evenly is provided with the screw hole, and the screw hole is screwed and is installed with the screw rod for resisting the adjusting ring, and the sheath is installed with the adjusting assembly for driving screw rod and the measuring assembly for monitoring screw rod. The utility model discloses through the cooperation of adjusting assembly, measuring assembly, can drive screw rod and realize automatic regulation, and the offset correction efficiency is improved, and the core cylinder adopts multistage even distribution runner design, and the circumferential even distribution of molten material is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of extrusion die technology, specifically to an adjustable cable production extrusion die. Background Technology

[0002] The production process of cable insulation mainly uses an extruder and an extrusion die to melt and plasticize the plastic and circumferentially extrude it, continuously wrapping the insulation layer onto the wire core. The wrapping operation is completed with subsequent cooling treatment.

[0003] The extrusion die mainly consists of a die sleeve, a die core, and an adjusting die. A uniform flow channel is formed between the die sleeve and the die core, and an extrusion flow channel is formed between the die core and the adjusting die. Pressure is used to force the molten plastic into the uniform flow channel and the extrusion flow channel, and finally wrap it around the core.

[0004] Due to issues such as cable misalignment and assembly misalignment, the insulation layer output from the extrusion channel may exhibit uneven wall thickness. Currently, the adjustment die requires fine-tuning via four screws, with each screw corresponding to displacement control in one direction. During adjustment, a closed-loop operation of "fine-tuning-measurement-re-adjustment" is performed based on the cable cross-section test results to gradually correct the channel gap deviation, ultimately controlling the wall thickness deviation within ±0.02mm to ensure the wall thickness of the cable insulation layer.

[0005] This manual, repeated adjustment method is inefficient and requires staff to have certain work experience to make quick adjustments, making it quite difficult to operate.

[0006] Therefore, in order to solve the above problems, an adjustable cable production extrusion die is proposed. Utility Model Content

[0007] The purpose of this invention is to provide an adjustable extrusion die for cable production, which can improve the efficiency of offset correction, thereby solving the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: An adjustable cable production extrusion die includes a die sleeve and a die core. The die sleeve has a first conical groove at its left inner end and a circular groove at its right inner end connecting to the first conical groove. A core cylinder is inserted into the first conical groove, and a locking nut for securing the die sleeve is screwed to the left end of the core cylinder. The core cylinder has a second conical groove at its right inner end, and a die core is inserted into the second conical groove. An adjusting ring is fitted onto the die core, located within the circular groove. A uniform flow channel is formed between the first conical groove and the core cylinder, and an extrusion flow channel is formed between the adjusting ring and the die core. An input channel connecting to the uniform flow channel is provided at the top of the die sleeve. A protective sleeve is fixedly installed on the outer circumference of the die sleeve. An end cap for securing the adjusting ring is installed on the right end of the protective sleeve and the die sleeve. Screw holes are evenly distributed on the circumference of the die sleeve, and screws for securing the adjusting ring are screwed into these screw holes. An adjusting component for driving the screw and a measuring component for monitoring the screw are installed inside the protective sleeve.

[0009] Specifically, there are 3 to 5 screws evenly distributed around the circumference.

[0010] Specifically, the adjustment assembly includes a servo motor, a drive gear, and a driven gear. The servo motor is fixedly assembled with the sheath, and the drive gear is fixedly installed at the output end of the servo motor. The driven gear is fixedly installed at the end of the screw away from the adjustment ring, and the driven gear meshes with the drive gear.

[0011] Specifically, the measuring component includes a tension / compression sensor and a rotating base. The rotating base is fixedly installed at the end of the driven gear away from the screw, and the tension / compression sensor is fixedly installed between the lifting ring and the protective sleeve of the rotating base.

[0012] Specifically, the core tube includes an integrally formed external thread section, a tapered enlargement section, and a tapered reduction section from left to right. The external thread section extends out of the left end of the mold sleeve and is screwed and assembled with a locking nut. The tapered enlargement section has three annular grooves evenly distributed along the axial direction on its circumferential side. A rectangular groove is formed between the left annular groove and the middle annular groove. An arc groove is formed between the middle annular groove and the right annular groove. The rectangular groove and the arc groove are both evenly distributed in circumference, with 10 to 15 of them.

