Thermoforming machine discharge die

Abstract

The utility model relates to extruder technical field, and disclose a kind of hot forming machine discharge die, including extruder body and the butt joint of assembly in the output end of extruder, the die of discharge is fixedly installed in butt joint bottom, flow break structure is further provided on die, mounting hole is opened in flow break structure, die is fixedly installed in mounting hole, and regulating rod is further fixedly installed on flow break structure, temperature sensor is further fixedly installed in mounting hole, removable plug is further installed on die;Compared with the technical scheme of the conventional extruder change production and need to disassemble die, the present application does not need to disassemble and replace die, fundamentally avoids the problem of long-time shutdown of equipment caused by conventional disassembly operation, greatly improves the change production efficiency, and the assembly design of plug can prevent residual material in die from falling or being contaminated in subsequent production, reduces the product risk caused by residual material pollution of new material.

Description

Technical Field

[0001] This utility model relates to the field of extruder technology, specifically to a thermoforming machine discharge die head. Background Technology

[0002] A two-color extruder is an upgrade from a traditional single-screw extruder. It controls two plastic raw materials of different materials, colors, or properties to achieve integrated molding of a specific structure during the extrusion process. Its key structure includes two independent screw and barrel systems, responsible for the conveying, melting, and plasticizing of the two raw materials respectively. The discharge ends of the two units are joined together by a specially designed co-extrusion die. This type of extruder is widely used in plastic packaging, building materials (such as two-color profiles), and daily necessities, enabling both visual differentiation through two colors and a balance between product performance and production costs through an ABA composite structure.

[0003] In plastic packaging or profile manufacturing scenarios, extruders capable of producing basic two-color ABA / AB products require die replacement during product changeover. Since the die usually does not have a quick-release structure, and additional cleaning of residual molten plastic in the die flow channel is required during operation, the changeover process is extremely inefficient. Typically, it takes two skilled workers 1.5-2.5 hours to complete the disassembly of the old die, cleaning of residual material, installation of the new die, and sealing test. During this period, the equipment is completely shut down, which seriously affects the continuous production process. Utility Model Content

[0004] (I) Technical problem to be solved: In view of the shortcomings of the existing technology, this utility model provides a thermoforming machine discharge die head, which has the advantage of high extruder changeover efficiency and solves the problem of low die head replacement efficiency in the process of traditional extruder changeover.

[0005] (II) Technical Solution: To achieve the above-mentioned goal of high extruder production changeover efficiency, this utility model provides the following technical solution: a thermoforming machine discharge die head, including an extruder body and a connector assembled at the output end of the extruder. The bottom of the connector is fixedly installed with a discharge die head. The die head is also provided with a flow interruption structure that can change the die head temperature. The flow interruption structure has an installation hole. The die head is fixedly installed in the installation hole. A control rod for regulating the temperature of the flow interruption structure is also fixedly installed on the flow interruption structure. A temperature sensor is also fixedly installed in the installation hole. A detachable plug is also installed on the die head.

[0006] Preferably, the flow interruption structure is made of a thermally conductive material, and the control rod is connected to a cooling module and a heating module.

[0007] Preferably, the docking head is provided with three or more sets of the die heads, and the die heads are respectively connected to different material flow channels in the extruder through the docking head.

[0008] Preferably, the length of the plug is less than the length of the flow interruption structure, and the plug is made of heat-resistant material.

[0009] Preferably, a helical spring is also coaxially fixedly installed inside the mold head.

[0010] Preferably, the cooling module uses a semiconductor cooling chip, and the heating module uses a built-in resistance wire heating structure.

[0011] (III) Beneficial Effects: Compared with the prior art, this utility model provides a thermoforming machine discharge die head, which has the following beneficial effects: 1. This thermoforming machine discharge die head, through the combined use of a flow interruption structure and a plug structure, enables flexible switching between different composite structure production. Compared with the traditional extruder technology that requires disassembling the die head during production change, this application eliminates the need for die head disassembly and replacement, fundamentally avoiding the problems of long-term equipment downtime caused by traditional disassembly operations, greatly improving production change efficiency. Furthermore, the assembly design of the plug can prevent residual material inside the die head from falling or becoming contaminated in subsequent production, ensuring the cleanliness of the production process and reducing the risk of product defects caused by residual material contaminating new material.

