Double-layer double-color melt extrusion coloring device

Abstract

The double-layer and double-color melt extrusion coloring device comprises a mounting block, a separation pipe and a feeding hopper, a mounting opening is formed in the mounting block, a first pigment hole and a second pigment hole are formed in the mounting block, the first pigment hole and the second pigment hole communicate with the mounting opening, the separation pipe is inserted into the mounting opening, and the feeding hopper is arranged on the separation pipe. A coloring groove is formed in the outer wall of the separation pipe in the circumferential direction, a flow dividing groove communicating with the coloring groove is formed in the separation pipe, a first feeding hole is formed in the separation pipe, one end of the first feeding hole communicates with the flow dividing groove, and a lineation groove is formed in the outer wall of the separation pipe in the axial direction of the separation pipe. A communicating arc groove is formed in the outer ring wall of the separation pipe in the circumferential direction of the separation pipe and communicates with the lineation groove, one end of the lineation groove communicates with the second feeding hole, and the separation pipe is provided with the second feeding hole. The device has the effects of achieving integrated operation of the coloring and scribing steps and reducing the overall structural size of the device.

Description

Technical Field

[0001] This application relates to the technical field of cable processing, and in particular to a double-layer, double-color melt extrusion coloring device. Background Technology

[0002] When processing cables, different pigments need to be coated on the outside of the cables according to the needs of use, so as to achieve the functions of insulation and safety marking, which helps to improve the safety of cable use, and at the same time facilitates operation and maintenance management and standardized production processes.

[0003] Currently, it is sometimes necessary to coat the cable surface with double layers or two colors of pigment as required. This is typically achieved by connecting two melt extrusion devices to the glue dispensing head, thus creating a double-layer cable insulation through two coating processes. Because the two cable insulation materials have different densities, they do not mix in the molten state, preventing product quality issues. Furthermore, the double insulation layers adhere well in the molten state. However, if the inner layer has already solidified, the outer molten adhesive insulation material will not adhere stably to the solidified insulation surface, making it prone to peeling during use. For coloring the two-color pigment insulation layer, a strip injection machine and a distribution tank need to be added to the end of the device for zoned coloring, allowing for marking operations on the already pigmented cable surface.

[0004] Regarding the aforementioned technologies, the inventors believe that the introduction of a new marking device during the coating process of two-color pigments increases the overall size of the device, the space occupied, and the installation difficulty, leading to increased difficulty in adjusting and operating the equipment, and also increasing the cost of device maintenance. Summary of the Invention

[0005] In order to integrate the coloring and marking steps and reduce the overall structural volume of the device, this application provides a double-layer, double-color melt extrusion coloring device.

[0006] The dual-layer, dual-color melt extrusion coloring device provided in this application adopts the following technical solution: A double-layer, dual-color melt extrusion coloring device includes a mounting block, a separating tube, and a feeding hopper. The mounting block has a horizontally extending mounting port, one end of which is a feed inlet and the other end a discharge outlet. A first pigment hole is vertically formed on the top surface of the mounting block, and a second pigment hole is horizontally formed on the vertical sidewall of the mounting block. The first pigment hole is located on the side of the second pigment hole closest to the feed inlet. Both the first and second pigment holes communicate with the mounting port. The separating tube is inserted into the mounting port. A coloring groove is formed circumferentially on the outer wall of the separating tube, and several coloring grooves are formed on the outer wall of the separating tube. The system includes a flow divider, a first feeding hole on the separating tube along its radius, one end of the first feeding hole extending to the inner annular wall of the separating tube and the other end communicating with the flow divider, a scribing groove on the outer wall of the separating tube along its axial direction, a connecting arc groove on the outer annular wall of the separating tube along its circumference, one end of the connecting arc groove communicating with the scribing groove, and the end of the scribing groove away from the connecting arc groove communicating with the second feeding hole, and a plurality of second feeding holes on the separating tube along its radius, one end of each second feeding hole being flush with the inner annular wall of the separating tube and the other end communicating with the connecting arc groove.

