CN206589348U - A kind of retracting device of small-sized 3D printing plastics - Google Patents

Abstract

The utility model discloses a small recycling device for plastics used in 3D printing, which belongs to the field of recycling plastics used in 3D printing, solves the problem of poor quality of recycled plastic threads in the prior art, and provides a technical solution to the problem It mainly includes the main frame and the crushing assembly located on the main frame, the melting extrusion assembly and the coil assembly. The crushing assembly is used to crush the recycled plastic and transport it to the melting extrusion assembly. The plastic is melted and extruded to form a plastic wire. The wire coil assembly is used to wind up the plastic wire. The melt extrusion assembly includes a hot melt chamber and an extrusion nozzle. The extrusion nozzle is located on the downstream side of the hot melt chamber. On the lateral side of the cavity, the extrusion nozzle faces the coil assembly. The utility model is mainly used for improving the quality of the plastic thread recycled by the recycling device.

Description

A small recycling device for plastics used in 3D printing

technical field

The utility model relates to the recycling of plastics for 3D printing, in particular to a small recycling device for plastics for 3D printing.

Background technique

As a rapid prototyping device, 3D printers are increasingly being used in production and life. Some schools, makers and small studios are also equipped with small 3D printers. Most of the existing small 3D printers are fusion deposition models, using plastic or materials with similar properties as printing consumables. During the printing process, discarded and useless 3D printed parts are often generated due to various reasons such as parameter errors or interruptions in the middle. Most of the existing disposal methods for such printouts are directly discarded. However, direct discarding of the waste prints produced will not only pollute the environment but also be uneconomical.

However, most of the existing plastic recycling methods for 3D printing use special drying and crushing devices and 3D printing consumable wire drawing equipment to cooperate with each other. These devices are mostly for industrial use, bulky and inconvenient to use. It is uneconomical for ordinary makers or home users and small studios, and it is not realistic to equip these devices. In fact, for ordinary makers, small studios or home users, the amount of plastic that needs to be recycled at a time is not much, and the waste printing parts generated during the use of 3D printers themselves have good remodeling and shredding performance. Therefore, having a desktop-grade recycled plastic for 3D printing can save money and protect the environment.

Utility model content

The purpose of the utility model is to provide a small recycling device for plastics used in 3D printing, so as to improve the quality of recycled plastic threads.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a small-sized plastic recycling device for 3D printing, including a main frame and a scrap assembly located on the main frame, a melt extrusion assembly and a coil assembly, and a scrap assembly It is used to crush the recycled plastic and convey it to the melt extrusion assembly. The melt extrusion assembly is used to melt and extrude the crushed plastic to form a plastic wire. The coil wire assembly is used to wind up the plastic wire. The melt extrusion assembly includes a hot melt A cavity and an extrusion nozzle, the extrusion nozzle is arranged on the downstream side of the hot-melt cavity, the wire coil assembly is located on the lateral side of the hot-melt cavity, and the extrusion nozzle faces the coil wire assembly.

Further, the melt extrusion assembly also includes a feeding chamber, a feeding motor, a feeding cylinder and a feeding screw, the feeding chamber is connected with the crushed material assembly, the feeding screw is arranged in the feeding cylinder and driven by the feeding motor to rotate, the feeding cylinder The upstream end communicates with the feeding chamber, the downstream end of the feeding cylinder is provided with a heat insulating piece, and the heat insulating piece is provided with a heat insulating channel, and the downstream end of the feeding cylinder communicates with the hot melt chamber through the heat insulating channel.

Further, a cooling element is provided between the heat insulating element and the downstream end of the feeding cylinder, the cooling element is provided with a cooling pipe, the cooling pipe communicates with the water pump and the water tank to form a cooling cycle, and the heat insulating element is connected to the feeding cylinder through the cooling element. The cooling part is provided with a cooling channel, and the downstream end of the feeding cylinder, the cooling channel, the heat insulation channel communicate with the hot melt cavity in sequence.

Further, a first heating element is fixed on the heat insulating element, and the hot melt chamber includes a first cavity disposed through the first heating element, and the first cavity communicates with the heat insulating channel.

Further, the downstream end of the first heating element is also provided with a second heating element, the hot melt cavity includes a second cavity arranged in the second heating element, the second cavity communicates with the first cavity, and the extrusion nozzle is set at The downstream end of the second heating element communicates with the second chamber.

Further, the feed chamber is provided with a first feed port communicated with the scrap assembly and a second feed port for inputting unused plastic raw materials, the first feed port is located on the side of the feed chamber , the second feed port is located at the upstream end of the feed chamber.

Further, the reel assembly includes a reel motor and a reel, a reel support is slidably connected to the connection base, the reel motor is fixed on the reel support, and the reel is rotatably connected to the reel support and connected with the reel The bracket is detachably connected, and the coil motor drives the coil to rotate, and the coil is higher than the extrusion nozzle.

Further, the connection base is equipped with a translation motor that drives the cable support to reciprocate relative to the connection base along the axial direction of the cable reel. The diameter of the plastic wire is D, and the translation motor drives the cable support to connect relative to each other after the cable reel rotates once. The base moves a distance D.

Further, a transmission screw is provided on the output shaft of the translation motor, and a translation nut that cooperates with the transmission screw is provided on the coil wire support, and the translation motor drives the transmission screw to rotate to make the translation nut translate, thereby driving the coil support to The connecting base moves in translation, and the translation nut moves to the end of the driving screw rod to be separated from the driving screw rod.

Further, the wire coil support is detachably connected to the connection base, and the recycling device also includes a cooling traction assembly for transporting the plastic wire to the 3D printer for printing, and the wire coil assembly and the cooling traction assembly can be connected to the connection base. Disconnect the connection.

