Three-layer co-extrusion die capable of inhibiting die orifice casting

Abstract

The invention relates to the technical field of glue injection molds, in particular to a three-layer co-extrusion mold capable of inhibiting mold orifice casting, which comprises a main body, a mold sleeve and a cleaning mechanism, the die sleeve is mounted on the main body, and a rotary driving assembly is arranged on the die sleeve; the cleaning mechanism comprises a mounting ring and an angle adjusting assembly; the mounting ring is rotationally arranged on the die sleeve; the rotary driving assembly is used for driving the mounting ring to rotate; a first rotating shaft and a second rotating shaft are rotationally arranged on the mounting ring, the first rotating shaft is connected with the mounting ring through a torsional spring, the first rotating shaft and the second rotating shaft are sleeved with a first scraping strip and a second scraping strip respectively, and the first rotating shaft is in transmission connection with the second rotating shaft through an angle adjusting assembly. The mold opening cleaning function is achieved, the mold opening size is increased, the mold opening pressure difference is reduced, and the mold release expansion effect is relieved. And the smooth finish of the edge of the die orifice is improved, so that the die orifice tape casting is difficult to retain. And waste accumulated on the working face of the die sleeve is cleaned through cooperation of the first scraping strip and the second scraping strip.

Description

Technical Field

[0001] The invention relates to the technical field of glue injection molds, in particular to a three-layer co-extrusion mold capable of suppressing die mouth flow casting. Background Art

[0002] Cable extrusion is the process of conveying, compacting, and melting plastic or other insulating or sheathing materials in the barrel through the rotation of the screw, and then extruding them through a mold of a specific shape to evenly coat the cable core or cable core. The three-layer co-extrusion mold has three independent and interrelated flow channels inside, corresponding to the extrusion paths of the inner shielding layer, the insulating layer, and the outer shielding layer. Due to the limited length of the feed channel in the mold, different layers of insulating materials may come into contact and fuse in advance, resulting in the inability to peel off in layers.

[0003] To this end, the Chinese patent with the authorization announcement number CN216914773U discloses a three-layer co-extrusion die for cable production, in which the extended part of one end of the large mold core extends obliquely to the wire receiving area, just forming a middle feed channel with the outer surface of the outer mold core that slowly closes to the wire receiving area, so that the discharge amount of the channel mouth can be accurately controlled. At the same time, the extended part of the large mold core also forms an outer feed channel with the mold sleeve, and the inner, middle and outer feed channels leading to the end of the wire receiving area are arranged in a front-to-back order, so that the insulating materials corresponding to the three feed channels are attached to the guide core in layers. In the feed channel, the insulating material is still being heated, and the active molecular movement of different levels of insulating materials in advance at a higher temperature will accelerate the fusion of the materials. However, because the feed channel directly transports the insulating material to the wire receiving area, it prevents the insulating materials of different levels from fusion before contacting the guide core, so that the different insulating layers of the cable can be peeled off from each other, which is convenient for the cable to perform various operations in actual use.

[0004] However, during the extrusion process, the molten insulating shielding material is extruded through the head die under high shear force. The melt shear rate near the contact position with the die is the largest, and the melt will flow intermittently. The components with low relative molecular weight in the shielding material are mostly concentrated near the contact position with the die. When it leaves the die sleeve, it accumulates at the edge of the die sleeve due to the die expansion effect, causing die mouth casting problems. Summary of the invention

[0005] In view of the above problems, a three-layer co-extrusion die capable of suppressing die mouth flow is provided. The die mouth flow problem caused by the die expansion effect during the extrusion process of the traditional three-layer co-extrusion die is solved through the main body, die sleeve and cleaning mechanism.

