A rod extrusion device

Abstract

The utility model provides a kind of bar extrusion device, bar extrusion device includes first extruder, main pipe, discharge pipe, first joint, second extruder, auxiliary pipe, second joint and shunt cover, first extruder is equipped with main pipe, main pipe is equipped with total passage to be formed into mandrel with total material entering, discharge pipe is equipped with discharge passage, first joint connects main pipe with two discharge pipes, second extruder is equipped with auxiliary pipe, auxiliary pipe is equipped with auxiliary passage to be entered with auxiliary material, second joint connects auxiliary pipe with two discharge pipes, and second joint is arranged with first joint interval, second joint is equipped with two installation cavities, each shunt cover is arranged in installation cavity, shunt cover is equipped with branch passage to be communicated with discharge passage, the outer circumferential surface of shunt cover and the inner circumferential surface of installation cavity define flow channel, flow channel connects auxiliary passage and discharge passage, flow channel is used to make auxiliary material in discharge passage and mandrel confluence, and adhere to the outside of mandrel to form bar material.

Description

Technical Field

[0001] This utility model relates to the field of co-extrusion equipment technology, and in particular to a bar extrusion device. Background Technology

[0002] Co-extrusion technology is widely used in the extrusion molding process of composite materials, especially in the manufacture of two-layer products with a mandrel structure and an outer coating material (such as wires and cables, composite pipes, etc.). This technology uses multiple extruders to feed materials of different materials to achieve integrated molding of the core material and the coating layer, which has the advantages of high production efficiency and excellent structural performance.

[0003] However, in existing technologies, most co-extrusion equipment uses a single-channel extrusion structure, which can only achieve continuous extrusion of a single product. While this structure meets the basic requirements of composite molding to some extent, the equipment's capacity per unit time is low, making it difficult to meet the needs of large-scale continuous industrial production. Utility Model Content

[0004] This invention provides a bar extrusion device to address the low production efficiency of existing co-extrusion equipment.

[0005] This utility model provides a rod extrusion device, comprising: The first extruder is equipped with a main pipe, and the main pipe has a main channel to allow the material to enter and form a mandrel; Two discharge pipes are arranged side by side and spaced apart, and each discharge pipe is provided with a discharge channel. The first connector connects the main pipe to the two discharge pipes; The second extruder is equipped with an auxiliary pipe, and the auxiliary pipe has an auxiliary channel to allow auxiliary materials to enter. The second connector connects the auxiliary pipe to the two discharge pipes, and the second connector is arranged at an interval from the first connector. The second connector has two mounting cavities. Two diversion sleeves are provided, each of which is located within the mounting cavity. Each diversion sleeve has a branch channel for communicating with the discharge channel. The outer circumferential surface of the diversion sleeve and the inner circumferential surface of the mounting cavity define a guide channel. The guide channel connects the auxiliary channel and the discharge channel. The guide channel is used to allow the auxiliary material to converge with the mandrel in the discharge channel and adhere to the outside of the mandrel to form a rod.

[0006] In some embodiments, the outer peripheral surface of the diversion sleeve and the inner peripheral surface of the mounting cavity are both tapered surfaces. The outer peripheral side of the diversion sleeve is provided with a spiral protrusion to define a spiral groove. The spiral groove and the inner wall surface of the mounting cavity define the flow guiding channel.

[0007] In some embodiments, the diversion sleeve includes a limiting part and a sleeve body, the spiral groove is provided on the sleeve body, the second connector is provided with an installation groove, and the limiting part cooperates with the installation groove.

[0008] In some embodiments, the discharge pipe is provided with a residence chamber, which is connected to the mounting chamber, and the inner diameter of the residence chamber gradually decreases along the flow direction of the mandrel.

[0009] In some embodiments, the first connector includes a first inlet and two first outlets, the first inlet being connected to the main pipe, and the two first outlets being connected to the two discharge pipes in a one-to-one correspondence.

[0010] In some embodiments, the second connector includes a second inlet and two second outlets, the second inlet being connected to the auxiliary pipe, and the two second outlets being connected to the two flow channels in a one-to-one correspondence.

[0011] In some embodiments, the bar extrusion apparatus includes a guide head, one end of which is connected to the auxiliary pipe and the other end of which is connected to the second inlet. The guide head has a guide cavity inside, and the inner diameter of the guide cavity gradually decreases along the flow direction of the auxiliary material.