[0007] By adopting the above technical solution, during the cable coloring process, the main pigment is injected from the hopper and enters the gap between the mounting port and the coloring tank through the first pigment hole. The main pigment flows from the coloring tank into various distribution channels and is injected into the inner cavity of the separator tube from multiple directions through several first feeding holes. The cable to be processed passes through the inside of the separator tube from the inlet end to the outlet end, and the cable comes into contact with the main pigment flowing out of the several first feeding holes, which coats the surface of the cable. The secondary pigment enters the marking groove through the second pigment hole and is coated onto the surface of the fully colored cable through the connecting arc groove and the second feeding hole in sequence. As the cable moves, the secondary pigment forms multiple straight lines on the cable surface, realizing the simultaneous operation of coloring and marking. Through the cooperation of the mounting block, the separator tube, and the hopper, the coloring and marking steps are integrated, and the overall structural volume of the device is reduced.

[0008] Optionally, two transmission grooves are formed along the axial direction on the outer ring wall of the separation tube, one end of the transmission groove is connected to the coloring groove, and two diversion grooves are connected to the end of each transmission groove away from the coloring groove. A first diversion plate is provided on the inner wall of the coloring groove along the axial direction of the separation tube, and the position of the first diversion plate corresponds to the first pigment hole.

[0009] By adopting the above technical solution, the pigment entering the installation port through the first pigment hole is dispersed into two branches under the action of the first diverter plate, which facilitates the uniform and simultaneous entry of the main pigment into the two transmission slots, and makes it easier for the main pigment to be uniformly coated on the cable surface from all directions at the same time, which helps to improve the coating quality of the pigment.

[0010] Optionally, a limiting ring is connected to the outer ring wall of the separation tube, and an alignment threaded hole is provided on the outer ring wall of the separation tube. A connecting threaded hole is provided on the mounting block. In the working state, the alignment threaded hole and the connecting threaded hole are connected. A connecting piece is provided in both the alignment threaded hole and the connecting threaded hole. The limiting ring abuts against the outer wall of the mounting block.

[0011] By adopting the above technical solution, when installing the separator tube, the separator tube is inserted into the mounting port of the mounting block, and the limiting ring is pressed against the side wall of the mounting block. The separator tube is rotated until the alignment threaded hole and the connecting threaded hole are aligned, and the separator tube and the mounting block are connected using a connector. The setting of the limiting ring, the connecting threaded hole, and the alignment threaded hole facilitates the precise connection between the separator tube and the mounting block, and avoids the possibility of the separator tube rotating in the mounting port during processing, which could lead to misalignment between the first pigment hole and the coloring tank, and between the second pigment hole and the scribing groove.

[0012] Optionally, the coloring groove is arranged in a ring shape, and two sets of alignment threaded holes are provided on the separation tube, with the two sets of alignment threaded holes spaced 90° apart on the separation tube.

[0013] By adopting the above technical solution, when only single-color coating of the cable is required, rotating the separator tube at a certain angle will misalign the second pigment hole with the marking groove, preventing the flow of pigment. Since the coating groove is annular, after the separator tube is rotated, the first pigment hole remains connected to the coating groove, allowing for normal transmission of the main pigment.

[0014] Optionally, the inner bottom wall of the coloring tank is provided with a receiving groove for accommodating the first diverter plate. One side of the first diverter plate is slidably disposed in the receiving groove. An elastic element is provided in the receiving groove. The elastic element is connected to the first diverter plate. In its natural state, the side of the first diverter plate is flush with the outer ring wall of the separation tube under the action of the elastic element. An adjusting groove is provided on the inner wall of the mounting port. An abutting plate is slidably disposed in the adjusting groove. The position of the abutting plate corresponds to the coloring tank. The thickness of the abutting plate is less than the width of the coloring tank. An adjusting element for adjusting the position of the abutting plate is provided on the mounting block.

[0015] By adopting the above technical solution, when the separating tube rotates to the position of the second pigment hole and the scribing groove being misaligned, the position of the first diverting plate will also rotate to be misaligned with the position of the first pigment hole. At this time, the position of the abutting plate in the adjusting groove is adjusted by the adjusting component. The abutting plate pushes the first diverting plate into the adjusting groove, thus avoiding the first diverting plate from obstructing the flow of pigment. The pigment flows through both sides of the abutting plate.