Further, the cooling traction assembly includes a support base plate and a conveyor arranged on the support base plate, the support base plate is detachably connected to the connection base, the conveyor has a wire passing channel, and the extrusion nozzle and the wire passing channel are located on the same straight line.

Further, guide rollers and heat sinks are provided on the supporting bottom plate between the conveyor and the extrusion nozzle.

Further, the crushed material assembly includes a crushed material support, a crushed material motor and a crushed material knife, the crushed material support is fixed on the main frame, the crushed material support is provided with a crushing chamber, the crushing chamber is provided with a feeding port, the crushing chamber is connected with the melt extrusion The output components are connected, the crushing knife is installed in the crushing chamber, and the crushing motor drives the crushing knife to work. The crushing knife includes a knife shaft and blades. There are multiple blades arranged at intervals along the axial direction of the knife shaft. The blades have cutting teeth. There are a plurality of teeth distributed along the circumferential direction of the blade at intervals. In the circumferential direction of the same blade, cutting grooves are formed between adjacent cutting teeth. The teeth are misaligned, and at least two crushing knives are arranged in parallel. The working ranges of the blades of the two adjacent crushing knives overlap each other in the axial direction of the cutter shaft, and the rotation directions of the two adjacent crushing knives are opposite.

Further, the working surface of the cutting tooth is formed by the intersection of the first tooth side and the second tooth side, the extension length of the first tooth side is less than the extension length of the second tooth side, and the orientation of the cutting teeth is respectively the same as that of the first tooth side, the second tooth side An acute angle is formed between the tangential direction and the normal direction at the intersection of the second tooth flanks, and each cutting groove is respectively connected with a cutting tooth, and on the same cutting tooth, the first tooth flank forms a groove flank of the connected cutting grooves , the second tooth flank transitions to the next cutting groove, and the direction of the connected cutting groove is the same as that of the cutting tooth.

Further, the cutting groove includes a first groove side surface, a groove bottom surface and a second groove side surface, the first groove side surface, the groove bottom surface and the second groove side surface are sequentially connected, and the first tooth side surface on the cutting tooth connected with the cutting groove forms The second groove side, the second tooth side of the last cutting tooth is connected with the first groove side of the cutting groove through the first transition surface, the first groove side and the first tooth side are both planes, the first groove side and the first tooth An acute included angle α is formed between the side surfaces and the width of the notch of the cutting groove is greater than the width of the bottom of the groove.

Further, the crushed material support is also provided with a back-screen cavity, which is separated from the crushing chamber by a sieve plate. Holes, the bottom of the cavity after the sieve is provided with a discharge port, and the crushing chamber is connected with the melt extrusion component through the discharge port.

Further, the scrap support includes an upper frame body, a lower frame body and a material guide groove, the upper frame body and the lower frame body are connected to form a bearing seat for positioning the knife shaft, the upper frame body and the lower frame body form a crushing chamber, and the feeding port is located at The top of the upper frame body and the sieve plate are fixed on the bottom end surface of the lower frame body, the top of the material guide groove is pressed on the sieve plate, and the back cavity of the screen is located in the material guide groove.

Further, the crushed material support also includes a fixing seat, the upper frame body, the lower frame body and the material guide groove are fixed together on the fixed seat by long screws, and the crushed material support is fixed on the main frame through the fixed seat.

Further, the crushed material support also includes a mounting frame, the mounting frame is connected and fixed with the upper frame body and the lower frame body, the crushed material motor is fixed on the mounting frame, a transmission gear is provided on the cutter shaft, and two adjacent crushing knives are connected to each other. The transmission gear is meshed, and the installation frame is provided with a mounting groove for accommodating the transmission gear.

After adopting the above-mentioned technical scheme, the utility model has the following advantages: the extrusion nozzle 38 is arranged towards the wire coil assembly, which is equivalent to the movement route of the plastic from the melt extrusion assembly to the wire coil assembly after a 90-degree turn, so that the molten plastic needs to be filled with Most of the area of the hot melt chamber can extrude the plastic thread, that is, the air in the hot melt chamber is reduced, the generation of air bubbles is suppressed, and the pressure in the hot melt chamber is increased, which is conducive to improving the strength of the extruded plastic thread and facilitating the extrusion of the plastic thread. Timely processing after extrusion, such as winding or direct cooling and traction to the 3D printer for printing, can also reduce the flow rate of molten plastic, making the extrusion of plastic more dependent on the feed of upstream plastic rather than the flow of plastic after melting It is beneficial to affect the extrusion rate of the plastic wire by adjusting the feed speed of the plastic, and it is also easier to adjust the diameter of the plastic wire.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described:

Fig. 1 is a schematic structural view (1) of a recovery device for plastics used in 3D printing of the present invention;

Fig. 2 is a schematic structural view (two) of a recovery device for plastics used in 3D printing of the present invention;

Fig. 3 is a schematic structural view (3) of a recovery device for plastics used in 3D printing of the present invention;

Fig. 4 is a schematic structural view (1) of the scrap assembly in Embodiment 1 of the utility model;

Fig. 5 is the schematic diagram (1) of pulverizing blade in the utility model embodiment one;

Fig. 6 is the schematic diagram (2) of the pulverizing blade in the utility model embodiment one;

Fig. 7 is a schematic structural view (2) of the scrap assembly in Embodiment 1 of the utility model;

Fig. 8 is a structural schematic view (1) of the melt extrusion assembly in the first embodiment of the utility model;

Fig. 9 is a structural schematic diagram (2) of the melt extrusion assembly in the first embodiment of the utility model;

Fig. 10 is a structural schematic view (1) of the cable assembly in Embodiment 1 of the present utility model;

Fig. 11 is a schematic structural view (2) of the cable assembly in Embodiment 1 of the present utility model;

Fig. 12 is a structural schematic view (3) of the cable assembly in Embodiment 1 of the present utility model;

Fig. 13 is a schematic structural view of Embodiment 1 of the utility model;

Fig. 14 is a schematic structural view (1) of Embodiment 2 of the utility model;

Fig. 15 is a schematic structural diagram (2) of Embodiment 2 of the utility model.

