A plastic extrusion device for 3D molding

Abstract

The present invention discloses a plastic extrusion device for 3D molding, including a bar and a chassis, wherein the chassis is equipped with an extrusion head through a detachable mechanism, a driving motor is fixedly installed in the chassis, a material transmission mechanism is installed at the driving end of the driving motor, a clamping mechanism used in conjunction with the material transmission mechanism is installed on the chassis, a lower hopper is fixedly installed in the chassis through two support rods, and an accelerating transmission mechanism is installed on the chassis. The advantages are: applying multiple uniform elastic clamping forces to the bar, which can effectively improve the clamping effect of the bar without causing deformation, and can use the principle of frictional heat generation to preheat the bar, thereby improving its subsequent extrusion efficiency. When the bar is used, the remaining bar in the device can be quickly cooled and shaped, so that it can be quickly and completely separated from the device, preventing the melted end from sticking to the device when it is taken out and affecting the next use.

Description

Technical Field

[0001] The invention relates to the technical field of plastic processing, and in particular to a plastic extrusion device for 3D molding. Background Art

[0002] Plastics may have special chemical compositions or physical properties, and need to be adjusted to a filament or granular form suitable for 3D printing through an extruder. The extruder can convert the raw plastic into a form suitable for use in a 3D printer through heating, extrusion, and other processes.

[0003] Plastic needs to be transported before extrusion, but during the plastic transmission process, the plastic will be deformed under the extrusion of the feed shafts on both sides. It is very likely to get stuck in the next transmission process. The jam may cause the printer to stagnate at a critical position or the printing speed to be uneven, resulting in reduced printing quality, rough surface, and even poor interlayer adhesion. Summary of the invention

[0004] The purpose of the present invention is to solve the problem of deformation and jamming occurring during plastic transmission in the prior art, and to propose a plastic extrusion device for 3D molding.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A plastic extrusion device for 3D molding comprises a bar material and a chassis, wherein an extrusion head is installed on the chassis via a detachable mechanism, a drive motor is fixedly installed in the chassis, a material transmission mechanism is installed on the driving end of the drive motor, a clamping mechanism used in conjunction with the material transmission mechanism is installed on the chassis, a lower hopper is fixedly installed in the chassis via two support rods, an accelerating transmission mechanism is installed on the chassis, a limiting tube for conducting and cooling the bar material is installed on the chassis, a heating disk is fixedly installed on the extrusion head, a discharge head is fixedly connected to the extrusion head, and the heating disk is used to heat the discharge head.

[0007] Optionally, the detachable mechanism includes a connecting card fixedly mounted on the chassis, a docking card fixedly mounted on the extrusion head, the end face shape of the docking card is concave, the end face shape of the connecting card is convex, and ears are fixedly mounted on both sides of the chassis, both of the ears are threadedly connected to the extrusion head through bolts, and buffer springs are fixedly mounted between the two ears and the extrusion head.

[0008] Optionally, the material feeding mechanism includes a material feeding plate fixedly mounted on the driving end of the driving motor, a plurality of fixing plates are fixedly mounted around the material feeding plate, telescopic rods are fixedly mounted on the plurality of fixing plates, a concave clamp is fixedly mounted on the driving ends of the plurality of telescopic rods, a spring is commonly fixedly mounted between the plurality of concave clamps and the corresponding fixing plates, the end faces of the plurality of concave clamps are all concave, and the plurality of concave clamps are evenly and closely distributed with the driving end of the driving motor as the center, and a preheating component is commonly installed between the plurality of concave clamps and the lower hopper.

[0009] Optionally, the preheating component includes friction plates 2 respectively fixedly mounted on one side of multiple concave clamps, a vertical rod is fixedly mounted on the lower hopper, a friction plate 1 is fixedly mounted on the upper end of the vertical rod, and when the transfer disc rotates, multiple friction plates 2 are driven to generate heat by friction contact with friction plate 1 in turn.

