A 3D printer for recycling waste plastics

Abstract

The present invention discloses a 3D printer for recycling waste plastics, comprising an upper shell, an intermediate shell and a lower shell, wherein a waste plastic classification unit is arranged in the upper shell, a re-crushing unit and a melting unit are arranged in the intermediate shell, and a multi-axis printing unit for 3D printing is arranged in the lower shell; the melting unit comprises a temperature sensor that can be quickly installed and disassembled. The present invention has the following advantages and effects: the waste plastic classification unit can improve efficiency, and there is no need to re-crush small-volume waste plastics, and the number of large-volume waste plastics crushed at a time is increased; the re-crushing unit can fully crush large-volume waste plastics, and the crushing effect is good; the melting unit can melt the waste plastics, and then transport them to the multi-axis printing unit for 3D printing; the temperature sensor has the advantages of fast and convenient installation and disassembly, which is convenient for regular maintenance of the temperature sensor.

Description

Technical Field

[0001] The invention relates to the field of plastic reshaping, and in particular to a 3D printer for recycling waste plastics. Background Art

[0002] Plastic itself is not a pollutant. The essence of plastic pollution is that plastic waste leaks into the soil, water and other natural environments and is difficult to degrade, causing visual pollution, soil damage, microplastics and other environmental hazards. Plastic pollution control is a global problem. Many plastic fragments and microplastics abandoned by humans that have not been indirectly collected are eaten, drunk, and even breathed by animals and humans, and eventually enter the tissues and organs of the human body.

[0003] With the development of social material and spiritual civilization, people's awareness of environmental protection and garbage classification has gradually increased, and the demand for plastic waste disposers has gradually increased, and better resource recycling and utilization is a new beginning in the market.

[0004] The principle of 3D printing is to use adhesive materials such as wax, powdered metal or plastic to bond and manufacture layer by layer. The most direct principle is to put the data and raw materials into the 3D printer, and the machine will build it layer by layer according to the program and product.

[0005] The current market lacks 3D printers that can recycle waste plastics and directly process waste plastics as raw materials. Therefore, it is necessary to develop a 3D printer for recycling waste plastics, which needs to have a structure for crushing and melting waste plastics; among which:

[0006] The rolling structure needs to improve rolling efficiency;

[0007] The molten structure requires the use of temperature sensors for real-time temperature monitoring. The temperature sensor must have a structure that is easy to install and disassemble so that the temperature sensor can be regularly maintained to increase its service life. Summary of the invention

[0008] The purpose of the present invention is to provide a 3D printer for recycling waste plastics to solve the problems raised in the background technology.

[0009] The above technical objectives of the present invention are achieved through the following technical solutions:

[0010] A 3D printer for recycling waste plastics, comprising an upper shell, an intermediate shell and a lower shell stacked in sequence from top to bottom, wherein a waste plastic classification unit is arranged in the upper shell, a re-crushing unit and a melting unit are arranged in the intermediate shell, and a multi-axis printing unit for 3D printing is arranged in the lower shell;

[0011] The waste plastic classification unit is used to place waste plastics and classify the waste plastics, so that small-volume waste plastics are directly sent to the melting unit and large-volume waste plastics are sent to the re-crushing unit; the output end of the re-crushing unit is connected to the melting unit, and the output end of the melting unit is connected to the multi-axis printing unit;

[0012] The melting unit comprises a temperature measuring sensor which can be quickly installed and disassembled.

[0013] The further configuration is that: the waste plastic classification unit includes a receiving base fixed in the upper shell body, the receiving base is tilted, and side baffles are fixedly arranged on the inner and outer sides of the receiving base; the receiving base is sequentially provided with a first sleeve ring and a second sleeve ring along its own tilt direction from high to low, and the first sleeve ring and the second sleeve ring are respectively provided with a plurality of regular first filter holes and second filter holes, the first filter holes and the second filter holes are both square, and the aperture of the first filter hole is smaller than that of the second filter hole.

[0014] Further configuration is: the melting unit comprises a melting inner shell fixed in the intermediate shell, the upper end of the melting inner shell is fixedly provided with a vertical lower guide, the lower guide is located below the first sleeve ring, and is used to receive a small volume of waste plastic falling from the first sleeve ring;

[0015] The re-crushing unit includes a vertical crushing inner shell, an expansion block is fixedly arranged on the upper end of the crushing inner shell, the upper end width of the expansion block is greater than the lower end, the expansion block is located below the second sleeve ring, and is used to receive a large volume of waste plastics falling from the second sleeve ring; a horizontal crushing assembly is rotatably arranged inside the crushing inner shell, a servo motor is fixedly arranged on the right end of the crushing inner shell, the output shaft of the servo motor is fixed to the crushing assembly, and provides rotational power for the crushing assembly.

[0016] Further configuration is: the crushing assembly includes a rotating shaft, on which a plurality of fixed discs are arranged at intervals; the front end surface of each fixed disc is fixed with three front end crushing arms by bolts, and the distances between adjacent front end crushing arms are consistent; the rear end surface of each fixed disc is fixed with three rear end crushing arms, and the distances between adjacent rear end crushing arms are consistent;

[0017] The front end surface of the fixed disc is provided with three front end positioning areas, and the front end positioning area is located at the central position between two adjacent front end crushing arms; the back side of the fixed disc is provided with three rear end positioning areas corresponding to the positions of the three front end positioning areas, and the three rear end crushing arms are respectively fixed at the three rear end positioning areas by bolts.

