A cable jacket injection molding apparatus

Abstract

The utility model relates to cable manufacturing equipment technical field especially relates to a kind of cable sheath injection molding equipment, including rack, heating bucket is installed on the rack, extrusion pipe is connected in the bottom of the heating bucket, servo motor is installed on the rack top, the output shaft of the servo motor is connected with connecting rod by coupling, the bottom end of the connecting rod is connected with threaded conveying rod, and the threaded conveying rod is located inside the extrusion pipe. By setting threaded connection pipe with internal thread at the end of extrusion pipe, and adopting external thread cooperation to realize detachable connection with extrusion pipe, the extrusion die can be rotated threaded connection pipe without using special tools to realize quick installation and disassembly, complete die replacement, cleaning or repair operation, greatly shorten downtime, improve the flexible level and die-changing efficiency of production line.

Description

Technical Field

[0001] This utility model relates to the field of cable manufacturing equipment technology, and in particular to a cable sheath injection molding equipment. Background Technology

[0002] In the manufacturing process of wires and cables, the extrusion molding of the sheath layer is one of the key processes. The sheath is mainly used to protect the internal conductor and insulation layer of the cable, prevent mechanical damage, moisture intrusion, chemical corrosion, and provide electrical insulation or flame retardant properties. At present, the widely used sheath molding process is extrusion molding technology, and its core equipment is a plastic extruder. The thermoplastic polymer material is plasticized into a viscous melt through heating, shearing, compression and homogenization in a heated barrel. Then, it is pushed to the extrusion die by a screw under pressure. It is uniformly wrapped around the outer periphery of the synchronously moving cable core in the annular die. After subsequent cooling, shaping, traction and winding processes, a continuous, dense and uniform thickness sheath layer is formed.

[0003] Currently, although traditional plastic extruders have matured through long-term application, they still have several technical defects. The extrusion dies in traditional plastic extruders are mostly fastened to the extruder head outlet end by flanges and bolts. Installation and disassembly require the use of special tools such as wrenches, which makes the operation cumbersome and time-consuming. Especially when it is necessary to frequently change product specifications or clean up the accumulated material in the die, the downtime is extended, which seriously affects the flexibility of the production line and the efficiency of die changing.

[0004] Therefore, there is an urgent need to provide a cable sheath injection molding equipment that facilitates mold changing and disassembly, and improves maintainability. Utility Model Content

[0005] In order to overcome the shortcomings of traditional cable sheath extrusion equipment, such as inconvenient disassembly and assembly of extrusion molds, low mold changing efficiency, and complex maintenance operations, this utility model provides a cable sheath injection molding equipment that facilitates mold changing and disassembly, and improves maintainability.

[0006] To address the aforementioned issues, this utility model employs the following technical solution: a cable sheath injection molding equipment, comprising a frame, a heating tank mounted on the frame, an extrusion tube connected to the bottom of the heating tank, a servo motor mounted on the top of the frame, a connecting rod connected to the output shaft of the servo motor via a coupling, a threaded conveying rod connected to the bottom end of the connecting rod, the threaded conveying rod being located inside the extrusion tube, a stirring rod provided at the upper end of the connecting rod, an external thread provided on the outer wall of the lower end of the extrusion tube, and a threaded connecting tube with an internal thread fitted to its end, the threaded connecting tube being screwed onto the lower end of the extrusion tube via a threaded engagement to form a detachable mechanical connection, an extrusion die mounted at the bottom end of the extrusion tube, and an annular handle provided on the outer periphery of the threaded connecting tube.

[0007] Optionally, the stirring rod is shaped according to the contour of the inner wall of the heating tank.

[0008] Optionally, the annular grip is covered with a heat-resistant and non-slip sleeve.

[0009] Optionally, one end of the extrusion die is detachably provided with a guide frame. The guide frame is quickly assembled and disassembled with the extrusion die through a plug-in structure. Symmetrically distributed guide rods are fixedly connected to the guide frame. A moving block is slidably provided on the guide rod. A limit wheel is provided at the bottom of the moving block. A spring is sleeved on the guide rod. The two ends of the spring are fixedly connected to the moving block and the guide frame, respectively. A pull rod is fixedly connected to the guide frame.

[0010] Optionally, a rubber ring is fitted around the insertion end of the guide frame.

[0011] Optionally, a connecting plate is fixed to one side of the lower part of the frame, and a cooling fan is installed on the connecting plate. The air outlet of the cooling fan faces the heat outlet area of ​​the extrusion die, and a dustproof net is provided at the air inlet of the cooling fan.

[0012] Optionally, an observation plate is embedded in the outer periphery of the heating barrel.

[0013] Compared with the prior art, the present invention has the following technical effects: 1. By setting a threaded connecting pipe with internal threads at the end of the extrusion tube and using external thread to achieve a detachable connection with the extrusion tube, the extrusion die can be quickly installed and disassembled by rotating the threaded connecting pipe without the use of special tools, so as to complete the die replacement, cleaning or maintenance work, greatly shorten the downtime, and improve the flexibility of the production line and the die changing efficiency.

