A fixing device for the material tray of a 3D printer

Abstract

The present invention provides a 3D printer tray fixing device, which inserts the tray into the mounting hole of the rack on the right side of the rack. The tray fixing device solves the problem of "empty printing" caused by excessive friction between the tray suspension and the coiling of the wire before the printing wire enters the feeder. The present invention also provides a vertical tray fixing device, which is installed on the upper edge of the rack at the top angle of the plane on the rack. The material rod of the vertical tray fixing device can be matched with the tray assembly of the aforementioned tray fixing device through simple structural changes, and can provide a smoother feeding method. At the same time, it can expand the range of wires that the 3D printer can support printing. The present invention adopts the appearance design of lotus pods and lotus flowers, which greatly improves the product characteristics and grade of the present invention while ensuring the expected protection function of the motion device.

Description

Technical Field

[0001] The present invention relates to the technical field of special fixtures, and particularly relates to a fixing device for a 3D printer material tray. Background Art

[0002] The rectangular box desktop three-dimensional printer of Raise3D adopts the fused deposition modeling technology, and stacks melted thermoplastic composite wires, such as ABS, PLA, and TPU, layer by layer into a 3D solid model. Different from traditional machining and mold casting, it can directly use CAD graphic data to additively manufacture and form solid parts, and it is easy to obtain a balance between structural complexity and weight lightening in parts manufacturing. It has a fast manufacturing speed, high precision, low price, and high ease of use.

[0003] Patent CN206544317U discloses a desktop 3D printer. The described series of models, such as Figure 1 , a material tray 7 for storing the printing wire 5 is directly hung on a material rack 9; the material rack 9 is hung on a material rack mounting hole 8 on the side of the machine frame 1. The wire 5 extends from the material tray, passes through the feeding conduit 6 on the right side of the machine frame 1, then penetrates into the feeding groove 4 above the feeding device 3, and along the guide pipe in the feeding device, through the print head material rack, the heat dissipation device and the throat pipe in the spraying device, and finally continuously falls on the printing platform 2 in the machine frame through the high-temperature nozzle 10; on the transmission path of the printing wire 5, the influence of the matching of the feeding components in the feeding device 3, the heat dissipation device in the nozzle device, the nozzle and the guiding throat pipe on the smoothness of the final continuous transmission of the wire is eliminated.

[0004] Through actual use, it is found that during the transmission of the wire 5, the friction between the feeding conduit 6 and the wire 5 is relatively large; and the configuration of the wire transmission mechanism in which the material tray 7 is hung on the material rack 9 by gravity increases the resistance of the wire passing through the feeding conduit 6; especially for a newly filled material tray, the effective continuous feeding of the wire will also increase due to the random winding of the wire 5 on the material tray 6; so that the hot-melt wire at the nozzle outlet cannot be supplied enough, thus affecting the formation of a complete formed part stack on the printing platform 2, resulting in the so-called "empty printing". Summary of the Invention

[0005] The purpose of the present invention is to provide a fixing device for a 3D printer material tray to solve the above problems, and solve the "empty printing" caused by excessive frictional forces of the material tray suspension and wire winding before the printing wire enters the feeding device.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A 3D printer material tray fixing device is used to install a material tray coiled with wire on the frame of the printer, and includes a material rod, a fixed collar, a rolling bearing, a limit collar and a tail cover; the material rod is installed on the frame, the fixed collar is inserted into the inner hole of the material tray, the rolling bearing is sleeved on the inner ring of the fixed collar, after the fixed collar and the rolling bearing are assembled on the bottom side of the material tray, the whole is sleeved on the material rod, the limit collar is sleeved on the material rod and located inside the inner hole of the material tray, and the tail cover is inserted and covered at the end of the material rod.

[0008] The device of the present invention realizes low-friction feeding of the wire coiled on the material tray by means of the small rolling friction resistance of the rolling bearing, and solves the "empty printing" and incomplete printing situations caused by excessive feeding friction resistance at the fixed part of the material tray; the stable positioning of the material rod at the lateral material rack installation opening of the frame is realized by relying on the gravity of the material tray itself and the components connected thereto.

