A 3D rapid modeling device

Abstract

The present invention belongs to the field of 3D printing technology, and in particular, relates to a 3D rapid modeling device, including a machine body, a print nozzle and a discharge wheel assembly, wherein the print nozzle is arranged on the inner side of the machine body, and the discharge wheel assembly is arranged on the back of the machine body, and further includes: a feed box, which is arranged on the inner side of the machine body and mounted on the back of the print nozzle, and a wire feeding drive mechanism is arranged inside the feed box; a support ring is mounted on the inner wall of the feed box, and the support ring is arranged at the discharge end of the feed box, and a contact resistance adjustment mechanism is arranged inside the support ring. The present invention can automatically adjust the wire feeding amount based on the consumable diameter defect, improve the accuracy of consumable transportation, and help improve the accuracy of 3D modeling printing. At the same time, it can preheat and dry the consumables, and automatically remind personnel to replace the consumables when there are too many consumable defects, and trace the cause of the consumable defects to improve the subsequent 3D modeling printing quality.

Description

Technical Field

[0001] The invention belongs to the technical field of 3D printing, and in particular relates to a 3D rapid modeling device. Background Art

[0002] 3D printing rapid modeling technology uses advanced digital design and additive manufacturing principles to quickly transform complex three-dimensional models into entities, and achieves an efficient and flexible manufacturing process by precisely controlling the accumulation and fusion of materials.

[0003] At present, there are many types of 3D printing equipment, and the most common one is the thermoplastic 3D printing equipment, which uses thermoplastic materials for additive manufacturing, melts the materials by heating, and then accurately extrudes and stacks them into shape. For example, a PET plastic 3D printer disclosed in patent announcement number CN109049405B;

[0004] There are many kinds of raw materials used in thermoplastic 3D printing equipment, such as common thermoplastic polyurethane, polycarbonate, polylactic acid, etc. These raw materials need to be extruded into strips through an extruder, and then the wire feeding mechanism of the printer feeds the strip materials into the nozzle according to the program for heating and ejection to complete the 3D printing action. However, due to the processing error of the extruder, cooling and shaping error, transportation bumps and other reasons, the cross-section of some parts of the strip material may be too large or too small. When the wire feeding mechanism of the printing equipment feeds the wire according to the program, the amount of strip material entering the nozzle may be higher or lower than the required amount, thereby affecting the printing accuracy of the 3D printing equipment. Summary of the invention

[0005] The purpose of the present invention is to provide a 3D rapid modeling device in view of the above problems.

[0006] To achieve the above object, the present invention adopts the following technical solutions: a 3D rapid modeling device, comprising a machine body, a print nozzle and a discharge wheel assembly, wherein the print nozzle is arranged on the inner side of the machine body, and the discharge wheel assembly is arranged on the back of the machine body, and further comprising:

[0007] A feed box is arranged on the inner side of the machine body, and the feed box is installed on the back of the print head, and a wire feeding drive mechanism is arranged inside the feed box;

[0008] A support ring is installed on the inner wall of the feeding box, and the support ring is arranged at the discharge end of the feeding box, and a contact resistance adjustment mechanism is arranged inside the support ring;

[0009] A mounting cover is fixedly inserted into the side wall of the feed box, wherein a synchronous drive mechanism connected to the wire feeding drive mechanism is arranged inside the mounting cover, and a speed regulating mechanism is installed together with the synchronous drive mechanism and the mounting cover, and the control end of the machine body regulates the output power of the wire feeding drive mechanism according to the electrical signal output by the speed regulating mechanism;

[0010] A dehumidification unit is installed on the outer side wall of the feeding box and is arranged at the feeding end of the feeding box. A prompt component is arranged inside the dehumidification unit, and the prompt component is electrically connected to the contact resistance adjustment mechanism through the control end of the body.

[0011] Preferably, the wire feeding drive mechanism includes a wire feeding gear and a pressure wheel rotatably arranged inside a feeding box, the pressure wheel is arranged on one side of the wire feeding gear, a stepper motor is fixedly mounted on the outer wall of the feeding box, and the output shaft of the stepper motor is transmission-connected to the wire feeding gear, the stepper motor is electrically connected to the control end of the machine body, and two opposite side walls of the feeding box are provided with wire holes.

[0012] Preferably, the contact resistance adjustment mechanism includes a plurality of circular grooves provided on the outer wall of the support ring, and the bottom of each circular groove is slidably connected with a T-shaped insulating rod, a spring is fixedly provided between the T-shaped insulating rod and the bottom of the circular groove on the same side, a pressure block is fixedly installed on the end of the T-shaped insulating rod away from the circular groove on the same side, and a ball groove is provided on the end of the pressure block away from the T-shaped insulating rod on the same side, a steel ball is rotatably provided inside the ball groove, a conductive ring is fixedly sleeved on the rod wall of the T-shaped insulating rod, an insulating sleeve is sleeved on the outer side of the conductive ring, and the insulating sleeve is installed on the inner wall of the support ring, a resistor sleeve is fixedly installed on the inner wall of the insulating sleeve, and the inner wall of the resistor sleeve is in sliding contact with the conductive ring, and the resistor sleeve is electrically connected to the control end of the body through the conductive ring on the same side.