Fig. 16 is a structural schematic view (1) of the cooling traction assembly in the third embodiment of the utility model;

Fig. 17 is a schematic structural diagram (2) of the cooling traction assembly in the third embodiment of the utility model.

detailed description

The utility model provides a plastic recovery device for 3D printing, as shown in Figure 1, Figure 2 and Figure 3, comprising a main frame 100, a scrap assembly 200 located on the main frame 100, a melting extrusion assembly 300 and a coil wire Component 400, the crushed material component 200 is used to pulverize the plastic and transport it to the melt extrusion component 300, the melt extrusion component 300 is used to melt and extrude the pulverized plastic to form a plastic wire, and the coil wire component 400 is used to wind the plastic wire , the melting extrusion assembly 300 comprises a hot melt chamber and an extrusion nozzle 38, the extrusion nozzle 38 is located on the downstream side of the hot melt chamber, the wire coil assembly 400 is positioned on the lateral side of the hot melt chamber, and the extrusion nozzle 38 faces the coil wire assembly .

In the utility model, the extrusion nozzle 38 is set towards the coil assembly, which is equivalent to a 90-degree turn of the movement route of the plastic from the melt extrusion assembly to the coil assembly, so that the melted plastic needs to be filled with most of the hot melt cavity to be extruded. Extruding the plastic thread reduces the air in the hot-melt cavity, suppresses the generation of air bubbles, increases the pressure in the hot-melt cavity, and helps to improve the strength of the extruded plastic thread, which is convenient for timely processing of the plastic thread after extrusion, such as collection Roll or directly cooled and pulled to the 3D printer for printing, and at the same time can reduce the flow rate of the molten plastic, so that the extrusion of the plastic is more dependent on the feed of the upstream plastic, rather than the fluidity of the melted plastic, which is conducive to adjusting the flow of the plastic It is also easier to adjust the diameter of the plastic thread by giving speed to affect the extrusion rate of the plastic thread.

Plastics not specifically mentioned in this utility model all refer to recycled 3D printing plastics. The upstream and downstream mentioned in the utility model are defined according to the conveying direction of the plastic, and the specific structure will be described below according to the processing sequence of the plastic from upstream to downstream.

Embodiment one:

First, look at the scrap assembly 200 in conjunction with FIGS. 4-7 .

The crushing assembly 200 includes a crushing support 21, a crushing motor 25 and a crushing knife 23, the crushing support 21 is fixed on the main frame 100, the crushing support 21 is provided with a crushing chamber 201, and the crushing chamber 201 is provided with a feeding port 2011, The crushing chamber communicates with the melting extrusion assembly, the crushing knife 23 is installed in the crushing chamber 201, the crushing motor 25 drives the crushing knife 23 to work, the crushing knife 23 includes a cutter shaft 231 and a blade 232, and the blade 232 is along A plurality of axial intervals are arranged, and the blade 232 has cutting teeth 233, and a plurality of cutting teeth 233 are distributed along the circumferential direction of the blade 232, and in the circumferential direction of the same blade 232, cutting grooves 234 are formed between adjacent cutting teeth 233, In the axial direction of the cutter shaft 231, two adjacent blades 232 are set at a staggered angle in the circumferential direction so that the cutting teeth 233 are dislocated, and at least two scrap knives 23 are arranged in parallel, and the blades 232 of the two adjacent scrap knives 23 The working areas overlap each other in the axial direction of the cutter shaft 231 , and the rotation directions of the two adjacent crushing knives 23 are opposite. The recycled plastics are cut through the cutting teeth 233 on the blade 232 of the adjacent scrap knife 23. Since the number of cutting teeth 233 is large, the purpose of crushing the recycled plastics into particles can be achieved, and the distribution of the cutting teeth 233 has certain rules. Therefore, the particle size of the recycled plastic pulverization is relatively uniform, thereby achieving a good and stable pulverization effect; a cutting groove 234 is formed between adjacent cutting teeth 233, and the cutting groove 234 can cooperate with the cutting teeth 233, because two adjacent scraps The direction of rotation of the knife 23 is opposite, and the distribution of the cutting teeth 233 on all the scrap knives 23 is the same, so in the crushing process, among the two adjacent scrap knives 23, the cutting teeth on one of the scrap knives 23 233 will squeeze the reclaimed plastic into the cutting groove 234 on another scrap knife 23, so that the resultant force formed by the action of two adjacent scrap knives 23 on the recycled plastic will not cause scrap Knife 23 blocks, and guarantees that the crushing work is carried out smoothly.

Seen from a crushing knife 23, after two adjacent blades 232 are arranged at a staggered angle in the circumferential direction, the cutting teeth 233 on all blades 232 are distributed in a regular manner similar to a helix, and the direction of rotation can be left-handed or right-handed, all The scrap knives 23 are all in the same direction. During the rotation of the scrap knife 23, the cutting teeth 233 in the same helical direction sequentially squeeze and cut the recycled plastic, so that the scrap knife 23 is subjected to a small and uniform force during the rotation, and can cut the recycled plastic more stably. plastic.

The working range of the blade 232 of the scrapping knife 23 refers to the range covered by the cutting teeth 233 after one revolution, and the working ranges of the blades 232 of two adjacent scrapping knives 23 overlap each other in the axial direction of the cutter shaft 231, that is, The cutting tooth 233 of a scrap knife 23 can stretch into the gap between the adjacent blades 232 on another scrap knife 23, and the gap between the adjacent blades 232 is slightly larger than the thickness of the blade 232. In this way, after the recycled plastic is cut, the particle size is controlled by the distance between adjacent blades 232 .