[0012] 2. This thermoforming machine discharge die head, through the combined use of the die head structure and the helical spring structure, can generate turbulence and guidance for the plastic melt, ensuring the uniformity of temperature distribution during cooling and heating, avoiding the problem of local solidification or uneven melting caused by uneven heat distribution in the material head, thereby improving the stability of the material state and greatly improving the stability and efficiency of the flow interruption structure during production changeover. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the discharge die head of the thermoforming machine in this utility model; Figure 2 This is a three-dimensional schematic diagram of the butt joint structure of the discharge die head of the thermoforming machine in this utility model; Figure 3 This is a front view of the butt joint structure of the discharge die head of the thermoforming machine in this utility model; Figure 4 This is a cross-sectional view of the flow interruption structure of the discharge die head of the thermoforming machine in this utility model.

[0014] In the diagram: 1. Extruder body; 2. Connecting joint; 3. Die head; 31. Helical spring; 4. Flow interruption structure; 41. Control rod; 42. Temperature sensor; 5. Plug. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figures 1-4 A thermoforming machine discharge die 3 includes an extruder body 1 and a connector 2 assembled at the output end of the extruder. The discharge die 3 is fixedly installed at the bottom of the connector 2. The die 3 is also provided with a flow interruption structure 4 that can change the temperature of the die 3. The flow interruption structure 4 has an installation hole. The die 3 is fixedly installed in the installation hole. The installation hole adopts a cylindrical hole design that is adapted to the shape of the die 3. The inner wall of the installation hole is provided with an annular positioning step. The height of the step matches the height of the annular protrusion on the outer wall of the die 3 to form axial positioning. At the same time, the installation hole and the die 3 are assembled with a transition fit. During assembly, one end of the die 3 is first pushed in axially along the installation hole until the annular protrusion of the die 3 fits with the positioning step of the installation hole. Then, high-temperature resistant sealant is applied to the gap between the two to prevent the melt from leaking from the gap and to enhance the heat conduction efficiency of the two. A regulating rod 41 for regulating the temperature of the current-breaking structure 4 is also fixedly installed on the current-breaking structure 4. The regulating rod 41 has a cylindrical structure and is made of oxygen-free copper alloy with high thermal conductivity. The outer surface is covered with a high-temperature resistant insulating coating. The regulating rod 41 is fixed to the current-breaking structure 4 by a threaded connection. The current-breaking structure 4 has a pre-set threaded hole that matches the external thread of the regulating rod 41. During assembly, after the regulating rod 41 is screwed into the threaded hole, high-temperature resistant polytetrafluoroethylene raw material tape is wrapped around the threaded connection to achieve sealing and prevent loosening. A temperature sensor 42 is also fixedly installed in the mounting hole. The temperature sensor 42 is a high-temperature resistant PT100 platinum resistance sensor. Its probe part is cylindrical and covered with a stainless steel protective sleeve. An annular groove is pre-set on the inner wall of the mounting hole. The sensor is embedded in the annular groove. The outer wall of the probe and the inner wall of the groove are fixed by interference fit. The bottom of the groove is coated with high-temperature resistant thermal conductive silicone grease to enhance the heat conduction between the sensor and the current-breaking structure 4. The sensor lead is led out through a pre-set wire hole inside the current-breaking structure 4. The die head 3 is also equipped with a removable plug 5. The plug 5 adopts a stepped cylindrical structure with a circular gripping part. The main body material is made of high temperature resistant polyether ether ketone or stainless steel. The diameter of its step is adapted to the inner diameter of the discharge port of the die head 3. A high temperature resistant fluororubber sealing ring is fitted at the step. The plug 5 and the die head 3 are assembled by snap-fit ​​connection or threaded connection.