[0009] Further, the upper section of the material rod is a shaft rod, and the bottom section of the shaft rod is a conical shaft section. The inner ring of the rolling bearing and the shaft rod of the material rod are smoothly axially sleeved in and out relative to each other by means of clearance fit. The inner ring of the rolling bearing forms a zero-clearance fit limit fastening with the conical shaft end of the material rod. There is a toothed stepped shoulder between the conical shaft section and the base of the material rod, and the lower end face of the inner ring of the rolling bearing forms an axial limit with the stepped shoulder.

[0010] Further, the lower part of the fixed collar is a flange plate with a through hole inside. The upper shaft section of the flange plate of the fixed collar is provided with a circumferential outer tooth and inner tooth structure that can bear a certain elastic deformation.

[0011] The fixed collar needs to be made of a printing material with good toughness and can withstand a certain amount of deformation and service life; the limit fixation between the inner and outer rings of the rolling bearing and their corresponding mating parts and the rotation between them are realized by relying on the elastic deformation of the conical shaft section of the material rod and the inner and outer teeth of the fixed collar.

[0012] The fixed collar is sleeved on the shaft rod of the material rod. The inner hole of the flange plate of the fixed collar is provided with a stepped groove. The rolling bearing is inserted into the inner hole of the flange of the fixed collar. The end face of its outer ring is axially stopped in the stepped groove of the fixed collar. And relying on the elastic deformation of the inner teeth of the fixed collar, the outer ring of the rolling bearing forms a circumferential zero-clearance fit limit with the inner teeth of the fixed collar.

[0013] The flange at the lower end of the fixed collar is provided with a fixed step, and a radially protruding convex structure, namely a fixed convex point, is circumferentially arranged on the countersunk head section. The rolling bearing is inserted into the inner hole at the lower end of the fixed collar, and the outer ring of the rolling bearing of the rolling bearing forms a zero-clearance fit with the circumferential fixed convex points of the fixed collar. At the same time, the end face of the outer ring of the rolling bearing abuts against the fixed step, thereby realizing the axial and circumferential limitation and fixation of the rolling outer ring relative to the fixed collar.

[0014] Further, the shaft end at the upper end of the fixed collar is inserted into its inner hole from the bottom of the material tray. The flange step of the fixed collar restricts the axial relative position of the material tray. At the same time, the external teeth of the fixed collar rely on their elastic deformation to form a circumferential zero-clearance fit and limit with the inner hole wall of the material tray.

[0015] Further, circular through holes for lightening are axially and circumferentially opened in the limit collar. The limit collar and the end cap are successively sleeved on the material rod. The lower end face of the limit collar abuts against the top end face of the inner ring of the rolling bearing.

[0016] The material tray is an off-the-shelf standard part with fixed dimensions, and the dimensions of the limit collar can be adjusted to adapt to material trays of different specifications and thicknesses.

[0017] The lower part of the end cap is a smooth shaft for inserting into the blind hole at the head of the material rod. The upper part of the end cap is provided with a cross-shaped rotating handle for conveniently screwing it into the blind hole of the material rod. The limit between the smooth shaft and the blind hole is realized by a small clearance fit. The upper end face of the limit collar abuts against the bottom end face of the cross-shaped rotating handle of the end cap.

[0018] Further, a cross beam for storing printing materials is provided on the side of the frame. Material rack mounting holes are arranged on the cross beam. The material rod is installed in the material rack mounting holes on the side of the frame. The base of the material rod is provided with a semi-circular base foot, namely the material rod base foot. After the semi-circular base foot of the material rod is aligned and inserted into the rectangular material rack mounting hole, it can form a butt joint and insertion bite with the long side of a rectangular hole plate with a certain thickness by relying on the material foot hook groove provided on the material rod base foot, thereby realizing the positioning of the material rod for bearing the load of the material tray on the frame.

[0019] Further, the material rod is vertically and vertically installed on the frame through a material seat, and a lotus guard ring is also provided at the lower end of the material rod.

[0020] The circumferential direction of the lotus guard ring is provided with a petal-shaped structure for shielding the fixed collar and the rolling bearing sleeved on the material rod. The upper end of the petal is provided with a convex point. The lower disk bottom surface of the material tray is provided with a circumferential material tray end face groove.