The working surface of the cutting tooth 233 is formed by the intersection of the first tooth flank 2331 and the second tooth flank 2332. The extension length of the first tooth flank 2331 is less than the extension length of the second tooth flank 2332. 2331, the tangential direction and the normal direction at the intersection of the second tooth side surface 2332 form an acute angle angle, each cutting groove 234 is connected with a cutting tooth 233 respectively, and on the same cutting tooth 233, the first tooth side surface 2331 forms a connection The second tooth flank 2332 transitions to the next cutting groove 234 , and the direction of the connected cutting groove 234 is the same as that of the cutting tooth 233 . The orientation of the cutting teeth 233 can refer to the direction of the angle bisector of the angle formed between the first tooth flank 2331 and the second tooth flank 2332, which is shown by the dashed arrow X1 in FIG. The direction of the dotted arrow X2 in Fig. 5, X2 may be parallel to X1, or there may be a small angle within a certain range. The tangential direction and the normal direction of the intersection of the first tooth flank 2331 and the second tooth flank 2332 are perpendicular to each other, the normal direction of the intersection of the first tooth flank 2331 and the second tooth flank 2332 is the radial direction, the first tooth flank 2331, the second The tangential direction of the intersection of the tooth flanks 2332 is the dotted arrow X3 in Figure 5, the normal direction of the intersection of the first tooth flank 2331 and the second tooth flank 2332 is the dotted arrow X4 in Figure 5, and the angle between X1 and X3 is θ1 , the included angle between X1 and X4 is θ2, and θ1 and θ2 are both acute angles, so that the orientation of the cutting teeth 233 falls on the first quadrant of the coordinate system formed by X3 and X4, and in the crushing process, the cutting teeth 233 can produce Sufficient component force will squeeze the recycled plastic downwards, and at the same time, enough component force can be produced to work together with the blade 232 on the other scrap knife 23 to clamp the recycled plastic to prevent the recycled plastic from returning. In this embodiment, the number of cutting teeth 233 on one blade 232 is six, and the orientation of each cutting tooth 233 is not the same. The orientations of the plastics are almost the same, so that the cutting teeth 233 are more stable and reduce the vibration.

In this embodiment, the cutting groove 234 includes a first groove side surface 2341, a groove bottom surface 2342 and a second groove side surface 2343, the first groove side surface 2341, the groove bottom surface 2342 and the second groove side surface 2343 are sequentially connected, and the cutting groove 234 is connected The first tooth side 2331 on the cutting tooth 233 forms the second groove side 2343, and the second tooth side 2332 of the last cutting tooth 233 is connected with the first groove side 2341 of the cutting groove 234 through the first transition surface 2334, and the first groove side 2341 and the first tooth flank 2331 are both planes, and the acute angle α is formed between the first groove flank 2341 and the first tooth flank 2331 and the width of the slot opening of the cutting groove 234 is greater than the width of the groove bottom. The first transition surface 2334 can be a plane or an arc surface. The opening width of the cutting groove 234 is greater than the width of the bottom of the groove, which is beneficial for the recycled plastic to be squeezed into the cutting groove 234 . As can be seen in Fig. 5, during the crushing process, the two crushing knives 23 rotate in the direction shown by the solid arrow, and the cutting teeth 233 on the blade 232 of the crushing knife 23 on the right side are similar to hooks to move the recycled plastic to Squeeze down, and cut a part of the recovered plastic into the cutting groove 234, the scrap knife 23 continues to rotate, as shown in Figure 6, the cutting groove 234 on the two scrap knives 23 shrinks and squeezes, and the right side The cutting teeth 233 on the scrap knife 23 extend into the gap between the two blades 232 of the scrap knife 23 on the left side, and the reclaimed plastics are pulverized by using this dislocation relationship. The scraper knife 23 on the left side mainly guides the feeding and discharging of the scraper knife 23 on the right side, and the scraper knife 23 on the left side utilizes the first groove side 2341 of the cutting groove 234 to crush the plastic Press down to avoid splashing.

The blade 232 is provided with a central hole 2321, and the central hole 2321 is provided with a plurality of key grooves 2322, and the cutter shaft 231 is provided with splines matched with the key grooves 2322, the number of the key grooves 2322 is M, and the number of the cutting teeth 233 is N, M and N All are positive integers, M≠N, the least common multiple of M and N is greater than M and N, in the present embodiment, M=8, N=6, so when assembling blade 232, when installing the last blade 232, relatively The preceding blade 232 rotates the included angle of the adjacent key grooves 2322, that is, rotates by 45°. The values of M and N can be determined according to actual needs. Through this design, the blade 232 can be conveniently installed in a spiral manner in the process of assembling the blade 232 . In addition to assembling, the blade 232 and the cutter shaft 231 can also be integrally formed.

The crushed material support 21 is also provided with a sieve back chamber 202, the sieve back chamber 202 is separated from the crushing chamber 201 by a sieve plate 24, the sieve back chamber 202 is located below the crushing chamber 201, and the sieve plate 24 is provided with a connection between the crushing chamber 201 and the sieve chamber. The filter hole 241 of the rear chamber 202, the bottom of the screen rear chamber 202 is provided with a discharge port 203, and the crushing chamber communicates with the melt extrusion assembly through the discharge port. In this embodiment, the discharge port is connected to the feed chamber through a connecting pipe. The first connection port is connected. The sieve plate 24 can screen the pulverized plastic, so that the uniformly pulverized plastic enters the cavity 202 behind the screen, improving the efficiency and effect of the subsequent melt extrusion work. In order to transport the pulverized plastic quickly, the circulation area at the upper end of the back-screen chamber 202 is larger than the circulation area at the outlet 203 .