[0016] Optionally, an axial insertion groove is formed on the outer ring wall of the separating tube at the end away from the limiting ring, and a circumferential rotation groove is formed on the outer ring wall of the separating tube. The rotation groove is set at 90°, and one end of the rotation groove is connected to the end of the insertion groove away from the end of the separating tube. A guide block is connected to the inner ring wall of the mounting port. The guide block is slidably connected to the insertion groove and the rotation groove. When the guide block is located at the end of the rotation groove and the insertion groove that are connected, one set of alignment threaded holes corresponds to the position of the connecting threaded hole. When the guide block is located at the end of the rotation groove away from the insertion groove, the other set of alignment threaded holes corresponds to the position of the connecting threaded hole.

[0017] By adopting the above technical solution, when installing the separator tube, the separator tube is first pushed into the installation port, and the limiting ring is pressed against the side wall of the installation block. At this time, the guide block slides to the position where the insertion groove and the rotating groove connect. When the separator tube rotates to the end of the rotating groove away from the insertion groove, the connecting threaded hole corresponds to one of the sets of aligning threaded holes, and the abutment plate corresponds to the position of the first diverter plate. The setting of the rotating groove, the insertion groove, and the guide block restricts the rotation angle of the separator tube, facilitating the smooth installation process.

[0018] Optionally, two connecting arc grooves are arranged in parallel on the separation tube, and the scribing groove is simultaneously connected to both connecting arc grooves. The two second feeding holes connected to the two connecting arc grooves are arranged one-to-one along the axial direction of the separation tube, and the corresponding two second feeding holes are located on the same straight line along the axial direction on the inner ring wall of the separation tube.

[0019] By adopting the above technical solution, the setting of two sets of connected arc grooves enables repeated coloring of the attached pigment, reducing the possibility of broken lines on the cable surface during the marking process due to the short contact area and contact time between the attached pigment and the cable.

[0020] Optionally, a guide plate is provided in the scribing groove along its length direction, and the thickness of the guide plate is less than the width of the scribing groove.

[0021] By adopting the above technical solution, the design of the guide plate enables uniform distribution of the attached pigment, facilitating the simultaneous marking of multiple lines on the cable surface.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. Through the cooperation of the mounting block, the separation pipe and the injection hopper, the coloring and marking steps can be integrated and the overall structural volume of the device can be reduced. 2. The setting of the limiting ring, connecting threaded hole and alignment threaded hole facilitates the precise connection between the separator tube and the mounting block, and avoids the possibility of the separator tube rotating in the mounting port during the processing, which could lead to misalignment between the first pigment hole and the coloring tank, and misalignment between the second pigment hole and the scribing groove. 3. The two sets of connected arc grooves enable repeated application of the attached pigment, reducing the possibility of broken lines on the cable surface during the scribing process due to the short contact area and contact time between the attached pigment and the cable. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a double-layer, double-color melt extrusion coloring device, as shown in Embodiment 1 of this application.

[0024] Figure 2 This is a partial sectional view of Embodiment 1 of this application, used to illustrate the internal structure of the mounting port.

[0025] Figure 3 This is a partial cross-sectional view used to illustrate the second pigment hole in Embodiment 1 of this application.

[0026] Figure 4 This is a partial sectional view of Embodiment 2 of this application, used to illustrate the internal structure of the mounting port.

[0027] Figure 5 This is a schematic diagram illustrating the structure of the guide block in Embodiment 2 of this application.

[0028] Figure 6 This is a partial cross-sectional view of Embodiment 2 of this application, used to illustrate the abutment plate.

[0029] Figure 7 yes Figure 6 Enlarged view of part A in the middle.

[0030] Figure 8 yes Figure 6 Enlarged view of section B in the middle.

