Feeding mechanism of 3D printing device

Abstract

The invention relates to a feeding mechanism of a 3D printing device, and provides the following scheme aiming at the problem of feeding interruption caused by a material arching phenomenon easily occurring in a feeding process in the prior art: the feeding mechanism comprises a hopper main body of a square funnel-shaped structure with an upward flaring on the whole; the hopper main body sequentially comprises a rectangular large frame, a conical horn frame and a square tube bottom frame which are welded together from top to bottom, four conveying mechanisms which are distributed in a central symmetry mode are fixed to the outer side surface of the conical horn frame of the hopper main body, and each conveying mechanism comprises a first conveying rack which is fixed to the portion, close to the top end, of the outer wall of the rectangular large frame; a second conveying rack is fixed to the side, away from the first conveying rack, of the square pipe bottom frame of the hopper body. When materials are leaked, the materials attached to the inner wall of the conical horn frame of the hopper body are pulled downwards in an inclined mode, the materials are matched with a plurality of conveying belts arranged in the same direction, the whole material leakage mode can be made to leak downwards towards the center of a square pipe bottom frame below in a vortex shape, and therefore the arching phenomenon is prevented.

Description

Technical Field

[0001] The present invention relates to the field of 3D printing, and in particular to a feeding mechanism for a 3D printing device. Background Art

[0002] 3D printing is a rapid prototyping technology. It is based on digital model files, uses powdered metal or plastic particles as raw materials, and continuously supplies the printer with them to construct objects by printing layer by layer. 3D printing is usually achieved using digital technology material printers. It is often used to make models in the fields of mold manufacturing, industrial design, etc., and later gradually used for the direct manufacturing of some products. There are already parts printed using this technology.

[0003] After searching, it is found that the feeding device of the existing 3D printing equipment will inevitably cause the material to arch when the particle size of the material is too large or too small, the viscosity is medium or above, the humidity is high, and the storage time is long. The compaction force and adhesion force between the materials will be greater than the free gravity, which will inevitably lead to the interruption of material supply and even cause vacancies in the printed object. Therefore, we propose a feeding mechanism that can prevent the material from arching when unloading. Summary of the invention

[0004] The present invention aims at solving the technical problems existing in the prior art and provides a feeding mechanism for a 3D printing device.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: a feeding mechanism of a 3D printing device, comprising a hopper body with an overall flared upward square funnel-shaped structure, the hopper body being a rectangular large frame, a conical horn frame and a square tube bottom frame welded together from top to bottom, and four conveying mechanisms symmetrically distributed in the center are fixed on the outer surface of the conical horn frame of the hopper body, the conveying mechanism comprising a conveying frame 1 fixed to the outer wall of the rectangular large frame near the top, a conveying frame 2 is fixed on the side of the square tube bottom frame of the hopper body away from the conveying frame 1, and upper rollers and lower rollers parallel to each other are respectively arranged on the conveying frame 1 and the conveying frame 2, and the axis lines of the upper roller and the lower roller are parallel to the plane where the outer inclined surface of the conical horn frame between the two rollers is located, and the same conveyor belt is wound between the outer walls of the roller bodies of the upper roller and the lower roller; and one of the straight sections of the conveyor belt passes through the hopper body and slides obliquely downward on the inner wall of the conical horn frame; rectangular oblique through holes are opened at the edges of the conical horn frame of the hopper body near the upper and lower ends. A further configuration of the present invention is that a control panel is fixed on the front side of the hopper body near the top, and three vertically arranged shaft rod frames and a U-shaped fixing seat are fixed on the four vertical outer edges of the rectangular frame of the hopper body; the U-shaped fixing seat is located at a corner near the rear side, and a dual-output shaft motor is fixed in the U-shaped fixing seat, and vertical and mutually parallel transmission rods are rotatably connected in the other three shaft rod frames, and driven pulleys are fixed on the top of the transmission rods; a driving pulley is fixed on the top output shaft end of the dual-output shaft motor; and the circumferential outer walls of the driving pulley and the three driven pulleys A same toothed transmission belt is wound between them; bevel gear 1 is fixed to the bottom output shaft end of the dual-output shaft motor and the bottom ends of the three transmission rods; an extended shaft rod coaxial with the upper roller is fixed to the top of the four upper rollers, and a bevel gear 2 is fixed to the top of the extended shaft rod, and the bevel gear 2 is arc-shapedly meshed with the corresponding bevel gear 1; through the toothed transmission belt and bevel gear 2, when it is necessary to drive the four conveyor belts to operate simultaneously, it is only necessary to control the dual-output shaft motor to start, and the two output shafts of the dual-output shaft motor turn in opposite directions to ensure that the four conveyor belts can be transported from top to bottom to assist in material leakage.