[0013] Preferably, the synchronous drive mechanism comprises a first sprocket rotatably arranged inside the mounting cover, the axle of the wire feeding gear is fixedly sleeved with a second sprocket, and the first sprocket and the second sprocket are jointly transmission-connected by a chain.

[0014] Preferably, the speed regulating mechanism comprises a plurality of magnetic isolation cylinders fixedly mounted on the outer wall of the chain, and a damping piston is slidably arranged inside each magnetic isolation cylinder, a non-magnetic movable rod is fixedly mounted on the end of each damping piston away from the chain, and a permanent magnet block is fixedly mounted on the end of the non-magnetic movable rod away from the damping piston on the same side, a miniature electromagnetic push rod is fixedly mounted on the inner wall of the mounting cover, and a permanent magnet column is fixedly mounted on the telescopic end of the miniature electromagnetic push rod, an infrared ranging probe is fixedly mounted on the inner wall of the mounting cover on the side opposite to the permanent magnet column, the miniature electromagnetic push rod is electrically connected to the conductive ring and the resistance sleeve through the control end of the machine body, a magnetic isolation slot plate is installed on the inner wall of the mounting cover at a position on one side of the miniature electromagnetic push rod, and a permanent magnet plate is installed inside the magnetic isolation slot plate, and the control end of the machine body controls the output power of the stepper motor according to the strength of the electrical signal output by the infrared ranging probe.

[0015] Preferably, the dehumidification unit includes a dehumidification box fixedly mounted on the outer wall of the feeding box, two opposite side walls of the dehumidification box are provided with circular holes coaxial with the through-wire holes, two groups of elastic telescopic components staggered from each other are provided inside the dehumidification box, and the two groups of elastic telescopic components are arranged on two opposite inner walls of the dehumidification box, and the telescopic ends of each of the elastic telescopic components are rotatably provided with rollers, a heating box is fixedly mounted on the outer wall of the dehumidification box, and an electric heater is fixedly mounted inside the heating box, a plurality of air supply holes are jointly provided on the side walls of the heating box and the dehumidification box, an air pump is fixedly mounted on the outer wall of the heating box, and the air outlet end of the air pump is connected to the heating box, an air outlet hole is provided on the side wall of the dehumidification box away from the heating box, and the electric heater and the air pump are electrically connected to the control end of the machine body.

[0016] Preferably, the prompt component includes a branch hole opened on the side wall of the dehumidification box away from the heating box, the outer wall of the dehumidification box is fixedly installed with a mounting tube connected to the branch hole, and the tube wall of the mounting tube is fixedly plugged with a temperature detector, the temperature measuring end of the temperature detector is arranged inside the mounting tube, a normally open solenoid valve is installed inside the air outlet, a normally closed solenoid valve is installed inside the branch hole, a normally closed solenoid switch and a normally open solenoid switch are fixedly installed inside the dehumidification box, the control end of the body controls the operation of the normally open solenoid valve and the normally closed solenoid valve according to the closing electrical signal of the normally closed solenoid switch and the normally open solenoid switch, the normally open solenoid switch and the normally closed solenoid switch are both electrically connected to the conductive ring and the resistance sleeve through the control end of the body, and the temperature detector is electrically connected to the control end of the body.

[0017] Preferably, a conductive pad is fixedly inserted into the bottom of each ball groove, and the inner wall of the conductive pad is in contact with the steel ball on the same side. A grounding cable is fixedly installed on the outer wall of the support ring, and each conductive pad is electrically connected to the grounding cable.

[0018] Compared with the existing technology, the advantages of a 3D rapid modeling device are:

[0019] Through the mutual cooperation of the set machine body, printing nozzle, discharge wheel assembly, feeding box, wire feeding drive mechanism, support ring, and contact resistance adjustment mechanism, the diameter of the filament can be monitored in real time during the 3D printing process, and in conjunction with the set installation cover, synchronous drive mechanism and speed regulation mechanism, the wire feeding amount can be automatically adjusted based on the filament diameter defect, thereby improving the accuracy of filament transportation, which is conducive to improving the accuracy of 3D modeling and printing.

[0020] The dehumidification unit can be used to dry and remove water vapor that may be adsorbed on the surface of the filaments during the process of conveying the filaments, so as to prevent water vapor from affecting the quality of 3D printing, and to prevent water vapor evaporation from causing excessive pressure inside the nozzle, affecting the normal operation of the nozzle. In addition, the conductive pad and grounding cable can be used to conduct static electricity that may exist on the surface of the filaments after drying, so as to prevent static electricity from affecting the normal operation of the machine.