[0017] Please see Figures 1-4The flow interruption structure 4 is made of thermally conductive material and is entirely made of aluminum alloy or copper alloy with high thermal conductivity. The control rod 41 is connected to a cooling module and a heating module. The cooling module uses a semiconductor cooling chip, and the heating module uses a built-in resistance wire heating structure. The semiconductor cooling chip needs to be attached and fixed to the end of the control rod 41 away from the mold head 3. The hot end of the semiconductor cooling chip needs to be equipped with an aluminum heat sink and a axial flow fan for forced heat dissipation. High-temperature resistant thermally conductive grease is applied between the semiconductor cooling chip, the control rod 41, and the heat sink to fill the gaps and reduce thermal resistance. The electrodes of the semiconductor cooling chip are soldered to an external temperature control circuit board through high-temperature resistant wires, and the wire connection is fitted with an insulating heat-resistant sleeve. The built-in resistance wire is made of nickel-chromium alloy and is wound around a pre-set ceramic skeleton inside the control rod 41. Magnesium oxide powder is filled between the ceramic skeleton and the inner wall of the control rod 41, achieving both insulation between the resistance wire and the control rod 41 and ensuring efficient heat conduction to the control rod 41. The resistance wire's lead is also connected to the temperature control circuit board via high-temperature resistant wires, and the wire's through-hole inside the control rod 41 is sealed with high-temperature resistant sealant to prevent molten material from seeping in. This allows the semiconductor cooling chip to have advantages in both size and rapid temperature control response, quickly lowering the temperature of the flow interruption structure 4 below the material's melting point to achieve flow interruption, adapting to the compact installation space around the die head 3. On the other hand, the built-in resistance wire provides stable heating power and high temperature control accuracy, quickly raising the temperature of the flow interruption structure 4 to the material's melting temperature. The combination of these two features achieves bidirectional temperature control, solving the problem of traditional single-temperature control methods being unable to quickly interrupt flow. The connector 2 is equipped with three or more dies 3, which are connected to different material flow channels within the extruder via the connector 2. The connector 2 is made entirely of high-temperature resistant engineering plastic or aluminum alloy. Its shape is designed as a block or multi-port columnar structure. A sealing interface is provided at the top of the connector 2 where it connects to the extruder output end. The connector 2 also has independent flow channels machined inside, corresponding to the die head 3. One end of each flow channel connects to different material flow channels within the extruder, and the other end connects to the feed port of the corresponding die head 3 at the bottom. The length of the plug 5 is less than the length of the flow-blocking structure 4 to prevent the plug 5 from being excessively inserted into the die head 3. A helical spring 31 is also coaxially fixed inside the die head 3. The helical spring 31 is made of high-temperature resistant stainless steel, and its outer diameter is slightly smaller than the inner diameter of the flow channel in the die head 3 to ensure that the spring does not block the material flow channel. The axial length of the helical spring 31 is adapted to the length of the melt flow area inside the die head 3. The helical structure of the helical spring 31 generates a turbulent flow effect on the passing melt. During the cooling and flow interruption stage, the turbulence allows the melt to contact the low temperature transmitted by the inner wall of the die head 3 evenly, avoiding the problem of local melt solidifying first due to slow flow or not solidifying fully due to excessive flow. During the heating and melting stage, the turbulence can accelerate the transfer of heat in the melt, making the solidified melt melt quickly and evenly, and shortening the time for resuming discharge.Secondly, the coaxial fixing method of the helical spring 31 can prevent the spring from shifting under the impact of the melt, thus preventing blockage of the material flow or scraping of the inner wall of the die head 3.