[0021] The convex points of the circular convex point structure form point contacts with the grooves on the end face of the lower plate of the tray; the friction between the tray and the lobe ends of the lotus-shaped retaining ring is reduced, thereby achieving the control of the yaw of the rotating tray by the lotus-shaped retaining ring.

[0022] Furthermore, a sunken groove is provided on the inner ring of the lotus-shaped retaining ring, through holes and radial slot holes are opened on the groove surface, and a limiting boss is provided on the upper plane of the seat. By aligning the through hole of the lotus-shaped retaining ring with the limiting boss of the seat, the radial limit between the lotus-shaped retaining ring and the seat is achieved;

[0023] Two countersunk through holes are opened on the groove surface of the lotus-shaped retaining ring, and two threaded holes are provided on the upper plane of the seat. The lotus-shaped retaining ring is axially fixed on the seat by screws;

[0024] A groove and a semi-circular foot of the material rod are provided at the lower end of the material rod; the foot of the material rod of the material rod is inserted into the special-shaped through hole of the lotus-shaped retaining ring in alignment, and the engagement is achieved through the radial relative docking insertion of the groove of the material rod and the radial slot hole of the lotus-shaped retaining ring.

[0025] Furthermore, the device is also provided with a wire blocking assembly. The wire blocking assembly includes a wire blocking fan blade, a hexagonal pillar, a nut, a washer and a wire blocking screw. The wire blocking fan blade is fixedly connected to the hexagonal pillar by a thread, and the wire blocking screw passes through the washer and the nut in sequence and is then screwed tightly on the hexagonal pillar;

[0026] A front seat plate and a wire blocking pull rod are arranged between the wire blocking assembly and the seat. The front seat plate is arranged on the front end face of the seat. A stepped end face and a seat boss are provided on the front end face of the seat,

[0027] A fixing pedestal for fixing the wire blocking assembly is provided on the side of the wire blocking pull rod,

[0028] A toothed T-shaped rack is longitudinally arranged on the wire blocking pull rod. The rack is movably installed in the T-shaped groove of the front seat plate and can move longitudinally.

[0029] The wire blocking fan blade is composed of a wire blocking blade and a wire blocking support shaft. The wire blocking support shaft is located at the lower end of the wire blocking fan blade; by adjusting the relative position of the wire blocking pull rod and the front seat plate, the control of the gap between the wire blocking cone rod of the wire blocking fan blade and the edge of the tray of the tray can be achieved;

[0030] The design of the slidable friction that can be pulled out between the wire blocking pull rod and the seat can avoid the interference between the tray and the wire blocking blade when the tray is assembled on the tray fixing device, improving the ease of assembly.

[0031] Further, after the wire blocking screw sequentially passes through the fixed pedestal, washer and nut of the wire blocking pull rod, it is locked with the threaded hole at the bottom of the hexagonal support pillar. The wire blocking screw is configured with a certain screw rod length, and the nut can axially move vertically on the reserved length of the screw rod of the wire blocking screw; between the upper end surface of the nut and the bottom of the hexagonal support pillar, by adjusting the relative vertical position of the nut on the screw rod of the wire blocking screw, the gap between the lower edge of the wire blocking blade and the inner disk surface of the upper end surface of the lower disk of the material tray can be controlled.

[0032] Driven by the feeding device, the wire drives the material tray around which it is coiled to rotate. The wire uncoiled from the material tray can have a line contact with the wire blocking blade of the wire blocking assembly; the wire blocking fan blade rotates under the action of friction, and the washer reduces the rotational friction between the lower end surface of the nut and the upper end surface of the fixed pedestal of the wire blocking pull rod.