[0021] Through the set reminder mechanism, the air source of the dehumidification unit can be utilized, and based on the monitoring results of the contact resistance adjustment mechanism, when intensive defects on the surface of the consumables are detected, the personnel can be automatically reminded to replace the consumables in time, and the causes of the consumables defects can be traced to improve the subsequent 3D modeling and printing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a 3D rapid modeling device provided by the present invention;

[0023] Figure 2 The invention provides a 3D rapid modeling device Figure 1 A magnified view of the structure of part A;

[0024] Figure 3 It is a schematic diagram of the internal top view structure of a feeding box of a 3D rapid modeling device provided by the present invention;

[0025] Figure 4 It is a schematic cross-sectional structure diagram of a support ring of a 3D rapid modeling device provided by the present invention;

[0026] Figure 5 The invention provides a 3D rapid modeling device Figure 4 A magnified view of the structure of part B;

[0027] Figure 6 It is a schematic diagram of the internal structure of a pressure block of a 3D rapid modeling device provided by the present invention;

[0028] Figure 7 It is a schematic diagram of the internal structure of a magnetic isolation cylinder of a 3D rapid modeling device provided by the present invention;

[0029] Figure 8 The present invention provides a schematic diagram of the internal top view structure of a dehumidification box of a 3D rapid modeling device.

[0030] In the figure: 1 body, 2 print nozzle, 3 feeding wheel assembly, 4 feeding box, 5 wire feeding drive mechanism, 51 wire feeding gear, 52 pressing wheel, 53 stepping motor, 54 wire hole, 6 support ring, 7 contact resistance adjustment mechanism, 71 round groove, 72 T-shaped insulating rod, 73 spring, 74 pressing block, 75 ball groove, 76 steel ball, 77 conductive ring, 78 insulating sleeve, 79 resistance sleeve, 8 mounting cover, 9 synchronous driving mechanism, 91 first sprocket, 92 second sprocket, 93 chain, 10 speed regulating mechanism, 101 magnetic isolation cylinder, 102 damping piston, 103 non-magnetic movable rod, 104 permanent magnet block, 105 micro electromagnetic push rod, 106 permanent magnetic column, 107 infrared ranging probe, 108 magnetic isolation slot plate, 109 permanent magnetic plate, 11 dehumidification unit, 111 dehumidification box, 112 round hole, 113 elastic telescopic component, 114 roller, 115 heating box, 116 electric heater, 117 air supply hole, 118 air pump, 119 air outlet hole, 12 prompt component, 121 branch hole, 122 installation pipe, 123 temperature detector, 124 normally open solenoid valve, 125 normally closed solenoid valve, 126 normally closed solenoid switch, 127 normally open solenoid switch, 13 conductive pad, 14 grounding cable. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] like Figure 1-Figure 8 As shown, a 3D rapid modeling device includes a body 1, a print head 2 and a feeding wheel assembly 3. The print head 2 is arranged on the inner side of the body 1, and the feeding wheel assembly 3 is arranged on the back of the body 1. The body 1 is also provided with a print head, a control computer, an X-axis, a Y-axis, a Z-axis driving mechanism, a printing platform and other structures. This is an existing mature technology, so it is not described here. A feeding box 4 is arranged on the inner side of the body 1, and the feeding box 4 is installed on the back of the print head 2. A wire feeding driving mechanism 5 is arranged inside the feeding box 4. The wire feeding drive mechanism 5 includes a wire feeding gear 51 and a pressure wheel 52 rotatably arranged inside the feeding box 4. The pressure wheel 52 is arranged on one side of the wire feeding gear 51. A stepper motor 53 is fixedly installed on the outer wall of the feeding box 4, and the output shaft of the stepper motor 53 is transmission-connected to the wire feeding gear 51. The stepper motor 53 is electrically connected to the control end of the machine body 1. Wire holes 54 are provided on the two opposite side walls of the feeding box 4. The stepper motor 53 can drive the wire feeding gear 51 to work according to the control program of the control end of the machine body 1.

[0033] The support ring 6 is installed on the inner wall of the feeding box 4, and the support ring 6 is arranged at the discharge end of the feeding box 4. A contact resistance adjustment mechanism 7 is arranged inside the support ring 6. The contact resistance adjustment mechanism 7 includes a plurality of circular grooves 71 arranged on the outer wall of the support ring 6, and the bottom of each circular groove 71 is slidably connected with a T-shaped insulating rod 72. A spring 73 is fixedly arranged between the T-shaped insulating rod 72 and the bottom of the circular groove 71 on the same side. A pressing block 74 is fixedly arranged on one end of the T-shaped insulating rod 72 away from the circular groove 71 on the same side, and a pressing block 74 is arranged on one end of the pressing block 74 away from the T-shaped insulating rod 72 on the same side. The ball groove 75 has a steel ball 76 that rotates inside the ball groove 75. The rod wall of the T-shaped insulating rod 72 is fixedly sleeved with a conductive ring 77. The outer side of the conductive ring 77 is sleeved with an insulating sleeve 78, and the insulating sleeve 78 is installed on the inner wall of the support ring 6. The inner wall of the insulating sleeve 78 is fixedly installed with a resistor sleeve 79, and the inner wall of the resistor sleeve 79 is in sliding contact with the conductive ring 77. The resistor sleeve 79 is electrically connected to the control end of the body 1 through the conductive ring 77 on the same side. Under the action of the steel ball 76, the friction between the pressing block 74 and the consumables can be reduced to ensure that the consumables can move normally.