[0006] A further configuration of the present invention is that an anti-warping guard plate is fixed above the inner wall of the hopper body near the edge of the conveyor belt, and the longitudinal section of the anti-warping guard plate is an L-shaped structure, which protects the conveyor belt from top to bottom to prevent the sliding material from drilling into the gap between the conveyor belt and the hopper body to jam the conveyor belt, thereby ensuring that the conveyor belt always remains tightly attached to the inner wall of the conical horn frame of the hopper body during the transmission process, and also ensuring that the conveyor belt surfaces at the four side walls have a consistent traction effect on the material downward, thereby ensuring that the material discharge speed on all sides is consistent.

[0007] A further configuration of the present invention is that the side of the conveyor belt away from the upper roller, i.e., the side close to the material, is provided with V-shaped grooves distributed at equal distances. By providing the V-shaped grooves on the surface of the conveyor belt, the roughness of the surface of the conveyor belt can be increased, thereby increasing the friction force during traction and increasing the traction effect on the material.

[0008] The present invention is further configured in that a crossbeam plate seat extending to the middle is fixed on the top of the hopper body near the upper part of the U-shaped fixed seat, and a bearing mounting hole is opened at one end of the crossbeam plate seat near the center of the hopper body, and a sliding bearing is embedded and fixed in the bearing mounting hole, and a vertical impact blowpipe is slidably connected in the middle of the sliding bearing; the lower half of the impact blowpipe is arranged in an S-shaped structure, and the bottom end of the impact blowpipe extends into the middle of the square tube bottom frame at the bottom end of the hopper body; a fixed support block is sleeved and fixed at the circumferential edge of the top end of the impact blowpipe, and a moving magnetic ring 2 is fixed at the top end of the fixed support block; an annular baffle is sleeved and fixed on the circumferential outer wall of the moving magnetic ring 2, and a magnet ring 1 is fixed on the upper surface of the crossbeam plate seat above the bearing mounting hole, and the magnetic poles of the upper surface of the magnet ring 1 are opposite to the magnetic poles of the lower surface of the moving magnetic ring 2, that is, under normal circumstances, the moving magnetic ring 2 will be tightly adsorbed on the upper surface of the magnet ring 1; a bearing fixing frame is fixed on the upper surface of the crossbeam plate seat near the magnet ring , and two symmetrical tapered roller bearings are clamped in the bearing fixing frame, and the same rotating shaft rod is rotatably connected between the two tapered roller bearings, and a toggle wheel is fixed to the end of the rotating shaft rod close to the magnet ring one, and a toggle handle is fixed to the circumferential outer wall of the toggle wheel, and a resist wheel is arranged at the end of the toggle handle away from the rotating shaft rod; the diameter of the annular baffle is greater than the diameter of the magnet ring one; when the toggle wheel rotates, the toggle handle will drive the toggle handle to rotate to the side close to the magnet ring one, and when the toggle handle rotates to the side close to the magnet ring one, the annular baffle will be picked up together with the moving magnetic ring two at first, and the impact blowpipe inserted into the material will be lifted at this time, and with the continued rotation of the toggle wheel, the toggle handle will rotate out of the restriction range of the annular baffle, at this time, under the combined effect of the suction of the moving magnetic ring two and the magnet ring one and the gravity, the impact blowpipe will drop rapidly, and the S-shaped structure of the lower part of the impact blowpipe can assist in breaking the arch phenomenon, so as to guide the material to fall and complete the leakage.