[0013] Furthermore, the rectangular groove and the arc-shaped groove are circumferentially misaligned.

[0014] Furthermore, a positioning groove is provided at the bottom of the tapered enlarged section, and a positioning hole for aligning the positioning groove is provided at the bottom of the mold sleeve.

[0015] Compared with the prior art, the beneficial effects of this utility model are: By coordinating the adjustment and measurement components, the screw can be driven to achieve automatic adjustment, replacing traditional manual operation, greatly improving the efficiency of offset correction, and reducing the dependence on operating experience. The core tube adopts a multi-stage uniformly distributed flow channel design, with annular grooves, rectangular grooves, and arc grooves staggered to enhance the circumferential uniformity of the molten material, reduce local flow velocity differences, and improve the molding quality of the insulation layer. Attached Figure Description

[0016] Figure 1 This is a schematic cross-sectional view of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of the adjustment component and the measuring component of this utility model; Figure 3 This is a three-dimensional schematic diagram of the core tube structure of this utility model.

[0017] In the diagram: 1. Mold sleeve, 2. Input channel, 3. Adjustment component, 31. Servo motor, 32. Drive gear, 33. Driven gear, 4. Measurement component, 41. Tension / compression sensor, 42. Rotary seat, 5. Screw, 6. Adjustment ring, 7. Mold core, 8. Core cylinder, 81. External thread section, 82. Conical enlargement section, 83. Annular groove, 84. Conical reduction section, 85. Rectangular groove, 86. Arc groove, 9. End cap, 10. Protective sleeve, 11. Positioning hole, 12. Locking nut. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example content: Please see Figure 1 An adjustable extrusion die for cable production is provided, including a die sleeve 1 and a die core 7. The left end of the die sleeve 1 has a first conical groove with a smaller left end and a larger right end. The right end of the die sleeve 1 has a circular groove that connects to the first conical groove. A core cylinder 8 is inserted and installed in the first conical groove. A locking nut 12 for pressing against the die sleeve 1 is screwed to the left end of the core cylinder 8. The conical groove design of the die sleeve 1 utilizes the principle of taper self-locking to ensure that the core cylinder 8 is installed firmly. The locking nut 12 is used to securely install the core cylinder 8 in the first conical groove and facilitates disassembly and maintenance.

[0020] The inner right end of the core cylinder 8 is provided with a second conical groove. The left end of the second conical groove is smaller and the right end is larger. The mold core 7 is inserted and installed in the second conical groove. The mold core 7 is a truncated cone with two large ends connected together and is integrally machined with the cylinder at the right end. A through groove for the wire core to pass through is provided along the axial direction at the center.

[0021] The die core 7 is fitted with an adjusting ring 6, which is located in a circular groove. A uniform flow channel is formed between the first conical groove and the core cylinder 8. An extrusion flow channel is formed between the adjusting ring 6 and the die core 7. The extrusion flow channel is shaped like a trumpet with a larger left end and a smaller right end. The top of the die sleeve 1 is provided with an input channel 2 that connects to the uniform flow channel. When in use, the input channel 2 is connected to the extruder. The extruded molten material enters the uniform flow channel through the input channel 2 and is finally output from the extrusion flow channel and covers the wire core passing through the center, thus realizing the coating operation of a continuous insulation layer.

[0022] A protective sleeve 10 is fixedly installed on the outer circumference of the die sleeve 1. The right end of the protective sleeve 10 and the die sleeve 1 is connected by screws to install an end cap 9 for pressing the adjusting ring 6. Screw holes are evenly opened on the circumference of the die sleeve 1. A screw 5 for pressing the adjusting ring 6 is screwed into the screw holes. An adjustment component 3 for driving the screw 5 and a measuring component 4 for monitoring the screw 5 are installed inside the protective sleeve 10. The adjustment component 3 can rotate the screw 5 under control. The rotation of the screw 5 in the screw hole can be converted into linear movement, thereby enabling fine adjustment of the force pressing the adjusting ring 6 from multiple directions to complete the correction work and ensure that the insulation layer wall thickness output from the extrusion channel is uniform. At the same time, the measuring component 4 can accurately monitor the tension and pressure on the screw 5, providing a data basis for the offset analysis of the industrial control computer.