[0034] The mounting cover 8 is fixedly inserted into the side wall of the feed box 4, and a synchronous drive mechanism 9 is provided inside the mounting cover 8, which is transmission-connected to the wire feeding drive mechanism 5. The synchronous drive mechanism 9 includes a first sprocket 91 rotatably arranged inside the mounting cover 8, and a second sprocket 92 is fixedly sleeved on the axle of the wire feeding gear 51, and the first sprocket 91 and the second sprocket 92 are jointly transmission-connected with a chain 93. Under the action of the first sprocket 91 and the second sprocket 92, the chain 93 can operate synchronously with the wire feeding gear 51.

[0035] The synchronous drive mechanism 9 and the mounting cover 8 are jointly equipped with a speed regulating mechanism 10. The control end of the body 1 adjusts the output power of the wire feeding drive mechanism 5 according to the electrical signal output by the speed regulating mechanism 10. The speed regulating mechanism 10 includes a plurality of magnetic isolation cylinders 101 fixedly mounted on the outer wall of the chain 93, and a damping piston 102 is slidably provided inside each magnetic isolation cylinder 101. A non-magnetic movable rod 103 is fixedly mounted on the end of each damping piston 102 away from the chain 93, and a permanent magnet block 104 is fixedly mounted on the end of the non-magnetic movable rod 103 away from the damping piston 102 on the same side. A micro electromagnetic push rod 105 is fixedly mounted on the inner wall of the mounting cover 8, and a permanent magnet column 106 is fixedly mounted on the telescopic end of the micro electromagnetic push rod 105. An infrared ranging probe 107 is fixedly installed on the inner wall of the mounting cover 8 on the side opposite to the permanent magnetic column 106. The micro electromagnetic push rod 105 is electrically connected to the conductive ring 77 and the resistor sleeve 79 through the control end of the body 1. A magnetic isolation slot plate 108 is installed on the inner wall of the mounting cover 8 at a position on one side of the micro electromagnetic push rod 105, and a permanent magnetic plate 109 is installed inside the magnetic isolation slot plate 108. The control end of the body 1 controls the output power of the stepper motor 53 according to the strength of the electrical signal output by the infrared ranging probe 107. When each magnetic isolation cylinder 101 moves to the position of the permanent magnetic plate 109, under the effect of like repulsion, the permanent magnetic plate 109 will repel each permanent magnetic block 104, thereby causing each damping piston 102 to move back and reset.

[0036] The dehumidification unit 11 is installed on the outer wall of the feeding box 4, and the dehumidification unit 11 is arranged at the feeding end of the feeding box 4. The dehumidification unit 11 includes a dehumidification box 111 fixedly installed on the outer wall of the feeding box 4. The two opposite side walls of the dehumidification box 111 are provided with a circular hole 112 coaxial with the through-wire hole 54. The interior of the dehumidification box 111 is provided with two groups of elastic telescopic components 113 staggered from each other, and the two groups of elastic telescopic components 113 are arranged on the two opposite inner walls of the dehumidification box 111. The telescopic ends of each elastic telescopic component 113 are rotatably provided with a roller 114. A heating box 115 is fixedly installed on the outer wall of the dehumidification box 111, and an electric heater 116 is fixedly installed inside the heating box 115. The heating box 115 and the side wall of the dehumidification box 111 are jointly provided with a plurality of air supply holes 117. The outer wall of the heating box 115 is fixed An air pump 118 is installed, and the air outlet end of the air pump 118 is connected to the heating box 115. An air outlet 119 is provided on the side wall of the dehumidification box 111 away from the heating box 115. The electric heater 116 and the air pump 118 are electrically connected to the control end of the body 1. The electric heater 116 can heat the air and use the heated hot air to preheat and dry the consumables. A box cover is provided on the top of the dehumidification box 111 to facilitate personnel to pass the consumables through each roller 114. The elastic telescopic component 113 includes a cylinder, a movable rod, an elastic member, a connecting block and other components. The roller 114 is rotatably connected to the side wall of the connecting block. Under the action of the elastic telescopic component 113 and the roller 114, the part of the consumables inside the dehumidification box 111 can be kept in a certain tight state, which is conducive to the extrusion and discharge of water vapor adsorbed inside the consumables.