[0009] A further configuration of the present invention is that a plurality of power grids distributed in a centrally symmetrical manner are fixed to the circumferential outer wall of one end of the rotating shaft rod away from the toggle wheel; and a supporting platform is fixed to the top of the side of the hopper body close to the power grid, and a feeding mechanism is arranged on the top of the supporting platform; the discharge end of the feeding mechanism is located above the power grid on one side of the rotating shaft rod; through the cooperation of the arranged power grid and the feeding mechanism, rotational power can be provided for the toggle wheel when adding raw materials.

[0010] A further configuration of the present invention is that an L-shaped baffle is fixed to the top of the beam plate seat near the toggle wheel, and a magnet ring three parallel to and concentric with the magnet ring one is fixed to the lower surface of the top of the L-shaped baffle; the magnetic poles on the lower surface of the magnet ring three are the same as the magnetic poles on the upper surface of the moving magnetic ring two; when the moving magnetic ring two and the impact blowpipe are lifted to the top, a repulsive force is generated, and at this time, the impact blowpipe is accelerated to move downward at the moment the lifting force is withdrawn.

[0011] A further configuration of the present invention is that a side baffle is fixed to the upper surface of the crossbeam plate seat at one side edge close to the power grid plate, and a rotating hole matching the diameter of the rotating shaft rod is opened in the middle of the side baffle.

[0012] A further configuration of the present invention is that a piston bellows with an opening upward and an overall barrel-shaped structure is fixed to the top of the impact blow pipe, an exhaust pipe is inserted into the barrel bottom of the piston bellows, and a one-way air outlet valve is fixed to the bottom end of the exhaust pipe, a piston disk is slidably connected to the circumferential inner wall of the piston bellows, and a push rod and a return spring are respectively fixed to the upper and lower ends of the piston disk; an electric heating ring with an annular structure is fixed to the lower surface of the piston disk; the bottom end of the impact blow pipe is closed, and a plurality of blowing holes are opened on the outer wall of the impact blow pipe near the bottom end; a plurality of centripetally distributed spoke rods are fixed to the top of the piston bellows, and the same wear-resistant sliding sleeve is fixed between the plurality of spoke rods, and the push rod is slidably sleeved in the wear-resistant sliding sleeve; two annular grooves are opened on the circumferential outer wall of the piston disk, and one-way sealing leather rings are sleeved in both annular grooves.

[0013] A further configuration of the present invention is that a plurality of triangular inclined plates are fixed near the bottom end of the circumferential outer wall of the impact blow pipe, and the triangular inclined plates are inclined and distributed in a spiral shape; by arranging the triangular inclined plates distributed in a centrally symmetrical manner, a blocking force can be generated during the falling process to drive the impact blow pipe to produce a slight rotation, and cooperate with the S-shaped structural section in the middle to produce an impact on materials in different directions.

[0014] The beneficial effects of the present invention are: BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a three-dimensional structural schematic diagram of the hopper body and one of the conveying mechanisms in the present invention; Figure 3 It is a schematic diagram of the overall structure of the rear side of the present invention; Figure 4 A top view of the present invention; Figure 5 It is a front view of the present invention; Figure 6 It is a schematic diagram of the overall structure of one of the transmission mechanisms in the present invention; Figure 7 For the present invention Figure 4 Schematic diagram of the cross-sectional structure along line AA; Figure 8 For the present invention Figure 7 A schematic diagram of the enlarged structure at B in the middle; Fig. 9 It is a schematic diagram of the overall structure when the impact blowpipe in the present invention is in a low position; Fig.10It is a schematic cross-sectional view of the piston air cylinder before being compressed in the present invention; Fig.11 It is a schematic diagram of the cross-sectional structure of the piston air cylinder under pressure in the present invention.

