Extruder head capable of preventing adhesion of epitaxy objects

Abstract

The utility model belongs to the technical field of plastic machinery, and particularly relates to an extrusion machine head capable of preventing adhesion of an epitaxial object. The utility model provides an extrusion machine head for preventing the adhesion of extensions, which comprises a shell, a die arranged in the shell and an air pipe unit arranged at the die orifice of the die, the air pipe unit comprises an air blowing structure which is arranged on the shell and blows air towards a cable, and an air draft structure which is arranged below the cable and is used for recovering the extensions at the die orifice of the die, according to the utility model, on the basis of reducing the probability of generating the epitaxy, an air pipe structure which is cooperated to complete air supply and air draft circulation is arranged to remove the epitaxy generated on the surface of the cable, and a bristle structure which assists the air pipe structure to act is further arranged.

Description

Technical Field

[0001] The utility model belongs to the technical field of plastic machinery, in particular to an extruder head capable of preventing extension objects from sticking. Background Art

[0002] The primary function of a cable sheathing extruder is to evenly coat the outer layer of a cable core with plastic or rubber material, forming a protective coating. This process not only enhances the insulation properties of the wire but also provides the necessary protection, ensuring the safety and stability of the cable in various environments. However, the extruder's die often contains extraneous matter, also known as precipitates or hard residue, which can reduce the quality of the produced cable sheathing.

[0003] The Chinese utility model patent with patent announcement number CN220482519U and announcement date of February 13, 2024, discloses a bell-mouth extrusion mold for cables, including a mold sleeve and a mold core, the interior of the mold sleeve is a central cavity, and the interior of the mold core is a wire outlet hole; the mold core is embedded in the central cavity of the mold sleeve, and the two are not in contact; a conical rubber flow channel is formed between the central cavity and the cone on the outer surface of the mold core; the end of the straight tubular wire-receiving area of ​​the wire outlet is a bell-mouth pipe mouth, and the angle formed by the bell-mouth pipe mouth and the central axis of the mold core is 20°, forming a bell-mouth wire-receiving area; a Teflon bushing is provided between the outer side of the bell-mouth wire-receiving area and the inner side of the mold sleeve, and the Teflon bushing is connected to the conical rubber flow channel.

[0004] The bell-mouth extrusion die for cables in this Chinese utility model patent has the following general usage and advantages: Since the sheath of the low-smoke halogen-free flame-retardant cable adopts an extrusion tube coating process, the core wire outlet hole of the extrusion die must have a tubular wire-receiving area, and the end is designed as a bell-mouth pipe mouth, and the angle formed by the bell-mouth pipe mouth and the central axis of the core 2 is 20°, forming a bell-mouth wire-receiving area. When the molten rubber is extruded through the flow channel to the glue outlet hole of the mold, the flow direction of the rubber is changed from a straight direction to an outward bell-mouth 20° diffusion direction, thereby effectively releasing the extrusion melt pressure of the low-smoke halogen-free flame-retardant polyolefin cable material, improving the melt fluidity, eliminating the extrusion annular corrugation and unstable glue discharge. The Teflon bushing reduces the friction resistance of the molten rubber when it flows through and will not stick to the die mouth, which will not cause the sheath extrusion stripes to be rough, eliminating the phenomenon of the sheath extrusion stripes being rough caused by the rubber sticking to the die mouth, and greatly improving the extrusion appearance of the cable sheath.

[0005] However, in actual use, the bell-mouth extrusion die for cables still has at least the following shortcomings, in other words, these are the technical problems to be solved by the present invention: although the structure of the die can effectively reduce the situation where the extensions adhere to the surface of the cable sheath, it cannot solve the impact of the extensions that have already been produced, and still needs to rely on manpower to manually remove them, which has great production limitations.

[0006] Therefore, in summary, there is an urgent need for an extruder structure capable of removing the produced epitaxial materials to solve the problem of this type of problem. Utility Model Content

[0007] The utility model provides an extruder head for preventing adhesion of extensions, comprising a shell, a mold arranged in the shell, and an air duct unit arranged at the die opening of the mold. The air duct unit comprises a blowing structure arranged on the shell for blowing air toward the cable, and an exhaust structure arranged below the cable for recovering extensions at the die opening of the mold, so that: on the basis of reducing the probability of generating extensions, the utility model sets an air duct structure that cooperates to complete the air supply and exhaust cycle to remove extensions that have been generated on the cable surface, and further sets a brush structure etc. that assists the air duct structure in its function.