[0037] The dehumidification unit 11 is provided with a prompt component 12 inside, and the prompt component 12 is electrically connected to the contact resistance adjustment mechanism 7 through the control end of the body 1. The prompt component 12 includes a branch hole 121 opened on the side wall of the dehumidification box 111 away from the heating box 115. The outer wall of the dehumidification box 111 is fixedly installed with a mounting pipe 122 connected to the branch hole 121, and the pipe wall of the mounting pipe 122 is fixedly plugged with a temperature detector 123. The temperature measuring end of the temperature detector 123 is arranged inside the mounting pipe 122, and a normally open solenoid valve 124 is installed inside the air outlet 119, and a normally closed solenoid valve 124 is installed inside the branch hole 121. Valve 125, a normally closed electromagnetic switch 126 and a normally open electromagnetic switch 127 are fixedly installed inside the dehumidification box 111, and the control end of the body 1 controls the normally open electromagnetic valve 124 and the normally closed electromagnetic valve 125 to work according to the closing electrical signal of the normally closed electromagnetic switch 126 and the normally open electromagnetic switch 127. The normally open electromagnetic switch 127 and the normally closed electromagnetic switch 126 are both electrically connected to the conductive ring 77 and the resistance sleeve 79 through the control end of the body 1, and the temperature detector 123 is electrically connected to the control end of the body 1. The temperature detector 123 can detect the temperature and transmit an electrical signal to the control end of the body 1 after the temperature reaches the set value.

[0038] A conductive pad 13 is fixedly inserted into the bottom of each ball groove 75, and the inner wall of the conductive pad 13 is in contact with the steel ball 76 on the same side. A grounding cable 14 is fixedly installed on the outer wall of the support ring 6, and each conductive pad 13 is electrically connected to the grounding cable 14. By grounding through the grounding cable 14, static electricity can be discharged in time.

[0039] The operating principle of the present invention is now described as follows: the consumables are wound around the discharge wheel of the discharge wheel assembly 3 of the machine body 1, and the movable end of the consumables is sequentially passed through the circular hole 112 of the dehumidification box 111, the rollers 114 of each elastic telescopic assembly 113, the wire hole 54 of the feeding box 4, the position between the pressing wheel 52 and the wire feeding gear 51, and the position between each steel ball 76, and then the consumables are led out of the feeding box 4 and installed in the printing nozzle 2 of the machine body 1, and then the model file to be printed is transported to the inside of the control end of the machine body 1, and the control end of the machine body 1 will analyze the model file and start the modeling and printing work according to the model file;

[0040] When the machine body 1 starts the modeling and printing work, it will control the stepper motor 53 to work according to the printing requirements of the model file. The stepper motor 53 will drive the wire feeding gear 51 to rotate. With the cooperation of the pressing wheel 52, the wire feeding gear 51 can transport the consumables to the inside of the printing nozzle 2 of the machine body 1, and the printing nozzle 2 heats and melts the consumables, and extrude the molten material according to the requirements of the model file. Through layer-by-layer extrusion and stacking, the 3D printing work of the object can be completed;

[0041] During the wire feeding printing process, after the filament passes through the wire feeding gear 51, it will pass through each steel ball 76 (each steel ball 76 will exert a certain extrusion force on the filament under the action of the T-shaped insulating rod 72 and the spring 73 on the same side). If the diameter of the filament is too large, then after this part of the filament is heated by the nozzle, the amount of melted filament will be more than the preset amount of melted filament, which will cause excessive filament to appear at the printing position. When the diameter of the filament is too large, each T-shaped insulating rod 72 will be squeezed by each steel ball 76. At this time, each conductive ring 77 will move to one side of the support ring 6. Move, thereby causing the overall length of each resistor sleeve 79 connected to the connection loop between the conductive ring 77 and the micro electromagnetic push rod 105 to become shorter. At this time, the current passed into the micro electromagnetic push rod 105 becomes larger, so the magnetic attraction generated by the micro electromagnetic push rod 105 will be synchronously increased, and the distance extended by the telescopic end will be longer. On the contrary, if the diameter of the consumable is too small, or there is a missing position in a local position, the current passed into the micro electromagnetic push rod 105 will be reduced, the magnetic attraction generated by the micro electromagnetic push rod 105 will be synchronously reduced, and the distance extended by the telescopic end will be synchronously shortened;