[0010] Optionally, the clamping mechanism includes a sliding hole opened on the upper surface of the chassis, a pull rod is slidably installed in the sliding hole, a mounting rod is fixedly installed at the lower end of the pull rod, a support seat is slidably installed on one end of the mounting rod, and the support seat is fixedly connected to the chassis, a same-pole magnet is fixedly installed on the support seat, a magnet with the same magnetic force as the same-pole magnet is fixedly installed on the mounting rod, and the same-pole magnet and the magnet are located on the same vertical line, a crescent slide rail is fixedly installed on the other end of the mounting rod, the end face shape of the crescent slide rail is the same as the end face shape of the concave clamp, and the upper end of the crescent slide rail is located directly above the uppermost concave clamp, the curvature of the crescent slide rail is parallel to the curvature formed by multiple concave clamps, and the rod slides between the crescent slide rail and the multiple concave clamps, and a steering component is installed on the crescent slide rail.

[0011] Optionally, the steering component includes a connecting rod fixedly mounted on the lower end of the crescent slide rail, a spring coil is fixedly mounted on the lower ends of the two connecting rods, an arc plate is fixedly mounted on the spring coil, and the arc plate has a bending direction opposite to that of the crescent slide rail.

[0012] Optionally, the acceleration transmission mechanism includes a cooling metal tube fixedly connected to the chassis, a disc connected to the cooling metal tube is fixedly installed in the chassis, a plurality of slide grooves are opened on the disc, sliders are slidably installed in the plurality of slide grooves, a rotating disk is fixedly installed on the plurality of sliders, a plurality of the rotating disks are rotatably installed with rubber rods, and the remaining plurality of rotating disks are fixedly installed with rubber rods, the plurality of rubber rods are distributed in a circle, and two adjacent rubber rods are fitted together, a spiral strip is fixedly installed on each rubber rod, and the rotation directions of two adjacent spiral strips are opposite and fit together, the plurality of rotating disks are rotated together through a pulley and are sleeved with a belt, and a driving component for use with the belt is installed on the chassis.

[0013] Optionally, the driving component includes an installation groove opened in the chassis, in which multiple springs 2 are fixedly installed, one end of the multiple springs 2 is commonly fixedly installed with a slide, the slide is fixedly installed with a motor, and the driving end of the motor is fixedly installed with a rubber disc that fits the belt.

[0014] Optionally, a mounting frame is fixedly mounted on the outer side of the chassis, and a steering wheel used in conjunction with the rod is rotatably mounted on the mounting frame. The front side of the chassis is opened and a transparent cover for observing the internal situation of the device is fixedly mounted.

[0015] Optionally, a cooling fan is rotatably mounted on the chassis, a temperature control fan is rotatably mounted on the extrusion head, a servo motor electrically connected to the cooling fan and the temperature control fan is fixedly mounted on the chassis, and protective covers are fixedly mounted between the cooling fan and the chassis and between the temperature control fan and the extrusion head.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] In the above scheme, by setting up multiple concave clamps and multiple springs, the clamping force applied to the bar during transmission can be more uniform. By applying clamping force at multiple positions, local stress concentration can be reduced, thereby reducing the risk of deformation or damage of the object due to excessive local stress, and at the same time, the position of the bar can be better controlled.

[0018] By setting friction plate one and friction plate two, the rotation during rod transmission can be utilized to generate friction heat between friction plate one and friction plate two, thereby meeting the initial preheating of the rod, providing conditions for subsequent rod transmission and hot melting, and accelerating the extrusion of the rod.

[0019] By setting a cooling metal tube and a limiting tube, the bar can be cooled after processing and then taken out to prevent it from sticking to internal parts during the removal process, thereby achieving rapid cooling and shaping of the bar.

[0020] In summary, the present invention applies multiple uniform elastic clamping forces to the rod material, which can effectively improve the clamping effect of the rod material without causing it to deform. At the same time, it can use the principle of frictional heat generation to preliminarily preheat the rod material and improve its subsequent extrusion efficiency. When the rod material is used up, the remaining rod material in the device can be quickly cooled and shaped, so that it can be quickly and completely detached from the device, preventing the melted end from sticking in the device when it is taken out and affecting the next use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable those skilled in the relevant art to make and use the invention.

