Dispensing valve based cable jacket overmolding color change feed device

Abstract

The present application relates to cable sheathing technology field, disclose a kind of based on distribution valve's optical cable sheathing color-changing feed device, including, with the throat of extruder communication main pipeline, further include: two respectively with different color color masterbatch warehouse communication branch pipeline, and two branch branch pipeline with the main pipeline form Y shape convergence section in the way of oblique insertion;Main valve and two branch valves in branch pipeline are located in main pipeline, and two branch valves can switch start-stop closure;Between the round shell connected between main pipeline and extruder, the inner cavity is opened in the round shell, and the inside of the inner cavity is installed with rotatable adjustment cylinder.The fixed dead space between "Y shape convergence section-extruder throat" is replaced by 180 ° rotatable cross valve core in the present application, and horizontal pressure difference airflow is formed by using the same mechanical stroke to drive piston cylinder at switching moment, old material in switching channel is blown out as a whole, and the effect of physical cutting old material section and transition length shortening is achieved.

Description

Technical Field

[0001] This invention relates to the field of optical cable sheathing technology, specifically to an optical cable sheathing color-changing feeding device based on a distribution valve. Background Technology

[0002] Secondary sheathing of optical cables is an important step in the production process. When different colors of sheaths need to be formed, the color of the sheath needs to be changed according to the color spectrum requirements. The current practice is to open a separate masterbatch branch on the feed side of the main material (natural PBT), and mix the pigment particles into the base material in proportion through a loss-in-weight weigher or masterbatch machine, and then let them fall into the extruder screw together.

[0003] For example, Chinese Patent Publication No. CN223199502U discloses a quick color-changing device for secondary coating of optical cables. This device, through its color-changing components, can release color masterbatch by rotating the color-changing knob, thereby facilitating the mixing of the base material and the color masterbatch and achieving quick color changing. Moreover, the overall structure is compact and does not require additional space on the upper part of the screw extruder, making it convenient to use.

[0004] However, regardless of the initial approach or the approach described above, there will always be a dead zone between the main pipeline and the extruder. This dead zone contains a mixture of the main base material and the old color masterbatch. When switching to the new color masterbatch, the mixture of the new color masterbatch and the main base material will be placed after the mixture in the dead zone. The material in the dead zone also needs to be pushed into the extruder. This will not only extend the subsequent transition length, but also extend the time for switching to the new material, thus reducing the efficiency of subsequent work. Summary of the Invention

[0005] The purpose of this invention is to provide a fiber optic cable sheathing and color-changing feeding device based on a distribution valve, so as to solve at least one technical problem existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fiber optic cable sheathing and color-changing feeding device based on a distribution valve, comprising a main pipe connected to the throat of an extruder, and further comprising:

[0007] Two branch pipes are connected to masterbatch silos of different colors respectively, and the two branch pipes are inserted at an angle to form a Y-shaped confluence with the main pipe;

[0008] The main valve is located in the main pipeline and the branch valves are located in the two branch pipelines, and the two branch valves can be switched to open, close, or stop.

[0009] A circular shell is connected between the main pipe and the extruder. The circular shell has an inner cavity, and a rotatable and adjustable cylinder is installed inside the inner cavity. The cylinder has a switching channel along the diameter direction. When the switching channel is in a vertical state, the main pipe and the extruder are connected.

[0010] The horizontal tube is fixed to the outer wall of the circular shell and is connected to the horizontal tube when the switching channel is in a horizontal state.

[0011] Optionally, the outer wall of the circular shell is also integrally formed with a T-shaped plate, and a crossbar is horizontally slidably installed on the outer wall of the T-shaped plate. The crossbar is reciprocated and adjusted by an electric slider. A pressure block is fixed on the top outer wall in the middle of the crossbar. A trigger switch is installed on the center outer wall of the T-shaped plate. The trigger switch controls the main valve to open only when the pressure block contacts the trigger switch.