[0012] In some embodiments, the discharge pipe includes a first sub-pipe and a second sub-pipe, the first sub-pipe being disposed between the first connector and the second connector, and the second sub-pipe being disposed on the side of the second connector opposite to the first connector.

[0013] In some embodiments, the second connector includes a body and two connecting plates, both of which are detachably connected to the body, and the two connecting plates are connected to the two second sub-tubes in a one-to-one correspondence.

[0014] In some embodiments, the second sub-tube includes a stepped portion, and both connecting plates are provided with stepped holes, the stepped portion cooperating with the stepped holes.

[0015] The rod extrusion device of this utility model uses a first extruder and a second extruder to respectively transport mandrel material and coating auxiliary material, and employs independent main channels, auxiliary channels, and discharge channels to achieve orderly material flow, ensuring that the two materials do not interfere with each other before entering the molding area, thereby effectively improving the stability and controllability of the composite material molding process. Secondly, by setting a flow divider sleeve inside the second joint, with a branch channel inside the flow divider sleeve for the mandrel to pass through, a guide channel is formed between its outer circumference and the mounting cavity, allowing the auxiliary material to flow evenly into the discharge channel along a ring distribution. This achieves uniform coating of the mandrel by the auxiliary material, avoiding defects such as eccentricity and delamination common in traditional processes, and significantly improving the molding quality and consistency of the product.

[0016] Moreover, the bar extrusion device of this utility model uses the first connector and the second connector to divert the core rod and auxiliary material respectively, and the two discharge pipes arranged side by side can complete the extrusion of two bars at the same time in a single operation, which greatly improves production efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the bar extrusion device provided by this utility model.

[0019] Figure 2 This is a schematic diagram of the bar extrusion device provided by this utility model from another perspective.

[0020] Figure 3 This is a cross-sectional schematic diagram of the main pipe and discharge pipe of the bar extrusion device provided by this utility model.

[0021] Figure 4 This is a cross-sectional schematic diagram of the discharge pipe and the second joint of the bar extrusion device provided by this utility model.

[0022] Figure 5 This is a cross-sectional schematic diagram of the auxiliary pipe and second joint of the bar extrusion device provided by this utility model.

[0023] Figure 6 This is a schematic diagram of the structure of the diversion sleeve of the bar extrusion device provided by this utility model.

[0024] Figure 7 This is a schematic diagram of the structure of the second tube of the bar extrusion device provided by this utility model.

[0025] Figure 8 This is a schematic diagram of the structure of the second connector of the bar extrusion device provided by this utility model.

[0026] Figure label: 100. Bar extrusion equipment; 1. Main manager; 11. Main access route; 2. Discharge pipe; 21. Discharge channel; 22. Residence chamber; 23. First sub-pipe; 24. Second sub-pipe; 241. Stepped section; 3. First connector; 31. First inlet; 32. First outlet; 4. Auxiliary pipes; 41. Auxiliary channels; 5. Second connector; 51. Mounting cavity; 52. Second inlet; 53. Second outlet; 54. Body; 55. Connecting plate; 6. Diverter sleeve; 61. Diverter channel; 62. Guide channel; 63. Spiral protrusion; 64. Spiral groove; 65. Limiting part; 66. Sleeve body; 7. Guide head; 71. Guide cavity. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] like Figures 1 to 8 As shown, the bar extrusion device 100 of this utility model embodiment includes a first extruder, a main pipe 1, a discharge pipe 2, a first connector 3, a second extruder, an auxiliary pipe 4, a second connector 5, and a flow divider sleeve 6.

[0029] The first extruder is provided with a main pipe 1, and a main channel 11 is provided in the main pipe 1 so that the material can enter to form a mandrel.

[0030] Two discharge pipes 2 are arranged side by side and spaced apart, and discharge channels 21 are provided inside the discharge pipes 2.

[0031] The first connector 3 connects the main pipe 1 to the two discharge pipes 2.

[0032] The second extruder is equipped with an auxiliary pipe 4, and an auxiliary channel 41 is provided inside the auxiliary pipe 4 to allow auxiliary materials to enter.

[0033] The second connector 5 connects the auxiliary pipe 4 to the two discharge pipes 2, and the second connector 5 is arranged at intervals from the first connector 3. The second connector 5 is provided with two installation cavities 51.