[0022] Figure 1 This is a schematic structural diagram of a plastic extrusion device for 3D molding proposed by the present invention;

[0023] Figure 2 It is a structural schematic diagram of the present invention rotated to a certain viewing angle;

[0024] Figure 3 It is a structural schematic diagram of the present invention rotated to another viewing angle;

[0025] Figure 4 It is a schematic diagram of the structure of the heating plate and the discharging head;

[0026] Figure 5 for Figure 4 A schematic diagram of the structure from another perspective;

[0027] Figure 6 It is a schematic diagram of the structure of the limit tube;

[0028] Figure 7 It is a structural diagram of the material transfer tray and crescent slide rail;

[0029] Figure 8 It is a schematic diagram of the structure of the limit tube and the cooling metal tube;

[0030] Fig. 9 It is a structural schematic diagram of spring 1 and friction plate 2;

[0031] Fig.10 It is a structural schematic diagram of the arc plate and the support seat;

[0032] Fig.11 It is a schematic diagram of the structure of the rotating disk and rubber rod.

[0033] In the figure: 1. extruder head; 2. heating plate; 3. discharge head; 4. temperature control fan; 5. docking card; 6. connecting card; 7. chassis; 8. cooling fan; 9. transparent cover; 10. rod; 11. steering wheel; 12. transfer plate; 13. crescent slide; 14. lower hopper; 15. limit tube; 16. servo motor; 17. cooling metal tube; 18. rubber rod; 19. support seat; 20. friction plate 1; 21. friction plate 2; 22. fixed plate; 23. telescopic rod; 24. spring 1; 25. concave clamp; 26. arc plate; 27. pull rod; 28. magnet; 29. ​​disc; 30. rotating disc; 31. belt; 32. slide plate; 33. spring 2; 34. motor; 35. rubber disc; 36. spiral strip.

[0034] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0035] The following is a detailed description of a plastic extrusion device for 3D molding provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0036] It should be noted that the references to "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0037] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0038] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers therebetween, and “on” or “over” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers therebetween.

[0039] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0040] Reference Figure 1-Figure 5 , a plastic extrusion device for 3D molding provided by an embodiment of the present invention comprises a rod material 10 and a chassis 7, wherein the chassis 7 is provided with an extrusion head 1 through a detachable mechanism, a heating plate 2 is fixedly mounted on the extrusion head 1, a discharge head 3 is fixedly connected to the extrusion head 1, and the heating plate 2 is used to heat the discharge head 3; the detachable mechanism comprises a connecting card plate 6 fixedly mounted on the chassis 7, a docking card plate 5 is fixedly mounted on the extrusion head 1, the end face shape of the docking card plate 5 is concave, and the end face shape of the connecting card plate 6 is convex, and the relative fixation between the chassis 7 and the extrusion head 1 can be achieved by slidingly engaging the docking card plate 5 and the connecting card plate 6. In order to ensure the connection stability between the chassis 7 and the extrusion head 1, the same end of the docking card plate 5 and the connecting card plate 6 is connected by a connecting plate ( Figure 1 Threaded mounting (shown in, drawn but not labeled) for easy removal.

[0041] A mounting frame is fixedly installed on the outer side of the chassis 7, and a steering wheel 11 used with the rod 10 is rotatably installed on the mounting frame. The chassis 7 is provided with a through hole, and the steering wheel 11 can limit the position of the rod 10 so that it can pass through the through hole into the chassis 7. The front side of the chassis 7 is opened and a transparent cover 9 for observing the internal situation of the device is fixedly installed. The transparent cover 9 is detachably fixed on the chassis 7, which is convenient for personnel to repair and replace parts in the chassis 7.

[0042] The two sides of the chassis 7 are fixedly mounted with lifting ears ( Figure 1 As shown in the figure, drawn but not marked), the two lifting ears are threadedly connected to the extrusion head 1 through bolts, the bolts slide on the two lifting ears respectively, and buffer springs are fixedly installed between the two lifting ears and the extrusion head 1. When the device is running, the buffer springs can be used to drive the bolts to slide relatively on the two lifting ears during the operation of the device, thereby reducing the vibration generated when the device is used.

[0043] A cooling fan 8 is rotatably mounted on the chassis 7, a temperature-adjusting fan 4 is rotatably mounted on the extrusion head 1, a servo motor 16 electrically connected to the cooling fan 8 and the temperature-adjusting fan 4 is fixedly mounted on the chassis 7, a protective cover is fixedly mounted between the cooling fan 8 and the chassis 7 and between the temperature-adjusting fan 4 and the extrusion head 1, the protective cover is used to protect the cooling fan 8 and the temperature-adjusting fan 4 to reduce the impact on personnel during use, and at the same time, a detachable threaded connection method can be adopted between the protective cover and the cooling fan 8 and the temperature-adjusting fan 4, so as to facilitate the cleaning and replacement of the cooling fan 8 and the temperature-adjusting fan 4.