[0033] The nut, wire blocking screw assembly and wire blocking pull rod hinge assembly configured for the wire blocking assembly are mainly used to limit the increase in the coiling bending radius of the end section of the wire uncoiled from the material tray by the wire blocking blade at the end of the wire blocking assembly connected to the wire blocking pull rod; to prevent the wire from coiling out of the bottom plate of the material tray through the gap between the wire blocking blade and the material tray when the wire is rotated with the material tray to convey the wire to the feeding device, and then coiling and jamming on other structural parts of the present invention located below the material tray.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. A rolling bearing is assembled on the bottom side of the material tray. By means of the small rolling friction resistance of the rolling bearing, low-friction feeding of the wire coiled on the material tray is realized, effectively solving the "empty printing" and incomplete printing situations caused by excessive feeding friction resistance at the fixed part of the material tray. The stable positioning of the material rod at the lateral material rack mounting opening of the rack is achieved by relying on the gravity of the material tray itself and the components connected thereto.

[0036] 2. The upper shaft section of the flange of the fixed collar is provided with circumferential external teeth and internal teeth structures that can bear a certain elastic deformation. The inner and outer rings of the rolling bearing and their corresponding mating parts are limited and fixed and rotated therebetween by relying on the elastic deformation of the tapered shaft section of the material rod and the internal and external teeth of the fixed collar.

[0037] 3. A lotus guard ring is provided at the lower end of the material rod. The lotus guard ring is circumferentially provided with petal-shaped structures for shielding the fixed collar and the rolling bearing sleeved on the material rod; convex points are provided at the upper end of the petals, and a circumferential material tray end face groove is provided on the bottom surface of the lower disk of the material tray. Point contact is formed by the convex points of the circular convex point structure and the material tray end face groove of the lower disk of the material tray; the friction between the material tray and the end of the petal of the lotus guard ring is reduced, and the yaw control of the rotating material tray by the lotus guard ring is realized.

[0038] 4. Set up a wire blocking component, which includes a wire blocking fan blade, a hexagonal pillar, a nut, a washer, and a wire blocking screw. Driven by the feeding device, the wire drives the coil it winds around to rotate. The wire uncoiled from the coil can have a line contact with the wire blocking fan blade of the wire blocking component. The wire blocking fan blade rotates under the action of friction, realizing the limitation of the increase in the winding bending radius of the uncoiled end segment of the wire wound on the coil by the wire blocking blade at the end of the wire blocking component connected to the wire blocking pull rod, and avoiding the wire from passing through the gap between the wire blocking blade and the coil when the wire is transported to the feeding device by rotating with the coil, thus winding and jamming on other structural components of the present invention located below the coil. Description of the Drawings

[0039] Figure 1 It is an enlarged schematic diagram of the fixing implementation method of the coil of the existing model;

[0040] In the figure, 1 - frame; 3 - feeding device; 4 - feeding chute; 5 - wire; 6 - feeding conduit; 7 - coil; 8 - coil mounting hole; 9 - coil rack;

[0041] Figure 2 It is an enlarged three - dimensional schematic diagram of the coil fixing device of the present invention;

[0042] In the figure, 100 - coil rack assembly.

[0043] Figure 3 It is an enlarged three - dimensional exploded structure schematic diagram of the assembly sequence of the coil rack assembly of the coil fixing device of the present invention;

[0044] In the figure, 103 - end cap; 104 - limit collar; 105 - rolling bearing Ⅰ; 106 - fixed collar Ⅰ; 108 - rod Ⅰ.

[0045] Figure 4 It is a partial assembly three - dimensional schematic diagram of the coil rack assembly of the coil fixing device of the present invention;

[0046] In the figure, 115 - outer ring of the rolling bearing; 125 - inner ring of the rolling bearing; 116 - external teeth of the fixed collar; 118 - bottom foot of the rod; 126 - internal teeth of the fixed collar; 128 - rod foot groove; 136 - inner edge of the fixed collar;

[0047] Figure 5 It is a schematic diagram of the vertical coil fixing implementation method of the present invention;

[0048] In the figure, 21 - upper edge of the frame; 211 - coil seat; 300 - wire blocking component.

[0049] Figure 6 It is a three - dimensional exploded structure schematic diagram of the assembly sequence of the vertical coil fixing device of the present invention;

[0050] In the figure, 203 - lotus root end cap; 205 - rolling bearing II; 206 - fixed collar II; 208 - material rod II; 209 - lotus guard; 210 - screw; 212 - front seat plate; 213 - front seat plate screw; 214 - LOGO panel; 215 - wire blocking pull rod; 301 - wire blocking fan blade; 302 - hexagonal pillar; 303 - nut; 304 - washer; 305 - wire blocking screw.