[0012] It also includes two sets of switch assemblies that are symmetrically designed about the T-shaped plate, and the two sets of switch assemblies are electrically connected to two branch valves respectively. The switch assembly includes a stop switch and an open switch located on both sides of the trigger switch, and the stop switch is located closer to the trigger switch.

[0013] Optionally, the cylinder has a rotating shaft that extends out of the cylindrical shell, and a fixing rod is fixed on the rotating shaft. The fixing rod is arranged parallel to the switching channel. A sliding plate is vertically slidably installed on the outer wall of the cylindrical shell, and a slot with an inner diameter the same as the width of the fixing rod is opened at the bottom of the sliding plate. A connecting rod is rotatably connected between the sliding plate and the crossbar, and a tension spring is rotatably connected between the crossbar and the fixing rod. Stop pins for limiting the fixing rod are fixed on the outer walls of the cylindrical shell on both sides of the fixing rod.

[0014] Optionally, the horizontal tube section includes two horizontal tubes that are respectively fixedly connected to the outer wall of the circular shell, and the horizontal tubes are located in the diameter direction of the switching channel. Both sides of the T-shaped plate are fixed with piston cylinders, and both ends of the cross rod inserted into the two piston cylinders are fixed with piston plates. The two piston cylinders are respectively connected to the two horizontal tubes through vent pipes.

[0015] Optionally, the free ends of both horizontal tubes are set as bent sections, and bent downwards.

[0016] Optionally, elastic protrusions are installed on the outer walls of the circular shells on both sides of the fixing rod, and when the fixing rod is vertically downward, the two elastic protrusions respectively make limiting contact with the two sides of the fixing rod.

[0017] Optionally, both free ends of the horizontal tubes are threaded with removable plugs.

[0018] Optionally, the inner diameter of the switching channel is larger than the inner diameter of the horizontal tube, and when the switching channel is connected to the horizontal tube, the horizontal tube is flush with the bottom inner wall of the switching channel.

[0019] Optionally, the bottom end of the main pipe is sealed and inserted into the circular shell, and the bottom of the circular shell is also sealed and inserted into the feed port at the throat of the extruder.

[0020] Optionally, the circular shell consists of two half-shells that can be disassembled and assembled by bolts.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] I. This invention replaces the fixed dead cavity between the traditional Y-shaped confluence section and the extruder throat with a cross valve core that can rotate 180°. Through a crossbar-connecting rod-rack mechanical chain, the color masterbatch switching action is sequentially completed with the valve core rotation and lateral blowing. At the moment of rotation, the lateral hole aligns with the two horizontal tubes, and the high-speed unidirectional airflow is formed by the pressure difference of the piston cylinder, which blows out the old material in the switching channel as a whole, which is equivalent to "cutting" the old material section. This allows the subsequent new material to reach the extruder directly without having to push and sweep the residual material, further shortening the length of the transition section.

[0023] Second, this invention uses a combination of mechanical delay and elastic protrusions to ensure that the lateral airflow is released instantaneously at the peak of the pressure difference. Furthermore, the inner diameter of the horizontal pipe is smaller than that of the switching channel and the bottom surface is flush with it, achieving the effects of "no step residue of old materials, improved cleaning efficiency and elimination of color difference tails". Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0025] Figure 2 These are the main view and a partially enlarged view of the present invention;

[0026] Figure 3 This is a front sectional view of the present invention;

[0027] Figure 4 This is a disassembled perspective view of the circular shell of the present invention;

[0028] Figure 5 This is an enlarged perspective view of the cylinder of the present invention;

[0029] Figure 6 This is a schematic diagram showing the state of the crossbar after it has been moved according to the present invention;

[0030] Figure 7 This is a control block diagram of the pressure block of the present invention;

[0031] Figure 8 This is a schematic diagram of the cylinder rotating 90 degrees according to the present invention;

[0032] Figure 9 This is a cross-sectional perspective view of the piston cylinder of the present invention.