[0018] A further configuration is that the fixed disc rotates counterclockwise, and the side where each of the front end crushing arm and the rear end crushing arm rotates counterclockwise is a contact section, the contact section is inclined, and a plurality of sharp cuts are provided on the contact section.

[0019] Further configuration is: a plurality of electric heating tubes are fixedly arranged at the bottom of the molten inner shell, and the electric heating tubes are arranged side by side; a transverse heat conducting plate is fixedly arranged inside the molten inner shell, the heat conducting plate is located above the electric heating tube, and the heat conducting plate is inclined; an inner hole connected to the lower part of the heat conducting plate is opened in the left wall of the molten inner shell, and an electromagnetic valve is fixedly arranged on the outer side of the inner hole, and the electromagnetic valve is connected to the multi-axis printing unit through an external pipe;

[0020] The right outer wall of the melting inner shell is fixedly provided with a limit main seat, and the limit main seat and the melting inner shell are respectively provided with a first through hole and a second through hole that are in communication, and the aperture of the second through hole is smaller than the first through hole; the temperature sensor comprises an extension section and a temperature measuring section that can be respectively extended into the first through hole and the second through hole; the limit main seat is provided with a plurality of first sealing rings that can be connected with the extension section that is extended into the first through hole; the melting inner shell is provided with a plurality of second sealing rings that can be connected with the temperature measuring section that is extended into the second through hole;

[0021] An automated internal pressure assembly is disposed in the limit main seat. When the extension section extends into the first through hole and abuts against the wall of the molten inner shell, the temperature measuring section will extend into the interior of the molten inner shell, and the automated internal pressure assembly will press and secure the extension section in the first through hole.

[0022] Further configuration is: an inner groove is provided in the limit main seat, the automated internal pressure assembly includes an inner fixing seat fixed in the inner groove, the inner part of the inner fixing seat is hollow, the top of the inner fixing seat is open and communicated with the first through hole; an execution block, an intermediate connecting block and a force-bearing block are arranged inside the inner fixing seat, the execution block is located at the upper end of the intermediate connecting block, and a first embedded block extending into the interior of the intermediate connecting block is fixedly arranged at the lower end of the execution block; the force-bearing block is located at the lower end of the intermediate connecting block, and a second embedded block extending into the interior of the intermediate connecting block is fixedly arranged at the upper end of the force-bearing block, and the first embedded block, the second embedded block and the intermediate connecting block are fixed by transverse locking screws;

[0023] Side blocks are fixedly arranged on both sides of the inner bottom of the inner fixed seat, a force-driven cavity is formed between the two side blocks, the force-bearing block extends downward into the force-driven cavity, a compression spring located in the force-driven cavity is compressed and arranged between the bottom of the inner fixed seat and the force-bearing block, and the compression spring can push the execution pressing block to move upward; an inner pressure groove is opened at the lower end of the extension section, and the execution pressing block can be pressed into the inner pressure groove to achieve the purpose of fixing the temperature measuring sensor;

[0024] There is a space between the two side blocks and the middle connecting block for the middle connecting block to move; and when the two side blocks and the middle connecting block are against each other, there is a space between the force-bearing block and the bottom of the inner fixing seat to prevent the compression spring from being crushed.

[0025] Further configuration is: a follower block is fixedly arranged on the upper end of the intermediate connecting block, the left end of the follower block is in contact with the left inner wall of the inner fixed seat, and the right end is in contact with the execution pressure block; a stopping block is fixedly arranged on the top of the inner fixed seat, and the stopping block can stop the following block from moving after colliding with the following block; the stopping block and the following block are both provided with recessed surfaces on the side facing each other, a recessed cavity is formed between the two recessed surfaces, and the recessed cavity is located in the left half of the stopping block and the following block; a first opening connected to the recessed cavity is provided in the inner fixed seat, a second opening connected to the first opening is provided in the limiting main seat, and the second opening extends to the right end wall of the limiting main seat and is fixedly provided with an interface.

[0026] Further configuration is: a first conductive block and a second conductive block are fixedly provided with a gap at the upper end of the execution pressing block; a first wire hole connected to the first conductive block is provided in the execution pressing block, the first embedded block and the force-bearing block; a second wire hole connected to the second conductive block is provided in the execution pressing block, the second embedded block and the force-bearing block; both the first wire hole and the second wire hole are connected to the force-bearing driving cavity; a wire outlet hole extending to the right end wall is provided in the limit main seat; a bottom hole connecting the force-bearing driving cavity with the wire outlet hole is provided at the bottom of the inner fixed seat;

[0027] A conductive layer is fixedly arranged at the bottom of the inner pressure groove. When the execution pressing block is pressed into the inner pressure groove, the first conductive block and the second conductive block form a passage through the conductive layer.

