Extrusion die and alternating soft and hard extrusion system

Abstract

The utility model provides an extrusion mould, it includes mould body, the first feed port, second feed port are arranged to mould body rear part, the mould body axial position forms extrusion channel, the coaxial fixed setting guide rod in extrusion channel, form the shaping space between extrusion channel and guide rod, the shaping space corresponds to the product export of mould body front end position, the first feed port and second feed port are connected to the shaping space, the extrusion mould passes through the setting to form the shaping space with the first feed port and the second feed port's intercommunication structure application, to can make input two kinds of material and carry out the comprehensive processing application of pipe material, through the control organization material input, or can carry out the independent processing of different single material pipe, or can carry out the comprehensive processing of mixed material pipe, or can carry out the comprehensive processing of sectional material continuous pipe, satisfy the need of specific pipe processing application, simultaneously this extrusion mould can realize structure installation based on simple front and back side assembly combination, and its overall structure has the characteristics such as simple setting, convenient installation and maintenance.

Description

Technical Field

[0001] This utility model relates to the field of pipe processing technology, specifically to an extrusion die and a soft-hard alternating extrusion system. Background Technology

[0002] Extrusion dies are a type of molding die, and their discharge method is achieved through the extrusion action. They are widely used in the production and molding industry of plastic materials. Extrusion dies are generally located at the front end of the extruder and are used to produce pipes or profiles. Existing pipe extrusion dies, such as those described in technical solution CN102275287A, exhibit a certain degree of complexity in their installation structure.

[0003] In the medical field, medical catheters are commonly used medical tools, ranging from large gastric tubes to small cerebrovascular interventional catheters. These catheter products are primarily used for establishing access during medical procedures, delivering implantable devices, injecting diagnostic reagents, or directly aspirating thrombi, and their usage frequency is very high. Among them, the segmented, gradually varying stiffness catheter is a specially designed catheter designed to improve its operability and safety in complex internal or vascular anatomy. The design concept of this catheter is to achieve variations in stiffness along its length, giving the catheter both flexibility and support, better adapting to different surgical procedures. Utility Model Content

[0004] This invention provides an extrusion die to overcome the shortcomings of the prior art.

[0005] An extrusion die includes a die body, a first feed port and a second feed port at the rear of the die body, an extrusion channel formed at the axial center of the die body, a guide rod coaxially fixed in the extrusion channel, and a forming space formed between the extrusion channel and the guide rod; the forming space forms a product outlet corresponding to the front end of the die body; the first feed port and the second feed port are connected to the forming space.

[0006] Furthermore, the mold body includes a first flow divider plate, a second flow divider plate, an adjusting plate, and an outlet mold arranged from back to front. The first flow divider plate is provided with a first feed port. A first flow divider cone is provided in a conical shape at the center of the first flow divider plate facing forward. A conical channel that passes through and engages with the guide rod is provided at the axial center of the first flow divider plate and the first flow divider cone. The extrusion channel is provided at the axial center of the outlet mold.

[0007] Furthermore, a second diversion cone is provided in a cone shape at the center of the second diversion plate, and a first inverted cone-shaped access space is formed on the rear side of the second diversion plate corresponding to the first diversion cone and penetrating the second diversion plate. A first material channel for inputting the first material is formed between the first access space and the outer periphery of the first diversion cone. The first feed port is connected to the first material channel.

[0008] Furthermore, a first diversion groove is recessed on the front side of the first diversion plate, and a plurality of first receiving recesses are provided around the outer periphery of the first diversion cone. A first diversion interface is provided on the front side of the first diversion plate, and a first feeding channel is provided inside the first diversion plate to connect the first diversion interface and the first feeding port. The first feeding port is connected to the first material channel via the first feeding channel, the first diversion interface, and the first diversion groove to each of the first receiving recesses.

[0009] Furthermore, a second inverted cone-shaped access space is formed on the rear side of the regulating plate corresponding to the second diversion cone and extending through the regulating plate. A second material channel for inputting the second material is formed between the second access space and the outer peripheral side of the second diversion cone. The second feed port is connected to the second material channel.

[0010] Furthermore, the second feed inlet is disposed on the first diverter plate, the first diverter plate is provided with a second feed channel, the second diverter plate is provided with a second feed channel, and the second feed channel forms a second diversion interface corresponding to the front side of the second diverter plate; the front side of the second diverter plate is recessed with a second diversion groove, and the second diversion groove is provided with a plurality of second receiving recesses around the outer periphery of the second diversion cone, and the second feed inlet is connected to the second material channel via the second feed channel, the second feed channel, the second material interface, the second diversion groove to each of the second receiving recesses.