[0033] In the diagram: 1. Extruder; 2. Main pipe; 3. Branch pipe; 4. Inner cavity; 5. Round shell; 6. Cylindrical; 7. Switching channel; 8. Horizontal pipe; 9. T-plate; 10. Vent pipe; 11. Piston cylinder; 12. Crossbar; 13. Fixing rod; 14. Slide plate; 15. Connecting rod; 16. Tension spring; 17. Elastic protrusion; 18. Stop pin; 19. Pressure block; 20. Close switch; 21. Open switch; 22. Trigger switch. Detailed Implementation

[0034] 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.

[0035] Please see Figures 1 to 9 The present invention provides a technical solution: a fiber optic cable sheathing and color-changing feeding device based on a distribution valve, comprising a main pipe 2 connected to the throat of an extruder 1, and further comprising:

[0036] Two branch pipes 3 are connected to different color masterbatch bins respectively, and the two branch pipes 3 form a Y-shaped confluence with the main pipe 2 in an oblique manner;

[0037] The main valve is located in the main pipeline 2 and the branch valves are located in the two branch pipelines 3, and the two branch valves can be switched to open, close, or stop.

[0038] A circular shell 5 is connected between the main pipe 2 and the extruder 1. The circular shell 5 has an inner cavity 4. A rotatable and adjustable cylinder 6 is installed inside the inner cavity 4. The cylinder 6 has a switching channel 7 along the diameter direction. When the switching channel 7 is in a vertical state, the main pipe 2 and the extruder 1 are connected.

[0039] The horizontal tube is fixed to the outer wall of the circular shell 5 and is connected to the horizontal tube when the switching channel 7 is in a horizontal state.

[0040] When in use, the color-changing feeding device feeds the main base material into the extruder 1 through the main pipe 2, while the branch pipe 3 injects the required color masterbatch. The two are mixed at the Y-shaped confluence point before being injected into the extruder 1. This main pipe + branch pipe configuration creates a Y-shaped feed outside the machine. The Y-shaped convergence method is also a mainstream practice in many factories. Its purpose is to evenly entrain the color masterbatch into the main feed stream, avoiding "one-sided material swallowing" and "drifting of the landing point." However, this method always creates a "dead zone" between the Y-shaped convergence point and the extruder. This dead zone contains a mixture of the main base material and the old color masterbatch. When switching to a new color masterbatch, the mixture of the new color masterbatch and the main base material will be placed after the mixture in the "dead zone," requiring the material in the "dead zone" to be pushed into the extruder as well. This not only prolongs the subsequent transition length but also delays the new material switching time. Therefore, to improve switching efficiency, if the mixture of old material in the "dead zone" can be cleaned up simultaneously during switching, the material changeover time can be shortened, and the color change waste will be reduced. The specific method is as follows:

[0041] First, the "dead zone" section is replaced by a round shell 5 and a cylinder 6. The switching channel 7 opened in the cylinder 6 is used to replace the "dead zone" section. During the normal feeding stage, the main valve of the main pipe 2 and the branch valve of one of the branch pipes 3 are opened. The mixed base material and color masterbatch are mixed at the Y-shaped junction and then enter the extruder 1 through the switching channel 7.

[0042] When a color change is needed, the main pipe 2 and branch pipe 3 are first closed via the main valve and branch valve to stop the material feeding. After all the old material in the main pipe 2 above the cylindrical shell 5 has entered the switching channel 7, the cylinder 6 is rotated to a horizontal position by the external structure control, connecting it to the horizontal pipe section. At the same time, the "dead zone" is disconnected, allowing the old material in the switching channel 7 to be discharged through the horizontal pipe section, which is equivalent to physically "cutting off" the old material section. Figure 8 As shown, when cylinder 6 rotates back to a vertical position, the "dead zone" segment will become an empty segment.