[0028] Further configuration is: the multi-axis printing unit includes a support base fixed to the bottom of the lower shell body, the left and right ends of the support base are fixedly provided with vertical arms, and the upper ends of the two vertical arms are fixed with top covers; two driving shafts are arranged between the support base and the top cover, a movable panel is slidably arranged on the two driving shafts, a first motor for providing power to the two driving shafts is arranged on the top cover, the movable panel is provided with threaded holes for the two driving shafts to pass through, and the outer peripheries of the two driving shafts are provided with external threads that are threadedly matched with the corresponding threaded holes; two first guide rails are arranged on the movable panel, a movable block is slidably arranged on the two first guide rails, a first guide belt passing through the movable block is arranged on the movable panel, and the first guide belt is driven by a second motor; a printing nozzle is arranged on the movable block, and the outer tube is connected to the printing nozzle;

[0029] The support seat is provided with two second guide rails, a bearing panel is slidably provided on the two second guide rails, the support seat is provided with a second guide belt passing through the bearing panel, and the second guide belt is driven by a third motor.

[0030] The beneficial effects of the present invention are:

[0031] 1. In the present invention, the waste plastic classification unit can classify the waste plastics, so that small-volume waste plastics are directly sent to the melting unit and large-volume waste plastics are sent to the re-crushing unit; this can improve efficiency, and there is no need to re-crush small-volume waste plastics, and increase the number of large-volume waste plastics crushed at a single time; the re-crushing unit can fully crush large-volume waste plastics, and the crushing effect is good; the melting unit can melt the waste plastics, and then transport them to the multi-axis printing unit for printing operations; the temperature sensor has the advantages of fast and convenient installation and disassembly, which is convenient for regular maintenance of the temperature sensor.

[0032] 2. In the present invention, the first sleeve ring and the second sleeve ring are arranged in sequence from high to low along the inclined direction of the receiving base, so that the large-volume and small-volume waste plastics will first pass through the first sleeve ring, and the small-volume waste plastics will fall into the first filter hole; and the remaining large-volume waste plastics will slide down to the second sleeve ring and then fall from the second filter hole.

[0033] 3. In the present invention, a small volume of waste plastics can be sent to the melting inner shell through the lower guide channel, a large volume of waste plastics can be sent to the crushing inner shell through the expansion block, and then the large volume of waste plastics is crushed again by the crushing assembly.

[0034] 4. In the present invention, multiple fixed discs arranged on the rotating shaft can rotate together to expand the contact range with small-volume waste plastics; the three front-end crushing arms and the three rear-end crushing arms can improve the crushing efficiency; the three rear-end crushing arms on the front fixed disc will cooperate with the three front-end crushing arms on the rear fixed disc to increase the crushing coverage area and crush as much small-volume waste plastics as possible.

[0035] 5. In the present invention, the contact sections on the front crushing arm and the rear crushing arm are inclined, so that small-volume waste plastics can fall into between adjacent front crushing arms or adjacent rear crushing arms, so that the incision can fully crush the small-volume waste plastics.

[0036] 6. In the present invention, the electric heating tube in the molten inner shell can achieve temperature increase, the heat conducting plate can perform heat conduction, and can also prevent the molten plastic from flowing into the electric heating tube; the outer tube can guide the molten plastic to the multi-axis printing unit; the limit main seat is provided for the installation of the temperature sensor, the extension section and the temperature measuring section of the temperature sensor can extend into the first through hole and the second through hole respectively, and the first sealing ring and the second sealing ring can improve the sealing of the molten inner shell. The automated internal pressure assembly can press and fix the extension section located in the first through hole, thereby fixing the temperature sensor.

[0037] 7. In the present invention, the actuator pressure block in the automated internal pressure assembly can be extended into the internal pressure groove under the thrust of the compression spring to achieve the purpose of fixing the temperature sensor; the intermediate connecting block can be abutted against the side block in advance to prevent the compression spring from being crushed; the force-bearing driving cavity between the two side blocks can be inserted into the force-bearing block to prevent the force-bearing block from lateral shaking and improve stability; the first insert block and the second insert block are provided to allow the locking screw to be inserted and locked, and the fixing of the actuator pressure block, the intermediate connecting block and the force-bearing block can be achieved by a locking screw.

[0038] 8. In the present invention, the stopping block and the following block are used for limiting the position by colliding with each other; a recessed cavity is formed on the side of the stopping block and the following block facing each other, and the first opening and the second opening can connect the recessed cavity and the interface, and air can be introduced through the interface. After the air enters the recessed cavity, it can push down the middle connecting block, thereby allowing the execution pressure block to be hidden inside the internal fixing seat to facilitate the installation and disassembly of the temperature sensor.

[0039] 9. In the present invention, if the temperature sensor is not installed, the high temperature in the molten inner shell will leak out from the first through hole and the second through hole, which poses a safety hazard; the molten plastic will also leak from the first through hole and the second through hole, which is unsafe. Therefore, it is necessary to set a feedback structure for detecting the temperature sensor after installation; the first conductive block can be grounded through a wire, the second conductive block is connected to a resistor through a wire and then connected to a 3V power supply, and the second conductive block is also connected to the enable pin of the controller through a wire for input detection; in the initial state, the first conductive block and the second conductive block are separated, and the circuit between the two is broken, and the enable pin of the controller detects a high level; when the execution pressure block is pressed into the inner pressure groove, the first conductive block and the second conductive block form a path through the conductive layer, and the second conductive block is grounded through the first conductive block, and the enable pin of the controller detects a low level; thus, the level state of the enable pin of the controller can be detected, and the controller can be connected to the PLC to realize the overall control.