[0015] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Hopper body; 2. Anti-warping guard plate; 3. Toothed transmission belt; 4. Conveyor frame 1; 5. Transmission rod; 6. Control panel; 7. Conveyor belt; 8. Conveyor frame 2; 9. Extended shaft; 10. Bevel gear 1; 11. Bevel gear 2; 12. Driven pulley; 13. Dual output shaft motor; 14. U-shaped fixing seat; 15. Power grid; 16. Feeding mechanism; 17. Rotating shaft rod; 18. L-shaped baffle; 19. Impact blowpipe; 191. Blow hole; 1 92. Triangular inclined plate; 20. Rectangular oblique through hole; 21. Shaft rod frame; 22. Lower roller; 23. Upper roller; 24. Magnet ring one; 25. Annular baffle plate; 26. Moving magnetic ring two; 27. Magnet ring three; 28. Steering wheel; 2801. Steering handle; 29. ​​Side baffle plate; 30. Crossbeam plate seat; 3001. Sliding bearing; 31. Piston air cylinder; 32. Piston disc; 33. Reset spring; 34. One-way air outlet valve; 35. Electric heating ring; 36. Push rod. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0017] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0018] In the description of the present application, the term "for example" is used to mean "used as an example, illustration or description". Any embodiment described as "for example" in the present application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is given to enable any technician in the field to implement and use the present invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present invention can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid unnecessary details to obscure the description of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.

[0019] Example 1 Please refer to Figure 1-6 The hopper body 1 is an overall flared upward square funnel-shaped structure, and the hopper body 1 is composed of a large rectangular frame, a conical horn frame and a square tube bottom frame welded together from top to bottom, and four conveying mechanisms symmetrically distributed in the center are fixed on the outer surface of the conical horn frame of the hopper body 1, characterized in that the conveying mechanism includes a conveying frame 1 4 fixed to the outer wall of the large rectangular frame near the top, a conveying frame 2 8 is fixed on the side of the square tube bottom frame of the hopper body 1 away from the conveying frame 1 4, and upper rollers 23 and lower rollers 22 parallel to each other are respectively arranged on the conveying frame 1 4 and the conveying frame 2 8, and the axis of the upper roller 23 and the lower roller 22 is oblique to the outer surface of the conical horn frame between the two. The planes where the surfaces are located are parallel to each other, and the same conveyor belt 7 is wound between the outer walls of the roller bodies of the upper roller 23 and the lower roller 22; and one straight section of the conveyor belt 7 passes through the hopper body 1 and slides obliquely downward on the inner wall of the conical horn frame; rectangular oblique through holes 20 are opened near the upper and lower ends of the edges of the conical horn frame of the hopper body 1, and by arranging the conveyor belt 7 spirally distributed on the inner wall of the hopper body 1, the material pressed against the inner wall of the conical horn frame of the hopper body 1 can be inclinedly pulled downward when leaking, and with the help of multiple conveyor belts 7 arranged in the same direction, the overall leakage method can be spirally leaked to the center of the square tube bottom frame below, thereby preventing the occurrence of arching.

[0020] Example 2 Please refer to Figure 1-11A control panel 6 is fixed on the front of the hopper body 1 near the top, and three vertically arranged shaft rod frames 21 and a U-shaped fixing seat 14 are fixed on the four vertical outer edges of the rectangular frame of the hopper body 1; the U-shaped fixing seat 14 is located at a corner near the rear side, and a dual-output shaft motor 13 is fixed in the U-shaped fixing seat 14, and the remaining three shaft rod frames 21 are rotatably connected with vertical and mutually parallel transmission rods 5, and the top of the transmission rod 5 is fixed with a driven pulley 12; a driving pulley is fixed to the top output shaft end of the dual-output shaft motor 13; and the same root is wound between the circumferential outer walls of the driving pulley and the three driven pulleys 12. Toothed transmission belt 3; bevel gear 10 is fixed to the bottom output shaft end of the dual output shaft motor 13 and the bottom ends of the three transmission rods 5; the top ends of the four upper rollers 23 are fixed with an extended shaft rod 9 coaxial with the upper roller 23, and the top ends of the extended shaft rod 9 are fixed with a bevel gear 2 11, and the bevel gear 2 11 is arc-shapedly meshed with the corresponding bevel gear 10; through the set toothed transmission belt 3 and bevel gear 2 11, when it is necessary to drive the four conveyor belts 7 to operate simultaneously, it is only necessary to control the dual output shaft motor 13 to start, and the two output shafts of the dual output shaft motor 13 turn in opposite directions to ensure that the four conveyor belts 7 can be transported from top to bottom to assist in leaking materials.