[0031] Explanation of reference numerals in the attached drawings: 1. Mounting block; 101. First pigment hole; 102. Mounting port; 103. Second pigment hole; 104. Adjusting chute; 2. Separation pipe; 21. Coloring tank; 22. Transfer chute; 23. Diverting chute; 24. First feeding hole; 25. Marking groove; 26. Connecting arc groove; 27. Second feeding hole; 28. Receiving chute; 3. Injection hopper; 4. First diverting plate; 5. Limiting ring; 6. Connecting threaded hole; 7. Alignment threaded hole; 8. Second diverting plate; 9. Return spring; 10. Abutment plate; 11. Adjusting screw; 12. Guide block; 13. Insertion chute; 14. Rotating chute; 15. Guide plate. Detailed Implementation

[0032] The following is in conjunction with the appendix Figures 1-8 This application will be further described in detail below. Embodiments of this application provide a double-layer, double-color melt extrusion coloring apparatus, which integrates the coloring and marking steps and reduces the overall structural volume of the apparatus.

[0033] Example 1 Reference Figures 1-3 A double-layer, two-color melt extrusion coloring device includes a mounting block 1, a separation tube 2, and a feeding hopper 3. The mounting block 1 has a horizontally extending mounting port 102 penetrating both ends, with one end of the mounting port 102 serving as the inlet and the other as the outlet. A first pigment hole 101 communicating with the mounting port 102 is formed on the top surface of the mounting block 1, and a second pigment hole 103 communicating with the mounting port 102 is formed on the vertical sidewall of the mounting block 1. The first pigment hole 101 is located on the side of the second pigment hole 103 closest to the inlet end. The feeding hopper 3 is connected to the top surface of the mounting block 1 and is connected to the first pigment hole 101.

[0034] Reference Figure 2 The separating tube 2 is inserted into the mounting port 102, and the outer diameter of the separating tube 2 is equal to the inner diameter of the mounting port 102. A coloring groove 21 is circumferentially formed on the outer ring wall of the separating tube 2, and the coloring groove 21 is 180°. A transmission groove 22 is formed axially on the separating tube 2, with one transmission groove 22 connected to each end of the coloring groove 21. Two diversion grooves 23 are connected to the end of each transmission groove 22 furthest from the coloring end. Several first feeding holes 24 are formed radially on the separating tube 2, and these first feeding holes 24 correspond one-to-one with and are connected to the diversion grooves 23. A first diversion plate 4 is positioned at the middle of the inner wall of the coloring groove 21 along the axial direction of the separating tube 2, and one side of the first diversion plate 4 is flush with the outer ring wall of the separating tube 2.

[0035] Reference Figure 2A scribing groove 25 is provided along its axial direction on the outer ring wall of the separator 2. The scribing groove 25 is located on the side of the coloring tank 21 away from the feed end. A connecting arc groove 26 is provided circumferentially on the outer ring wall of the separator 2. The connecting arc groove 26 is 180 degrees and is connected to the end of the scribing groove 25 away from the feed end. The scribing groove 25 is located in the middle of the connecting arc groove 26. Two second feeding holes 27 are provided along the radial direction on the separator 2. The two second feeding holes 27 correspond one-to-one with the two ends of the connecting arc groove 26 and are connected.

[0036] Reference Figure 1 and Figure 2 A limiting ring 5 is connected to the outer ring wall of the separator tube 2. A pair of connecting threaded holes 6 are provided on the vertical side wall of the mounting block 1. Two corresponding alignment threaded holes 7 are provided on the outer wall of the separator tube 2, which are connected to the connecting threaded holes 6 one by one. Bolts for connection are connected to the connecting threaded holes 6 and the corresponding alignment threaded holes 7. At this time, the first pigment hole 101 is connected to the coloring groove 21 and corresponds to the position of the first diverter plate 4. The second pigment hole 103 is connected to the scribing groove 25.

[0037] Reference Figure 1 and Figure 2 When coating cables, the cables are passed through the separation pipe 2 from the inlet to the outlet, and the main pigment is injected into the first pigment hole 101 through the injection hopper 3. Under the action of the first diversion plate 4, the main pigment flows evenly to the coating tanks 21 on both sides, and then passes through the transmission tank 22, the diversion tank 23 and the first feeding hole 24 in sequence to be evenly and completely coated on the surface of the cable, thus achieving complete and uniform coating of the cable surface.