[0006] In order to solve the problems of the prior art, the present invention provides a three-layer co-extrusion die capable of suppressing die mouth flow casting, comprising a main body, a die sleeve and a cleaning mechanism; the die sleeve is installed on the main body, and a rotating drive assembly is provided on the die sleeve; the cleaning mechanism comprises a mounting ring and an angle adjustment assembly; the mounting ring is rotatably arranged on the die sleeve, and the rotating drive assembly is used to drive the mounting ring to rotate; a first rotating shaft and a second rotating shaft are rotatably arranged on the mounting ring, and the first rotating shaft is connected to the mounting ring through a torsion spring, a first scraper strip and a second scraper strip are respectively sleeved on the first rotating shaft and the second rotating shaft, and the first rotating shaft is transmission-connected to the second rotating shaft through the angle adjustment assembly.

[0007] Preferably, the angle adjustment assembly includes a first connecting block, a second connecting block, a slider, a first connecting rod and a second connecting rod; the first connecting block and the second connecting block are respectively connected to the first rotating shaft and the second rotating shaft; the slider is slidably mounted on the mounting ring, and the slider is provided with a fourth rotating shaft; the two ends of the first connecting rod are respectively hinged to the first connecting block and the fourth rotating shaft, and the two ends of the second connecting rod are respectively hinged to the second connecting block and the fourth rotating shaft.

[0008] Preferably, the damping assembly includes a first hinge seat, a second hinge seat and an elastic member; the first hinge seat is sleeved on the third rotating shaft; the second hinge seat is rotatably arranged on the mounting ring; and both ends of the elastic member are respectively connected to the first hinge seat and the second hinge seat.

[0009] Preferably, a cooling mechanism is provided on the mold sleeve, and the cooling mechanism includes an air cooling component and a transmission component; the air cooling component is arranged between the mold sleeve and the main body, and the air cooling component is transmission-connected to the mounting ring through the transmission component.

[0010] Preferably, the air-cooled mold comprises a first connecting ring, a fourth rotating shaft and a fan; the first connecting ring is arranged on the mold sleeve; the fourth rotating shaft is rotatably arranged on the first connecting ring, the fan is sleeved on the fourth rotating shaft, and the fourth rotating shaft is transmission-connected to the mounting ring through a transmission assembly.

[0011] Preferably, the transmission assembly includes a second connecting ring, a first gear ring and a first rotating gear; the second connecting ring is rotatably set on the mold sleeve, and the first rotating shaft and the second rotating shaft are both rotatably connected to the second connecting ring; the first gear ring is sleeved on the second connecting ring; the first rotating gear is sleeved on the fourth rotating shaft, and the first rotating gear is meshingly connected to the first gear ring.

[0012] Preferably, a water cooling pipe is provided on the inner surface of the mold sleeve.

[0013] Preferably, a conical die opening is provided at one end of the die sleeve away from the main body.

[0014] Preferably, a drainage groove is provided on the outer surface of the die opening.

[0015] Preferably, the rotary drive assembly includes a rotary driver, a transmission shaft, a second rotary gear and a second gear ring; the rotary driver is arranged on the mold sleeve; the transmission shaft is rotatably arranged on the mold sleeve, and the driving end of the rotary driver is transmission-connected to the transmission shaft; the second rotary gear is sleeved on the transmission shaft; the second gear ring is sleeved on the mounting ring, and the second rotary gear is meshingly connected to the second gear ring.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention realizes the function of cleaning the die opening through the main body, die sleeve and cleaning mechanism, and reduces the die opening pressure difference by increasing the die opening size and reducing the die opening expansion effect. The smoothness of the die opening edge is improved, so that the smoothness of the die opening edge and the smoothness of the working surface are consistent, so that the die opening casting is not easy to be retained there. And the waste accumulated on the working surface of the die sleeve is cleaned by the cooperation of the first scraper and the second scraper.

[0017] 2. The present invention realizes the function of controlling the rotation of the second rotating shaft when the first rotating shaft rotates through the first connecting block, the second connecting block, the slider, the first connecting rod and the second connecting rod. During the rotation of the mounting ring, when the first scraper is squeezed by the waste material and rotates, the first scraper drives the first rotating shaft and the first connecting block to rotate, the first connecting block pushes the slider to move through the first connecting rod, and the slider pulls the second connecting block through the second connecting rod when moving, the second connecting block rotates under the action of the pulling force, the second connecting block drives the second rotating shaft and the second scraper to rotate, and then the second scraper stands up, and the cleaning action is performed with the assistance of the second scraper.