[0021] Please refer to Figure 4 and Figure 7 An anti-warping guard plate 2 is fixed on the upper side of the inner wall of the hopper body 1 near the edge of the conveyor belt 7, and the longitudinal section of the anti-warping guard plate 2 is an L-shaped structure, which protects the conveyor belt 7 from top to bottom to prevent the sliding material from drilling into the gap between the conveyor belt 7 and the hopper body 1 to jam the conveyor belt 7, thereby ensuring that the conveyor belt 7 always remains in close contact with the inner wall of the conical horn frame of the hopper body 1 during the conveying process, and also ensuring that the conveyor belt 7 surface at the four side walls has a consistent traction effect on the material downward, thereby ensuring that the material discharge speed on all sides is consistent.

[0022] In this solution, the side of the conveyor belt 7 away from the upper roller 23, i.e., the side close to the material, is provided with equidistantly distributed V-shaped grooves. By providing the V-shaped grooves on the surface of the conveyor belt 7, the roughness of the surface of the conveyor belt 7 can be increased, thereby increasing the friction force during traction and increasing the traction effect on the material.

[0023] Please refer to Figure 7-Figure 11A crossbeam plate seat 30 extending to the middle is fixed on the top of the hopper body 1 near the U-shaped fixed seat 14, and a bearing mounting hole is opened at one end of the crossbeam plate seat 30 near the center of the hopper body 1, and a sliding bearing 3001 is embedded and fixed in the bearing mounting hole, and a vertical impact blowpipe 19 is slidably connected in the middle of the sliding bearing 3001; the lower half of the impact blowpipe 19 is set in an S-shaped structure, and the bottom end of the impact blowpipe 19 extends into the middle of the square tube bottom frame at the bottom end of the hopper body 1, which can prevent the material from entering the thin neck section to produce an arching phenomenon when leaking; A fixed support block is sleeved and fixed at the circumferential edge of the top of the blow pipe 19, and a moving magnetic ring 26 is fixed to the top of the fixed support block; an annular baffle 25 is sleeved and fixed to the circumferential outer wall of the moving magnetic ring 26, and a magnet ring 1 24 is fixed on the upper surface of the crossbeam plate seat 30 located above the bearing mounting hole, and the magnetic pole of the upper surface of the magnet ring 1 24 is opposite to the magnetic pole of the lower surface of the moving magnetic ring 26, that is, under normal circumstances, the moving magnetic ring 26 will be tightly adsorbed on the upper surface of the magnet ring 1 24; a bearing fixing frame is fixed on the upper surface of the crossbeam plate seat 30 near the magnet ring 1 24, and the shaft Two symmetrical tapered roller bearings are clamped in the bearing fixing frame, and the same rotating shaft rod 17 is rotatably connected between the two tapered roller bearings. A toggle wheel 28 is fixed to the end of the rotating shaft rod 17 close to the magnet ring 24, and a toggle handle 2801 is fixed to the circumferential outer wall of the toggle wheel 28. A toggle wheel is arranged at the end of the toggle handle 2801 away from the rotating shaft rod 17; the diameter of the annular baffle 25 is larger than the diameter of the magnet ring 24; when the toggle wheel 28 rotates, the toggle handle 2801 will be driven to rotate to the side close to the magnet ring 24, and when the toggle handle 2801 rotates When it reaches the side close to the magnet ring 1 24, the annular baffle 25 will be lifted up together with the moving magnetic ring 2 26 first. At this time, the impact blowpipe 19 inserted into the material will be lifted up. With the continued rotation of the toggle wheel 28, the toggle handle 2801 will rotate out of the restriction range of the annular baffle 25. At this time, under the combined effect of the suction of the moving magnetic ring 26 and the magnet ring 1 24 and the gravity, the impact blowpipe 19 will drop rapidly. The S-shaped structure of the lower part of the impact blowpipe 19 can help break the arch phenomenon, guide the material to fall, and complete the leakage.

[0024] Please refer to Figure 9-11 A plurality of power grid plates 15 symmetrically distributed in the center are fixed to the circumferential outer wall of one end of the rotating shaft rod 17 away from the driving wheel 28; and a supporting platform is fixed to the top of the side of the hopper body 1 close to the power grid plate 15, and a feeding mechanism 16 is arranged on the top of the supporting platform; the discharging end of the feeding mechanism 16 is located above the power grid plate 15 on one side of the rotating shaft rod 17; through the cooperation of the set power grid plate 15 and the feeding mechanism 16, the driving wheel 28 can be provided with rotational power when adding raw materials.