[0038] Reference Figure 2 and Figure 3 After the cable is fully coated, the pigment flows into the scribing groove 25 through the second pigment hole 103, and then sequentially enters the connecting arc groove 26 and the second feeding hole 27. As the cable moves, the pigment forms two parallel lines on the cable surface, achieving simultaneous coating and scribing processes. The separation tube 2 integrates the coating and scribing processes, helping to reduce the overall size of the device and its footprint. The limiting ring 5 provides axial positioning for the separation tube 2 and the mounting block 1, while the connecting threaded hole 6 and the alignment threaded hole 7 ensure precise positioning of the separation tube 2 and the mounting block 1, preventing relative rotation of the separation tube 2 in the mounting port 102 during processing. The first diverter plate 4 ensures uniform distribution of the main pigment, allowing it to flow simultaneously from several first feeding holes 24 to the cable surface, thus improving the processing quality of the cable.

[0039] The implementation principle of the double-layer dual-color melt extrusion coloring device in Embodiment 1 of this application is as follows: When coloring cables, the cables are passed through the separation pipe 2 along the direction from the inlet to the outlet, and the main pigment is injected into the first pigment hole 101 through the injection hopper 3. Under the action of the first diversion plate 4, the main pigment flows evenly to the coloring tanks 21 on both sides, and then passes through the transmission tank 22, the diversion tank 23 and the first feeding hole 24 in sequence to be evenly and completely coated on the surface of the cable, thus realizing the complete and uniform coloring of the cable surface.

[0040] After the cable is fully coated, the pigment flows into the marking groove 25 through the second pigment hole 103, and then sequentially enters the connecting arc groove 26 and the second feeding hole 27. The pigment forms two parallel lines on the cable surface, realizing the simultaneous operation of the coating and marking process. The separation tube 2 integrates the coating and marking processes, which helps to reduce the overall size of the device and the floor space it occupies.

[0041] Example 2 Reference Figure 4 and Figure 5 The difference between Embodiment 2 and Embodiment 1 is that the coloring tank 21 is arranged in a complete ring shape, and a second diversion plate 8 is arranged in the coloring tank 21 along the length direction of the separation tube 2. The second diversion plate 8 is arranged at a 90° angle to the first diversion plate 4, and the second diversion plate 8 is correspondingly arranged with one of the transmission tanks 22.

[0042] Reference Figure 6 and Figure 7 The inner wall of the coating tank 21 is provided with a receiving groove 28 for accommodating the first diverter plate 4. One side of the first diverter plate 4 is slidably disposed in the receiving groove 28. A return spring 9 is provided in the receiving groove 28. One end of the return spring 9 is connected to the inner bottom wall of the receiving groove 28, and the other end is connected to the first diverter plate 4. In its natural state, the first diverter plate 4 is flush with the outer ring wall of the separation tube 2 under the action of the return spring 9.

[0043] Reference Figure 6 and Figure 8 An adjusting groove 104 is provided on the inner ring wall of the mounting port 102. An abutment plate 10 is slidably disposed in the adjusting groove 104, and the side of the abutment plate 10 near the inside of the mounting port 102 is an abutment arc edge. An adjusting screw 11 is threadedly connected to the mounting block 1. One end of the adjusting screw 11 extends into the adjusting groove 104 and is rotatably connected to the abutment plate 10. When the separating tube 2 rotates to the position where the first pigment hole 101 corresponds to the position of the second separating plate, the first separating plate corresponds to the position of the abutment plate 10, and the thickness of the abutment plate 10 is less than the width of the coloring tank 21.

[0044] Reference Figure 4 and Figure 5The separating tube 2 has two pairs of aligning threaded holes 7. When the connecting threaded hole 6 corresponds to one pair of aligning threaded holes 7, the first diverting plate 4 corresponds to the first pigment hole 101. When the other pair of aligning threaded holes 7 corresponds, the second diverting plate 8 corresponds to the first pigment hole 101. A guide block 12 is connected to the inner wall of the mounting port 102. An insertion groove 13 is formed along the length of the outer ring wall of the separating tube 2 at the end away from the limiting ring 5. A rotating groove 14 is formed along the circumference of the outer ring wall of the separating tube 2. One end of the rotating groove 14 is connected to the insertion groove 13, and the rotating groove 14 is set at 90°. When the guide block 12 is located at the position where the insertion groove 13 and the rotating groove 14 are connected, the first diverting plate 4 corresponds to the first pigment hole 101. When the guide block 12 is located at the end of the rotating groove 14 away from the insertion groove 13, the second diverting plate 8 corresponds to the first pigment hole 101.