[0040] 10. In the present invention, the print head can move in two axes, and the bearing panel can move in one axis, and three-axis 3D printing can be achieved through cooperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 Schematic diagram of the internal structure of the embodiment;

[0042] Figure 2 This is a schematic diagram of the structure of the crushing assembly in the embodiment;

[0043] Figure 3 for Figure 1 Enlarged view of part A in the middle;

[0044] Figure 4 for Figure 1 Enlarged view of middle part B;

[0045] Figure 5 Schematic diagram of the local structure of the multi-axis printing unit in the embodiment.

[0046] In the figure: 11, upper shell; 12, middle shell; 13, lower shell; 21, receiving base; 22, side baffle; 23, first sleeve ring; 231, first filter hole; 24, second sleeve ring; 241, second filter hole; 31, melting inner shell; 32, lower guide; 33, crushing inner shell; 34, expansion block; 35, servo motor; 36, rotating shaft; 37, fixed disc; 381, front end crushing arm; 382, rear crushing arm; 39, contact section; 391, incision; 41, electric heating tube; 42, heat conducting plate; 43, solenoid valve; 44, outer tube; 50, limit main seat; 51, first through hole; 52, second through hole; 60, temperature sensor; 61, extension section; 611, inner pressure groove; 612, conductive layer; 62, temperature measuring section; 631, first sealing ring; 632, second sealing ring; 64, inner fixing seat ; 65, execution block; 651, inclined plane; 66, intermediate connecting block; 67, force block; 681, first insert block; 682, second insert block; 71, side block; 72, force driving cavity; 73, compression spring; 81, follower block; 82, stop block; 83, recessed cavity; 84, first opening; 85, second opening; 851, interface; 861, first conductive block; 862, second conductive block; 871 , first wire hole; 872, second wire hole; 873, bottom hole; 874, wire outlet hole; 911, support seat; 912, vertical arm; 913, top cover; 92, drive shaft; 93, movable panel; 941, first guide rail; 942, first guide belt; 95, movable block; 951, print head; 961, second guide rail; 962, bearing panel; 963, second guide belt; 964, third motor. DETAILED DESCRIPTION

[0047] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0048] As attached Figures 1 to 5 As shown;

[0049] This embodiment discloses a 3D printer for recycling waste plastics, comprising an upper shell 11, an intermediate shell 12 and a lower shell 13 stacked in sequence from top to bottom, wherein a waste plastic classification unit is arranged in the upper shell 11, a re-crushing unit and a melting unit are arranged in the intermediate shell 12, and a multi-axis printing unit for 3D printing is arranged in the lower shell 13;

[0050] The waste plastic classification unit is used to place waste plastics and classify the waste plastics, so that small-volume waste plastics are directly sent to the melting unit and large-volume waste plastics are sent to the re-crushing unit; the output end of the re-crushing unit is connected to the melting unit, and the output end of the melting unit is connected to the multi-axis printing unit;

[0051] The melting unit includes a temperature sensor 60 which can be quickly installed and removed.

[0052] Among them, the waste plastic classification unit includes a receiving base 21 fixed in the upper shell 11, the receiving base 21 is tilted, and side baffles 22 are fixedly arranged on the inner and outer sides of the receiving base 21; the receiving base 21 is provided with a first sleeve ring 23 and a second sleeve ring 24 in sequence from high to low along its own tilt direction, and the first sleeve ring 23 and the second sleeve ring 24 are respectively provided with a plurality of regular first filter holes 231 and second filter holes 241, the first filter holes 231 and the second filter holes 241 are both square, and the aperture of the first filter hole 231 is smaller than that of the second filter hole 241.

[0053] The melting unit includes a melting inner shell 31 fixed in the intermediate shell 12, and a vertical lower guide 32 is fixedly provided at the upper end of the melting inner shell 31. The lower guide 32 is located below the first sleeve ring 23 and is used to receive a small volume of waste plastic falling from the first sleeve ring 23.

[0054] The second crushing unit includes a vertical crushing inner shell 33, an expansion block 34 is fixedly arranged at the upper end of the crushing inner shell 33, the upper end width of the expansion block 34 is greater than the lower end, the expansion block 34 is located below the second sleeve ring 24, and is used to receive a large volume of waste plastics falling from the second sleeve ring 24; a horizontal crushing assembly is rotatably arranged inside the crushing inner shell 33, a servo motor 35 is fixedly arranged at the right end of the crushing inner shell 33, the output shaft of the servo motor 35 is fixed to the crushing assembly, and provides rotational power for the crushing assembly.

[0055] The crushing assembly includes a rotating shaft 36, on which a plurality of fixed discs 37 are arranged at intervals; the front end surface of each fixed disc 37 is fixedly provided with three front end crushing arms 381 by bolts, and the distances between adjacent front end crushing arms 381 are consistent; the rear end surface of each fixed disc 37 is fixedly provided with three rear end crushing arms 382, ​​and the distances between adjacent rear end crushing arms 382 are consistent;

[0056] The front end surface of the fixed disc 37 is provided with three front end positioning areas, and the front end positioning area is located at the central position between the two adjacent front end crushing arms 381; the back side of the fixed disc 37 is provided with three rear end positioning areas corresponding to the positions of the three front end positioning areas, and the three rear end crushing arms 382 are respectively fixed at the three rear end positioning areas by bolts.