[0023] There are 3 to 5 screws evenly distributed around the circumference to ensure that the direction of the clamping of the adjusting ring 6 is sufficient to meet the needs of eccentric adjustment, so that the adjusting ring 6 can be flexibly adjusted and positioned along the radial direction.

[0024] Please see Figure 2 Adjust the structure of component 3: The adjustment assembly 3 includes a servo motor 31, a drive gear 32, and a driven gear 33. The servo motor 31 is fixedly assembled with the sheath 10. The servo motor 31 is also circumferentially distributed and corresponds to the number and position of the screws 5. The output end of the servo motor 31 is fixedly mounted with the drive gear 32. The end of the screw 5 away from the adjustment ring 6 is fixedly mounted with the driven gear 33. The driven gear 33 meshes with the drive gear 32.

[0025] When the servo motor 31 is working, it can rotate the drive gear 32, and through the meshing relationship, rotate the driven gear 33 in the forward and reverse directions to complete the rotation drive of the screw 5. In order to ensure the range of displacement of the screw 5, the thickness of the driven gear 33 is at least twice that of the drive gear 32 to avoid gear disengagement.

[0026] Structure of measuring component 4: The measuring component 4 includes a tension / compression sensor 41 and a rotating base 42. The rotating base 42 is fixedly installed at the end of the driven gear 33 away from the screw 5. The tension / compression sensor 41 is fixedly installed between the lifting ring and the protective sleeve 10 of the rotating base 42.

[0027] The rotating seat 42 is an existing component consisting of a seat body and a lifting ring rotatably mounted on the seat body. It can withstand tension and pressure while the seat body rotates with the screw 5, and the lifting ring connected to the tension and pressure sensor 41 can remain stationary. When the screw 5 is displaced, the tension and pressure sensor 41 can monitor the tension and pressure applied by the screw 5 to the tension and pressure sensor 41 in real time, so as to avoid the screw 5 from being too tight or too loose during use.

[0028] Please see Figure 3 The structure of core tube 8: The core tube 8 includes an integrally formed external thread section 81, a tapered enlarged section 82, and a tapered reduced section 84 from left to right. The outer circumference of the tapered enlarged section 82 is smaller at the left end and larger at the right end, while the outer circumference of the tapered reduced section 84 is larger at the left end and smaller at the right end. The center of the external thread section 81, the tapered enlarged section 82, and the tapered reduced section 84 is also provided with a guide groove for the wire core to pass through. The guide groove and the through groove together form the passage for the wire core.

[0029] The external thread section 81 extends out of the left end of the mold sleeve 1 and is screwed and assembled with the locking nut 12. The circumferential side of the tapered enlarged section 82 is evenly provided with three annular grooves 83 along the axial direction. A rectangular groove 85 is provided between the left annular groove 83 and the middle annular groove 83. An arc groove 86 is provided between the middle annular groove 83 and the right annular groove 83. The rectangular groove 85 and the arc groove 86 are both evenly distributed in circumference, with 10 to 15 of them.

[0030] The molten material first enters the left annular groove 83 through the input channel 2, then is evenly distributed through the rectangular grooves 85 before entering the middle annular groove 83. After being bent and guided again by the evenly distributed arc grooves 86, it enters the right annular groove 83, which is a uniform flow channel. This can improve the uniformity of the molten material distribution in the circumference, and ensure that the molten material entering the extrusion channel is subjected to uniform force and has better molding quality.

[0031] In addition, the rectangular groove 85 and the arc-shaped groove 86 are staggered in the circumferential direction to increase the randomness of material flow and avoid local flow velocity differences, so as to further improve the effect of circumferential uniform distribution of molten material.

[0032] To ensure the positional accuracy of core cylinder 8 during installation: The bottom of the tapered enlarged section 82 is provided with a positioning groove, and the bottom of the mold sleeve 1 is provided with a positioning hole 11 for aligning the positioning groove. When the core cylinder 8 is installed in the first tapered groove, the positioning pin is inserted into the positioning groove through the positioning hole 11 to ensure the consistency of the circumferential installation of the core cylinder 8, and also to assist in the axial positioning of the core cylinder 8, which is conducive to the installation of the locking nut 12.