[0044] Reference Figure 7-Figure 10 A driving motor is fixedly installed in the chassis 7, and a material feeding mechanism is installed on the driving end of the driving motor. The material feeding mechanism includes a material feeding tray 12 fixedly installed on the driving end of the driving motor. The material feeding tray 12 and the driving motor are connected in a detachable manner, which can facilitate the cleaning of the device and the replacement of damaged parts.

[0045] A plurality of fixing plates 22 are fixedly installed around the material transfer plate 12, and telescopic rods 23 are fixedly installed on the plurality of fixing plates 22. Concave clamps 25 are fixedly installed on the driving ends of the plurality of telescopic rods 23, and a spring 24 is fixedly installed between the plurality of concave clamps 25 and the corresponding fixing plates 22. The end faces of the plurality of concave clamps 25 are all concave, and the plurality of concave clamps 25 are evenly and closely distributed with the driving end of the driving motor as the center.

[0046] The chassis 7 is provided with a clamping mechanism used in conjunction with the material conveying mechanism, and the clamping mechanism includes a slide hole ( Figure 7 As shown in FIG. 1 , drawn but not marked), a pull rod 27 is slidably installed in the slide hole, and a mounting rod ( Figure 8 As shown in the figure, drawn but not marked), a support seat 19 is slidably mounted on one end of the mounting rod, and the support seat 19 is fixedly connected to the chassis 7, a magnet of the same sex is fixedly mounted on the support seat 19, a magnet 28 of the same magnetic force as the magnet of the same sex is fixedly mounted on the mounting rod, and the magnet of the same sex and the magnet 28 are located on the same vertical line, and a crescent rail 13 is fixedly mounted on the other end of the mounting rod, and the end face shape of the crescent rail 13 is the same as the end face shape of the concave fixture 25, and the upper end of the crescent rail 13 is located at the uppermost concave fixture 25. The crescent slide 13 is directly above the concave clamp 25. At this time, the bar 10 is smoothly inserted between the crescent slide 13 and the concave clamp 25 along the horizontal direction. The curvature of the crescent slide 13 is parallel to the curvature formed by the multiple concave clamps 25, which can adapt to the diameter of the bar 10 and make it subject to uniform clamping force. When the upper part is subjected to multiple uniform clamping forces, the clamping force at a single position can ensure a relatively small force state, but this state can still ensure the transmission of the bar 10 and reduce the deformation caused by clamping the bar 10.

[0047] A steering component is installed on the crescent slide 13, and the steering component includes a connecting rod fixedly installed at the lower end of the crescent slide 13, and a spring roll is fixedly installed at the lower ends of the two connecting rods. An arc plate 26 is fixedly installed on the spring roll, and the arc plate 26 is bent in the opposite direction to the crescent slide 13.

[0048] By turning on the driving motor, the material transfer plate 12 can be driven to rotate. The rotation of the material transfer plate 12 drives the multiple concave clamps 25 to rotate through the multiple telescopic rods 23, thereby cooperating with the crescent slide rail 13 to drive the rod 10 to rotate (such as Figure 8 As shown, under the action of multiple springs 24, the elastic clamping and transmission of the bar 10 can be realized. At the same time, the shape setting of multiple concave clamps 25 and the crescent slide rail 13 can prevent the bar 10 from being squeezed and deformed, thereby preventing the bar 10 from being jammed during transmission in the next step, thereby maintaining the smooth transmission of the bar 10 and improving the transmission effect of the bar 10.

[0049] The lower hopper 14 is fixedly installed in the chassis 7 through two support rods, and a preheating component is installed between the multiple concave clamps 25 and the lower hopper 14. The preheating component includes a friction plate 21 fixedly installed on one side of the multiple concave clamps 25, and a vertical rod ( Figure 8 As shown in the figure, drawn but not marked), a friction plate 20 is fixedly installed on the upper end of the vertical rod, and when the transfer plate 12 rotates, it will drive multiple friction plates 21 to contact and generate heat with the friction plate 20 in turn. The friction plate 20 can transfer the heat generated by friction to the concave clamp 25 fixed thereto, and preheat it as the bar 10 is conveyed.