[0034] Each diversion sleeve 6 is located inside the mounting cavity 51. The diversion sleeve 6 has a diversion channel 61 to communicate with the discharge channel 21. The outer peripheral surface of the diversion sleeve 6 and the inner peripheral surface of the mounting cavity 51 define a guide channel 62. The guide channel 62 connects the auxiliary channel 41 and the discharge channel 21. The guide channel 62 is used to allow the auxiliary material to converge with the mandrel in the discharge channel 21 and adhere to the outside of the mandrel to form a rod.

[0035] When the bar extrusion device 100 of this utility model is working, the first extruder starts to run and conveys the total material used to form the mandrel through the main channel 11 in the main pipe 1. Then the material is diverted through the first connector 3 to two parallel discharge pipes 2 and flows stably in the discharge channel 21 of each discharge pipe 2.

[0036] At the same time, the second extruder starts and transports the excipients for coating through the auxiliary channel 41 in the auxiliary pipe 4 to the second connector 5. Since the second connector 5 is arranged at intervals with the first connector 3, structural interference is avoided. The excipients are distributed in the two mounting cavities 51 inside the second connector 5.

[0037] Each mounting cavity 51 is provided with a diversion sleeve 6. The auxiliary material flows in the guide channel 62 formed between the outer peripheral surface of the diversion sleeve 6 and the inner peripheral surface of the mounting cavity 51, and finally enters the discharge channel 21.

[0038] The mandrel material continues to be conveyed forward through the branch channel 61 inside the diversion sleeve 6. Inside the discharge channel 21, the mandrel merges with the auxiliary material flowing in from the guide channel 62, and the auxiliary material evenly wraps around the outside of the mandrel, thus forming a rod with a double-layer structure.

[0039] Throughout the process, the design of the diversion sleeve 6 enables spatial isolation and precise delivery of the mandrel and auxiliary materials, ensuring the quality and consistency of the composite molding.

[0040] The rod extrusion device 100 of this utility model embodiment uses a first extruder and a second extruder to respectively transport mandrel material and coating auxiliary material, and adopts independent main channel 11, auxiliary channel 41 and discharge channel 21 to achieve orderly flow of materials, ensuring that the two materials do not interfere with each other before entering the molding area, thereby effectively improving the stability and controllability of the composite material molding process. Secondly, by setting a diversion sleeve 6 in the second connector 5, the diversion sleeve 6 has a diversion channel 61 for the mandrel to pass through, and its outer peripheral surface forms a guide channel 62 with the mounting cavity 51, so that the auxiliary material can flow into the discharge channel 21 evenly along the annular distribution, thereby achieving uniform coating of the mandrel by the auxiliary material, avoiding defects such as eccentricity and discontinuity common in traditional processes, and significantly improving the molding quality and consistency of the product.

[0041] Moreover, the bar extrusion device 100 of this utility model uses the first connector 3 and the second connector 5 to divert the core rod and auxiliary material respectively, and the two discharge pipes 2 arranged side by side can complete the extrusion of two bars in a single operation, which greatly improves production efficiency.

[0042] In some embodiments, the outer peripheral surface of the diversion sleeve 6 and the inner peripheral surface of the mounting cavity 51 are both tapered surfaces. The outer peripheral side of the diversion sleeve 6 is provided with a spiral protrusion 63 to define a spiral groove 64. The spiral groove 64 and the inner wall surface of the mounting cavity 51 define a flow guiding channel 62.

[0043] To further optimize the uniformity of flow and coating effect of the auxiliary material in the guide channel 62, the outer peripheral surface of the diversion sleeve 6 and the inner peripheral surface of the mounting cavity 51 are both designed as conical surfaces, so that a gradual annular space can be formed between the two, thereby guiding the auxiliary material to flow more smoothly and evenly to the discharge channel 21.

[0044] Meanwhile, a spiral protrusion 63 is provided on the outer periphery of the diversion sleeve 6. The spiral protrusion 63 cooperates with the inner wall of the mounting cavity 51 to define a spirally extending guide channel 62. This spiral groove 64 structure not only increases the flow path length of the auxiliary material, but also makes the auxiliary material generate a certain swirling effect during the flow process, which helps to improve its flow uniformity and filling density, thereby further improving the coating quality of the auxiliary material on the mandrel, ensuring that the outer layer thickness of the mandrel is consistent and the surface is smooth, effectively avoiding problems such as coating eccentricity or local material shortage caused by uneven flow, and enhancing the overall structural stability and molding effect of the product.