[0018] 3. The present invention realizes the function of providing damping to the movement of the slider through the first hinge seat, the second hinge seat and the elastic member. When the torsion spring controls the reset of the first scraper and the second scraper, the slider slows down before reaching the critical position, and the slider speeds up when it exceeds the critical position, and then the second scraper performs a cleaning effect. It is prevented that the reset speed of the second scraper and the first scraper is too fast to affect the cleaning effect of the second scraper. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of a three-layer co-extrusion die capable of suppressing die mouth flow casting according to the present invention.

[0020] Figure 2 The present invention is a cross-sectional schematic diagram of a three-layer co-extrusion die capable of suppressing die mouth casting.

[0021] Figure 3 The invention discloses a stereoscopic schematic diagram of a rotary drive assembly, a cleaning mechanism and a cooling mechanism in a three-layer co-extrusion die capable of suppressing die mouth flow casting.

[0022] Figure 4The invention discloses a three-dimensional schematic diagram of a cleaning mechanism in a three-layer co-extrusion die capable of suppressing die mouth flow casting when the second scraper is in an unfolded state.

[0023] Figure 5 The invention discloses a three-dimensional schematic diagram of a cleaning mechanism in a three-layer co-extrusion die capable of suppressing die mouth flow casting when the first scraper is in an unfolded state.

[0024] Figure 6 The invention discloses a three-dimensional schematic diagram of a cleaning mechanism and a cooling mechanism in a three-layer co-extrusion die capable of suppressing die mouth flow casting.

[0025] Figure 7 The invention discloses a three-dimensional schematic diagram of a cleaning mechanism, an air cooling component and a transmission component in a three-layer co-extrusion die capable of suppressing die mouth flow casting.

[0026] Figure 8 The present invention Figure 7 A local enlarged schematic diagram of point A in the middle.

[0027] Fig. 9 The invention discloses a cross-sectional schematic diagram of the cooperation between a cleaning mechanism and a wire core in a three-layer co-extrusion die capable of suppressing die mouth flow casting.

[0028] Fig.10 The present invention is a stereoscopic schematic diagram of a die opening of a three-layer co-extrusion die capable of suppressing die opening casting.

[0029] The numbers in the figure are: 1, main body; 2, die sleeve; 21, rotation drive assembly; 211, rotation driver; 212, transmission shaft; 213, second rotation gear; 214, second gear ring; 215, pulley; 216, transmission belt; 22, die mouth; 221, drainage groove; 3, cleaning mechanism; 31, mounting ring; 311, first rotating shaft; 312, first scraper; 313, second rotating shaft; 314, second scraper; 32, angle adjustment assembly; 321, first connecting block; 322, The second connecting block; 323, the slider; 3231, the third rotating shaft; 324, the first connecting rod; 325, the second connecting rod; 33, the damping assembly; 331, the first hinge seat; 332, the second hinge seat; 333, the elastic member; 4, the cooling mechanism; 41, the air cooling assembly; 411, the first connecting ring; 412, the fourth rotating shaft; 413, the fan; 42, the transmission assembly; 421, the second connecting ring; 422, the first gear ring; 423, the first rotating gear; 43, the water cooling pipe; 5, the wire core. DETAILED DESCRIPTION

[0030] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Reference Figure 1-Figure 5 : A three-layer co-extrusion die capable of suppressing die mouth flow casting, comprising a main body 1, a die sleeve 2 and a cleaning mechanism 3; the die sleeve 2 is mounted on the main body 1, and a rotating drive assembly 21 is provided on the die sleeve 2; the cleaning mechanism 3 comprises a mounting ring 31 and an angle adjustment assembly 32; the mounting ring 31 is rotatably arranged on the die sleeve 2, and the rotating drive assembly 21 is used to drive the mounting ring 31 to rotate; a first rotating shaft 311 and a second rotating shaft 313 are rotatably arranged on the mounting ring 31, and the first rotating shaft 311 is connected to the mounting ring 31 through a torsion spring, a first scraper 312 and a second scraper 314 are respectively sleeved on the first rotating shaft 311 and the second rotating shaft 313, and the first rotating shaft 311 is transmission-connected to the second rotating shaft 313 through the angle adjustment assembly 32.