[0050] When the transfer disc 12 rotates, it can drive multiple friction plates 21 to contact and rub with the friction plate 1 20, so that they generate heat and transfer the heat to the multiple concave clamps 25, and preliminarily preheat the parts of the bar stock 10 on the multiple concave clamps 25. The preheating can make the bar stock 10 easier to bend, so that it extends from between the arc plate 26 and the crescent slide rail 13 to the lower hopper 14, and then penetrates from between the multiple rubber rods 18 to reach the cooling metal tube 17, and then enters the extrusion head 1 from the lower end of the limit tube 15. The bar stock 10 is heated by the heating disc 2, and the melted bar stock 10 is extruded by the discharge head 3.

[0051] When the rod 10 extends from the lower end of the crescent slide rail 13, it will rebound due to its own hardness and extend along its bending angle. When it extends, it will conflict with the arc plate 26 and drive the arc plate 26 to rotate. However, under the action of the spring coil, the rod 10 can only extend downward along the direction of the arc plate 26, so that it can smoothly enter the lower hopper 14.

[0052] Reference Figure 5-Figure 8 as well as Fig.11An accelerating transmission mechanism is installed on the chassis 7. A limiting tube 15 for conducting cooling of the bar 10 is installed on the chassis 7. The limiting tube 15 is provided with multiple threads. By increasing the roughness of the surface of the limiting tube 15, the bar 10 can be pre-cooled when it is taken out after the work is completed, and the heat on the bar 10 can be preliminarily conducted through the limiting tube 15.

[0053] The accelerating transmission mechanism includes a cooling metal tube 17 fixedly connected to the chassis 7. The cooling metal tube 17 is located above the limiting tube 15 and can cool the melted end of the bar 10 again to prevent it from being blocked inside the device during the removal process, making it easier for personnel to remove it quickly and preventing its excessive temperature from causing harm to the staff.

[0054] A disc 29 connected to the cooling metal tube 17 is fixedly installed in the chassis 7, and a plurality of slide grooves are opened on the disc 29, and sliders are slidably installed in the plurality of slide grooves, and a rotating disc 30 is fixedly installed on the plurality of sliders, wherein rubber rods 18 are rotatably installed on a plurality of rotating discs 30, and rubber rods 18 are fixedly installed on the remaining plurality of rotating discs 30, and the plurality of rubber rods 18 are distributed in a circle, and a spiral strip 36 is fixedly installed on each rubber rod 18, and the rotation directions of two adjacent spiral strips 36 are opposite and fit together, and pulleys are fixedly installed on the plurality of rotating discs 30, and a belt 31 is provided on the plurality of pulleys for rotating together.

[0055] A driving component used in conjunction with the belt 31 is installed on the chassis 7, and the driving component includes a mounting groove opened in the chassis 7, in which a plurality of springs 33 are fixedly installed, and a slide plate 32 is fixedly installed on one end of the plurality of springs 33, and a motor 34 is fixedly installed on the slide plate 32, and a rubber disc 35 that fits the belt 31 is fixedly installed on the driving end of the motor 34.

[0056] The belt 31 has a certain tension. Under the tension of the belt 31, the spiral strips 36 on the multiple rubber rods 18 are driven by the multiple rotating disks 30 to resist the rod material 10. The setting of the spring 2 33 can ensure that the rubber disk 35 is always against the belt 31. By turning on the motor 34, the rubber disk 35 can be driven to rotate, and the friction between the rubber disk 35 and the belt 31 is used to drive the belt 31 to rotate. The rotation of the belt 31 can drive the multiple rubber rods 18 fixedly connected to the rotating disk 30 to rotate. The rotation of the multiple rubber rods 18 fixedly connected to the rotating disk 30 can drive the multiple rubber rods 18 rotatably connected to the rotating disk 30 to rotate in the opposite direction, so that the rotation directions of two adjacent rubber rods 18 are opposite.