In this embodiment, the scrap support 21 includes an upper frame body 211, a lower frame body 212 and a material guide groove 213. The upper frame body 211 is connected with the lower frame body 212 to form a bearing seat for positioning the cutter shaft 231. The upper frame body and the lower frame body form a In the crushing chamber, the feeding port 2011 is located on the top of the upper frame body 211, the sieve plate 24 is fixed on the bottom end surface of the lower frame body 212, the top of the feed chute 213 is pressed on the sieve plate 24, and the back chamber of the screen is located in the feed chute. After using for a certain period of time, the scrap knife 23 and the scrap support 21 can be disassembled and cleaned. In order to facilitate disassembly, the scrap support 21 also includes a fixing seat 26. The screws are fixed together on the fixing base 26 , the fixing base 26 is fixedly connected with the main frame 100 , and the debris support 21 is fixed on the main frame 100 through the fixing base 26 .

In addition, the crushing material support 21 also includes a mounting frame 27, the mounting frame 27 is connected and fixed with the upper frame body 211 and the lower frame body 212, the crushing material motor 25 is fixed on the mounting frame 27, and the crushing material motor 25 drives one of them through the shaft coupling 251. A cutter shaft 231 is provided with a transmission gear 235 on the cutter shaft 231, and the transmission gears 235 on two adjacent crushing knives 23 mesh, and the installation frame 27 is provided with a mounting groove 271 for accommodating the transmission gear 235. Since the crushing chamber 201 and the rear chamber 202 only need to be separated to clean the two chambers, the upper frame body 211 and the lower frame body 212 do not need to be separated, which is more convenient for disassembly and assembly. If it is necessary to clean the scrap knife 23, only the installation frame 27 needs to be removed, which is also very convenient. The mounting groove 271 can make the structure more compact, and is also convenient for adding and storing lubricating grease.

Next, look at melt extrusion assembly 300 in conjunction with FIGS. 8 and 9 .

The melting extrusion assembly 300 also includes a feeding chamber 31, a feeding motor 32, a feeding cylinder 33 and a feeding screw 34, the feeding chamber 31 communicates with the crushed material assembly 200, and the feeding screw 34 is located in the feeding cylinder 33 and is driven by the feeding motor 32 Rotate, the upstream end of the feeding cylinder 33 communicates with the feed chamber 31, the downstream end of the feeding cylinder 33 is provided with a heat insulating member 35, the heat insulating member 35 is provided with a heat insulating channel 351, and the downstream end of the feeding cylinder 33 passes through the heat insulating channel 351 Connected with hot melt cavity. The heat-insulating member 35 is used to separate the feeding cylinder 33 from the hot-melt chamber, reduce the influence of the heat of the hot-melt chamber on the feeding cylinder 33, avoid the plastic in the feeding cylinder 33 from melting in advance, and prevent the feeding cylinder 33 from being blocked after cooling. In this case, when the hot melt chamber starts to work again, it is not necessary to melt the blocked plastic in the feed cylinder 33 by preheating, so there is no need to increase the preheating time to improve the melt extrusion efficiency. The upstream end of the feeding cylinder 33 is supported and fixed by the first bracket 331 , the downstream end of the feeding cylinder 33 is supported and fixed by the second bracket 332 , and the heat insulating element 35 can be fixed on the second bracket 332 . The feeding motor 32 can drive the feeding screw 34 through gear transmission.

The feed chamber 31 is provided with a first feed port 311 communicated with the scrap assembly 200 and a second feed port 312 for inputting unused plastic raw materials, the first feed port 311 is located at the bottom of the feed chamber 31 Sideways, the second feeding port 312 is located at the upstream end of the feeding chamber 31 . It is also possible to only provide the first feeding port 311 . Unused plastic raw materials generally refer to newly purchased raw materials, and a feeding pipe 313 and a feeding hopper 314 can be provided on the second feeding port 312 .

In this embodiment, the heat insulating member 35 can be made of heat insulating material, such as polyether ether ketone, etc., and the heat insulating channel 351 is provided through the heat insulating block. The heat insulating part can adopt a block structure with a large thickness, and the formed heat insulation channel 351 has a certain length, which has a good heat insulation effect, and the block structure is easy to produce and easy to install.

In this embodiment, a first heating element 361 is fixed on the heat insulating element 35, and the hot-melt cavity includes a first cavity 301 that runs through the first heating element. The first heating element 361 is provided with a heating tube or a heating wire, and the hot-melt cavity Generally, it is set in a circular shape, which is beneficial to the uniform heating of the plastic entering the hot-melt cavity and improves the melting efficiency.

In order to improve the hot-melt effect, the downstream end of the first heating element 361 is also provided with a second heating element 362, and the hot-melt cavity includes a second cavity located in the second heating element 362, the second cavity communicates with the first cavity, and squeezes The outlet nozzle 38 is arranged at the downstream end of the second heating element 362, and the second heating element 362 is also provided with a heating pipe or a heating wire, which is equivalent to forming a hot-melt area with a higher temperature in the second cavity to ensure that the plastic is in the second cavity. in a fluid state. Both the first heating element 361 and the second heating element 362 can be provided with temperature sensors to monitor the temperature. At the same time, since the first cavity and the second cavity form two hot-melt areas, more plastic can be melted at a time, which is conducive to the increase of plastic extrusion rate, and can produce more plastic threads in the same time. Meet the needs of direct input into 3D printer printing and consumables production and storage. The first heating element 361 and the second heating element 362 control the heating temperature separately, which can realize accurate temperature control in sections. The plastic passes through the feeding cylinder, the heat insulation channel, the first cavity and the second cavity in sequence, and the temperature gradually rises in an orderly manner, which is conducive to Reduce plastic air bubbles and improve the quality of plastic threads. The extrusion nozzle 38 is located on the lateral side of the second chamber, and the extrusion nozzle 38 can be detachably connected with the second heating member 362, such as threaded connection, so that the extrusion nozzle 38 of different calibers can be easily replaced, and different diameters can be extruded. plastic wire. A wire diameter sensor for detecting the diameter of the plastic wire can be installed on the extrusion nozzle 38, which is convenient for accurately controlling the diameter of the plastic wire, and can also feedback the adjustment result of the diameter of the plastic wire in time.