[0042] During the rotation of the wire feeding gear 51, through the transmission action of the first sprocket 91, the second sprocket 92 and the chain 93, the magnetic isolation cylinders 101 on the surface of the chain 93 will move synchronously, and when the magnetic isolation cylinder 101 moves to the position of the micro electromagnetic push rod 105, under the magnetic attraction of the permanent magnetic column 106, the permanent magnetic block 104 at this location will be adsorbed on the permanent magnetic column 106. If the diameter of the consumable is too large, since the extension distance of the telescopic end of the micro electromagnetic push rod 105 becomes longer, the downward movement distance of the permanent magnetic block 104 at this location becomes shorter, and the extension distance becomes shorter. If the diameter of the consumable is too small, the extension distance of the micro electromagnetic push rod 105 becomes shorter, the downward movement distance of the permanent magnetic block 104 at this location becomes longer, and the extension distance becomes longer. Therefore, if it is detected that the consumable diameter exists For defects that are too large or too small, the permanent magnet block 104 at the corresponding position will move down to a corresponding height. When the magnetic isolation cylinder 101 is driven by the chain 93, the permanent magnet block 104 at this position will be separated from the permanent magnet column 106. Under the friction between the damping piston 102 and the inner wall of the magnetic isolation cylinder 101, the permanent magnet block 104 at this position will maintain the current extension distance. With the operation of the wire feeding gear 51, the defective position on the consumable is transported to the print head 2 of the machine body 1. Since the chain 93 is synchronously operated with the wire feeding gear 51 through the first sprocket 91 and the second sprocket 92, when the defective position is about to be transported to the inside of the print head 2 of the machine body 1, the permanent magnet block 104 corresponding to the defective position will move to the infrared ranging probe 107, and the infrared ranging probe 107 can detect The infrared ranging probe 107 can judge the distance to the permanent magnet block 104 according to the received infrared intensity. For example, when the distance between the permanent magnet block 104 and the infrared ranging probe 107 is small, the reflection of the infrared by the permanent magnet block 104 is relatively concentrated, and the loss is small. Therefore, the infrared intensity detected by the infrared ranging probe 107 is high), and the infrared ranging probe 107 can transmit an electrical signal of corresponding intensity to the control end of the body 1 in real time according to the position of the permanent magnet block 104 (for example, when the distance between the permanent magnet block 104 and the infrared ranging probe 107 is close, since the infrared intensity detected by the infrared ranging probe 107 is high, the electrical signal intensity output to the control end of the body 1 is large). The control end of the body 1 receives the infrared ranging probe 107 according to the position of the permanent magnet block 104. The strength of the transmitted electrical signal controls the output power of the stepper motor 53. For example, when the diameter of the consumable is too large, the distance between the permanent magnet block 104 and the infrared ranging probe 107 is relatively large due to the shortened extension distance of the permanent magnet block 104. Therefore, the strength of the electrical signal output by the infrared ranging probe 107 to the control end of the machine body 1 will also be weakened accordingly. At this time, the control end of the machine body 1 controls the output power of the stepper motor 53 to be reduced accordingly, so the amount of consumables delivered to the inside of the print head 2 of the machine body 1 can be reduced. On the contrary, when the diameter of the consumable is too small, the control end of the machine body 1 controls the output power of the stepper motor 53 to be increased accordingly, and the amount of consumables delivered to the inside of the print head 2 of the machine body 1 is increased to ensure that the consumables can meet the current printing requirements and improve the stability and accuracy of 3D printing.When each magnetic isolation cylinder 101 moves to the position of the permanent magnetic plate 109, under the effect of like-charge repulsion, the permanent magnetic plate 109 will repel each permanent magnetic block 104, so that each damping piston 102 moves back and resets;

[0043] During the wire feeding process, the consumables will pass through the dehumidification box 111 before entering the feeding box 4. When the control end of the machine body 1 starts the modeling and printing work, the electric heater 116 and the air pump 118 will be started synchronously. The air pump 118 can transport external air to the heating box 115, and the electric heater 116 can heat the air. The heated air enters the dehumidification box 111 through the air supply hole 117 and contacts with the consumables inside the dehumidification box 111, so that the consumables can be dried (using heating and air flow to assist the rapid evaporation of water vapor that may be adsorbed on the surface of the consumables, and try to avoid the subsequent printing nozzle 2 of the machine body 1 heating the consumables, which causes the pressure inside the printing nozzle 2 to be too high, and try to avoid the escape of water vapor from the surface of the printed object, resulting in the formation of pores on the surface of the object), and then the airflow is discharged through the air outlet 119, and the preheating of the consumables by the electric heater 116 can improve the heating efficiency of the consumables by the printing nozzle 2;