[0011] Furthermore, a contact heating assembly is provided around the outer periphery of the mold body.

[0012] Furthermore, the mold body is provided with a plurality of adjustment mechanisms for adjusting the wall thickness of the extruded pipe evenly distributed around the outer periphery of the extrusion channel; a mounting cavity is recessed on the front side of the axis position of the adjustment plate, the exit mold is fixedly inserted into the mounting cavity, and the adjustment mechanism includes a plurality of adjustment channels evenly distributed radially in the adjustment plate that communicate with the mounting cavity. Adjustment bolts are screwed onto the adjustment channels, and one end of the adjustment bolt extends through the adjustment channel and abuts against the outer periphery of the exit mold.

[0013] The alternating hard and soft extrusion system, which is used in the extrusion die described above, also includes a first material output section for outputting hard material and a second material output section for outputting soft material, wherein the first material output section is connected to the first feed port.

[0014] Furthermore, a first pre-valve is provided at the output end of the first material output section and a first post-valve is provided at the input end of the first feed inlet; a second pre-valve is provided at the output end of the second material output section and a second post-valve is provided at the input end of the second feed inlet.

[0015] The beneficial effects of this utility model are as follows:

[0016] The extrusion die, through the application of a forming space centered on an axis and a connecting structure between the first and second feed ports, allows for the comprehensive processing of pipes from two different materials. By controlling the material input, it can perform independent processing of pipes from different single materials, comprehensive processing of pipes from mixed materials, or comprehensive processing of continuous pipes from segmented materials, thus meeting the needs of specific pipe processing applications. At the same time, the extrusion die can be installed based on a simple front and rear assembly combination, and its overall structure is characterized by simple setup and convenient installation and maintenance.

[0017] The soft-hard alternating extrusion system can effectively integrate the equipment structure, and introduce different materials into the extrusion die for collaborative extrusion of pipes, thereby improving the production efficiency of pipes of different materials or segmented continuous pipes on demand. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the alternating pipe extrusion system of this utility model.

[0019] Figure 2 This is an exploded view of the extrusion die of this utility model.

[0020] Figure 3 This is a schematic diagram of the structural setup of the extrusion die of this utility model.

[0021] Figure 4 for Figure 3 A partial structural diagram of A.

[0022] Explanation of reference numerals in the attached figures:

[0023] Extrusion die 1, first feed inlet 11, second feed inlet 12, product outlet 13, extrusion channel 131, guide rod 132, forming space 133.

[0024] 2. First diversion plate; 21. First diversion cone; 22. Cone channel; 23. First material channel; 24. First diversion groove; 25. First receiving recess; 26. First diversion interface; 27. First feed channel; 28. Second feed channel.

[0025] Second diversion plate 3, second diversion cone 31, first inlet space 32, second material channel 33, second feed channel 34, second diversion interface 35, second diversion groove 36, second receiving recess 37.

[0026] Adjustment plate 4, second access space 41, mounting cavity 42, adjustment mechanism 43, adjustment channel 431, adjustment bolt 432

[0027] Export mold 5, pressure plate 51, guide joint surface 52, intersection position 53

[0028] Heating component 6, heating cylinder 61, heating plate 62

[0029] First material output unit 100, first pre-valve 101, first post-valve 102

[0030] Second material output section 200, second pre-valve 201, second post-valve 202. Detailed Implementation

[0031] To make the technical solution, purpose and advantages of this utility model clearer, the following explanation is given in conjunction with the accompanying drawings and embodiments.

[0032] like Figures 1 to 4 As shown, this utility model provides a structural arrangement scheme for an alternating pipe extrusion system: it includes an extrusion die 1, a first material output section 100 for outputting a first material, and a second material output section 200 for outputting a second material. The extrusion die 1 is provided with a first feed inlet 11, a second feed inlet 12, and a product outlet 13. The first material output section 100 is connected to the first feed inlet 11, and the second material output section 200 is connected to the second feed inlet 12. By executing a pipe processing method, a continuous pipe product with segmented material arrangement can be prepared.

[0033] In the structural configuration, the extrusion mold 1 includes a mold body, a first feed port 11 and a second feed port 12 are provided at the rear of the mold body, an extrusion channel 131 is formed at the axial center of the mold body, a guide rod 132 is coaxially fixed in the extrusion channel 131, and a forming space 133 is formed between the extrusion channel 131 and the guide rod 132; a product outlet 13 is formed at the center of the front end of the mold body in the forming space 133; the first feed port 11 and the second feed port 12 are connected to the forming space 133.