After plastic line is extruded, can utilize cooling fan 39 to cool down, avoid being subjected to self-weight sagging.

Next, look at the cable assembly 400 in conjunction with FIGS. 10 to 12 .

The reel assembly 400 includes a reel motor 41 and a reel 42, the connection base 101 is slidably connected with a reel support 43, the reel motor 41 is fixed on the reel support 43, and the reel 42 is rotatably connected to the reel support 43 And it is detachably connected with the coil support 43 , the coil motor 41 drives the coil 42 to rotate, and the coil 42 is higher than the extrusion nozzle 38 . Wire reel motor 41 and wire reel 42 are all contained on the wire reel support 43 to form a whole, convenient integral dismounting. The wire reel 42 is detachable, easy to replace the wire reel 42, the wire reel 42 is higher than the extrusion nozzle 38, that is, the plastic wire is wound up obliquely, so that the plastic wire is affected by its own gravity and can have a certain tension during the winding process , which is conducive to improving the quality of winding.

The connection base 101 is provided with a translation motor 44 that drives the wire reel bracket 43 to reciprocate relative to the connection base 101 along the axial direction of the wire reel 42. The diameter of the plastic wire is D, and the translation motor 44 drives the wire reel 42 after one rotation 43 moves a distance D relative to the connecting base 101 . Driven by the translation motor 44, the rotation of the wire reel 42 is synchronized with the translation, and the distance of the translation of the wire reel 42 is controlled according to the diameter of the plastic wire. The wire reel 42 has just moved the distance D, so that the plastic wire can be spirally wound on the wire reel 42, so that the next circle of plastic wire is close to the previous circle of plastic wire to continue winding, and will not appear in the same position in the middle of the wire reel 42 In the case of continuous winding of two turns of the plastic thread, the reel 42 moves back and forth under the drive of the translation motor 44. After the upper layer is wound, the reel 42 changes the direction of translation, and the plastic thread continues to be wound on the original plastic thread. Perform spiral winding to make the plastic wire winding smooth and orderly without uneven density and improve the winding quality. Since the moving speed of the translation motor 44 is only related to the rotation speed of the wire reel 42, it will not be affected by the plastic wire winding process. The increase of the middle circumference affects the winding quality.

The output shaft of the translation motor 44 is provided with a transmission screw 45, and the coil wire support 43 is provided with a translation nut 46 cooperating with the transmission screw 45, and the translation motor 44 drives the transmission screw 45 to rotate so that the translation nut 46 translates, thereby driving the disk. The wire support 43 translates relative to the connection base 101 . The transmission screw 45 cooperates with the translation nut 46, the transmission is stable, and the precision is easy to control, and the translation distance can be adjusted by controlling the rotational speed. Because the wire coil support 43 is slidingly connected on the connection base 101, the coil wire motor 41 and the wire coil 42 are all located on the coil wire support 43, so in order to allow the coil wire support 43 to be detachable, the translation nut 46 moves to the transmission screw rod 45 The end can be separated from the drive screw mandrel 45. In this way, the coil motor 41 and the coil 42 can be disassembled together with the coil support 43 , and the modularization of the coil support 43 , the coil motor 41 and the coil 42 can be realized.

In this embodiment, the wire coil support 43 includes a first base plate 431 and a side plate 432, the first base plate 431 is slidably connected with the connection base 101, the side plate 432 is erected on the first base plate 431, the wire coil motor 41 and the wire coil 42 is connected on the side plate 432, and the reel motor 41 and the reel 42 are located on both sides of the side plate 432 respectively. Side plate 432 only needs to be provided with one, so the structure is simple, easy to produce and assemble, and coil wire motor 41 and wire coil 42 are positioned at the both sides of side plate 432, the moment of gravity of the gravity of coil motor 41 relative side plate 432 can be compared with wire coil The moment offset of the gravity of the relative side plate 432 of 42 is partially or fully offset, so that the reel 42 can be more stable when rotating. Specifically, the wire reel 42 includes a disc body 421 and a disc shaft 422, the disc body 421 is sleeved on the disc shaft 422 and is limited in the circumferential direction, that is, the disc body 421 and the disc shaft 422 rotate synchronously, and the disc shaft 422 is installed on the side plate 432 One end of the disk shaft 422 is in transmission connection with the output shaft of the wire winding motor 41 , and the other end of the disk shaft 422 is provided with a limiting member 423 for preventing the disk body 421 from falling out. The limiting member 423 is detachably connected to the disk shaft 422, so that the wire disk 42 can be quickly disassembled. In order to facilitate the assembly of the winding motor 41 , the side plate 432 is provided with a bearing seat 433 , the disk shaft 422 is connected to the bearing seat 433 through a bearing, and the winding motor 41 is mounted on the bearing seat 433 .

A sliding groove 4311 is formed on the lower surface of the first bottom plate 431 , and a sliding rail 1011 matching the sliding groove 4311 is disposed on the connecting base 101 . In this embodiment, the lower surface of the first bottom plate 431 is provided with a slider 434, the chute 4311 is arranged on the slider 434, the slider 434 and the slide rail 1011 can be separated, and the connection between the cable support 43 and the Assembly and disassembly of the base 101.

The overall structure of this embodiment can also be understood with reference to FIG. 13 . Due to the angle problem, in order to show the extrusion nozzle 38 , the extrusion nozzle 38 is separated from the second heating element 362 .