[0032] The finish grade of the working surface of the mold sleeve 2 is Ra0.05, and the size of the mold opening 22 of the mold sleeve 2 is the outer diameter of the insulating core 5 + 1mm to 2mm. The first scraper 312 is preferably made of polytetrafluoroethylene PTFE material, which has moderate hardness and can meet the requirements of scraping general insulating shielding materials without causing damage to the mold. At the same time, it also has good toughness and can maintain a stable shape during a long period of scraping. The second scraper 314 is preferably made of alumina ceramic material, which has a higher hardness than polytetrafluoroethylene PTFE material and can clean up some tightly adhered accumulations that the first scraper 312 cannot clean up. The surface of the alumina ceramic is smooth and will not cause excessive damage to the mold opening 22.

[0033] The present invention realizes the function of cleaning the die opening 22 through the main body 1, the die sleeve 2 and the cleaning mechanism 3, and reduces the mold expansion effect by increasing the size of the die opening 22 and reducing the pressure difference of the die opening 22. The smoothness of the edge of the die opening 22 is improved so that the smoothness of the edge of the die opening 22 and the smoothness of the working surface are consistent, so that the die opening casting is not easy to be retained here. And the waste accumulated on the working surface of the die sleeve 2 is cleaned by the cooperation of the first scraper 312 and the second scraper 314. In the working state, the rotary drive component 21 drives the mounting ring 31 to rotate, and the mounting ring 31 drives the first scraper 312 and the second scraper 314 to rotate. During the rotation process, the cleaning action is performed by the first scraper 312. When encountering some waste materials that are relatively tightly adhered, the first scraper 312 cannot clean it up. When the first scraper 312 is squeezed after contacting with the waste, the torsion spring rotates under the action of torque, and the first scraper 312 rotates around the axis of the first rotating shaft 311. After the first rotating shaft 311 rotates, the second rotating shaft 313 is driven to rotate by the transmission action of the angle adjustment component 32, and the second rotating shaft 313 drives the second scraper 314 to rotate, and then the waste is cleaned by the second scraper 314. When the first scraper 312 is in the unfolded state, the first scraper 312 extends along the radial direction of the mounting ring 31, and the first scraper 312 is driven to rotate by the rotation of the mounting ring 31 to perform the cleaning action. At this time, the second scraper 314 is in the folded state. When the first scraper 312 is blocked, it rotates and changes to the folded state. At this time, the first rotating shaft 311 drives the second rotating shaft 313 to rotate through the angle adjustment component 32, and the second rotating shaft 313 drives the second scraper 314 to rotate, so that the second scraper 314 rotates to the unfolded state, and the second scraper 314 is used to clean. When the first scraper 312 can complete the cleaning action, there is no need to use the second scraper 314 with higher hardness for cleaning, which can protect the mold sleeve 2 to the greatest extent. When the first scraper 312 cannot complete the cleaning action, the second scraper 314 with higher hardness is used for cleaning to ensure the cleaning quality.

[0034] Reference Figure 2-Figure 5 : The angle adjustment component 32 includes a first connecting block 321, a second connecting block 322, a slider 323, a first connecting rod 324 and a second connecting rod 325; the first connecting block 321 and the second connecting block 322 are respectively connected to the first rotating shaft 311 and the second rotating shaft 313; the slider 323 is slidably installed on the mounting ring 31, and the slider 323 is provided with a fourth rotating shaft 412; the two ends of the first connecting rod 324 are respectively hinged to the first connecting block 321 and the fourth rotating shaft 412, and the two ends of the second connecting rod 325 are respectively hinged to the second connecting block 322 and the fourth rotating shaft 412.