[0043] Then, after the main valve and branch valve are switched, the main pipe 2 and branch pipe 3 are opened, the base material and the new color masterbatch fall and mix, and the new material can directly enter the extruder 1, reducing the old material section in the "dead zone" section. This not only shortens the transition meter length, but also improves the color change efficiency.

[0044] It is worth mentioning that, see Figure 3There is a small segment between the cylindrical shell 5 and the extruder 1. The purpose of this segment is to reserve a small connecting section instead of directly connecting the switching channel 7 to the extruder 1. This allows the base material and the new masterbatch to connect with the reserved connecting section after they fall and mix. This avoids the feeding discontinuity caused by the cutting of the cylinder 6 at the feed inlet during the switching process, thus ensuring the continuity of the subsequent transition and reducing air bubbles in the extruder 1.

[0045] In one preferred embodiment, an implementation method for controlling the opening or closing of the main valve and two branch valves is provided;

[0046] The outer wall of the round shell 5 is also integrally formed with a T-shaped plate 9. A crossbar 12 is horizontally slidably installed on the outer wall of the T-shaped plate 9, and the crossbar 12 is reciprocated and adjusted by an electric slider. A pressure block 19 is fixed on the top outer wall in the middle of the crossbar 12. A trigger switch 22 is installed on the center outer wall of the T-shaped plate 9, and the trigger switch 22 controls the main valve to open only when the pressure block 19 contacts the trigger switch 22.

[0047] It also includes two sets of switch assemblies that are symmetrically designed about the T-shaped plate 9, and the two sets of switch assemblies are electrically connected to the two branch valves respectively. The switch assemblies include a closing switch 20 and an opening switch 21 located on both sides of the trigger switch 22, and the closing switch 20 is located closer to the trigger switch 22.

[0048] For details, please refer to [link / reference]. Figure 2 During the normal feeding stage, the crossbar 12 is in the middle position, and the pressure block 19 on it is always in contact with the trigger switch 22. The trigger switch 22 controls the main valve to be in the open state, that is, the main pipe 2 is in the connected state, and one of the branch pipes 3 is also in the open state.

[0049] During the switching process, the main pipe 2 and the old material branch pipe 3 must first be closed, and then the main pipe 2 and the new material branch pipe 3 must be opened. Therefore, the T-shaped plate 9 moves to one side under the drive of the electric slider. Figure 2 Taking the rightward shift as an example, firstly, when the pressure block 19 disengages from the trigger switch 22, the trigger switch 22 controls the main valve to close, thus closing the main pipeline 2. Secondly, when the pressure block 19 contacts the shut-off switch 20 shown in A1, the shut-off switch 20 controls the corresponding branch valve to close, thereby closing the branch pipeline 3 for the old material. Figure 6 As shown in the state, when the pressure block 19 finally contacts the open switch 21 shown in B, the open switch 21 controls the corresponding branch valve to open, that is, the branch pipe 3 of the new material opens. At this time, the new color masterbatch will fall first. Then, as the crossbar 12 resets and the pressure block 19 contacts the trigger switch 22 again, the main pipe 2 opens again, completing the switching process between the new and old materials.

[0050] Furthermore, it is worth mentioning that after switching, the new color masterbatch will fall first. This allows the "dead zone" section after being cleared to be occupied by the "new color masterbatch" before merging with the main material. This ensures that the "dead zone" section has a color masterbatch with a concentration close to the target concentration from the very beginning after switching. As soon as the main material is connected, it is fully wound, significantly shortening the "long tail" of the color difference and further shortening the length of the transition section.

[0051] Similarly, when switching again, it is necessary to control the horizontal bar 12 to move in the opposite direction for adjustment, which will not be described in detail here;

[0052] See Figure 2 In the diagram, A and A1 control the start and stop of the first set of branch valves, while B and B1 control the start and stop of the second set of branch valves. The two control structures are symmetrically designed about the trigger switch 22. Their functions are detailed in the diagram. Figure 7 As shown.