Embodiment two:

In order to improve the heat insulation effect, this embodiment adds a cooling element on the basis of Embodiment 1, specifically as shown in Figure 14 and Figure 15, a cooling element 37 is provided between the heat insulating element 35 and the downstream end of the feeding cylinder 33, cooling Part 37 is provided with cooling pipe 371, and cooling pipe 371 communicates with water pump 372, water tank 373 to form a cooling cycle. , the cooling passage 370, the heat insulation passage 351 and the hot melt cavity are connected in sequence. Because the cooling element 37 adopts the mode of circulating cooling, the cooling effect is relatively good, and the melting of the plastic in the feeding cylinder 33 can be avoided better. , the temperature gradually increases in an orderly manner, and the plastic can gradually change from preheating to melting, which can reduce the generation of air bubbles and improve the quality of the extruded plastic line.

In this embodiment, since the cooling element 37 and the first heating element are connected through the heat insulating element 35, the cooling element 37 will not affect the normal heating of the first heating element, and the heat insulating element 35 has a certain temperature, and the plastic is in the insulation. The hot tunnel can be preheated, but it will not reach melting temperature.

Refer to Embodiment 1 for other content not described.

Embodiment three:

On the basis of Embodiment 1 or Embodiment 2, in order to realize the recycling of plastics for 3D printing, there are many different processing methods, and the recycling device may also include a cooling traction assembly for transporting the plastic line to the 3D printer for printing, Either one of the cable coil assembly and the cooling traction assembly is detachably connected to the connection base. The cable coil assembly and the cooling traction assembly are set as replaceable modules, and the user can install the coil assembly or the cooling traction assembly according to the needs, and using the connection base, the two replaceable modules of the coil assembly and the cooling traction assembly can It is installed on the main frame with a unified structure, which facilitates the replacement and assembly of the two modules.

As shown in Figures 16 to 17, the cooling traction assembly 500 includes a support base 51 and a conveyor 52 arranged on the support base 51, the support base 51 is detachably connected to the connection base 101, and the conveyor 52 has a wire passage for squeezing The outlet nozzle 38 is located on the same straight line as the wire passage.

Conveyor 52 comprises conveying seat 521, conveying driving wheel 522, conveying driven wheel 523 and conveying motor 524, the output shaft of conveying motor 524 passes conveying seat 521, and conveying driving wheel 522 can be directly installed on the output shaft of conveying motor 524, The conveying motor 524 drives the conveying driving wheel 522, and the conveying driven wheel 523 is rotatably connected to the conveying seat 521. A conveying gap is formed between the conveying driving wheel 522 and the conveying driven wheel 523. The conveying seat 521 is provided with an inlet 5211 and an outlet. 5212, the feed port 5211, the discharge port 5212 and the conveying gap form a line passage. The conveying seat 521 is provided with accommodating groove 5213 for accommodating the conveying driving wheel 522 and the conveying driven wheel 523. The conveying driving wheel 522 can adopt gears, which can generate axial tension on the plastic wire when rotating, and output the plastic wire. The conveying motor 524 is fixed on the support base plate 51, the conveying seat 521 is fixed on the conveying motor 524, and the conveying motor 524 can be a servo motor.

In order for the conveyor 52 to transport plastic wires of different diameters, the conveyor 52 is provided with an adjustment driver 55 to adjust the size of the conveying gap. For this reason, the conveying driven wheel 523 is rotatably connected to the sliding frame 56, and the sliding frame 56 is slidably arranged in the accommodating In the groove 5213, the adjusting driver 55 is fixed on the conveying seat 521, the output end of the adjusting driver 55 is connected with the sliding frame 56, and the adjusting driver 55 drives the sliding frame 56 to slide in the accommodating groove 5213 to adjust the conveying driven wheel 523 to the conveying driving wheel 522 The spacing, that is, to adjust the size of the conveying gap.

A guide roller 53 and a heat sink 54 are provided on the supporting bottom plate 521 between the conveyor 522 and the extrusion nozzle 38 . The heat sink 54 may adopt a fan.

For other content not described, refer to Embodiment 1 and Embodiment 2.

In addition to the above-mentioned preferred embodiment, the utility model also has other embodiments, and those skilled in the art can make various changes and deformations according to the utility model, as long as they do not depart from the spirit of the utility model, all should belong to the claims of the utility model The range defined in .

Claims (19)

1. a kind of retracting device of small-sized 3D printing plastics, it is characterised in that including mainframe and on mainframe Particle component, melting extrusion component and disk line component, particle component are used to crush the plastics reclaimed and are delivered to melting extrusion group Part, melting extrusion component is used to the plastic molten melt after crushing being extruded into plastic cord, and disk line component is used to wind plastic cord, Melting extrusion component includes hot melt chamber and extrusion nozzle, and extrusion nozzle is located at hot melt located at the downstream of hot melt chamber, disk line component The horizontal side of chamber, extrusion nozzle is towards disk line component.

2. retracting device according to claim 1, it is characterised in that the melting extrusion component also includes feed cavity, sent Expect motor, feed cylinder and feeding spiro rod, feed cavity is connected with particle component, feeding spiro rod is located in feed cylinder and by feeding motor Rotation is driven, the upstream end of feed cylinder is connected with feed cavity, the downstream of feed cylinder is provided with thermal insulation barriers, and thermal insulation barriers are provided with heat-insulated logical Road, the downstream of feed cylinder is connected by heat insulation path with hot melt chamber.

3. retracting device according to claim 2, it is characterised in that set between the downstream of the thermal insulation barriers and feed cylinder There is cooling piece, cooling piece is provided with cooling tube, and cooling tube connects to form cooling circulation with water pump, water tank, and thermal insulation barriers pass through cooling piece It is connected with feed cylinder, cooling piece is provided with cooling duct, and downstream, cooling duct, heat insulation path and the hot melt chamber of feed cylinder are successively Connection.