[0045] In some embodiments, the diversion sleeve 6 includes a limiting part 65 and a sleeve body 66, a spiral groove 64 is provided on the sleeve body 66, and a mounting groove is provided on the second connector 5, with the limiting part 65 cooperating with the mounting groove.

[0046] The spiral groove 64 is provided on the outer periphery of the sleeve 66 and is used to cooperate with the inner wall surface of the mounting cavity 51 to form a spiral guide channel 62 to guide the auxiliary material to flow evenly and cover the outside of the mandrel.

[0047] The limiting part 65 is located at one end of the sleeve 66 and is used to position and install the diverter sleeve 6 on the second connector 5. Specifically, the second connector 5 is provided with an installation groove that matches the limiting part 65. When the diverter sleeve 6 is inserted into the installation cavity 51, the limiting part 65 is embedded in the installation groove, thereby effectively preventing the diverter sleeve 6 from axially moving or rotating during operation, ensuring its structural stability and guiding accuracy under high temperature and high pressure extrusion environment. This structural design not only improves the firmness and positioning accuracy of the diverter sleeve 6 installation, but also facilitates disassembly and replacement, and allows for flexible adjustment of the diverter sleeve 6 model according to different product specifications, further improving the applicability and maintenance convenience of the equipment.

[0048] In some embodiments, the discharge pipe 2 is provided with a dwelling cavity 22, which is connected to the mounting cavity 51, and the inner diameter of the dwelling cavity 22 gradually decreases along the flow direction of the mandrel.

[0049] On the one hand, the dwell cavity 22 is set on the flow path of the mandrel and is connected to the mounting cavity 51, providing a buffer space for the auxiliary material before it enters the discharge channel 21, making its flow rate, pressure and distribution more uniform; on the other hand, the dwell cavity 22 also provides a smooth transition area for the mandrel and auxiliary material to merge, so that the mandrel is fully combined with the auxiliary material before entering the molding section. Moreover, the inner diameter of the dwell cavity 22 gradually decreases along the flow direction, forming a convergent structure, which helps to guide the auxiliary material to better adhere to the surface of the mandrel, enhance the coating density, and further improve the molding quality and structural stability.

[0050] The bar extrusion device 100 of this utility model helps to improve the thickness consistency and surface quality of the coating layer, reduce defects such as ripples and bubbles, and improve the appearance quality of the bar.

[0051] In some embodiments, the first connector 3 includes a first inlet 31 and two first outlets 32. The first inlet 31 is connected to the main pipe 1, and the two first outlets 32 are connected to two discharge pipes 2 in a one-to-one correspondence.

[0052] The first inlet 31 is connected to the main pipe 1 and is used to receive the mandrel material from the first extruder. The two first outlets 32 are respectively connected to the two discharge pipes 2, so as to evenly distribute the mandrel material into their respective discharge channels 21. This structural design realizes the efficient distribution of mandrel material and ensures that the flow rate is balanced and the pressure is stable between the two discharge paths.

[0053] Moreover, by rationally arranging the internal flow channels between the first inlet 31 and the two first outlets 32, for example, by setting the two internal flow channels as a V-shaped structure and designing the diameter of the flow channels to be gradually expanding along the material flow direction, it is beneficial to the smooth flow of the mandrel material during the diversion process, reducing problems such as eddies, excessive shearing, or pressure loss caused by abrupt changes in the flow channels. This V-shaped and gradually expanding flow channel structure can not only effectively improve the uniformity and stability of the mandrel material during the diversion process, but also reduce the resistance encountered by the material during the flow process, further ensuring the consistency of the material output at both ends of the discharge pipe 2 and the molding quality.

[0054] In some embodiments, the second connector 5 includes a second inlet 52 and two second outlets 53. The second inlet 52 is connected to the auxiliary pipe 4, and the two second outlets 53 are connected to two guide channels 62 in a one-to-one correspondence. The second inlet 52, connected to the auxiliary pipe 4, is used to receive auxiliary material from the second extruder. The two second outlets 53 are respectively connected to the guide channels 62 in the two mounting cavities 51, thereby accurately distributing the auxiliary material to the corresponding guide paths. This structural design achieves efficient distribution of the auxiliary material, ensuring uniform material flow and stable pressure in the guide channels 62 on both sides.