[0034] In application, the first material and the second material can be selected as hard material and soft material respectively, depending on their material texture. The alternating pipe extrusion system can thus perform pipe extrusion applications with alternating hard and soft materials.

[0035] In the processing methods of segmented material pipes:

[0036] First, the first material conveying unit transports the first material through the first inlet 11 to the first material channel 23, allowing the first material to be input into the forming space 133. Under the shaping influence of the extrusion channel 131 and the guide rod 132, the first material in the forming space 133 is shaped. Preferably, the forming space 133 is configured to extend in a straight cylindrical shape, allowing the first material to be shaped into a straight cylindrical shape. Then, the shaped first material is extruded from the product outlet 13 of the forming space 133, forming the first material tube segment.

[0037] While the first material is conveyed by the first material conveying unit, the second material conveying unit also conveys the second material through the second inlet 12 into the second material channel 33. After the first material tube segment is formed, the first material conveying is stopped, and the second material is simultaneously controlled to be input from the second material channel 33 into the forming space 133. The second material is shaped in the forming space 133 and fuses with the rear end of the first material segment at the product outlet 13. With continuous conveying of the second material, the second material fused with the first material segment is extruded from the product outlet 13 of the forming space 133, forming the second material tube segment fused with the rear end of the first material segment, thus obtaining a set of continuous cylindrical tube products with segmented different materials.

[0038] After the second material tube segment is extruded, the second material conveying can be stopped, and the first material can be controlled to be input from the first material channel 23 to the forming space 133. The above processing flow is repeated to control the alternating conveying of the first material and the second material to form a continuous multi-segment combination of pipes made of different materials.

[0039] During the above steps, the first and second materials need to be continuously heated at controlled temperatures to maintain their molten state.

[0040] Specifically, the mold body structure includes a first flow divider 2, a second flow divider 3, an adjusting plate 4, and an outlet mold 5 arranged from back to front. A contact heating assembly 6 is provided around the outer periphery of the mold body.

[0041] The first flow divider plate 2 is provided with a first feed inlet 11. The first flow divider plate 2 is provided with a first flow divider cone 21 that is tapered from back to front and narrows towards the axis. The first flow divider plate 2 and the first flow divider cone 21 are provided with a conical channel 22 for the guide rod 132 to pass through and be positioned. The extrusion channel 131 is provided through the central axis of the outlet mold 5.

[0042] The second diverting plate 3 has a second diverting cone 31 that is tapered from back to front and narrows towards the axis. A first inverted cone-shaped access space 32 is formed on the rear side of the second diverting plate 3, corresponding to the first diverting cone 21 and extending through the second diverting plate 3. A first material channel 23 for inputting the first material is formed between the first access space 32 and the outer periphery of the first diverting cone 21. A first diverting groove 24 is recessed on the front side of the first diverting plate 2. Multiple first receiving recesses 25 are provided around the outer periphery of the first diverting cone 21 from the first diverting groove 24. A first diverting interface 26 is provided on the front side of the first diverting plate 2. A first feeding channel 27 is provided inside the first diverting plate 2, connecting the first diverting interface 26 and the first feeding port 11. The first feeding port 11 is connected to each of the first receiving recesses 25 via the first feeding channel 27, the first diverting interface 26, and the first diverting groove 24, thereby guiding and connecting the first feeding port 11 with the first material channel 23.

[0043] The adjustment plate 4 forms an inverted cone-shaped second access space 41 on the rear side corresponding to the second diversion cone 31. A second material channel 33 for inputting the second material is formed between the second access space 41 and the outer periphery of the second diversion cone 31. The second inlet 12 is disposed on the first diversion plate 2. The first diversion plate 2 is provided with a second inlet channel 28, and the second diversion plate 3 is provided with a second inlet channel 34. The second inlet channel 34 forms a second diversion interface 35 on the front side of the second diversion plate 3. A second diversion groove 36 is recessed on the front side of the second diversion plate 3. The second diversion groove 36 is provided with a plurality of second receiving recesses 37 around the outer periphery of the second diversion cone 31. The second inlet 12 is connected to each of the second receiving recesses 37 through the second inlet channel 28, the second inlet channel 34, the second material interface, and the second diversion groove 36. Thus, the second inlet 12 and the second material channel 33 are guided and connected.