[0045] Reference Figure 4 Two connecting arc grooves 26 are arranged parallel to each other on the outer ring wall of the separation tube 2, and the scribing groove 25 is connected to both connecting arc grooves 26. A guide plate 15 is arranged on the inner bottom wall of the scribing groove 25 along the length of the separation tube 2. Two second feeding holes 27 connected to the two connecting arc grooves 26 are arranged one-to-one along the length of the separation tube 2.

[0046] Reference Figure 4 , Figure 5 When only the cable surface needs to be colored, the separating tube 2 is rotated 90°, and the guide block 12 moves to the end of the rotating slide 14 away from the insertion slide 13. The separating tube 2 and the mounting block 1 are positioned by bolts passing through the connecting threaded hole 6 and the corresponding alignment threaded hole 7. At this time, the marking groove 25 and the second pigment hole 103 are staggered, blocking the transmission of the pigment. Because the coloring groove 21 is annular, the first pigment hole 101 remains connected to the coloring groove 21 after the separating tube 2 is rotated. The second diverter plate 8 evenly distributes the main pigment.

[0047] Reference Figure 4 , Figure 7 and Figure 8When installing the separator tube 2, the abutment plate 10 is located in the adjusting groove 104. After the separator tube 2 is installed, the adjusting screw 11 is turned to drive the abutment plate 10 with the abutment arc edge on one side to abut against the inner bottom wall of the coloring tank 21. When the separator tube 2 rotates, the first diverting plate 4 is pushed into the receiving groove 28 by the pushing action of the abutment arc edge, and the return spring 9 is compressed to accumulate elastic potential energy. Since the thickness of the abutment plate 10 is less than the width of the coloring tank 21, the pigment can flow smoothly from both sides of the abutment plate 10. The above structure enables the switching of the coloring state and expands the applicability of the device. The guide block 12, the insertion groove 13, and the rotating groove 14 limit the angle of the separator tube 2.

[0048] Reference Figure 4 The two connected arc grooves 26 enable dual feeding of the attached pigment, reducing the possibility of line breakage due to small contact area and short contact time.

[0049] The implementation principle of the double-layer, double-color melt extrusion coloring device in Embodiment 2 of this application is as follows: When only the surface of the cable needs to be colored, the separating tube 2 is rotated 90°. At this time, the marking groove 25 and the second pigment hole 103 are staggered, blocking the transmission of the pigment. Since the coloring groove 21 is arranged in a ring shape, the first pigment hole 101 remains connected to the coloring groove 21 after the separating tube 2 is rotated, thus performing coloring. The above structure enables the switching of the coloring state and expands the applicability of the device.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A double-layer, double-color melt extrusion coloring device, characterized in that: The assembly includes an installation block (1), a separation tube (2), and a hopper (3). The installation block (1) has a horizontally extending installation port (102), with one end being the inlet and the other the outlet. A first pigment hole (101) is vertically formed on the top surface of the installation block (1), and a second pigment hole (103) is horizontally formed on the vertical sidewall of the installation block (1). The first pigment hole (101) is located on the side of the second pigment hole (103) near the inlet. The first pigment hole (101) and the second pigment hole (103) are connected to the installation port (102). The separation tube (2) is inserted into the installation port (102). A coloring groove (21) is formed circumferentially on the outer wall of the separation tube (2), and several coloring grooves (21) are formed on the outer wall of the separation tube (2) and connected to the coloring grooves (21). The separation tube (2) has a first feeding hole (24) along its radial direction. One end of the first feeding hole (24) extends to the inner ring wall of the separation tube (2), and the other end is connected to the separation tube (23). A scribing groove (25) is provided on the outer wall of the separation tube (2) along its axial direction. A connecting arc groove (26) is provided on the outer ring wall of the separation tube (2) along its circumference. The connecting arc groove (26) is connected to one end of the scribing groove (25). The end of the scribing groove (25) away from the connecting arc groove (26) is connected to the second feeding hole (27). A plurality of second feeding holes (27) are provided on the separation tube (2) along its radial direction. One end of the second feeding hole (27) is flush with the inner ring wall of the separation tube (2), and the other end is connected to the connecting arc groove (26).