[0053] In one preferred embodiment, an implementation method is provided that can control the rotation adjustment of the cylinder 6;

[0054] A rotating shaft is fixed to the center of the cylinder 6, extending out of the circular shell 5, and a fixing rod 13 is fixed on the rotating shaft. The fixing rod 13 is arranged parallel to the switching channel 7. A sliding plate 14 is vertically slidably installed on the outer wall of the circular shell 5. The bottom of the sliding plate 14 has a groove with an inner diameter the same as the width of the fixing rod 13. A connecting rod 15 is rotatably connected between the sliding plate 14 and the crossbar 12. A tension spring 16 is also rotatably connected between the crossbar 12 and the fixing rod 13. The outer walls of the circular shell 5 on both sides of the fixing rod 13 are fixed with stop pins 18 for limiting the fixing rod 13.

[0055] Specifically, such as Figure 6 As can be seen from the above, when the horizontal bar 12 moves to adjust the valve switching, the horizontal bar 12 moves and drives the slide plate 14 to move upward through the connecting rod 15. At the same time, the slot at its bottom end will gradually disengage from the fixed rod 13 until it is completely disengaged and the limitation on the fixed rod 13 is released. Meanwhile, the tension spring 16 between the horizontal bar 12 and the fixed rod 13 will provide a steering force to the fixed rod 13, thereby causing the fixed rod 13 and the cylinder 6 to rotate 90 degrees, completing the process of switching the switching channel 7 from the vertical state to the horizontal state. The design of the stop pin 18 is to limit the rotation angle. In this way, when the horizontal bar 12 moves to the end (that is, when the pressure block 19 contacts A / B), the old material mixture in the switching channel 7 can also be discharged through the horizontal pipe. At this time, the branch pipe 3 of the new material is opened. However, since the switching channel 7 has not been reset, the fallen new color masterbatch will accumulate in the micro-segment between the Y-shaped junction and the round shell 5.

[0056] When the crossbar 12 moves to reset, the slide plate 14 will move down under the action of the connecting rod 15. When the edge of the slot at its bottom contacts the fixed rod 13, it will push the fixed rod 13 to rotate back to the vertical position. The slot will then be placed on the fixed rod 13 again, completing the reset and locking of the fixed rod 13. At the same time, the cylinder 6 also completes the reset and rotation, and the switching channel 7 also rotates back to the vertical position. As the new color masterbatch falls into the switching channel 7, the main pipe 2 also opens again, completing the filling of the switching channel 7 ("dead zone").

[0057] In this way, through the cooperation between the structures, the old material in the "dead zone" section can be cleaned up synchronously during the valve switching interval, further shortening the color change time.

[0058] In one preferred embodiment, an implementation of the horizontal tube section is provided;

[0059] The horizontal tube section includes two horizontal tubes 8 that are respectively fixed and connected to the outer wall of the circular shell 5. The horizontal tubes 8 are located in the diameter direction of the switching channel 7. Piston cylinders 11 are fixed on both sides of the T-shaped plate 9. Piston plates are fixed at both ends of the cross rod 12 inserted into the two piston cylinders 11. The two piston cylinders 11 are respectively connected to the two horizontal tubes 8 through the vent pipe 10.

[0060] For details, please refer to [link / reference]. Figure 8 and Figure 9 During the movement and adjustment of the crossbar 12, the movement of the crossbar 12 will cause the two piston plates to slide inside the two piston cylinders 11. One of them will press the internal air into the corresponding horizontal tube 8 through the vent pipe 10 to increase its internal air pressure, while the other will extract the air from the corresponding horizontal tube 8 through the vent pipe 10 to reduce its internal air pressure. The superposition of the two will create a large pressure difference in the two horizontal tubes 8. Therefore, when the switching channel 7 rotates to the horizontal state, a transverse airflow will be generated under the action of the pressure difference in the two horizontal tubes 8. The transverse airflow will be used to move the old material in the switching channel 7 to the low-pressure area, thereby completing the purpose of cleaning the old material in the switching channel 7.