[0008] The technical solution adopted by the present invention to solve the above-mentioned problem is: an extruder head for preventing adhesion of extensions, comprising a shell, a mold arranged inside the shell for producing cables, and an air duct unit arranged at the die opening of the mold; the air duct unit includes a blowing structure arranged on the shell and blowing air toward the cable, and an exhaust structure arranged below the cable and used to recover the extensions at the die opening of the mold.

[0009] A further preferred technical solution is that the blowing structure includes a first fan, a blowing pipe arranged on the shell and located outside the cable, an air nozzle arranged on the blowing pipe and facing the cable, and an air supply pipe connecting the first fan and the blowing pipe.

[0010] A further preferred technical solution is that: the blowing pipe is a ring pipe, and a plurality of the air nozzles are provided and distributed in a ring shape on the outer periphery of the cable.

[0011] A further preferred technical solution is that the blowing structure further includes a pressure valve arranged on the air supply pipe.

[0012] A further preferred technical solution is that the blowing structure further includes a temperature sensor arranged in the blowing pipe and a heating element arranged on the air supply pipe.

[0013] A further preferred technical solution is that the exhaust structure includes a second fan, a recovery hopper arranged at the lower end of the mold die, and an exhaust pipe for connecting the second fan and the recovery hopper.

[0014] A further preferred technical solution is that it further includes a brush unit arranged on the shell and located on the outer peripheral side of the cable.

[0015] A further preferred technical solution is that the bristle unit includes a plurality of mounting posts arranged on the periphery of the mold orifice and distributed in a ring shape, and bristles are mounted on the mounting posts.

[0016] A further preferred technical solution is that the bristle unit further comprises a rotating sleeve rotatably arranged on the mounting post for mounting the bristles, and a resistance ring arranged on the mounting post away from the end of the mold.

[0017] A further preferred technical solution is that a smooth layer is provided on the inner surface of the rotating sleeve and the outer surface of the mounting post. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front view of the first embodiment of the present utility model;

[0019] Figure 2 This is a front view of the second embodiment of the present utility model;

[0020] Figure 3 This is a side view of the second embodiment of the present utility model;

[0021] Figure 4 This is a partial front view of the third embodiment of the present utility model;

[0022] Figure 5 It is a partial side view of the third embodiment of the present invention.

[0023] In the figures, the meanings of the reference numerals are as follows:

[0024] Cable a;

[0025] Shell 1, mold 2, air duct unit 3, brush unit 4;

[0026] Blowing structure 31, exhaust structure 32, mounting column 41, bristles 42, rotating sleeve 43, blocking ring 44;

[0027] The first fan 311 , the blowing pipe 312 , the air nozzle 313 , the air supply pipe 314 , the pressure valve 315 , the temperature sensor 316 , the heating element 317 , the second fan 321 , the recovery hopper 322 , and the exhaust pipe 323 . DETAILED DESCRIPTION

[0028] The following describes the embodiments of the present invention in detail with reference to the accompanying drawings. The following descriptions are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention.

[0029] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. The words "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively. They are relative concepts and may therefore change accordingly according to their different positions and different usage states. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0030] Example 1

[0031] As attached Figures 1-3 As shown, an extruder head for preventing adhesion of extensions includes a shell 1, a mold 2 arranged in the shell 1 for producing a cable a, and an air duct unit 3 arranged at the die mouth of the mold 2; the air duct unit 3 includes a blowing structure 31 arranged on the shell 1 and blowing air toward the cable a, and an exhaust structure 32 arranged below the cable a and for recovering the extensions at the die mouth of the mold 2.

[0032] In this embodiment, the extruder head for preventing adhesion of the extension material is generally used as follows:

[0033] After the preparation of the cable and the sheath is completed in the mold 2, the coated cable is extruded from the die opening of the mold 2 and enters the subsequent cooling stage (not shown in the figure). At this time, the air duct unit 3 provides wind to the cable a to blow off the extensions retained on the surface of the cable a to avoid causing quality problems with the sheath; the air duct unit 3 includes a blowing structure 31 and an exhaust structure 32. The blowing structure 31 is used to supply air to the surface of the cable a, and the exhaust structure 32 is arranged under the cable a to receive the fallen extensions and continuously exhaust air so that the air flow passes through the outlet of the blowing structure 31 and carries the extensions to the cable a. The extension material enters the air inlet of the exhaust structure 32, forming a relatively stable motion trajectory to ensure the effective removal of the extension material adhering to the surface of the cable a; the mold 2 includes a mold sleeve, a mold core, a wire outlet cavity, etc., and the end of the wire outlet cavity is provided with an outward-octagonal wire outlet. The special angle design helps to complete the break between the extension material and the sheath, and also avoids the accumulation of material and reduces the generation of extension material. Furthermore, the surfaces of the mold runner, the wire outlet cavity and the wire outlet are all provided with a polytetrafluoroethylene coating to reduce the resistance during the flow process, avoid the formation of stagnant areas and thus the formation of extension material.