[0057] The fixed disc 37 rotates counterclockwise, and the side where the front crushing arm 381 and the rear crushing arm 382 rotate counterclockwise is the contact section 39 . The contact section 39 is inclined and has a plurality of sharp cuts 391 .

[0058] Among them, a plurality of electric heating tubes 41 are fixedly arranged at the bottom of the melting inner shell 31, and each electric heating tube 41 is arranged side by side; a horizontal heat conducting plate 42 is fixedly arranged inside the melting inner shell 31, and the heat conducting plate 42 is located above the electric heating tube 41, and the heat conducting plate 42 is inclined. An inner hole connected to the lower part of the heat conducting plate 42 is opened in the left wall of the melting inner shell 31, and a solenoid valve 43 is fixedly arranged outside the inner hole, and the solenoid valve 43 is connected to the multi-axis printing unit through an outer tube 44;

[0059] A limit main seat 50 is fixedly provided on the right outer wall of the melting inner shell 31, and a first through hole 51 and a second through hole 52 are respectively provided in the limit main seat 50 and the melting inner shell 31, and the aperture of the second through hole 52 is smaller than that of the first through hole 51; the temperature measuring sensor 60 includes an extension section 61 and a temperature measuring section 62 which can be respectively extended into the first through hole 51 and the second through hole 52; a plurality of first sealing rings 631 which can be connected with the extension section 61 which is extended into the first through hole 51 are provided in the limit main seat 50; a plurality of second sealing rings 632 which can be connected with the temperature measuring section 62 which is extended into the second through hole 52 are provided in the melting inner shell 31;

[0060] An automated internal pressure assembly is disposed in the limiting main seat 50 . When the extension section 61 extends into the first through hole 51 and abuts against the wall of the molten inner shell 31 , the temperature measuring section 62 will extend into the interior of the molten inner shell 31 , and the automated internal pressure assembly will press and secure the extension section 61 in the first through hole 51 .

[0061] Among them, an inner groove is opened in the limit main seat 50, and the automated internal pressure component includes an inner fixed seat 64 fixed in the inner groove, the inner fixed seat 64 is hollow inside, and the top of the inner fixed seat 64 is open and communicated with the first through hole 51; an execution block 65, an intermediate connecting block 66 and a force block 67 are arranged inside the inner fixed seat 64, the execution block 65 is located at the upper end of the intermediate connecting block 66, and a first embedded block 681 extending into the interior of the intermediate connecting block 66 is fixedly arranged at the lower end of the execution block 65; the force block 67 is located at the lower end of the intermediate connecting block 66, and a second embedded block 682 extending into the interior of the intermediate connecting block 66 is fixedly arranged at the upper end of the force block 67, and the first embedded block 681, the second embedded block 682 and the intermediate connecting block 66 are fixed by transverse locking screws;

[0062] The optimization is that a slope 651 is provided on the right side of the upper end of the execution pressing block 65. When the slope 651 is in contact with the extension section 61, the execution pressing block 65 is pressed down to allow the extension section 61 to smoothly extend into the first through hole 51.

[0063] Side blocks 71 are fixedly arranged on both sides of the bottom of the inner fixing seat 64, and a force-driven cavity 72 is formed between the two side blocks 71. The force-driven cavity 72 is extended downwardly into the force-driven cavity 72. A compression spring 73 located in the force-driven cavity 72 is compressed and arranged between the bottom of the inner fixing seat 64 and the force-driven cavity 67. The compression spring 73 can push the execution pressing block 65 to move upward; an inner pressure groove 611 is opened at the lower end of the extension section 61, and the execution pressing block 65 can be pressed into the inner pressure groove 611 to achieve the purpose of fixing the temperature measuring sensor 60;

[0064] There is space between the two side blocks 71 and the middle connecting block 66 for the middle connecting block 66 to move; and when the two side blocks 71 abut against the middle connecting block 66, there is space between the force block 67 and the bottom of the inner fixing seat 64 to prevent the compression spring 73 from being crushed.

[0065] Among them, a follower block 81 is fixedly provided on the upper end of the middle connecting block 66, and the left end of the follower block 81 is in contact with the left inner wall of the inner fixed seat 64, and the right end is in contact with the execution pressure block 65; a stopping block 82 is fixedly provided on the top of the inner fixed seat 64, and the following block 81 can stop moving after the stopping block 82 collides with the following block 81; the stopping block 82 and the following block 81 are both provided with recessed surfaces on the side facing each other, and a recessed cavity 83 is formed between the two recessed surfaces, and the recessed cavity 83 is located in the left half of the stopping block 82 and the following block 81; a first opening 84 connected to the recessed cavity 83 is provided in the inner fixed seat 64, and a second opening 85 connected to the first opening 84 is provided in the limiting main seat 50, and the second opening 85 extends to the right end wall of the limiting main seat 50 and is fixedly provided with an interface 851.