[0025] Please refer to Figure 9-11An L-shaped baffle 18 is fixed to the top of the crossbeam plate seat 30 near the toggle wheel 28, and a magnet ring three 27 parallel to and concentric with the magnet ring one 24 is fixed to the lower surface of the top of the L-shaped baffle 18; the magnetic poles on the lower surface of the magnet ring three 27 are the same as the magnetic poles on the upper surface of the moving magnetic ring two 26; when the moving magnetic ring two 26 and the impact blowpipe 19 are lifted to the top, a repulsive force will be generated, and at this time, the impact blowpipe 19 will be accelerated to move downward at the moment the lifting force is withdrawn.

[0026] Please refer to Fig.11 A side baffle 29 is fixed to the upper surface of the beam plate seat 30 near the edge of one side of the power grid plate 15. The side baffle 29 has a rotating hole in the middle that matches the diameter of the rotating shaft rod 17, which can prevent the material from falling on the top of the beam plate seat 30 when falling.

[0027] Please refer to Figure 7-Figure 11 The top of the impact blow tube 19 is fixed with a piston air cylinder 31 with an opening upward and a barrel-shaped structure as a whole. An exhaust pipe is inserted into the barrel bottom of the piston air cylinder 31, and a one-way air outlet valve 34 is fixed to the bottom end of the exhaust pipe. A piston disc 32 is slidably connected to the inner wall of the piston air cylinder 31, and a push rod 36 and a return spring 33 are respectively fixed to the upper and lower ends of the piston disc 32; an annular electric heating ring 35 is fixed to the lower surface of the piston disc 32; the bottom end of the impact blow tube 19 is closed, and a plurality of blowing holes 19 are opened on the outer wall of the impact blow tube 19 near the bottom end 1; a plurality of spoke rods distributed centripetally are fixed to the top of the piston air cylinder 31, and a same wear-resistant sleeve is fixed between the plurality of spoke rods, and the top rod 36 is slidably sleeved in the wear-resistant sleeve; two annular grooves are formed on the circumferential outer wall of the piston disc 32, and one-way sealing leather rings are sleeved in both annular grooves; through the arranged piston air cylinder 31 and the blowing hole 191, when the impact blow pipe 19 is driven to move upward, hot gas can be squeezed and blown out from the blowing hole 191 at the bottom at the same time, so as to dry the agglomerated material and prevent the material from agglomerating.

[0028] Please refer to Fig. 9 A plurality of triangular inclined plates 192 are fixed near the bottom end of the circumferential outer wall of the impact blow pipe 19, and the triangular inclined plates 192 are distributed in a spiral shape. By arranging the triangular inclined plates 192 distributed symmetrically with the center, a blocking force can be generated during the falling process to drive the impact blow pipe 19 to produce a slight rotation, and cooperate with the S-shaped structural section in the middle to produce an impact on materials in different directions.

[0029] When the device is in use: first adjust the unloading position of the loading mechanism 16 to ensure that the discharging end of the loading mechanism 16 is located above the power grid plate 15 on one side of the rotating shaft rod 17; to provide rotational power for the toggle wheel 28 when adding raw materials; by setting a conveyor belt 7 spirally distributed on the inner wall of the hopper body 1, start the double output shaft motor 13 in the U-shaped fixed seat 14 when leaking, and then drive the four conveying mechanisms to operate. At this time, as the conveyor belt 7 at the inner wall of the hopper body 1 runs downward at the same time, the material pressed against the inner wall of the conical horn frame of the hopper body 1 is tilted and pulled downward, and with the cooperation of multiple conveyor belts 7 arranged in the same direction, the overall leakage method can be spirally leaked to the center of the square tube bottom frame below to prevent the occurrence of arching; at the same time, when the toggle handle 2801 is rotated to When it approaches one side of the magnet ring 1 24, the annular baffle 25 will be lifted up together with the moving magnetic ring 2 26 first. At this time, the impact blowpipe 19 inserted into the material will be lifted up. With the continued rotation of the toggle wheel 28, the toggle handle 2801 will rotate out of the restriction range of the annular baffle 25. At this time, under the combined effect of the suction of the moving magnetic ring 26 and the magnet ring 1 24 and gravity, the impact blowpipe 19 will drop rapidly. The S-shaped structure of the lower part of the impact blowpipe 19 can help break the arch phenomenon, guide the material to fall, and complete the leakage. At the same time, through the piston air cylinder 31 and the blowing hole 191, when the impact blowpipe 19 is driven to move upward, the hot gas is squeezed and blown out from the blowing hole 191 at the bottom to dry the agglomerated material and prevent the material from agglomerating.