[0034] As a preferred embodiment of this embodiment, the blowing structure 31 includes a first fan 311, a blowing pipe 312 arranged on the shell 1 and located outside the cable a, a wind nozzle 313 arranged on the blowing pipe 312 and facing the cable a, and an air supply pipe 314 connecting the first fan 311 and the blowing pipe 312; the exhaust structure 32 includes a second fan 321, a recovery hopper 322 arranged at the lower end of the mold mouth of the mold 2, and an exhaust pipe 323 for connecting the second fan 321 and the recovery hopper 322.

[0035] In this embodiment, the first fan 311 is used to draw external air to form gas and send it to the air supply pipe 314 in parallel. The air supply pipe 314 further transports gas to the blowing pipe 312. The blowing pipe 312 can be set as a linear pipe, or it can be set to various forms according to actual conditions. The front end of the blowing pipe 312 is provided with a nozzle 313, and the nozzle 313 is preferably set to a narrow mouth shape, which helps to concentrate the air and improve the blowing efficiency; the second fan 321 is used to draw the air and debris near the recovery bucket 322 into the bucket through the exhaust pipe 323. The exhaust pipe 323 is preferably provided with a storage cavity for storing extensions to avoid the impact of extensions on the environment.

[0036] As a preference of this embodiment, the blowing structure 31 further includes a pressure valve 315 provided on the air supply pipe 314 .

[0037] In this embodiment, the pressure valve 315 indirectly affects the wind force by controlling the pressure of the airflow. The operator can change the valve opening by rotating or adjusting a handle, knob, or bolt on the valve, thereby controlling the fluid pressure. This simple and direct adjustment method allows for frequent adjustments of the airflow volume as needed. This is a well-known prior art technique for those skilled in the art and will not be further described in this embodiment.

[0038] As a preference of this embodiment, the blowing structure 31 further includes a temperature sensor 316 arranged in the blowing pipe 312 and a heating element 317 arranged on the air supply pipe 314 .

[0039] In this embodiment, the temperature sensor 316 is used to detect the temperature of the air within the blowing pipe 312. The heating element 317 is preferably a heating wire, such as an iron-chromium-aluminum alloy or a nickel-chromium alloy. When current passes through the heating wire, the electrical energy is converted into heat energy due to the effect of resistance, causing the heating wire temperature to rise. The high-temperature heating wire transfers heat to the surrounding air through convection and radiation, generating hot air that increases the temperature of the outgoing air. Because the temperature near the die opening is relatively high, reaching 170°C, to prevent the temperature from affecting the sheath and cable, it is preferred to provide hot air with a temperature close to that near the die opening. This is a prior art well known to those skilled in the art and will not be described in detail in this embodiment.

[0040] Compared with the existing technology, the technical solution described in this embodiment has the following advantages: while reducing the generation of extensions, the extensions that are inevitably adhered to the cable sheath are removed, and through the coordinated cooperation of blowing and exhausting, a wind track is formed that can blow off and recover the extensions, avoiding the problem of cable quality degradation caused by excessive extensions. Furthermore, the air volume and temperature can be adjusted.

[0041] Example 2

[0042] The difference between this embodiment and the first embodiment is that the blowing structure is arranged in a ring shape, as follows:

[0043] The blowing pipe 312 is a ring pipe, and the air nozzles 313 are provided in plurality and distributed in a ring shape on the outer periphery of the cable a.

[0044] In this embodiment, the blowing pipe 312 surrounds the circumference of the cable, and the air nozzles 313 are evenly distributed on the blowing pipe 312 to provide multi-angle wind to the cable surface, avoiding dead corners that cause the residue of extensions, or avoiding one-way airflow that causes the extensions to accumulate on the other side.

[0045] Compared with the prior art, the technical solution described in this embodiment has the advantages of further reducing the situation where the extension adheres to the cable surface, and through the synchronous action of multi-directional and multi-flow air, it further stabilizes the wind track while expanding the effect.

[0046] Example 3

[0047] As attached Figure 4 As shown in FIG5 , this embodiment adds a bristle unit that cooperates with the air duct unit on the basis of the above embodiment, as follows:

[0048] The extruder head for preventing adhesion of extensions also includes a brush unit 4 arranged on the shell 1 and located on the outer peripheral side of the cable a; the brush unit 4 includes a plurality of mounting posts 41 arranged on the peripheral side of the die mouth of the mold 2 and distributed in a ring shape, and bristles 42 installed on the mounting posts 41.