[0066] Among them, the upper end of the execution pressing block 65 is fixedly provided with a first conductive block 861 and a second conductive block 862 spaced apart; the execution pressing block 65, the first embedded block 681 and the force-bearing block 67 are provided with a first wire-passing hole 871 connected to the first conductive block 861, the execution pressing block 65, the second embedded block 682 and the force-bearing block 67 are provided with a second wire-passing hole 872 connected to the second conductive block 862, the first wire-passing hole 871 and the second wire-passing hole 872 are both connected to the force-bearing driving cavity 72, the limiting main seat 50 is provided with a wire outlet hole 874 extending to its right end wall, and the bottom of the inner fixed seat 64 is provided with a bottom hole 873 connecting the force-bearing driving cavity 72 with the wire outlet hole 874;

[0067] A conductive layer 612 is fixedly disposed at the bottom of the inner pressure groove 611 . When the execution pressing block 65 is pressed into the inner pressure groove 611 , the first conductive block 861 and the second conductive block 862 form a passage through the conductive layer 612 .

[0068] The optimization is that the first conductive block 861 can be grounded through a wire, the second conductive block 862 can be connected to a 3V power supply after connecting a resistor through a wire, and the second conductive block 862 will also be connected to the enable pin of the controller through a wire to realize input detection; in the initial state, the first conductive block 861 and the second conductive block 862 are separated, and the circuit between the two is broken, and the enable pin of the controller detects a high level of the 3V power supply; when the execution pressure block 65 is pressed into the inner pressure groove 611, the first conductive block 861 and the second conductive block 862 form a passage through the conductive layer 612, and the second conductive block 862 will be grounded through the first conductive block 861, and the enable pin of the controller detects a low level; thus, detection can be realized through the level state of the enable pin of the controller, and the controller can be connected to the PLC to realize overall control.

[0069] It is optimized that the first wire passing hole 871 , the second wire passing hole 872 , the wire outlet hole 874 , the force-driven cavity 72 and the bottom hole 873 are used for leading out the wires on the first conductive block 861 and the second conductive block 862 .

[0070] The multi-axis printing unit includes a support base 911 fixed to the bottom of the lower shell 13, and vertical arms 912 are fixedly arranged on the left and right ends of the support base 911, and a top cover 913 is fixed on the upper ends of the two vertical arms 912; two driving shafts 92 are arranged between the support base 911 and the top cover 913, and a movable panel 93 is slidably arranged on the two driving shafts 92, and a first motor for providing power to the two driving shafts 92 is arranged on the top cover 913, and the movable panel 93 is provided with threaded holes for the two driving shafts 92 to pass through, and the outer peripheries of the two driving shafts 92 are provided with external threads that are threaded with the corresponding threaded holes; two first guide rails 941 are arranged on the movable panel 93, and a movable block 95 is slidably arranged on the two first guide rails 941, and a first guide belt 942 passing through the movable block 95 is arranged on the movable panel 93, and the first guide belt 942 is driven by the second motor; a printing nozzle 951 is arranged on the movable block 95, and the outer tube 44 is connected to the printing nozzle 951;

[0071] Two second guide rails 961 are provided on the support seat 911 , and a bearing panel 962 is slidably provided on the two second guide rails 961 . A second guide belt 963 passing through the bearing panel 962 is provided on the support seat 911 , and the second guide belt 963 is driven by a third motor 964 .

[0072] The working principle of this embodiment is:

[0073] 1. First, place the waste plastics in the receiving base 21. The waste plastics slide down along the inclined receiving base 21. The large and small waste plastics will first pass through the first sleeve ring 23. The small waste plastics will fall in the first filter hole 231 and fall into the melting inner shell 31 through the lower guide 32. The large waste plastics will pass through the second sleeve ring 24 and fall into the expansion block 34 through the second filter hole 241, and then fall into the crushing inner shell 33. The remaining waste plastics need to be fragmented again.

[0074] 2. The crushing assembly in the crushing inner shell 33 cuts and crushes the large volume of waste plastics to form small volume of waste plastics which fall into the melting inner shell 31 .

[0075] 3. The temperature inside the molten inner shell 31 is increased by the electric heating tube 41 inside the molten inner shell 31 ; the temperature sensor 60 can monitor the temperature inside the molten inner shell 31 in real time.

[0076] 4. The plastic liquid that has been melted in the melting inner shell 31 will be sent to the printing nozzle 951 through the outer tube 44. The printing nozzle 951 can move in two axes, and the bearing panel 962 can move in one axis. Through cooperation, three-axis 3D printing can be realized.

[0077] The installation and removal process of the temperature sensor 60 is as follows:

[0078] 1. When installing the temperature sensor 60, the extension section 61 and the temperature measuring section 62 of the temperature sensor 60 extend into the first through hole 51 and the second through hole 52 respectively until the extension section 61 collides with the molten inner shell 31 to limit the position; at this time, the execution pressing block 65 can extend into the inner pressure groove 611 under the thrust of the compression spring 73 to achieve the purpose of fixing the temperature sensor 60; the alignment of the inner pressure groove 611 and the execution pressing block 65 can be achieved by rotating the temperature sensor 60.

[0079] Specifically, the inclined surface 651 on the execution pressing block 65 can allow the execution pressing block 65 to continuously move downward during the process of contacting with the extension section 61 , thereby allowing the extension section 61 to smoothly extend into the first through hole 51 .

[0080] 2. When disassembling the temperature sensor 60, air is sent into the interface 851, and the air is sent into the recessed cavity 83 through the second opening 85 and the first opening 84, and then pushes down the middle connecting block 66, so that the execution pressing block 65 is hidden inside the inner fixing seat 64, so that the temperature sensor 60 can be disassembled.