[0044] Based on the arrangement of the first diversion plate 2, the second diversion plate 3, and the adjusting plate 4 in the front-to-back direction, the first material channel 23 and the second material channel 33 are distributed at intervals from back to front, so that they do not affect each other during the input process. The outer periphery is surrounded by a connected diversion groove, which effectively organizes the input of the first or second material to be evenly input from the outer periphery into the forming space 133, ensuring the consistency of the pipe extrusion forming.

[0045] In this embodiment, after the first diversion cone 21 is connected to the first access space 32, the front end of the first diversion cone 21 will extend out of the first access space 32 and be located in front of the front end of the second diversion cone 31. After the second diversion cone 31 is connected to the second access space 41, the front end of the second diversion cone 31 will extend out of the second access space 41 and be located in front of the adjusting plate 4. The outlet die 5 is provided with a guide surface 52 recessed inward on the rear side of its extrusion channel 131. The guide surface 52 smoothly transitions and fits with the inner end face of the second access space 41 of the adjusting plate 4. In the above structural configuration, the first material channel 23 and the second material channel 33 can form a meeting point 53 on the rear side of the input to the extrusion channel 131. During the material alternation process of extrusion, the replacement material can be fully mixed and fused with the replaced material to a certain extent, ensuring a uniform material transition between the two extruded material segments. This avoids the pipe structure from easily breaking at the material segment transition due to poor material transition, thus ensuring the stability of the extruded pipe structure.

[0046] Furthermore, the transition connection of segmented material pipes is better. In the application of the processing method, the conveying pressure of the first material output section 100 (as the conveying end of the first material) and the input pressure of the input end of the first material channel 23 (first feed port 11) can be monitored in real time; and the conveying pressure of the second material output section 200 (as the conveying end of the second material) and the input pressure of the input end of the second material channel 33 (second feed port 12) can be monitored in real time.

[0047] In the processing steps, when the material input is switched (taking the first material as the second material as an example), the first material channel 23 is closed to stop the first material from being conveyed. At this time, the input pressure at the input end of the first material channel 23 is monitored to have a pressure difference with the conveying pressure at the conveying end of the first material. Based on this feedback, the second material is controlled to be output from the second material channel 33.

[0048] In this embodiment, a first pre-valve 101 can be provided at the first material output section 100 and a first post-valve 102 can be provided at the first inlet 11 end to monitor the input pressure of the first pre-valve 101 and the first post-valve 102 on both sides in real time; a second pre-valve 201 can be provided at the second material output section 200 and a second post-valve 202 can be provided at the second inlet 12 end. When the first post-valve 102 is closed to stop the first material conveying, i.e., when the monitored first post-valve 102 has a pressure difference with the first pre-valve 101, the second post-valve 202 will be opened (the first pre-valve 101 and the second pre-valve 201 are normally open during operation) to control the second material to be output from the second material channel 33. During the process of closing the first post-valve 102 and opening the second post-valve 202, there is a process time. During this time, a portion of the first material is discharged through the first post-valve 102 during the closing process and a portion of the second material is discharged through the second post-valve 202 during the opening process, thereby allowing the material to mix more fully between the two material transition positions of the pipe product.

[0049] As a preferred configuration, in order to avoid processing errors and to adaptably adjust the wall thickness of the extruded pipe, in this embodiment, the product outlet 13 is annular, and adjustment pressure can be evenly applied to the outer periphery of the product outlet 13 to adjust the wall thickness of the extruded pipe.

[0050] In the mold body, multiple adjustment mechanisms 43 are evenly distributed around the outer periphery of the extrusion channel 131 to adjust the wall thickness of the extruded pipe. Specifically, a mounting cavity 42 is recessed on the front side of the axial position of the adjustment plate 4, and the outlet mold 5 is positioned in the mounting cavity 42. The adjustment mechanism 43 includes multiple adjustment channels 431 that are radially evenly distributed in the adjustment plate 4 and communicate with the mounting cavity 42. Adjusting bolts 432 are screwed onto the adjustment channels 431, and one end of the adjusting bolts 432 extends through the adjustment channels 431 and abuts against the outer periphery of the outlet mold 5. In this embodiment, four adjustment channels 431 are provided. The four sets of adjusting bolts 432 are screwed into and pressurized on the outside of the outlet mold 5 according to the actual processing conditions, so that the outlet mold 5 can produce a certain deformation effect, thereby pressing the extrusion channel 131 inward, realizing the spatial adjustment of the forming space 133, and thus meeting the pipe wall thickness adjustment requirements of the material extrusion.