[0035] The present invention realizes the function of controlling the rotation of the second rotating shaft 313 when the first rotating shaft 311 rotates through the first connecting block 321, the second connecting block 322, the slider 323, the first connecting rod 324 and the second connecting rod 325. The first connecting block 321 and the second connecting block 322 are both provided with fixed shafts, the axis of the fixed shaft on the first connecting block 321 deviates from the axis of the first rotating shaft 311, the axis of the fixed shaft on the second connecting block 322 deviates from the axis of the second rotating shaft 313, and the first connecting rod 324 and the second connecting rod 325 are respectively hinged to the first connecting block 321 and the second connecting block 322 through the fixed shaft. During the rotation of the mounting ring 31, when the first scraper 312 is rotated due to the squeezing effect of the waste, the first scraper 312 drives the first rotating shaft 311 and the first connecting block 321 to rotate, and the first connecting block 321 pushes the slider 323 to move through the first connecting rod 324, and the slider 323 pulls the second connecting block 322 through the second connecting rod 325 when moving. The second connecting block 322 rotates under the action of the pulling force, and the second connecting block 322 drives the second rotating shaft 313 and the second scraper 314 to rotate, thereby making the second scraper 314 stand up, and the cleaning action is performed with the assistance of the second scraper 314.

[0036] Reference Figure 3 and Figure 4 : The damping assembly 33 includes a first hinge seat 331, a second hinge seat 332 and an elastic member 333; the first hinge seat 331 is sleeved on the third rotating shaft 3231; the second hinge seat 332 is rotatably set on the mounting ring 31; the two ends of the elastic member 333 are respectively connected to the first hinge seat 331 and the second hinge seat 332.

[0037] The present invention realizes the function of providing damping to the movement of the slider 323 through the first hinge seat 331, the second hinge seat 332 and the elastic member 333. When the first scraper 312 is deflected by the extrusion, the first rotating shaft 311 drives the first connecting block 321 to rotate, and the thrust transmitted by the first connecting rod 324 pushes the slider 323 to move. When the slider 323 approaches the second hinge seat 332, the elastic member 333 contracts under the pressure until the second connecting rod 325 and the elastic member 333 are in a straight line, the compression of the elastic member 333 is the largest, and the slider 323 is in a critical position. When the deflection of the first scraper 312 is small, so that the position of the slider 323 does not exceed the above critical position, the damping assembly 33 provides resistance to the movement of the slider 323, thereby preventing the first scraper 312 from further rotating, so that the first scraper 312 can be quickly reset under the elastic force of the torsion spring and the elastic member 333 when it is no longer extruded. When the deflection of the first scraper 312 is large, so that the position of the slider 323 exceeds the above critical position, the elastic member 333 stretches, so that the direction of the elastic force provided by the elastic member 333 is deflected, and the direction of the pressure on the slider 323 is also deflected, providing additional support for the deployment of the second scraper 314. When the torsion spring controls the first scraper 312 and the second scraper 314 to reset, the slider 323 moves slower before reaching the critical position, and the slider 323 moves faster when it exceeds the critical position, and then the second scraper 314 performs a cleaning effect. Avoid the second scraper 314 and the first scraper 312 reset too fast to affect the cleaning effect of the second scraper 314.

[0038] Reference Figure 1-Figure 3 : A cooling mechanism 4 is provided on the mold sleeve 2, and the cooling mechanism 4 includes an air cooling component 41 and a transmission component 42; the air cooling component 41 is arranged between the mold sleeve 2 and the main body 1, and the air cooling component 41 is transmission-connected to the mounting ring 31 through the transmission component 42.