2. The double-layer, double-color melt extrusion coloring device according to claim 1, characterized in that: Two transmission grooves (22) are formed along the axial direction on the outer ring wall of the separation tube (2). One end of the transmission groove (22) is connected to the coloring groove (21). Two diversion grooves (23) are connected to the end of each transmission groove (22) away from the coloring groove (21). A first diversion plate (4) is provided on the inner wall of the coloring groove (21) along the axial direction of the separation tube (2). The position of the first diversion plate (4) corresponds to the first pigment hole (101).

3. The double-layer, double-color melt extrusion coloring device according to claim 2, characterized in that: A limiting ring (5) is connected to the outer ring wall of the separation tube (2). A matching threaded hole (7) is provided on the outer ring wall of the separation tube (2). A connecting threaded hole (6) is provided on the mounting block (1). In the working state, the matching threaded hole (7) and the connecting threaded hole (6) are connected. A connecting piece is provided in both the matching threaded hole (7) and the connecting threaded hole (6). The limiting ring (5) abuts against the outer wall of the mounting block (1).

4. The double-layer, double-color melt extrusion coloring device according to claim 3, characterized in that: The coloring groove (21) is arranged in a ring shape, and two sets of alignment threaded holes (7) are provided on the separation tube (2), with the two sets of alignment threaded holes (7) arranged at a 90° interval on the separation tube (2).

5. The double-layer, double-color melt extrusion coloring device according to claim 4, characterized in that: The inner bottom wall of the coloring tank (21) is provided with a receiving groove (28) for accommodating the first diverter plate (4). One side of the first diverter plate (4) is slidably disposed in the receiving groove (28). An elastic element is provided in the receiving groove (28). The elastic element is connected to the first diverter plate (4). In its natural state, the side of the first diverter plate (4) is flush with the outer ring wall of the separation tube (2) under the action of the elastic element. An adjusting groove (104) is provided on the inner wall of the mounting port (102). An abutting plate (10) is slidably disposed in the adjusting groove (104). The position of the abutting plate (10) corresponds to that of the coloring tank (21). The thickness of the abutting plate (10) is less than the width of the coloring tank (21). An adjusting element for adjusting the position of the abutting plate (10) is provided on the mounting block (1).

6. The double-layer, double-color melt extrusion coloring device according to claim 4, characterized in that: An insertion groove (13) is provided axially on the outer ring wall of the separating tube (2) at the end away from the limiting ring (5). A rotating groove (14) is provided circumferentially on the outer ring wall of the separating tube (2). The rotating groove (14) is set at 90°. One end of the rotating groove (14) is connected to the end of the insertion groove (13) away from the end of the separating tube (2). A guide block (12) is connected to the inner ring wall of the mounting port (102). The guide block (12) is connected to... The insertion slide (13) and the rotation slide (14) are slidably connected. When the guide block (12) is located at the end of the rotation slide (14) that is connected to the insertion slide (13), one set of the alignment threaded holes (7) corresponds to the position of the connecting threaded hole (6). When the guide block (12) is located at the end of the rotation slide (14) that is away from the insertion slide (13), the other set of the alignment threaded holes (7) corresponds to the position of the connecting threaded hole (6).

7. The double-layer, double-color melt extrusion coloring device according to claim 1, characterized in that: Two of the connecting arc grooves (26) are arranged parallel to each other on the separation tube (2). The scribing groove (25) is connected to both of the connecting arc grooves (26). The two second feeding holes (27) connected to the two connecting arc grooves (26) are arranged one-to-one along the axial direction of the separation tube (2). The two corresponding second feeding holes (27) are located on the same straight line along the axial direction on the inner ring wall of the separation tube (2).

8. The double-layer, double-color melt extrusion coloring device according to claim 7, characterized in that: A guide plate (15) is provided in the scribing groove (25) along its length direction, and the thickness of the guide plate (15) is less than the width of the scribing groove (25).

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