4. retracting device according to claim 2, it is characterised in that the first heating member is fixed with the thermal insulation barriers, heat Molten chamber includes the first chamber set through the first heating member, and the first chamber is connected with heat insulation path.

5. retracting device according to claim 4, it is characterised in that the downstream of first heating member is additionally provided with second Heating member, hot melt chamber includes the second chamber in the second heating member, and the second chamber is connected with the first chamber, and extrusion nozzle is located at second The downstream of heating member is simultaneously connected with the second chamber.

6. retracting device according to claim 2, it is characterised in that the feed cavity is provided with the connected with particle component One charging aperture and for inputting the second charging aperture without used plastic raw materials, first charging aperture is located at the side of feed cavity Face, second charging aperture is located at the upstream end of feed cavity.

7. retracting device according to claim 1, it is characterised in that the disk line component includes disk line motor and drum, Disk line bracket is slidably connected on connection pedestal, disk line motor is fixed on disk line bracket, and drum is rotatably connected on disk line bracket Go up and be detachably connected with disk line bracket, disk line motor belt motor moving-wire disc spins, drum is higher than extrusion nozzle.

8. the retracting device stated according to claim 7, it is characterised in that the connection pedestal is provided with along band Moving plate line bracket The translation motor of the axially opposing connection pedestal alternating translational of disk, a diameter of D of plastic cord, translation motor is spiraled circle online Band Moving plate line bracket is relative afterwards connects pedestal displacement D.

9. retracting device according to claim 8, it is characterised in that the output shaft of the translation motor is provided with driving wire Bar, disk line bracket is provided with the translational nut coordinated with drive lead screw, and translation motor drives drive lead screw rotation to make translational nut Translation, so that with the relative connection pedestal translation of Moving plate line bracket, the end that translational nut moves to drive lead screw can be with driving wire Bar is separated.

10. retracting device according to claim 7, it is characterised in that the disk line bracket detachably connects with being connected pedestal Connect, retracting device also includes being used to plastic cord being delivered to the cooling traction component that 3D printer is printed, disk line component with Cooling traction component is selected one and is detachably connected with being connected pedestal.

11. retracting device according to claim 10, it is characterised in that the cooling traction component include support baseboard and The conveyer on support baseboard is located at, support baseboard is detachably connected with being connected pedestal, conveyer has passing channel, extrusion spray Mouth is located along the same line with passing channel.

12. retracting device according to claim 11, it is characterised in that be located at conveyer and extrusion on the support baseboard Guide reel and radiator are provided between nozzle.

13. according to any described retracting device of claim 1 to 12, it is characterised in that the particle component includes particle branch Frame, particle motor and particle knife, particle support are fixed on mainframe, and particle support is provided with crushing chamber, and crushing chamber is provided with spout, Crushing chamber is connected with melting extrusion component, and particle knife is installed in crushing chamber, and particle motor drives the work of particle knife, particle knife bag Include cutter shaft and blade, axially spaced-apart of the blade along cutter shaft is arranged with multiple, and blade has cutting teeth, circumference of the cutting teeth along blade It is intervally distributed with multiple, in the circumference of same blade, cutting groove is formed between adjacent cutting teeth, in the axial direction of cutter shaft, phase Offset angular setting makes cutting teeth misplace to adjacent two blades in the circumferential, and particle knife is parallel to be provided with least two, and adjacent two broken Expect that the working range of the blade of knife is overlapped in the axial direction of cutter shaft, the direction of rotation of adjacent two particle knives is opposite.

14. retracting device according to claim 13, it is characterised in that the working face of the cutting teeth is by the first flank Face, the second flank are crossed to form, and the development length of the first flank is less than the development length of the second flank, the court of cutting teeth To acute angle is formed between normal direction with the first flank, the tangential of the second flank intersection respectively, each cutting groove divides It is not connected with a cutting teeth, on same cutting teeth, the first flank forms the groove side of connected cutting groove, the Two flank transition extend to next cutting groove, and the direction of connected cutting groove is identical with the direction of cutting teeth.

15. retracting device according to claim 14, it is characterised in that the cutting groove includes the first groove side, bottom land Face and the second groove side, the first groove side, groove bottom and the second groove side are sequentially connected, on the cutting teeth being connected with cutting groove First flank the second groove of formation side, the second flank of a upper cutting teeth pass through First Transition face and cutting groove first Groove side is connected, and the first groove side and the first flank are plane, and acute angle is formed between the first groove side and the first flank Angle α and make cutting groove width of rebate be more than slot bottom width.

16. retracting device according to claim 13, it is characterised in that the particle support is additionally provided with after sieve back cavity, sieve Chamber is separated by sieve plate with crushing chamber, and sieve back cavity is located at the filter that crushing chamber and sieve back cavity are communicated with the lower section of crushing chamber, sieve plate Hole, the bottom of sieve back cavity is provided with discharging opening, and crushing chamber is connected by discharging opening with melting extrusion component.

17. retracting device according to claim 16, it is characterised in that the particle support includes upper frame, lower frame And deflector chute, upper frame is connected the bearing block to form positioning cutter shaft with lower frame, and upper frame and lower frame surround crushing chamber, feeding Mouth is located at the top of upper frame, and sieve plate is fixed on the bottom face of lower frame, and the top of deflector chute is pressed on sieve plate, sieve back cavity position In in deflector chute.

18. retracting device according to claim 17, it is characterised in that the particle support also includes fixed seat, restocking Body, lower frame and deflector chute are fixed in fixed seat together by long spiro nail, and particle support is fixed on mainframe by fixed seat On.

19. retracting device according to claim 17, it is characterised in that the particle support also includes mounting bracket, is installed Frame is connected with upper frame, lower frame, and particle motor is fixed on mounting bracket, and cutter shaft is provided with travelling gear, adjacent two Mounting groove provided with accommodating travelling gear in travelling gear engagement on particle knife, mounting bracket.