[0055] In some embodiments, the bar extrusion apparatus 100 includes a guide head 7, one end of which is connected to the auxiliary pipe 4, and the other end of which is connected to the second inlet 52. The guide head 7 is provided with a guide cavity 71, and the inner diameter of the guide cavity 71 gradually decreases along the flow direction of the auxiliary material.

[0056] One end of the guide head 7 is connected to the auxiliary pipe 4, and the other end is connected to the second inlet 52 on the second connector 5, which is used to guide the auxiliary material from the auxiliary pipe 4 into the interior of the second connector 5.

[0057] The guide head 7 has a guide cavity 71 inside. The inner diameter of the guide cavity 71 gradually decreases along the flow direction of the auxiliary material, forming a tapered flow channel structure. This design not only helps to improve the uniformity of the flow rate of the auxiliary material during the flow process, but also effectively enhances the flow pressure of the material, promotes the auxiliary material to enter the second connector 5 more concentratedly and smoothly, and further distributes it to the two guide channels 62, thereby improving the stability and control accuracy of the auxiliary material conveying, and providing good structural support for the uniformity and consistency of the outer coating quality of the mandrel.

[0058] In some embodiments, the discharge pipe 2 includes a first sub-pipe 23 and a second sub-pipe 24. The first sub-pipe 23 is disposed between the first connector 3 and the second connector 5, and the second sub-pipe 24 is disposed on the side of the second connector 5 opposite to the first connector 3.

[0059] The first sub-tube 23 is located between the first connector 3 and the second connector 5, and is used to receive the mandrel material diverted from the first connector 3 and provide a flow channel for the initial merging of the mandrel and auxiliary materials. The second sub-tube 24 is located on the side of the second connector 5 away from the first connector 3, and is used to guide the coated composite material to be conveyed towards the subsequent forming die. This segmented structure design not only facilitates the rational layout of each functional area, but also helps to optimize the flow channel characteristics of different stages such as mandrel conveying, auxiliary material introduction and composite forming, thereby improving the stability and control accuracy of the overall extrusion process. At the same time, this modular discharge tube 2 structure is also easy to disassemble, clean and replace, which helps to improve equipment maintenance efficiency.

[0060] Understandably, the diameter increases after the mandrel and auxiliary materials are combined, therefore, the inner diameter of the second sub-tube 24 is larger than the inner diameter of the sub-channel 61.

[0061] In some embodiments, the second connector 5 includes a body 54 and two connecting plates 55, both of which are detachably connected to the body 54 and are connected to two second sub-tubes 24 in a one-to-one correspondence.

[0062] The main body 54 is used to realize the integrated arrangement of auxiliary material diversion and guide channel 62. The two connecting plates 55 are both set on one side of the main body 54 and are connected to the main body 54 by bolts, so as to facilitate assembly, disassembly and maintenance.

[0063] Each connecting plate 55 corresponds to a second sub-tube 24 in a discharge pipe 2. The second sub-tube 24 and the second connector 5 are stably connected through a detachable connection method, which not only improves the connection strength and sealing of the overall structure, but also provides the possibility of flexible replacement for the production of products of different specifications, further enhancing the applicability and ease of operation of the equipment.

[0064] In some embodiments, the second sub-tube 24 includes a stepped portion 241, and both connecting plates 55 are provided with stepped holes, with the stepped portion 241 cooperating with the stepped holes.

[0065] The stepped part 241 is inserted into the stepped hole and forms a mating connection with it. This structural design not only realizes the precise positioning and stable installation between the second sub-tube 24 and the connecting plate 55, but also enhances the structural strength and sealing performance of the connection through the limiting effect of the stepped fit. This effectively prevents material leakage or flow deviation during high-pressure extrusion, further improving the stability and reliability of the composite material molding process. At the same time, the detachable stepped connection method is also convenient for disassembly, cleaning and replacement, which helps to improve equipment maintenance efficiency and adapt to the production needs of different specifications of products.

[0066] The following describes an embodiment of processing PEEK rods using the rod extrusion device 100 of this invention.