[0030] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0031] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A feeding mechanism for a 3D printing device, comprising a hopper body (1) in the shape of a square funnel with an expanded opening facing upward, wherein the hopper body (1) is composed of a rectangular large frame, a conical horn frame and a square tube bottom frame welded together from top to bottom, and four conveying mechanisms distributed symmetrically with respect to the center are fixed on the outer surface of the conical horn frame of the hopper body (1), characterized in that: The conveying mechanism comprises a conveying frame 1 (4) fixed to the outer wall of the rectangular large frame near the top, a conveying frame 2 (8) is fixed to the side of the square tube bottom frame of the hopper body (1) away from the conveying frame 1 (4), and the conveying frame 1 (4) and the conveying frame 2 (8) are respectively provided with upper rollers (23) and lower rollers (22) parallel to each other, and the axis lines of the upper rollers (23) and the lower rollers (22) are parallel to the plane where the outer inclined surface of the conical horn frame between the two rollers is located, and the same conveying belt (7) is wound between the outer walls of the roller bodies of the upper rollers (23) and the lower rollers (22); and one straight section of the conveying belt (7) passes through the hopper body (1) and slides obliquely downward along the inner wall of the conical horn frame; rectangular oblique through holes (20) are opened at the edges of the conical horn frame of the hopper body (1) near the upper and lower ends.

2. A 3D printing device feeding mechanism according to claim 1, characterized in that: A control panel (6) is fixed on the front side of the hopper body (1) near the top, and three vertically arranged shaft rod frames (21) and a U-shaped fixing seat (14) are fixed on four vertical outer edges of the rectangular frame of the hopper body (1); the U-shaped fixing seat (14) is located at a corner near the rear side, and a dual-output shaft motor (13) is fixed in the U-shaped fixing seat (14), and vertical and mutually parallel transmission rods (5) are rotatably connected to the other three shaft rod frames (21), and the top of the transmission rod (5) is fixed with a driven pulley (12); the top output shaft end of the dual-output shaft motor (13) is fixed with a driving pulley; and the driving pulley A common toothed transmission belt (3) is wound between the circumferential outer walls of the pulley and the three driven pulleys (12); a bevel gear 1 (10) is fixed to the bottom output shaft end of the dual-output shaft motor (13) and the bottom ends of the three transmission rods (5); an extended shaft (9) coaxial with the upper roller (23) is fixed to the top of each of the four upper rollers (23), and a bevel gear 2 (11) is fixed to the top of each of the extended shafts (9), and the bevel gear 2 (11) is arc-meshed with the corresponding bevel gear 1 (10); the two output shafts of the dual-output shaft motor (13) rotate in opposite directions to ensure that the four conveyor belts (7) can be transported from top to bottom to assist in material leakage.

3. A feeding mechanism for a 3D printing device according to claim 2, characterized in that: An anti-warping guard plate (2) is fixed above the edge of the inner wall of the hopper body (1) close to the conveyor belt (7), and the longitudinal section of the anti-warping guard plate (2) is an L-shaped structure.

4. A 3D printing device feeding mechanism according to claim 3, characterized in that: The side of the conveyor belt (7) away from the upper roller (23), i.e., the side close to the material, is provided with V-shaped grooves distributed at equal distances.