[0044] When the diameter of the consumable is too large or too small, the length of the resistor sleeve 79 connected to the conductive ring 77 will change, so the resistance of the connection circuit between the resistor sleeve 79, the conductive ring 77, the normally open electromagnetic switch 127 and the normally closed electromagnetic switch 126 will also change synchronously. When the consumable diameter is qualified, the current passed into the normally closed electromagnetic switch 126 is large enough to make the moving contact of the normally closed electromagnetic switch 126 adsorbed and disconnected, while the current passed into the normally open electromagnetic switch 127 is not large enough, and the moving contact of the normally open electromagnetic switch 127 also remains disconnected. When the diameter of the consumable is too large, the length of the resistor sleeve 79 connected to the conductive ring 77 and the connection circuit between the normally open electromagnetic switch 127 and the normally closed electromagnetic switch 126 becomes shorter, so the current passed into the normally open electromagnetic switch 127 and the normally closed electromagnetic switch The current in the electromagnetic switch 126 becomes larger. At this time, the normally closed electromagnetic switch 126 will continue to absorb its own moving contact because the current is large enough, so that its own moving contact remains disconnected, and the normally open electromagnetic switch 127 will absorb and close its own moving contact because the current is large enough. After the control end of the body 1 receives the closing electrical signal of the normally open electromagnetic switch 127, the control end of the body 1 will control the normally closed electromagnetic valve 125 inside the branch hole 121 and the normally open electromagnetic valve 124 inside the air outlet 119 to be energized and work. At this time, the hot air inside the dehumidification box 111 will be discharged through the branch hole 121 and the installation pipe 122, and the temperature measuring end of the temperature detector 123 will be gradually heated. If the diameter of the consumable is too small, the normally open electromagnetic switch 127 and the normally closed electromagnetic switch 126 will be connected. The current in the dehumidifier 111 becomes smaller. At this time, the normally closed electromagnetic switch 126 will disconnect the moving contact because the current is not large enough, so that its own moving contact remains in the normally closed state, and the normally open electromagnetic switch 127 will keep its own moving contact disconnected because the current is not large enough. Therefore, the control end of the body 1 will receive the closing electrical signal of the normally closed electromagnetic switch 126. At this time, the control end of the body 1 will also control the normally open electromagnetic valve 124 and the normally closed electromagnetic valve 125 to work, and the temperature measuring end of the temperature detector 123 will also be gradually heated. Therefore, when it is detected that the diameter of the consumable is too large or too small, the hot air inside the dehumidifier box 111 will flow through the temperature detector 123. If the defective position of the consumable is shorter or less, the hot air flowing through the temperature detector 123 is less, and the temperature measuring end of the temperature detector 123 cannot be fully heated. Heat, on the contrary, if the defective positions of the consumables are long and numerous, the hot air will continue to pass through the temperature detector 123 at a high frequency, so the temperature measuring end of the temperature detector 123 will be fully heated. After the temperature detector 123 detects that the temperature has reached a threshold value (the threshold value can be set through the control end of the machine body 1 according to the heating temperature of the electric heater 116, and the heating temperature of the electric heater 116 can be set according to the consumable material used. For consumables with low melting points, the heating temperature of the electric heater 116 needs to be lowered accordingly to avoid overheating of the consumables before entering the print head 2. On the contrary, for consumables with high melting points, the heating temperature of the electric heater 116 also needs to be increased accordingly), the temperature detector 123 will output an electrical signal to the control end of the machine body 1.At this time, the control end of the machine body 1 will alert the personnel through its own alarm module (such as a buzzer), and the personnel should replace the consumables in time and trace the reasons for the excessive defects of the consumables to facilitate subsequent improvements and assist in improving the quality of 3D printing;

[0045] Among them, after the consumables are heated and dried, the consumables may generate static electricity due to friction (static electricity can affect the normal operation of the print head 2, etc.), and when the consumables pass through the steel ball 76, the static electricity on its surface will be transmitted to the grounding cable 14 through the steel ball 76 and the conductive pad 13, and then discharged through the grounding cable 14 (the end of the grounding cable 14 away from the body 1 is grounded), thereby minimizing the impact of static electricity on normal 3D printing.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A 3D rapid modeling device, comprising a body (1), a printing nozzle (2) and a discharge wheel assembly (3), wherein the printing nozzle (2) is arranged on the inner side of the body (1), and the discharge wheel assembly (3) is arranged on the back of the body (1), characterized in that: Also includes: A feed box (4) is arranged on the inner side of the machine body (1), and the feed box (4) is mounted on the back of the printing nozzle (2), and a wire feeding drive mechanism (5) is provided inside the feed box (4); A support ring (6) is mounted on the inner wall of the feeding box (4), and the support ring (6) is arranged at the discharge end of the feeding box (4), and a contact resistance adjustment mechanism (7) is provided inside the support ring (6); A mounting cover (8) is fixedly inserted into a side wall of the feed box (4); a synchronous drive mechanism (9) is provided inside the mounting cover (8) and is transmission-connected to the wire feeding drive mechanism (5); a speed regulating mechanism (10) is installed together with the synchronous drive mechanism (9) and the mounting cover (8); and a control end of the machine body (1) regulates the output power of the wire feeding drive mechanism (5) according to an electrical signal output by the speed regulating mechanism (10); A dehumidification unit (11) is mounted on the outer wall of the feeding box (4), and the dehumidification unit (11) is arranged at the feeding end of the feeding box (4). A prompting component (12) is provided inside the dehumidification unit (11), and the prompting component (12) is electrically connected to the contact resistance adjustment mechanism (7) via the control end of the machine body (1); The wire feeding drive mechanism (5) comprises a wire feeding gear (51) and a pressing wheel (52) rotatably arranged inside a feeding box (4); the pressing wheel (52) is arranged on one side of the wire feeding gear (51); a stepping motor (53) is fixedly mounted on the outer wall of the feeding box (4); an output shaft of the stepping motor (53) is transmission-connected to the wire feeding gear (51); the stepping motor (53) is electrically connected to a control end of the machine body (1); and two opposite side walls of the feeding box (4) are provided with wire holes (54); The contact resistance adjustment mechanism (7) comprises a plurality of circular grooves (71) formed on the outer wall of the support ring (6), and the bottom of each circular groove (71) is slidably connected to a T-shaped insulating rod (72), a spring (73) is fixedly provided between the T-shaped insulating rod (72) and the bottom of the circular groove (71) on the same side, a pressing block (74) is fixedly installed on one end of the T-shaped insulating rod (72) away from the circular groove (71) on the same side, and a ball groove (75) is formed on one end of the pressing block (74) away from the T-shaped insulating rod (72) on the same side, and the ball groove (75) is fixedly provided on the other end of the pressing block (74) away from the T-shaped insulating rod (72) on the same side. A steel ball (76) is rotatably provided inside the groove (75); a conductive ring (77) is fixedly sleeved on the rod wall of the T-shaped insulating rod (72); an insulating sleeve (78) is sleeved on the outer side of the conductive ring (77); and the insulating sleeve (78) is mounted on the inner wall of the support ring (6); a resistor sleeve (79) is fixedly mounted on the inner wall of the insulating sleeve (78); and the inner wall of the resistor sleeve (79) is in sliding contact with the conductive ring (77); and the resistor sleeve (79) is electrically connected to the control end of the machine body (1) through the conductive ring (77) on the same side; The synchronous drive mechanism (9) comprises a first sprocket (91) rotatably arranged inside the mounting cover (8), a second sprocket (92) is fixedly sleeved on the wheel shaft of the wire feeding gear (51), and the first sprocket (91) and the second sprocket (92) are jointly transmission-connected by a chain (93); The speed regulating mechanism (10) comprises a plurality of magnetic isolation cylinders (101) fixedly mounted on the outer wall of the chain (93), and a damping piston (102) is slidably mounted inside each magnetic isolation cylinder (101), and a non-magnetic movable rod (103) is fixedly mounted on one end of each damping piston (102) away from the chain (93), and a permanent magnet block (104) is fixedly mounted on one end of the non-magnetic movable rod (103) away from the damping piston (102) on the same side, and a micro electromagnetic push rod (105) is fixedly mounted on the inner wall of the mounting cover (8), and a permanent magnet column (104) is fixedly mounted on the telescopic end of the micro electromagnetic push rod (105). 06), an infrared ranging probe (107) is fixedly mounted on the inner wall of the mounting cover (8) on the side opposite to the permanent magnetic column (106), the micro electromagnetic push rod (105) is electrically connected to the conductive ring (77) and the resistance sleeve (79) through the control end of the body (1), a magnetic isolation slot plate (108) is mounted on the inner wall of the mounting cover (8) at a position on one side of the micro electromagnetic push rod (105), and a permanent magnetic plate (109) is mounted inside the magnetic isolation slot plate (108), and the control end of the body (1) controls the output power of the stepping motor (53) according to the strength of the electrical signal output by the infrared ranging probe (107).