[0057] Both spiral strips 36 can be made of rubber. When the rod 10 extends downward, the rotation of the multiple rubber rods 18 can drive the rod 10 to be quickly transmitted downward, thereby accelerating the transmission speed of the rod 10 and improving the extrusion efficiency of the rod 10. At the same time, the reverse rotation between the multiple rubber rods 18 and the reverse rotation setting of the multiple spiral strips 36 can prevent the rod 10 from twisting while being quickly transmitted.

[0058] The working principle provided by the present invention is:

[0059] Install the device: by engaging the docking card plate 5 with the connecting card plate 6, and connecting the chassis 7 with the extrusion head 1 with two bolts, respectively slidingly installing the two bolts on the two ears on the chassis 7, and then threading the two bolts with the extrusion head 1, and fixing a buffer spring between the extrusion head 1 and the two ears, the buffer spring can reduce the vibration generated when the device is running;

[0060] The bar 10 is installed on the device: the bar 10 is passed through the steering wheel 11 and the perforation into the chassis 7, and the pull rod 27 is manually pulled upward to drive the crescent slide 13 to move upward through the installation rod, so that the distance between the crescent slide 13 and the corresponding multiple concave clamps 25 is increased, and then one end of the bar 10 is passed between the crescent slide 13 and the concave clamp 25, and then the pull rod 27 is released, and the crescent slide 13 is driven back to the initial position (so that the distance between the crescent slide 13 and the multiple concave clamps 25 is equal) through the installation rod under the repulsive force of the magnet 28 and the same-sex magnet, and the concave clamps 25 are driven to elastically clamp the bar 10 under the cooperation of the multiple springs 24 and the multiple telescopic rods 23;

[0061] The rod 10 is subjected to hot melting treatment: the driving motor is then turned on to drive the material transfer plate 12 to rotate, and the rotation of the material transfer plate 12 drives the multiple concave clamps 25 to rotate through the multiple telescopic rods 23, thereby cooperating with the crescent slide rail 13 to drive the rod 10 to rotate clockwise (such as Figure 8 As shown in the figure, the transfer plate 12 rotates and can drive the friction plates 21 to contact and rub with the friction plates 1 20, so that the friction plates 21 generate heat and transfer the heat to the concave clamps 25, and preliminarily preheat the bar 10. The preheating can make the bar 10 extend from between the arc plate 26 and the crescent slide rail 13 to the lower hopper 14, and then pass through between the multiple rubber rods 18 to reach the cooling metal tube 17, and then enter the extrusion head 1 from the lower end of the limit tube 15, and heat the bar 10 through the heating plate 2, and the melted bar 10 is extruded from the discharge head 3;

[0062] Take out the remaining unmelted rod 10: When the plastic extrusion is finished, there will be remaining rod 10 in the device. Pull the rod 10 upward. During the process of pulling the rod 10 upward, the melted part at the end will be cooled by the cooling metal tube 17, and the end will be solidified to prevent the shape from changing and causing jamming or adhesion during the removal process.

[0063] During the above operation, the servo motor 16 is turned on throughout the whole process, so that it drives the temperature control fan 4 and the cooling fan 8 to dissipate heat from the device, thereby increasing the service life of the device (long-term high temperature may accelerate the aging process of the internal components of the device).

[0064] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0065] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A plastic extrusion device for 3D molding, characterized in that: It includes a rod material and a chassis, wherein the chassis is equipped with an extrusion head through a detachable mechanism, a driving motor is fixedly installed in the chassis, and a material conveying mechanism is installed at the driving end of the driving motor; The material conveying mechanism comprises a material conveying plate fixedly mounted on the driving end of the driving motor, a plurality of fixing plates are fixedly mounted on a circle of the material conveying plate, telescopic rods are fixedly mounted on the plurality of fixing plates, a concave clamp is fixedly mounted on the driving ends of the plurality of telescopic rods, a spring is fixedly mounted between the plurality of concave clamps and the corresponding fixing plates, the end faces of the plurality of concave clamps are all concave, and the plurality of concave clamps are evenly and closely distributed with the driving end of the driving motor as the center, and a preheating component is installed between the plurality of concave clamps and the lower hopper; The chassis is provided with a clamping mechanism used in conjunction with a material transmission mechanism, a lower hopper is fixedly installed in the chassis through two support rods, an accelerating transmission mechanism is installed in the chassis, the accelerating transmission mechanism comprises a cooling metal pipe fixedly connected to the chassis, a disc connected to the cooling metal pipe is fixedly installed in the chassis, a plurality of slide grooves are provided on the disc, a plurality of slide grooves are slidably installed with sliders, a plurality of sliders are fixedly installed with rotating disks, a plurality of rotating disks are rotatably installed with rubber rods, and a plurality of other rotating disks are fixedly installed with rubber rods, a plurality of the rubber rods are distributed in a circular shape, and two adjacent rubber rods are fitted with each other, a spiral strip is fixedly installed on each rubber rod, and the rotation directions of two adjacent spiral strips are opposite and fitted with each other, a plurality of the rotating disks are jointly rotated through a pulley and are sleeved with a belt, and a driving component used in conjunction with the belt is installed on the chassis; The chassis is provided with a limit tube for conducting cooling of the bar material, the extrusion head is fixedly provided with a heating disk, the extrusion head is fixedly connected with a discharge head, and the heating disk is used for heating the discharge head.