[0051] In a preferred configuration, the mold body further includes a pressure plate 51 positioned and pressed against the front side of the outlet mold 5, and the mold body is cylindrical in shape. The heating assembly 6 includes a heating cylinder 61 surrounding the mold body and heating plates 62 connected to the front and rear sides respectively, so that the heating assembly 6 can surround the entire mold body and provide uniform heating.

[0052] The above description is only a preferred embodiment of the present utility model. For those skilled in the art, modifications can still be made to the embodiments without departing from the implementation principle of the present utility model, and the corresponding modifications should also be considered within the protection scope of the present utility model.

Claims

1. An extrusion die, characterized in that, The mold includes a mold body, a first feed port and a second feed port at the rear of the mold body, an extrusion channel at the axial center of the mold body, a guide rod coaxially fixed in the extrusion channel, and a forming space between the extrusion channel and the guide rod; the forming space corresponds to the front end of the mold body to form a product outlet; the first feed port and the second feed port are connected to the forming space.

2. The extrusion die as described in claim 1, characterized in that, The mold body includes a first flow divider plate, a second flow divider plate, an adjusting plate, and an outlet mold arranged from back to front. The first flow divider plate is provided with a first feed port. The center of the first flow divider plate is provided with a first flow divider cone in a conical shape facing forward. The first flow divider plate and the first flow divider cone are provided with a conical channel that passes through and cooperates with the guide rod at their axial center positions. The outlet mold is provided with an extrusion channel at its central axial center position.

3. The extrusion die as described in claim 2, characterized in that, The second diverter plate has a second diverter cone set in a cone shape facing forward in the center. The rear side of the second diverter plate is connected to the first diverter cone to form a first inlet space in an inverted cone shape. The first inlet space and the outer periphery of the first diverter cone form a first material channel for the input of the first material. The first feed port is connected to the first material channel.

4. The extrusion die as described in claim 3, characterized in that, The first diverter plate has a first diverter groove recessed on its front side. The first diverter groove has multiple first receiving recesses around the outer periphery of the first diverter cone. The first diverter plate has a first diverter interface on its front side. The first feed channel is provided inside the first diverter plate, connecting the first diverter interface and the first feed inlet. The first feed inlet is connected to the first material channel via the first feed channel, the first diverter interface, and the first diverter groove to each of the first receiving recesses.

5. The extrusion die as described in claim 3, characterized in that, The rear side of the regulating plate corresponds to the second diversion cone and forms an inverted cone-shaped second access space through the regulating plate. A second material channel for inputting the second material is formed between the second access space and the outer peripheral side of the second diversion cone. The second feed port is connected to the second material channel.

6. The extrusion die as described in claim 5, characterized in that, The second feed inlet is disposed on the first diverter plate. The first diverter plate is provided with a second feed channel and the second diverter plate is provided with a second feed channel. The second feed channel forms a second diverter interface on the front side of the second diverter plate. The front side of the second diverter plate is recessed with a second diverter groove. The second diverter groove is provided with a plurality of second receiving recesses around the outer periphery of the second diverter cone. The second feed inlet is connected to the second material channel via the second feed channel, the second feed channel, the second material interface, and the second diverter groove to each of the second receiving recesses.

7. The extrusion die as described in claim 1, characterized in that, The outer periphery of the mold body is surrounded by a contact heating component.

8. The extrusion die as described in any one of claims 2 to 6, characterized in that, The mold body is provided with a plurality of adjustment mechanisms for adjusting the wall thickness of the extruded pipe, which are evenly distributed around the outer periphery of the extrusion channel. The adjustment plate has a recessed mounting cavity on the front side of the axial position, and the exit mold is fixedly inserted into the mounting cavity. The adjustment mechanism includes a plurality of adjustment channels that are evenly distributed radially in the adjustment plate and communicate with the mounting cavity. Adjustment bolts are screwed onto the adjustment channels, and one end of the adjustment bolt extends through the adjustment channel and abuts against the outer periphery of the exit mold.

9. A soft-hard alternating extrusion system, characterized in that, The extrusion die as described in any one of claims 1 to 8 further includes a first material output section for outputting hard material and a second material output section for outputting soft material, wherein the first material output section is connected to the first feed port.

10. The alternating soft and hard extrusion system as described in claim 9, characterized in that, A first pre-valve is provided at the output end of the first material output section and a first post-valve is provided at the input end of the first feed inlet; a second pre-valve is provided at the output end of the second material output section and a second post-valve is provided at the input end of the second feed inlet.

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