[0081] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A 3D printer for recycling waste plastics, characterized in that: The invention comprises an upper shell (11), an intermediate shell (12) and a lower shell (13) which are stacked in sequence from top to bottom, wherein a waste plastic classification unit is arranged in the upper shell (11), a re-crushing unit and a melting unit are arranged in the intermediate shell (12), and a multi-axis printing unit for 3D printing is arranged in the lower shell (13); The waste plastic classification unit is used to place waste plastics and classify the waste plastics, so that small-volume waste plastics are directly sent to the melting unit and large-volume waste plastics are sent to the re-crushing unit; the output end of the re-crushing unit is connected to the melting unit, and the output end of the melting unit is connected to the multi-axis printing unit; The melting unit includes a temperature sensor (60) that can be quickly installed and removed; The melting unit comprises a melting inner shell (31) fixed in an intermediate shell (12); A plurality of electric heating tubes (41) are fixedly arranged at the bottom of the molten inner shell (31), and the electric heating tubes (41) are arranged side by side; a transverse heat conducting plate (42) is fixedly arranged inside the molten inner shell (31), and the heat conducting plate (42) is located above the electric heating tube (41), and the heat conducting plate (42) is inclined; an inner hole connected to the lower part of the heat conducting plate (42) is opened in the left side wall of the molten inner shell (31), and a solenoid valve (43) is fixedly arranged on the outer side of the inner hole, and the solenoid valve (43) is connected to the multi-axis printing unit through an outer tube (44); A limit main seat (50) is fixedly arranged on the right outer wall of the melting inner shell (31); a first through hole (51) and a second through hole (52) communicating with each other are respectively provided in the limit main seat (50) and the melting inner shell (31); the aperture of the second through hole (52) is smaller than that of the first through hole (51); the temperature measuring sensor (60) comprises an extension section (61) and a temperature measuring section (62) which can be respectively extended into the first through hole (51) and the second through hole (52); a plurality of first sealing rings (631) which can be connected to the extension section (61) which is extended into the first through hole (51) are arranged in the limit main seat (50); a plurality of second sealing rings (632) which can be connected to the temperature measuring section (62) which is extended into the second through hole (52) are arranged in the melting inner shell (31); An automated internal pressure assembly is arranged in the position limiting main seat (50); when the extension section (61) extends into the first through hole (51) and abuts against the wall of the molten inner shell (31), the temperature measuring section (62) extends into the interior of the molten inner shell (31), and the automated internal pressure assembly presses and fixes the extension section (61) located in the first through hole (51); An inner groove is provided in the limit main seat (50), and the automated internal pressure assembly includes an inner fixed seat (64) fixed in the inner groove, the inner portion of the inner fixed seat (64) is hollow, and the top of the inner fixed seat (64) is open and communicates with the first through hole (51); an execution block (65), an intermediate connecting block (66) and a force block (67) are arranged inside the inner fixed seat (64), the execution block (65) is located at the upper end of the intermediate connecting block (66), and the lower end of the execution block (65) is fixedly provided with a first embedded block (681) extending into the interior of the intermediate connecting block (66); the force block (67) is located at the lower end of the intermediate connecting block (66), and the upper end of the force block (67) is fixedly provided with a second embedded block (682) extending into the interior of the intermediate connecting block (66), and the first embedded block (681), the second embedded block (682) and the intermediate connecting block (66) are fixed by transverse locking screws; Side blocks (71) are fixedly arranged on both sides of the inner bottom of the inner fixed seat (64), a force-driven cavity (72) is formed between the two side blocks (71), the force-bearing block (67) extends downward into the force-driven cavity (72), and a compression spring (73) located in the force-driven cavity (72) is compressed and arranged between the bottom of the inner fixed seat (64) and the force-bearing block (67), and the compression spring (73) can push the execution pressing block (65) to move upward; an inner pressure groove (611) is opened at the lower end of the extension section (61), and the execution pressing block (65) can be pressed into the inner pressure groove (611) to achieve the purpose of fixing the temperature measuring sensor (60); There is a space between the two side blocks (71) and the middle connecting block (66) for the middle connecting block (66) to move; and when the two side blocks (71) and the middle connecting block (66) are in contact with each other, there is a space between the force-bearing block (67) and the bottom of the inner fixing seat (64) to prevent the compression spring (73) from being crushed; A follower block (81) is fixedly arranged on the upper end of the intermediate connecting block (66), and the left end of the follower block (81) is in contact with the left inner wall of the inner fixing seat (64), and the right end is in contact with the execution pressing block (65); a stop block (82) is fixedly arranged on the top of the inner fixing seat (64), and the stop block (82) can stop the follower block (81) from moving after colliding with the follower block (81); the stop block (82) and the follower block (81) are both provided with a concave surface on one side facing the other. A recessed cavity (83) is formed between the two recessed surfaces, and the recessed cavity (83) is located at the left half of the stopping block (82) and the following block (81); a first opening (84) connected to the recessed cavity (83) is provided in the inner fixing seat (64), and a second opening (85) connected to the first opening (84) is provided in the limit main seat (50); the second opening (85) extends to the right end wall of the limit main seat (50) and is fixedly provided with an interface (851); The upper end of the execution pressing block (65) is fixedly provided with a first conductive block (861) and a second conductive block (862) spaced apart from each other; the execution pressing block (65), the first insert block (681) and the force-bearing block (67) are provided with a first wire-passing hole (871) connected to the first conductive block (861); the execution pressing block (65), the second insert block (682) and the force-bearing block (67) are provided with a second wire-passing hole (872) connected to the second conductive block (862); the first wire-passing hole (871) and the second wire-passing hole (872) are both connected to the force-bearing driving cavity (72); the limit main seat (50) is provided with a wire outlet hole (874) extending to its right end wall; the bottom of the inner fixed seat (64) is provided with a bottom hole (873) connecting the force-bearing driving cavity (72) with the wire outlet hole (874); A conductive layer (612) is fixedly arranged at the bottom of the inner pressure groove (611), and when the execution pressing block (65) is pressed into the inner pressure groove (611), the first conductive block (861) and the second conductive block (862) form a passage through the conductive layer (612).