5. A 3D printing device feeding mechanism according to claim 4, characterized in that: A crossbeam plate seat (30) extending toward the middle is fixed to the top of the hopper body (1) near the U-shaped fixed seat (14), and a bearing mounting hole is formed at one end of the crossbeam plate seat (30) near the center of the hopper body (1), and a sliding bearing (3001) is embedded and fixed in the bearing mounting hole, and a vertical impact blow pipe (19) is slidably connected to the middle of the sliding bearing (3001); the lower half of the impact blow pipe (19) is arranged in an S-shaped structure, and the bottom end of the impact blow pipe (19) extends into the middle of the square tube bottom frame at the bottom end of the hopper body (1); a fixed support block is sleeved and fixed at the circumferential edge of the top of the impact blow pipe (19), and a moving magnetic ring (26) is fixed to the top of the fixed support block; an annular baffle (25) is sleeved and fixed to the circumferential outer wall of the moving magnetic ring (26), and the upper surface of the crossbeam plate seat (30) is located above the bearing mounting hole and fixed. A magnet ring (24) is provided, wherein the magnetic poles on the upper surface of the magnet ring (24) are opposite to the magnetic poles on the lower surface of the moving magnet ring (26); a bearing fixing frame is fixed on the upper surface of the crossbeam plate seat (30) near the magnet ring (24), and two symmetrical tapered roller bearings are clamped in the bearing fixing frame, and a same rotating shaft rod (17) is rotatably connected between the two tapered roller bearings; a toggle wheel (28) is fixed on one end of the rotating shaft rod (17) near the magnet ring (24), a toggle handle (2801) is fixed on the circumferential outer wall of the toggle wheel (28), and a stop wheel is provided on one end of the toggle handle (2801) away from the rotating shaft rod (17); the diameter of the annular baffle (25) is larger than the diameter of the magnet ring (24); when the toggle wheel (28) rotates, it drives the toggle handle (2801) to rotate to a side near the magnet ring (24).

6. A 3D printing device feeding mechanism according to claim 5, characterized in that: A plurality of power grid plates (15) distributed symmetrically in the center are fixed to the circumferential outer wall of one end of the rotating shaft rod (17) away from the toggle wheel (28); a support plate is fixed to the top of one side of the hopper body (1) close to the power grid plate (15); a feeding mechanism (16) is arranged at the top of the support plate; and a discharge end of the feeding mechanism (16) is located above the power grid plate (15) on one side of the rotating shaft rod (17).

7. A 3D printing device feeding mechanism according to claim 6, characterized in that: An L-shaped baffle (18) is fixed to the top of the crossbeam plate seat (30) near the toggle wheel (28), and a magnet ring three (27) parallel to and concentric with the magnet ring one (24) is fixed to the lower surface of the top of the L-shaped baffle (18); the magnetic poles on the lower surface of the magnet ring three (27) are the same as the magnetic poles on the upper surface of the moving magnet ring two (26).

8. A feeding mechanism for a 3D printing device according to claim 7, characterized in that: A side baffle (29) is fixed to the upper surface of the crossbeam plate seat (30) at one side edge close to the power grid plate (15), and a rotation hole matching the diameter of the rotating shaft rod (17) is opened in the middle of the side baffle (29).

9. A 3D printing device feeding mechanism according to claim 7, characterized in that: A piston air cylinder (31) with an opening upward and a barrel-shaped structure as a whole is fixed at the top of the impact blow pipe (19); an exhaust pipe is inserted into the barrel bottom of the piston air cylinder (31), and a one-way air outlet valve (34) is fixed at the bottom end of the exhaust pipe; a piston disc (32) is slidably connected to the circumferential inner wall of the piston air cylinder (31), and a push rod (36) and a return spring (33) are respectively fixed at the upper and lower ends of the piston disc (32); an annular electric heating ring (35) is fixed to the lower surface of the piston disc (32); the bottom end of the impact blow pipe (19) is closed, and a plurality of blowing holes (191) are formed on the outer wall of the impact blow pipe (19) near the bottom end; a plurality of spoke rods distributed centripetally are fixed at the top of the piston air cylinder (31), and a common wear-resistant sliding sleeve is fixed between the plurality of spoke rods, and the push rod (36) is slidably sleeved in the wear-resistant sliding sleeve; two annular grooves are formed on the circumferential outer wall of the piston disc (32), and a one-way sealing leather ring is sleeved in both the two annular grooves.

10. A feeding mechanism for a 3D printing device according to claim 9, characterized in that: A plurality of triangular inclined plates (192) are fixed to the circumferential outer wall of the impact blow pipe (19) near the bottom end, and the triangular inclined plates (192) are distributed in a spiral shape.

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