[0014] 2. By detachably configuring a guide frame at the inlet end of the extrusion die, and setting a sliding limit wheel structure with spring preload on the guide frame, the clamping distance can be automatically adjusted according to the cable core diameter, effectively suppressing the lateral sway and axial offset of the cable core during the conveying process, ensuring that the cable core is always in the center position of the die, and improving the product concentricity and appearance quality.

[0015] 3. By installing a connecting plate and a cooling fan at the bottom of the frame, with the air outlet facing the extrusion die outlet area, forced air cooling can be performed immediately after the sheath is extruded, accelerating the surface cooling and solidification, preventing the high-temperature sheath from deforming, sticking or collapsing under its own weight or during traction, and ensuring the stable operation of subsequent processes. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2This is a three-dimensional sectional view of the frame, heating tank, and stirring rod of this utility model.

[0018] Figure 3 This is a three-dimensional sectional view of the extrusion tube, threaded connection tube, and extrusion die components of this utility model.

[0019] Figure 4 This is a three-dimensional sectional view of the guide frame, limit wheel, and pull rod of this utility model.

[0020] Figure 5 This is a three-dimensional sectional view of the connecting plate, cooling fan, and dustproof net of this utility model.

[0021] The meanings of the labels in the attached diagram are as follows: 1: Frame, 2: Extrusion tube, 3: Heating tank, 4: Servo motor, 5: Connecting rod, 6: Threaded conveying rod, 7: Stirring rod, 8: Threaded connecting tube, 9: Extrusion die, 10: Ring handle, 11: Temperature-resistant anti-slip sleeve, 12: Guide frame, 13: Guide rod, 14: Moving block, 15: Limiting wheel, 16: Spring, 17: Pull rod, 18: Rubber ring, 19: Connecting plate, 20: Cooling fan, 21: Dustproof net, 22: Observation plate. Detailed Implementation

[0022] 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.

[0023] Example 1: Please refer to Figures 1-3A cable sheath injection molding machine includes a frame 1, on which a heating tank 3 is mounted for heating the input plastic granules to a molten state. An extrusion tube 2 is connected to the bottom of the heating tank 3. A servo motor 4 is mounted on the top of the frame 1. The output shaft of the servo motor 4 is connected to a connecting rod 5 via a coupling. A threaded conveying rod 6 is connected to the bottom of the connecting rod 5. The threaded conveying rod 6 is located inside the extrusion tube 2, enabling efficient conveying and extrusion of the plastic material. A stirring rod 7 is provided at the upper end of the connecting rod 5. The shape of the stirring rod 7 is designed according to the inner wall contour of the heating tank 3 to ensure that there is no dead corner accumulation of material during the stirring process, enhancing the preheating and mixing in the initial stage. To improve plasticization uniformity, the lower end of the extrusion tube 2 has an external thread on its outer wall, and its end is fitted with a threaded connecting tube 8 with an internal thread. The threaded connecting tube 8 is screwed onto the lower end of the extrusion tube 2 through threaded engagement, forming a detachable mechanical connection. An extrusion die 9 is installed at the bottom end of the extrusion tube 2. The extrusion die 9 adopts a die core and die sleeve combination structure, forming an annular cross-section flow channel around the cable core to be coated, so that the molten plastic is uniformly coated on the surface of the moving cable core. After cooling and shaping, a dense and continuous sheath layer is formed. An annular handle 10 is provided on the outer periphery of the threaded connecting tube 8. A heat-resistant and anti-slip sleeve 11 is fitted on the outside of the annular handle 10 to improve the safety and convenience of operation.

[0024] In operation, the cable core to be coated is first introduced from below the equipment, passing through the central channel of the extrusion die 9, and driven forward at a constant speed by the traction device. Simultaneously, granular or powdered plastic raw materials are added to the heating tank 3. After starting the servo motor 4, the power is transmitted to the connecting rod 5 via the coupling, driving the threaded conveying rod 6 to rotate inside the extrusion tube 2. The material is propelled forward under the conveying action of the screw, undergoing four stages: solid conveying, compression melting, shearing plasticization, and homogenization. Under the combined action of external heating in the heating tank 3 and the shearing heat of the screw, it gradually transforms into a viscous melt. The stirring rod 7 rotates synchronously with the main shaft, disturbing and premixing the unmelted material in the upper part of the heating tank 3 to prevent local overheating and promote heat transfer. The molten plastic is pushed to the lower end of the extrusion tube 2 by the threaded conveyor rod 6. Under continuous pressure, it enters the extrusion die 9 through the threaded connecting tube 8. The flow channel design inside the die ensures uniform melt distribution and extrusion from the die annular gap at a constant speed, covering the outer periphery of the synchronously advancing cable core to form a sheath layer with consistent thickness and dense structure. When it is necessary to change product specifications, clean accumulated material, or maintain the die, the device can be stopped. Then, hold the ring handle 10 and rotate the threaded connecting tube 8 counterclockwise to remove it from the extrusion tube 2. Then, remove the extrusion die 9 as a whole for cleaning or replacement. After maintenance, reinstall the die assembly and tighten the threaded connecting tube 8 clockwise to achieve quick positioning and reliable sealing.