2. The plastic extrusion device for 3D molding according to claim 1, characterized in that: The detachable mechanism includes a connecting card fixedly mounted on the chassis, a docking card fixedly mounted on the extrusion head, the end face shape of the docking card is concave, the end face shape of the connecting card is convex, ears are fixedly mounted on both sides of the chassis, both of the ears are threadedly connected to the extrusion head through bolts, and buffer springs are fixedly mounted between the two ears and the extrusion head.

3. The plastic extrusion device for 3D molding according to claim 1, characterized in that: The preheating component includes friction plates 2 fixedly mounted on one side of multiple concave clamps, a vertical rod fixedly mounted on the lower hopper, a friction plate 1 fixedly mounted on the upper end of the vertical rod, and when the transfer disc rotates, multiple friction plates 2 are driven to generate heat by friction contact with the friction plate 1 in turn.

4. The plastic extrusion device for 3D molding according to claim 3, characterized in that: The clamping mechanism includes a sliding hole opened on the upper surface of the chassis, a pull rod is slidably installed in the sliding hole, a mounting rod is fixedly installed at the lower end of the pull rod, a support seat is slidably installed on one end of the mounting rod, and the support seat is fixedly connected to the chassis, a same-pole magnet is fixedly installed on the support seat, a magnet with the same magnetic force as the same-pole magnet is fixedly installed on the mounting rod, and the same-pole magnet and the magnet are located on the same vertical line, a crescent slide rail is fixedly installed on the other end of the mounting rod, the end face shape of the crescent slide rail is the same as the end face shape of the concave fixture, and the upper end of the crescent slide rail is located directly above the uppermost concave fixture, the curvature of the crescent slide rail is parallel to the curvature formed by multiple concave fixtures, and the rod material slides between the crescent slide rail and the multiple concave fixtures, and a steering component is installed on the crescent slide rail.

5. The plastic extrusion device for 3D molding according to claim 4, characterized in that: The steering component comprises a connecting rod fixedly mounted on the lower end of the crescent slide rail, a spring coil is fixedly mounted on the lower ends of the two connecting rods, an arc plate is fixedly mounted on the spring coil, and the bending direction of the arc plate is opposite to that of the crescent slide rail.

6. The plastic extrusion device for 3D molding according to claim 1, characterized in that: The driving component includes an installation groove opened in the chassis, in which multiple springs 2 are fixedly installed, one end of the multiple springs 2 is commonly fixedly installed with a slide, the slide is fixedly installed with a motor, and the driving end of the motor is fixedly installed with a rubber disc that fits the belt.

7. The plastic extrusion device for 3D molding according to claim 1, characterized in that: A mounting frame is fixedly installed on the outer side of the chassis, and a steering wheel used in conjunction with the rod material is rotatably installed on the mounting frame. The front side of the chassis is opened and a transparent cover for observing the internal situation of the device is fixedly installed.

8. The plastic extrusion device for 3D molding according to claim 1, characterized in that: A cooling fan is rotatably mounted on the chassis, a temperature-adjusting fan is rotatably mounted on the extrusion head, a servo motor electrically connected to the cooling fan and the temperature-adjusting fan is fixedly mounted on the chassis, and protective covers are fixedly mounted between the cooling fan and the chassis and between the temperature-adjusting fan and the extrusion head.

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