[0067] The formulation for preparing PEEK composite materials from extruded rods is: 30% CF + 70% PEEK particles.

[0068] PEEK granules with viscosities of 300-350 Pa*s, 400-450 Pa*s, and 500-550 Pa*s were prepared according to the proportions in the table below. Each mixture was thoroughly mixed using a mixer for 5 minutes. Granulation was then performed using a parallel co-rotating twin-screw extruder at a speed of 200 r / min, an extrusion speed of 20 kg / h, and an extrusion temperature of 380℃, with precise feeding using a loss-in-weight scale.

[0069] The table below shows the viscosity of the prepared material.

[0070] Three types of viscous materials were extruded into 50mm diameter rods using conventional methods and the rod extrusion device 100 of this utility model (hereinafter referred to as the machine model).

[0071] The specific extrusion process of a standard single 45-type extruder is as follows: the material is dried at 130℃-150℃ for 4-12 hours, and then fed into a 45-type single screw extruder for extrusion. The extrusion temperature is 380℃, the rotation speed is 5r / min, and the extrusion speed is 2.5kg / h.

[0072] The process parameters for this model are the same as those for a single 45-type extruder.

[0073] The mechanical properties of the bars extruded from the three different viscosities were tested using two different extrusion machines. The specific properties are shown in the table below:

[0074] Based on the tested mechanical properties of the bars, the properties of bars of different viscosities extruded by this machine are superior to those of bars extruded by conventional methods.

[0075] In particular, further tests were conducted to verify whether the coating effect of the extruded bar of the present invention was good.

[0076] Further verification was conducted by machining the extruded bars from both models to a diameter of 48mm (initial diameter 50mm) on a lathe. The conventionally extruded bar still exhibited weld lines, while the bar extruded from this machine remained weld-free. Preliminary verification indicates good coating effect and overall good fusion.

[0077] Further verification was conducted by testing the density of 50mm diameter and 5mm thickness rods extruded from both extrusion machines. The test results are as follows:

[0078] The test results show that the density of the extruded bars produced by this machine is highly consistent, and there are no pores in the middle of the bars, which further verifies that the bar coating effect of this machine is good and the performance is consistent.

[0079] To further verify the coating effect, the tribological properties of the extruded rods were tested. A novel tribological testing method was used.

[0080] A novel method is used to test the tribological properties of extruded bars. The scheme is as follows: (1) Cut a bar with a diameter of 50 mm and a height of 50 mm using a conventional extruder; This machine extrudes 50mm diameter bars, and after processing to remove 1mm of surface material, it produces bars with a diameter of 48mm and a height of 50mm.

[0081] (2) A friction and wear test ring is used. The test ring is arc-shaped and can completely cover the test bar.

[0082] (3) Apply force to the test ring to make it move like a piston and rub against the surface of the bar.

[0083] Do not prepare friction test specimens using conventional extruded rods and machine-type extruded rods. The test data are as follows:

[0084] Further verification showed that the extruded bars produced by this model have good coating properties and consistent internal and external performance.

[0085] To further verify the coating effect, the Shore hardness of the extruded bar was tested, and the indentation hardness was measured using a Shore hardness tester.

[0086] The specimen thickness should be at least 4 mm, and can be achieved by stacking several thinner layers to form the required thickness. Because the surface contact between layers is not perfect, test results may differ from those obtained from a single specimen. The specimen size should be large enough to ensure that measurements are taken at least 9 mm from any edge, unless it is known that measurements at smaller distances from the edge will yield the same results. The specimen surface should be flat, and the area covered by the indenter in contact with the specimen should have a radius of at least 6 mm from the tip of the indenter. Hardness measurements should be avoided on curved, uneven, or rough surfaces.

[0087] Place the sample on a hard, stable, horizontal surface. Hold the hardness tester vertically, ensuring the tip of the indenter is at least 9 mm from any edge of the sample. Immediately apply the indenter to the sample without impact, parallel to the sample, applying sufficient pressure until the indenter and sample are in close contact. For best reproducibility, use a hardness tester stage or the central axis of the indenter to add weights to the indenter. The recommended mass for a Type D hardness tester is 5 kg. Read the indicator reading after (15 ± 1) s. If an instantaneous reading is specified, read the maximum value of the hardness tester within 1 second after the indenter makes close contact with the sample. Measure five hardness values ​​on the same sample at least 6 mm apart and calculate their average.