[0018] Please see Figures 1-4 In actual operation, the extruder body 1 first transports the molten and plasticized plastic raw material to the connector 2 assembled at its output end. The connector 2 then guides raw materials of different materials into the corresponding die head 3 according to production requirements. The die head 3 is connected to different material flow channels in the extruder. During this process, the temperature sensor 42 in the installation hole of the flow interruption structure 4 monitors the temperature of the flow interruption structure 4 in real time and feeds back the data to ensure that the temperature meets the requirements of the raw material state. When producing ABA composite products, three sets of dies 3 respectively convey the outer layer A material, the middle layer B material, and another outer layer A material. The three sets of dies 3 work together to discharge materials to form an ABA composite structure. When it is necessary to switch from an ABA structure to an AB structure and to stop the discharge of one set of A dies 3, the control rod 41 matched with the corresponding A die 3 is first switched to the operation of the cooling module. The cooling module lowers the temperature of the flow interruption structure 4 corresponding to the A die 3 below the melting point of the raw material. The flow interruption structure 4 conducts the low temperature to the surface of the corresponding die 3 through its own thermal conductivity, causing the melt inside the die 3 to solidify rapidly and block the material flow. Then, the plug 5 is attached to the die 3 to prevent residual material inside the die 3 from falling or becoming contaminated in subsequent production processes. When it is necessary to switch back from an AB structure to an ABA structure, the A die 3 is first disassembled. The plug 5 on the die head 3 controls the corresponding regulating rod 41 to switch to the heating module. The heating module, through the regulating rod 41, raises the temperature of the flow interruption structure 4 back to the temperature required for the raw material to melt. The flow interruption structure 4 continues to conduct heat to the die head 3, causing the solidified raw material inside the die head 3 to remelt and regain its fluidity. The A die head 3 can then discharge material again. The entire production changeover process does not require disassembly or replacement of the die head 3, effectively shortening the equipment downtime for production changeovers. Furthermore, the temperature of the die head 3 is monitored in real time by the temperature sensor 42 throughout the entire process.

[0019] Please see Figures 1-4 When the flow interruption structure 4 adjusts the temperature of the die head 3 by regulating the temperature of the control rod 41, the helical spring 31 inside the die head 3 can turbulently and guide the plastic melt flowing through the die head 3. During the flow interruption cooling stage, this turbulence can ensure that the melt inside the die head 3 is in uniform contact with the low temperature conducted by the die head 3, avoiding uneven solidification caused by local cooling rate differences, and ensuring that the material can solidify. When the heating module is started to heat, the helical spring 31 can accelerate the heat transfer efficiency in the melt, causing the solidified material inside the die head 3 to melt faster and regain its fluidity.

[0020] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A thermoforming machine discharge die (3), comprising an extruder body (1) and a connector (2) assembled at the output end of the extruder, wherein the discharge die (3) is fixedly installed at the bottom of the connector (2), characterized in that: The die head (3) is also provided with a flow interruption structure (4) that can change the temperature of the die head (3). The flow interruption structure (4) has an installation hole. The die head (3) is fixedly installed in the installation hole. The flow interruption structure (4) is also fixedly installed with a control rod (41) for regulating the temperature of the flow interruption structure (4). The installation hole is also fixedly installed with a temperature sensor (42). The die head (3) is also installed with a detachable plug (5).

2. The discharge die head (3) of a thermoforming machine according to claim 1, characterized in that: The flow interruption structure (4) is made of thermally conductive material, and the control rod (41) is connected to a cooling module and a heating module.

3. The discharge die head (3) of a thermoforming machine according to claim 1, characterized in that: The connector (2) is provided with three or more sets of the die heads (3), and the die heads (3) are respectively connected to different material flow channels in the extruder through the connector (2).

4. The discharge die head (3) of a thermoforming machine according to claim 1, characterized in that: The length of the plug (5) is less than the length of the flow interruption structure (4), and the plug (5) is made of heat-resistant material.

5. The discharge die head (3) of a thermoforming machine according to claim 1, characterized in that: A helical spring (31) is also coaxially fixed inside the mold head (3).

6. The discharge die head (3) of a thermoforming machine according to claim 2, characterized in that: The cooling module uses a semiconductor cooling chip, and the heating module uses a built-in resistance wire heating structure.

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