2. A 3D printer for recycling waste plastics according to claim 1, characterized in that: The waste plastic classification unit comprises a receiving base (21) fixed in an upper shell (11), the receiving base (21) is arranged at an angle, and side baffles (22) are fixedly arranged on the inner and outer sides of the receiving base (21); the receiving base (21) is provided with a first sleeve ring (23) and a second sleeve ring (24) in sequence from high to low along its own inclination direction, and the first sleeve ring (23) and the second sleeve ring (24) are respectively provided with a plurality of regular first filter holes (231) and second filter holes (241), the first filter holes (231) and the second filter holes (241) are both square, and the aperture of the first filter holes (231) is smaller than that of the second filter holes (241).

3. A 3D printer for recycling waste plastics according to claim 2, characterized in that: A vertical lower guideway (32) is fixedly provided at the upper end of the melting inner shell (31), and the lower guideway (32) is located below the first sleeve ring (23) and is used to receive a small volume of waste plastic falling from the first sleeve ring (23); The re-crushing unit comprises a vertical crushing inner shell (33), an expansion block (34) is fixedly arranged at the upper end of the crushing inner shell (33), the upper end width of the expansion block (34) is greater than the lower end, the expansion block (34) is located below the second sleeve ring (24), and is used to receive a large volume of waste plastics falling from the second sleeve ring (24); a horizontal crushing assembly is rotatably arranged inside the crushing inner shell (33), a servo motor (35) is fixedly arranged at the right end of the crushing inner shell (33), the output shaft of the servo motor (35) is fixed to the crushing assembly, and provides rotational power for the crushing assembly.

4. A 3D printer for recycling waste plastics according to claim 3, characterized in that: The crushing assembly comprises a rotating shaft (36), on which a plurality of fixed discs (37) are arranged at intervals; the front end surface of each fixed disc (37) is fixedly provided with three front end crushing arms (381) by means of bolts, and the spacing between adjacent front end crushing arms (381) is consistent; the rear end surface of each fixed disc (37) is fixedly provided with three rear end crushing arms (382), and the spacing between adjacent rear end crushing arms (382) is consistent; The front end surface of the fixed disc (37) is provided with three front end positioning areas, and the front end positioning areas are located at the central position between two adjacent front end crushing arms (381); the back side of the fixed disc (37) is provided with three rear end positioning areas corresponding to the positions of the three front end positioning areas, and the three rear end crushing arms (382) are respectively fixed to the three rear end positioning areas by bolts.

5. A 3D printer for recycling waste plastics according to claim 4, characterized in that: The fixed disc (37) rotates in the counterclockwise direction, and the side where the front crushing arm (381) and the rear crushing arm (382) rotate in the counterclockwise direction is a contact section (39). The contact section (39) is inclined, and a plurality of sharp cuts (391) are provided on the contact section (39).

6. A 3D printer for recycling waste plastics according to claim 1, characterized in that: The multi-axis printing unit comprises a support base (911) fixed to the bottom of the lower shell (13); the left and right ends of the support base (911) are fixedly provided with vertical arms (912); the upper ends of the two vertical arms (912) are fixedly provided with top covers (913); two driving shafts (92) are provided between the support base (911) and the top cover (913); a movable panel (93) is slidably provided on the two driving shafts (92); a first motor for providing power to the two driving shafts (92) is provided on the top cover (913); and the movable panel (93) is provided with a first motor for providing power to the two driving shafts (92). The movable panel (93) comprises a plurality of threaded holes through which a driving shaft (92) passes, and the outer circumferences of the two driving shafts (92) are provided with external threads that are threadedly matched with the corresponding threaded holes; the movable panel (93) is provided with two first guide rails (941), and a movable block (95) is slidably arranged on the two first guide rails (941); the movable panel (93) is provided with a first guide belt (942) that passes through the movable block (95), and the first guide belt (942) is driven by a second motor; the movable block (95) is provided with a printing nozzle (951), and the outer tube (44) is connected to the printing nozzle (951); The support seat (911) is provided with two second guide rails (961), a bearing panel (962) is slidably provided on the two second guide rails (961), the support seat (911) is provided with a second guide belt (963) passing through the bearing panel (962), and the second guide belt (963) is driven by a third motor (964).

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