[0039] The present invention realizes the function of accelerating the cooling of the wire core 5 through the air cooling component 41 and the transmission component 42, and can reduce the temperature of the material near the die opening 22. For the insulating shielding material in the molten state, the temperature reduction will increase its viscosity. Higher viscosity can reduce the fluidity of the material, thereby inhibiting the accumulation at the edge of the die sleeve 2 caused by the mold expansion effect. Through proper cooling, the fluidity of the material when leaving the die opening 22 can be reduced, thereby reducing the die opening casting. In particular, for some materials that are prone to casting problems or at higher extrusion speeds, the effect of the cooling ring may be more obvious. Reducing the die opening casting helps to improve the appearance quality of the product and make the cable surface smoother and more uniform. When the rotating drive component 21 drives the mounting ring 31 to rotate, the mounting ring 31 transmits torque through the transmission component 42 to drive the air cooling component 41, and the air cooling component 41 forms an airflow flowing from the main body 1 toward the die opening 22 of the die sleeve 2, and the heat is taken away by the airflow to achieve the cooling effect.

[0040] Reference Figure 2 , Figure 3 , Figure 7 and Figure 8 The air-cooled mold comprises a first connecting ring 411, a fourth rotating shaft 412 and a fan 413; the first connecting ring 411 is arranged on the mold sleeve 2; the fourth rotating shaft 412 is rotatably arranged on the first connecting ring 411, the fan 413 is sleeved on the fourth rotating shaft 412, and the fourth rotating shaft 412 is transmission-connected to the mounting ring 31 through a transmission assembly 42.

[0041] The present invention realizes the function of generating airflow when the mounting ring 31 rotates through the first connecting ring 411, the fourth rotating shaft 412 and the fan 413, thereby achieving the effect of cooling the material at the die opening 22. When the mounting ring 31 rotates, the torque transmitted by the transmission assembly 42 drives the fourth rotating shaft 412 to rotate, and the fourth rotating shaft 412 drives the fan 413 to rotate, thereby generating airflow, and the heat on the surface of the material is taken away by the airflow. At the same time, the waste scraped by the first scraping strip 312 and the second scraping strip 314 can be blown out of the die opening 22 through the airflow, so as to prevent the scraped waste from adhering to the die opening 22 or the surface of the wire core 5 again.

[0042] Reference Figure 2 , Figure 7 and Figure 8 : The transmission assembly 42 includes a second connecting ring 421, a first gear ring 422 and a first rotating gear 423; the second connecting ring 421 is rotatably set on the mold sleeve 2, and the first rotating shaft 311 and the second rotating shaft 313 are both rotatably connected to the second connecting ring 421; the first gear ring 422 is sleeved on the second connecting ring 421; the first rotating gear 423 is sleeved on the fourth rotating shaft 412, and the first rotating gear 423 is meshingly connected with the first gear ring 422.

[0043] The present invention realizes the function of driving the fourth rotating shaft 412 to rotate when the mounting ring 31 rotates through the second connecting ring 421, the first gear ring 422 and the first rotating gear 423. When the mounting ring 31 rotates, the first rotating shaft 311 and the second rotating shaft 313 are driven to rotate around the axis of the mounting ring 31, and the second connecting ring 421 is driven to rotate by the first rotating shaft 311 and the second rotating shaft 313, the second connecting ring 421 drives the first gear ring 422 to rotate, the first gear ring 422 drives the first rotating gear 423 meshed with it to rotate, and the first rotating gear 423 drives the fourth rotating shaft 412 and the fan 413 to rotate. When the fan 413 rotates, airflow is generated to achieve cooling and cleaning effects.

[0044] Reference Figure 2 , Figure 5 and Figure 6 : A water cooling pipe 43 is provided on the inner surface of the mold sleeve 2.