[0033] The adjusting ring 6, mold core 7, and core cylinder 8 are made of alloy steel and are nitrided to improve wear resistance. They can be easily replaced individually after long-term use.

[0034] The working principle of this embodiment: During operation, the molten material enters the uniform distribution channel through the input channel 2, and after being uniformly distributed through multiple stages of annular groove 83, rectangular groove 85 and arc groove 86, it enters the extrusion channel, covering the wire core passing through the center to form an insulating layer. Based on the cross-sectional image of the cable inspection, the industrial control computer can drive the adjustment component 3 and the measurement component 4 to rotate multiple screws 5 in coordination to adjust the eccentric position of the adjustment ring 6, thereby realizing the periodic correction of the extrusion channel and ensuring the uniform wall thickness of the insulation layer.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An adjustable extrusion die for cable production, comprising a die jacket (1) and a die core (7), characterized in that: The mold sleeve (1) has a first conical groove on the left side inside and a circular groove that connects to the first conical groove on the right side inside. A core cylinder (8) is inserted into the first conical groove and a locking nut (12) for pressing against the mold sleeve (1) is screwed onto the left side of the core cylinder (8). The inner right end of the core cylinder (8) is provided with a second conical groove, and a mold core (7) is inserted and installed in the second conical groove. The mold core (7) is fitted with an adjusting ring (6), and the adjusting ring (6) is located in the circular groove. A uniform flow channel is formed between the first conical groove and the core cylinder (8), and an extrusion flow channel is formed between the adjusting ring (6) and the mold core (7). The top of the mold sleeve (1) is provided with an input channel (2) that connects to the uniform flow channel. A protective sleeve (10) is fixedly installed on the outer circumference of the mold sleeve (1). An end cap (9) for pressing against the adjusting ring (6) is installed on the right end of the protective sleeve (10) and the mold sleeve (1). Screw holes are evenly opened on the circumference of the mold sleeve (1). A screw rod (5) for pressing against the adjusting ring (6) is screwed into the screw holes. An adjustment component (3) for driving the screw rod (5) and a measuring component (4) for monitoring the screw rod (5) are installed inside the protective sleeve (10).

2. The adjustable cable production extrusion die according to claim 1, characterized in that: The screws (5) are 3 to 5 in number, evenly distributed around the circumference.

3. The adjustable cable production extrusion die according to claim 1, characterized in that: The adjustment assembly (3) includes a servo motor (31), a drive gear (32) and a driven gear (33). The servo motor (31) is fixedly assembled with the sheath (10). The output end of the servo motor (31) is fixedly mounted with the drive gear (32). The end of the screw (5) away from the adjustment ring (6) is fixedly mounted with the driven gear (33). The driven gear (33) meshes with the drive gear (32).

4. The adjustable cable production extrusion die according to claim 3, characterized in that: The measuring component (4) includes a tension / compression sensor (41) and a rotating seat (42). The rotating seat (42) is fixedly installed at the end of the driven gear (33) away from the screw (5). The tension / compression sensor (41) is fixedly installed between the lifting ring and the sleeve (10) of the rotating seat (42).

5. The adjustable cable production extrusion die according to claim 1, characterized in that: The core tube (8) includes an integrally formed external thread section (81), a tapered enlarged section (82), and a tapered reduced section (84) from left to right. The external thread section (81) extends out of the left end of the mold sleeve (1) and is screwed into the locking nut (12). The tapered enlarged section (82) has three annular grooves (83) evenly distributed along the axial direction on its circumferential side. A rectangular groove (85) is opened between the annular groove (83) on the left and the annular groove (83) in the middle. An arc groove (86) is opened between the annular groove (83) in the middle and the annular groove (83) on the right. The rectangular groove (85) and the arc groove (86) are both 10 to 15 evenly distributed around the circumference.

6. The adjustable cable production extrusion die according to claim 5, characterized in that: The rectangular groove (85) and the arc groove (86) are arranged in a circumferentially offset manner.

7. The adjustable cable production extrusion die according to claim 5, characterized in that: The bottom of the tapered enlarged section (82) is provided with a positioning groove, and the bottom of the mold sleeve (1) is provided with a positioning hole (11) for aligning with the positioning groove.

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