[0061] In one preferred embodiment, the free ends of both horizontal tubes 8 are set as bent sections and bent downwards.

[0062] Both horizontal tubes 8 have removable plugs installed at their free ends via threads.

[0063] By setting the end of the horizontal pipe 8 as a downward bend, the old material mixture can be placed at the bend, which makes it easier to discharge the material after the plug is removed, and avoids the residue of old material at the position of the horizontal pipe.

[0064] In one preferred embodiment, elastic protrusions 17 are installed on the outer walls of the circular shells 5 on both sides of the fixing rod 13, and when the fixing rod 13 is vertically downward, the two elastic protrusions 17 respectively make limiting contact with the two sides of the fixing rod 13.

[0065] For details, please refer to [link / reference]. Figure 6 By designing the elastic protrusion 17, the fixed rod 13 can be delayed in rotation. That is, after the slot at the bottom of the slide plate 14 is disengaged from the fixed rod 13, although the tension spring 16 applies a pulling force, the locking effect of the elastic protrusion 17 will delay its movement until the crossbar 12 moves to the end and the tension spring 16 applies the maximum pulling force to the fixed rod 13. At this time, the limiting effect of the elastic protrusion 17 can be broken, and the fixed rod 13 and the switching channel 7 can be rotated and switched. This can further extend the connection time between the two horizontal pipes 8, making the pressure difference between the two horizontal pipes 8 greater, and thus making the airflow speed between them faster. This further improves the effect of removing old materials in the switching channel 7, making the cleaning more thorough.

[0066] In one preferred embodiment, the inner diameter of the switching channel 7 is larger than the inner diameter of the horizontal tube 8, and when the switching channel 7 is connected to the horizontal tube 8, the horizontal tube 8 is flush with the inner wall of the bottom surface of the switching channel 7.

[0067] like Figure 8 As shown, when the inner diameter of the switching channel 7 is the same as the inner diameter of the horizontal pipe 8, when the old material above the switching channel 7 is carried away by the airflow, the two horizontal pipes 8 will be directly connected. Therefore, the old material below may remain in the switching channel 7. Therefore, the inner diameter of the horizontal pipe 8 is designed to be smaller than the inner diameter of the switching channel 7, and the bottom inner wall is flush when connected. This can minimize the old material residue in the switching channel 7 and further improve the cleaning effect.

[0068] In one preferred embodiment, the bottom end of the main pipe 2 is sealed and inserted into the circular shell 5, and the bottom of the circular shell 5 is also sealed and inserted into the feed port at the throat of the extruder 1. See [link to details]. Figure 3 and Figure 8 .

[0069] In one preferred embodiment, the circular shell 5 consists of two half-shells that can be disassembled and assembled using bolts, as detailed in [reference needed]. Figure 4 .