[0049] In this embodiment, the mounting post 41 is preferably arranged parallel to the cable, or the end is arranged inclined toward the cable, and the bristles 42 are wrapped on the surface of the mounting post 41. When the cable is continuously produced from the mold die, the bristles 42 are in contact with the cable surface, and there is relative movement between the two, providing the duct unit with the function of assisting in shedding extensions; the bristles 42 are preferably high-temperature resistant bristles, such as PA66 nylon bristles, PA46, etc., all of which have good temperature resistance and wear resistance.

[0050] As a preference of this embodiment, the bristle unit 4 further includes a rotating sleeve 43 rotatably disposed on the mounting post 41 for mounting the bristles 42 , and a blocking ring 44 disposed at the end of the mounting post 41 away from the mold 2 .

[0051] In this embodiment, the bristles 42 are installed on the rotating sleeve 43. Under the action of the wind force of the blowing structure 31, the rotating sleeve 43 rotates relative to the mounting column 41. Therefore, the bristles 42 not only have a horizontal relative movement with the cable, but also have a vertical relative movement, which further increases the auxiliary falling effect on the extension object. The blocking ring 44 prevents the rotating sleeve 43 from falling off the mounting column 41 due to the inclined wind force.

[0052] As a preference of this embodiment, a smooth layer is provided on the inner surface of the rotating sleeve 43 and the outer surface of the mounting post 41 .

[0053] In this embodiment, the smooth layer is preferably a polytetrafluoroethylene coating, which is wear-resistant and reduces friction between the rotating sleeve 43 and the mounting post 41 .

[0054] Compared with the prior art, the technical solution described in this embodiment has the advantages of effectively utilizing the power of the air duct unit and assisting the shedding of the extension through a simple structure, thereby achieving a better effect.

[0055] While the embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to the embodiments described above. Various modifications are possible within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. These modifications are non-inventive and are protected by patent law as long as they fall within the scope of the claims of the present invention.

Claims

1. An extruder head for preventing epitaxial material from sticking, characterized in that: The invention comprises a housing (1), a mold (2) arranged in the housing (1) for producing a cable (a), and an air duct unit (3) arranged at the die opening of the mold (2); the air duct unit (3) comprises a blowing structure (31) arranged on the housing (1) and blowing air toward the cable (a), and an exhaust structure (32) arranged below the cable (a) and for recovering an extension at the die opening of the mold (2).

2. The extruder head for preventing epitaxial material from sticking according to claim 1, characterized in that: The blowing structure (31) comprises a first blower (311), a blowing pipe (312) arranged on the housing (1) and located outside the cable (a), an air nozzle (313) arranged on the blowing pipe (312) and facing the cable (a), and an air supply pipe (314) connecting the first blower (311) and the blowing pipe (312).

3. The extruder head for preventing epitaxial material from sticking according to claim 2, characterized in that: The blowing pipe (312) is a ring pipe, and a plurality of the air nozzles (313) are provided and distributed in a ring shape on the outer peripheral side of the cable (a).

4. The extruder head for preventing epitaxial material from sticking according to claim 2, characterized in that: The blowing structure (31) further includes a pressure valve (315) provided on the air supply pipe (314).

5. The extruder head for preventing epitaxial material from sticking according to claim 2, characterized in that: The blowing structure (31) further includes a temperature sensor (316) disposed in the blowing pipe (312) and a heating element (317) disposed on the air supply pipe (314).

6. The extruder head for preventing epitaxial material from sticking according to claim 1, characterized in that: The exhaust structure (32) comprises a second fan (321), a recovery hopper (322) provided at the lower end of the die opening of the mold (2), and an exhaust pipe (323) for connecting the second fan (321) and the recovery hopper (322).

7. The extruder head for preventing epitaxial material from sticking according to claim 1, characterized in that: It also includes a brush unit (4) arranged on the housing (1) and located on the outer peripheral side of the cable (a).

8. The extruder head for preventing epitaxial material from sticking according to claim 7, characterized in that: The bristle unit (4) comprises a plurality of mounting posts (41) arranged on the periphery of the die opening of the mold (2) and distributed in a ring shape, and bristles (42) mounted on the mounting posts (41).

9. The extruder head for preventing epitaxial material from sticking according to claim 8, characterized in that: The bristle unit (4) further comprises a rotating sleeve (43) rotatably arranged on the mounting post (41) for mounting the bristles (42), and a blocking ring (44) arranged at the end of the mounting post (41) away from the mold (2).

10. The extruder head for preventing epitaxial material from sticking according to claim 9, characterized in that: A smooth layer is provided on the inner surface of the rotating sleeve (43) and the outer surface of the mounting post (41).

Images