[0045] The present invention realizes the function of controlling the cooling efficiency through the water cooling pipe 43. The water cooling pipe 43 is provided with a water inlet pipe and a water outlet pipe, and water is circulated through the pipe in the water cooling pipe 43. When cooling is performed through the cooling mechanism 4, the cooling temperature needs to be accurately controlled. If the temperature is too low, the material may be over-solidified at the die opening 22, resulting in clogging of the die opening 22 and affecting the continuity of extrusion. Moreover, different insulating shielding materials have different optimal cooling temperature ranges. For this reason, a water cooling pipe 43 is provided to control the overall cooling range. When using different insulating shielding materials, the water temperature of the circulating water in the water cooling pipe 43 is adjusted, and then the overall temperature at the die opening 22 is adjusted, and the airflow provided by the air cooling component 41 is coordinated to improve the cooling uniformity.

[0046] Reference Figure 1 and Fig.10 : A conical die opening 22 is provided at one end of the die sleeve 2 away from the main body 1.

[0047] The present invention achieves the function of reducing the area of ​​the edge of the die opening 22 by setting the die opening 22 of the die sleeve 2 to be conical, so that the contact area between the die opening casting and the die opening 22 is reduced, so that too much stagnation at the die opening 22 is prevented. The edge size of the die opening 22 is preferably 2 mm. Due to the difference in shielding material manufacturers and batches, die opening casting is difficult to avoid. By designing the shape of the die opening 22 in this way, the die opening casting is guided, so that the generated casting does not accumulate at the edge of the die opening 22, and the die opening casting is effectively prevented from adhering to the surface of the wire core 5.

[0048] Reference Fig.10 A drainage groove 221 is provided on the outer surface of the die opening 22.

[0049] The present invention realizes the function of guiding the die casting flow through the drainage groove 221. During the working process, the generated die casting flows along the edge of the die 22 into the drainage groove 221, and is dredged to the outer edge of the die sleeve 2 through the drainage groove 221, and does not accumulate near the die 22, thereby avoiding affecting the surface quality of the insulation.

[0050] Reference Figure 1-Figure 3 : The rotary drive assembly 21 includes a rotary driver 211, a transmission shaft 212, a second rotary gear 213 and a second gear ring 214; the rotary driver 211 is arranged on the mold sleeve 2; the transmission shaft 212 is rotatably arranged on the mold sleeve 2, and the driving end of the rotary driver 211 is transmission-connected with the transmission shaft 212; the second rotary gear 213 is sleeved on the transmission shaft 212; the second gear ring 214 is sleeved on the mounting ring 31, and the second rotary gear 213 is meshingly connected with the second gear ring 214.

[0051] The present invention realizes the function of driving the installation ring 31 to rotate through the rotary driver 211, the transmission shaft 212, the second rotary gear 213 and the second gear ring 214. A pulley 215 is sleeved on the driving end of the rotary driver 211 and the transmission shaft 212, and a transmission belt 216 is sleeved on the pulley 215. The two pulleys 215 are connected by the transmission belt 216. In the working state, the operator starts the rotary driver 211, and the rotary driver 211 drives the transmission shaft 212 to rotate through the pulley 215 and the transmission belt 216. The transmission shaft 212 drives the second rotary gear 213 to rotate, and the second rotary gear 213 drives the second gear ring 214 meshed with it to rotate, and the second gear ring 214 drives the installation ring 31 to rotate. The installation ring 31 drives the first scraper 312 and the second scraper 314 to rotate to perform a cleaning action.

[0052] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A three-layer co-extrusion die capable of suppressing die casting, characterized in that: It comprises a main body (1), a mold sleeve (2) and a cleaning mechanism (3); The mold sleeve (2) is mounted on the main body (1), and a rotation drive assembly (21) is provided on the mold sleeve (2); The cleaning mechanism (3) comprises a mounting ring (31) and an angle adjustment assembly (32); The mounting ring (31) is rotatably mounted on the mold sleeve (2), and the rotary drive assembly (21) is used to drive the mounting ring (31) to rotate; A first rotating shaft (311) and a second rotating shaft (313) are rotatably arranged on the mounting ring (31), and the first rotating shaft (311) is connected to the mounting ring (31) via a torsion spring. A first scraper strip (312) and a second scraper strip (314) are sleeved on the first rotating shaft (311) and the second rotating shaft (313), respectively. The first rotating shaft (311) is transmission-connected to the second rotating shaft (313) via an angle adjustment assembly (32).