[0070] The standard parts used in this embodiment can be purchased directly from the market, while the non-standard structural parts described in the specification and drawings can be processed directly based on existing technical knowledge without any doubt. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0071] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fiber optic cable sheathing and color-changing feeding device based on a distribution valve, comprising: The main pipe (2) connected to the throat of the extruder (1) is characterized in that it further includes: Two branch pipes (3) are connected to different color masterbatch bins respectively, and the two branch pipes (3) form a Y-shaped confluence with the main pipe (2) in an oblique manner; The main valve is located in the main pipeline (2) and the branch valves are located in the two branch pipelines (3), and the two branch valves can be switched to start, stop and close. A circular shell (5) is connected between the main pipe (2) and the extruder (1). The circular shell (5) has an inner cavity (4) inside. A rotatable and adjustable cylinder (6) is installed inside the inner cavity (4). The cylinder (6) has a switching channel (7) along the diameter direction. When the switching channel (7) is in a vertical state, the main pipe (2) and the extruder (1) are connected. The horizontal tube is fixed to the outer wall of the round shell (5) and is connected to the horizontal tube when the switching channel (7) is in a horizontal state; The outer wall of the round shell (5) is also integrally formed with a T-shaped plate (9). A horizontal bar (12) is horizontally slidably installed on the outer wall of the T-shaped plate (9). The horizontal bar (12) is reciprocated and adjusted by an electric slider. A pressure block (19) is fixed on the top outer wall in the middle of the horizontal bar (12). A trigger switch (22) is installed on the center outer wall of the T-shaped plate (9). The trigger switch (22) controls the main valve to open only when the pressure block (19) contacts the trigger switch (22). It also includes two sets of switch assemblies that are symmetrically designed about the T-shaped plate (9), and the two sets of switch assemblies are electrically connected to two branch valves respectively. The switch assemblies include a closing switch (20) and an opening switch (21) located on both sides of the trigger switch (22), and the closing switch (20) is located closer to the trigger switch (22). The horizontal tube section includes two horizontal tubes (8) that are respectively fixed and connected to the outer wall of the circular shell (5), and the horizontal tubes (8) are located in the diameter direction of the switching channel (7). Piston cylinders (11) are fixed on both sides of the T-shaped plate (9). Piston plates are fixed at both ends of the cross rod (12) inserted into the two piston cylinders (11), and the two piston cylinders (11) are respectively connected to the two horizontal tubes (8) through the vent pipe (10).

2. The optical cable sheathing and color-changing feeding device based on a distribution valve according to claim 1, characterized in that: The cylinder (6) has a rotating shaft that extends out of the circular shell (5) and a fixing rod (13) fixed on the rotating shaft. The fixing rod (13) is arranged parallel to the switching channel (7). The outer wall of the circular shell (5) is also vertically slidably mounted with a sliding plate (14). The bottom of the sliding plate (14) has a slot with an inner diameter the same as the width of the fixing rod (13). The sliding plate (14) is rotatably connected to the crossbar (12) by a connecting rod (15). The crossbar (12) is also rotatably connected to the fixing rod (13) by a tension spring (16). The outer walls of the circular shell (5) on both sides of the fixing rod (13) are fixed with stop pins (18) for limiting the fixing rod (13).

3. The optical cable sheathing and color-changing feeding device based on a distribution valve according to claim 1, characterized in that: The free ends of both horizontal tubes (8) are set as bent sections and bent downwards.

4. The optical cable sheathing and color-changing feeding device based on a distribution valve according to claim 2, characterized in that: Elastic protrusions (17) are installed on the outer walls of the round shells (5) on both sides of the fixed rod (13), and when the fixed rod (13) is vertically downward, the two elastic protrusions (17) respectively make limiting contact with the two sides of the fixed rod (13).

5. The optical cable sheathing and color-changing feeding device based on a distribution valve according to claim 1, characterized in that: Both of the free ends of the horizontal tubes (8) are fitted with removable plugs by threads.

6. The optical cable sheathing and color-changing feeding device based on a distribution valve according to claim 1, characterized in that: The inner diameter of the switching channel (7) is larger than the inner diameter of the horizontal tube (8), and when the switching channel (7) is connected to the horizontal tube (8), the bottom inner wall of the horizontal tube (8) is flush with the inner wall of the switching channel (7).

7. The optical cable sheathing color-changing feeding device based on a distribution valve according to any one of claims 1-6, characterized in that: The bottom end of the main pipe (2) is sealed and inserted into the round shell (5), and the bottom of the round shell (5) is also sealed and inserted into the feed port at the throat of the extruder (1).

8. The optical cable sheathing color-changing feeding device based on a distribution valve according to any one of claims 1-6, characterized in that: The circular shell (5) consists of two half-shells that can be disassembled and assembled by bolts.

Images