[0088] The following are the hardness test data for the bars.

[0089] Based on the hardness test data above, the hardness of the extruded rods produced by conventional extruders is relatively poor, while the hardness of the rods extruded using this machine model is significantly improved, and the hardness of the inner and outer surfaces is highly consistent. This further verifies that the extruded rods produced by this machine model have good coating effect, highly consistent performance, and high fusion properties.

[0090] It should be noted that the above example uses composite materials as raw materials to extrude rods. The rod extrusion device 100 of this utility model can also be used to extrude pure thermoplastic resin into rods. For example, the total material entering the first extruder is a composite material, and the auxiliary material entering the second extruder can be the same composite material as the total material or pure thermoplastic resin. As another example, the total material entering the first extruder is a pure thermoplastic resin, and the auxiliary material entering the second extruder can be the same pure thermoplastic resin as the total material, or a composite material or a pure thermoplastic resin different from the total material. The embodiments of this utility model will not describe these applications in detail one by one.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A rod extrusion apparatus, characterized in that, include: The first extruder is equipped with a main pipe, and the main pipe has a main channel to allow the material to enter and form a mandrel; Two discharge pipes are arranged side by side and spaced apart, and each discharge pipe is provided with a discharge channel. The first connector connects the main pipe to the two discharge pipes; The second extruder is equipped with an auxiliary pipe, and the auxiliary pipe has an auxiliary channel to allow auxiliary materials to enter. The second connector connects the auxiliary pipe to the two discharge pipes, and the second connector is arranged at an interval from the first connector. The second connector has two mounting cavities. Two diversion sleeves are provided, each of which is located within the mounting cavity. Each diversion sleeve has a branch channel for communicating with the discharge channel. The outer circumferential surface of the diversion sleeve and the inner circumferential surface of the mounting cavity define a guide channel. The guide channel connects the auxiliary channel and the discharge channel. The guide channel is used to allow the auxiliary material to converge with the mandrel in the discharge channel and adhere to the outside of the mandrel to form a rod.

2. The bar extrusion apparatus according to claim 1, characterized in that, The outer peripheral surface of the diverter sleeve and the inner peripheral surface of the mounting cavity are both tapered surfaces. The outer peripheral side of the diverter sleeve is provided with a spiral protrusion to define a spiral groove. The spiral groove and the inner wall surface of the mounting cavity define the flow guiding channel.

3. The bar extrusion apparatus according to claim 2, characterized in that, The diverter sleeve includes a limiting part and a sleeve body. The spiral groove is provided on the sleeve body, and the second connector is provided with an installation groove. The limiting part cooperates with the installation groove.

4. The bar extrusion apparatus according to claim 1, characterized in that, The discharge pipe is provided with a dwell chamber, which is connected to the mounting chamber. The inner diameter of the dwell chamber gradually decreases along the flow direction of the mandrel.

5. The bar extrusion apparatus according to claim 1, characterized in that, The first connector includes a first inlet and two first outlets. The first inlet is connected to the main pipe, and the two first outlets are connected to the two discharge pipes in a one-to-one correspondence.

6. The bar extrusion apparatus according to claim 1, characterized in that, The second connector includes a second inlet and two second outlets. The second inlet is connected to the auxiliary pipe, and the two second outlets are connected to the two flow channels in a one-to-one correspondence.

7. The bar extrusion apparatus according to claim 6, characterized in that, The bar extrusion device includes a guide head, one end of which is connected to the auxiliary pipe and the other end of which is connected to the second inlet. The guide head has a guide cavity inside, and the inner diameter of the guide cavity gradually decreases along the flow direction of the auxiliary material.

8. The bar extrusion apparatus according to claim 1, characterized in that, The discharge pipe includes a first sub-pipe and a second sub-pipe. The first sub-pipe is located between the first connector and the second connector, and the second sub-pipe is located on the side of the second connector opposite to the first connector.

9. The bar extrusion apparatus according to claim 8, characterized in that, The second connector includes a body and two connecting plates, both of which are detachably connected to the body, and each of the two connecting plates is connected to one of the two second sub-tubes.

10. The bar extrusion apparatus according to claim 9, characterized in that, The second sub-tube includes a stepped portion, and both connecting plates are provided with stepped holes, the stepped portion cooperating with the stepped holes.

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