2. The 3D rapid modeling device according to claim 1, characterized in that: The dehumidification unit (11) comprises a dehumidification box (111) fixedly mounted on the outer side wall of the feeding box (4); two opposite side walls of the dehumidification box (111) are provided with a circular hole (112) coaxial with the through-wire hole (54); two groups of mutually staggered elastic telescopic components (113) are provided inside the dehumidification box (111); the two groups of elastic telescopic components (113) are arranged on two opposite inner walls of the dehumidification box (111); a roller (114) is rotatably mounted at the telescopic end of each of the elastic telescopic components (113); and a dehumidification roller (114) is fixedly mounted on the outer side wall of the dehumidification box (111). A heating box (115) is provided, and an electric heater (116) is fixedly installed inside the heating box (115); the side walls of the heating box (115) and the dehumidification box (111) are jointly provided with a plurality of air supply holes (117); an air pump (118) is fixedly installed on the outer wall of the heating box (115), and the air outlet end of the air pump (118) is connected to the heating box (115); an air outlet hole (119) is provided on the side wall of the dehumidification box (111) away from the heating box (115); and the electric heater (116) and the air pump (118) are both electrically connected to the control end of the machine body (1).

3. The 3D rapid modeling device according to claim 2, characterized in that: The prompt component (12) comprises a branch hole (121) provided on a side wall of the dehumidification box (111) away from the heating box (115); a mounting pipe (122) connected to the branch hole (121) is fixedly mounted on the outer side wall of the dehumidification box (111); a temperature detector (123) is fixedly plugged into the wall of the mounting pipe (122); a temperature measuring end of the temperature detector (123) is arranged inside the mounting pipe (122); a normally open solenoid valve (124) is installed inside the air outlet hole (119); and a normally closed solenoid valve (123) is installed inside the branch hole (121). 5), a normally closed electromagnetic switch (126) and a normally open electromagnetic switch (127) are fixedly installed inside the dehumidification box (111), and the control end of the machine body (1) controls the normally open electromagnetic valve (124) and the normally closed electromagnetic valve (125) to operate according to the closing electrical signals of the normally closed electromagnetic switch (126) and the normally open electromagnetic switch (127), and the normally open electromagnetic switch (127) and the normally closed electromagnetic switch (126) are both electrically connected to the conductive ring (77) and the resistance sleeve (79) through the control end of the machine body (1), and the temperature detector (123) is electrically connected to the control end of the machine body (1).

4. The 3D rapid modeling device according to claim 1, characterized in that: A conductive pad (13) is fixedly inserted into the bottom of each ball groove (75), and the inner wall of the conductive pad (13) is in contact with the steel ball (76) on the same side. A grounding cable (14) is fixedly installed on the outer wall of the support ring (6), and each conductive pad (13) is electrically connected to the grounding cable (14).

Images