[0025] Example 2: Based on Example 1, please refer to... Figure 4The right end of the extrusion die 9 is detachably equipped with a guide frame 12. The guide frame 12 is quickly assembled and disassembled with the extrusion die 9 via a plug-in structure. Specifically, the plug-in structure has a plug block on the left side of the guide frame 12, and the end of the extrusion die 9 has a matching plug hole. After the plug block is inserted into the plug hole, axial positioning and radial alignment are achieved without bolt fastening, facilitating the disassembly of the guide frame 12. The guide frame 12 is fixedly connected with guide rods 13 symmetrically distributed front and rear. A sliding block 14 is slidably mounted on the guide rod 13. A limit wheel 15 is provided at the bottom of block 14 to clamp and guide the cable core through the center of the mold. A spring 16 is sleeved on the guide rod 13. The front and rear ends of the spring 16 are fixedly connected to the moving block 14 and the guide frame 12, respectively, to provide continuous pre-tightening restoring force for the moving block 14. A pull rod 17 is fixedly connected to the guide frame 12. A rubber ring 18 is sleeved on the outside of the insertion end of the guide frame 12 to enhance the friction and connection stability between the insertion block and the insertion hole, and to prevent the guide frame 12 from loosening or falling off due to vibration during equipment operation.

[0026] Please see Figure 5 A connecting plate 19 is fixedly connected to the lower left side of the frame 1. A cooling fan 20 is installed on the connecting plate 19. The air outlet of the cooling fan 20 faces the heating outlet area of ​​the extrusion die 9 and is used to perform preliminary forced cooling and shaping of the high-temperature melt. The air inlet of the cooling fan 20 is equipped with a dustproof net 21, which can effectively block dust, debris and other pollutants in the workshop environment from entering the air duct, prevent the fan from malfunctioning or blowing out dirty air to contaminate the product surface, and ensure the cleanliness and reliability of the cooling process.

[0027] During operation, when the cable core is introduced into the equipment by the traction device, it first passes through the gap between the two limiting wheels 15. Under the pre-tightening force of the spring 16, the limiting wheels 15 automatically attach and clamp the cable core, realizing dynamic adaptive guidance and suppressing vibration and deviation during operation. Subsequently, the molten plastic is pushed by the screw pressure and evenly covers the outer periphery of the cable core through the extrusion die 9. The high-temperature sheath and cable core after extrusion immediately enter the working area of ​​the cooling fan 20. The cold air accelerates the cooling and solidification of its surface layer, preventing the sheath from deforming or sticking under its own weight, and ensuring the stability of subsequent traction and take-up processes.

[0028] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A cable sheath injection molding equipment, comprising a frame (1), a heating tank (3) mounted on the frame (1), an extrusion tube (2) connected to the bottom of the heating tank (3), a servo motor (4) mounted on the top of the frame (1), the output shaft of the servo motor (4) being connected to a connecting rod (5) via a coupling, a threaded conveying rod (6) connected to the bottom end of the connecting rod (5), the threaded conveying rod (6) being located inside the extrusion tube (2), and a stirring rod (7) provided at the upper end of the connecting rod (5), characterized in that: The lower end of the extrusion tube (2) is provided with an external thread, and its end is equipped with a threaded connecting tube (8) with an internal thread. The threaded connecting tube (8) is screwed to the lower end of the extrusion tube (2) through threaded engagement to form a detachable mechanical connection. The bottom end of the extrusion tube (2) is equipped with an extrusion mold (9), and the outer periphery of the threaded connecting tube (8) is provided with an annular handle (10).

2. The cable sheath injection molding equipment according to claim 1, characterized in that: The shape of the stirring rod (7) is designed according to the inner wall contour of the heating barrel (3).

3. A cable sheath injection molding equipment according to claim 2, characterized in that: The ring grip (10) is covered with a heat-resistant and anti-slip sleeve (11).

4. A cable sheath injection molding equipment according to claim 3, characterized in that: One end of the extrusion mold (9) is detachably provided with a guide frame (12). The guide frame (12) is quickly assembled and disassembled with the extrusion mold (9) through a plug-in structure. Symmetrically distributed guide rods (13) are fixedly connected to the guide frame (12). A moving block (14) is slidably provided on the guide rod (13). A limit wheel (15) is provided at the bottom of the moving block (14). A spring (16) is sleeved on the guide rod (13). The two ends of the spring (16) are fixedly connected to the moving block (14) and the guide frame (12) respectively. A pull rod (17) is fixedly connected to the guide frame (12).

5. A cable sheath injection molding equipment according to claim 4, characterized in that: A rubber ring (18) is fitted around the insertion end of the guide frame (12).

6. A cable sheath injection molding equipment according to claim 5, characterized in that: A connecting plate (19) is fixed to one side of the lower part of the frame (1). A cooling fan (20) is installed on the connecting plate (19). The air outlet of the cooling fan (20) faces the heat outlet area of ​​the extrusion mold (9). A dustproof net (21) is provided at the air inlet of the cooling fan (20).

7. A cable sheath injection molding equipment according to claim 6, characterized in that: An observation plate (22) is embedded in the outer periphery of the heating barrel (3).

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