2. A three-layer co-extrusion die capable of suppressing die casting according to claim 1, characterized in that: The angle adjustment assembly (32) comprises a first connecting block (321), a second connecting block (322), a sliding block (323), a first connecting rod (324) and a second connecting rod (325); The first connecting block (321) and the second connecting block (322) are respectively connected to the first rotating shaft (311) and the second rotating shaft (313); The slider (323) is slidably mounted on the mounting ring (31), and a fourth rotating shaft (412) is provided on the slider (323); The two ends of the first connecting rod (324) are respectively hinged to the first connecting block (321) and the fourth rotating shaft (412), and the two ends of the second connecting rod (325) are respectively hinged to the second connecting block (322) and the fourth rotating shaft (412).

3. A three-layer co-extrusion die capable of suppressing die casting according to claim 2, characterized in that: The damping assembly (33) comprises a first hinge seat (331), a second hinge seat (332) and an elastic member (333); The first hinge seat (331) is sleeved on the third rotating shaft (3231); The second hinge seat (332) is rotatably disposed on the mounting ring (31); Two ends of the elastic member (333) are respectively connected to the first hinge seat (331) and the second hinge seat (332).

4. A three-layer co-extrusion die capable of suppressing die casting according to claim 1, characterized in that: A cooling mechanism (4) is provided on the mold sleeve (2), and the cooling mechanism (4) comprises an air cooling component (41) and a transmission component (42); The air cooling component (41) is arranged between the mold sleeve (2) and the main body (1), and the air cooling component (41) is transmission-connected to the mounting ring (31) via the transmission component (42).

5. A three-layer co-extrusion die capable of suppressing die casting according to claim 4, characterized in that: The air-cooling device comprises a first connecting ring (411), a fourth rotating shaft (412) and a fan (413); The first connecting ring (411) is arranged on the mold sleeve (2); The fourth rotating shaft (412) is rotatably disposed on the first connecting ring (411), the fan (413) is sleeved on the fourth rotating shaft (412), and the fourth rotating shaft (412) is transmission-connected to the mounting ring (31) via a transmission assembly (42).

6. A three-layer co-extrusion die capable of suppressing die casting according to claim 5, characterized in that: The transmission assembly (42) comprises a second connecting ring (421), a first gear ring (422) and a first rotating gear (423); The second connecting ring (421) is rotatably disposed on the mold sleeve (2), and the first rotating shaft (311) and the second rotating shaft (313) are both rotatably connected to the second connecting ring (421); The first gear ring (422) is sleeved on the second connecting ring (421); The first rotating gear (423) is sleeved on the fourth rotating shaft (412), and the first rotating gear (423) is meshingly connected with the first gear ring (422).

7. A three-layer co-extrusion die capable of suppressing die casting according to claim 4, characterized in that: The inner surface of the mold sleeve (2) is provided with a water cooling pipe (43).

8. A three-layer co-extrusion die capable of suppressing die casting according to claim 1, characterized in that: A conical die opening (22) is provided at one end of the die sleeve (2) away from the main body (1).

9. A three-layer co-extrusion die capable of suppressing die casting according to claim 8, characterized in that: A drainage groove (221) is provided on the outer surface of the die opening (22).

10. A three-layer co-extrusion die capable of suppressing die casting according to claim 1, characterized in that: The rotary drive assembly (21) comprises a rotary drive (211), a transmission shaft (212), a second rotary gear (213) and a second gear ring (214); The rotary driver (211) is arranged on the mold sleeve (2); The transmission shaft (212) is rotatably disposed on the mold sleeve (2), and the driving end of the rotary driver (211) is in transmission connection with the transmission shaft (212); The second rotating gear (213) is sleeved on the transmission shaft (212); The second gear ring (214) is sleeved on the mounting ring (31), and the second rotating gear (213) is meshingly connected with the second gear ring (214).

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