[0051] Figure 7 It is a three - dimensional schematic diagram of the partial assembly relationship of the vertical material tray fixing device of the present invention;

[0052] In the figure, 221 - limit boss; 228 - material foot bottom foot; 231 - threaded hole; 241 - base groove;

[0053] Figure 8 It is a three - dimensional schematic diagram of the partial assembly relationship of the vertical material tray fixing device of the present invention;

[0054] In the figure, 73 - inner hole wall of the material tray; 216 - external thread of fixed collar II.

[0055] Figure 9 It is a three - dimensional schematic diagram of the partial structure of the vertical material tray fixing device of the present invention;

[0056] Figure 10 It is a partial sectional view of the vertical material tray fixing device of the present invention;

[0057] In the figure, 51 - wire I; 52 - wire II; 71 - end face groove of the material tray; 72 - inner disk surface of the material tray; 74 - edge of the material tray; 216 - external thread of fixed collar II; 219 - dewdrop of the guard; 311 - wire blocking taper rod; 321 - wire blocking blade. Specific embodiments

[0058] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0059] As Figure 1, A 3D printer model is described. The spool 7 for storing the printing wire 5 is directly hung on the material rack 9, and the material rack 9 is hung on the material rack mounting hole 8 on the side of the machine frame 1. The wire 5 extends from the spool, passes through the feeding conduit 6 on the right side of the machine frame 1, then penetrates into the feeding groove 4 above the feeding device 3, and along the material guiding tube in the feeding device, passes through the nozzle holder, the heat dissipation device and the throat tube in the material spraying device, and finally continuously falls on the printing platform located inside the machine frame through the high-temperature nozzle. On the transmission path of the printing wire 5, the influence of the matching of the feeding components in the feeding device 3, the heat dissipation device in the nozzle device, the nozzle and the guiding throat tube on the smoothness of the final continuous transmission of the wire is eliminated. Through actual use, it is found that: during the transmission of the wire 5, the friction force between the feeding conduit 6 and the wire 5 is relatively large; and the configuration of the wire transmission mechanism in which the spool 7 is hung on the material rack 9 by gravity increases the resistance of the wire passing through the feeding conduit 6; especially for a newly filled spool, the effective continuous conveying of the wire will also be increased due to the random winding of the wire 5 on the spool 6; so that the molten wire at the nozzle outlet does not get enough supply, thus affecting the formation of a complete formed part stack on the printing platform and causing the so-called "empty printing".

[0060] In order to overcome the above problems, the present invention provides a suitable spool fixing device to solve the problems of excessive load and transmission delay caused by wire coiling friction and self-weight before the printing wire enters the feeding device; effectively reduce the probability of "empty printing".

[0061] The present invention provides a spool fixing device, that is, a spool assembly 100, as Figure 2 shown, the spool assembly 100 and the spool 7 and the material rack mounting hole 8 form a wire transmission fixing system.

[0062] As Figure 3 , the spool assembly 100 includes: a tail cover 103, a limiting collar Ⅰ 104, a rolling bearing Ⅰ 105, a fixing collar Ⅰ 106 and a material rod 108.

[0063] The wire 5 is coiled on the spool 7; the spool 7 is hung on the material rack mounting hole 8 on the side of the machine frame 1 by relying on the material rod Ⅰ 108; the fixing collar Ⅰ 104 is inserted into the inner hole of the spool 7, and the rolling bearing Ⅰ is sleeved on the inner ring of the fixing collar Ⅰ; after the fixing collar Ⅰ and the rolling bearing Ⅰ are assembled on the bottom side of the spool 7, the whole is sleeved on the material rod 108; then, the limiting collar 104 is sleeved on, and finally, the tail cover 103 is inserted and covered at the end of the material rod 108.

[0064] On the right side of the frame 1, there is a crossbeam for storing printing materials. A rectangular hole, namely the material rack mounting hole 8, is opened on the crossbeam. The base of the material rod I 108 is provided with a semi-circular base foot, namely the material rod base foot 128. After the semi-circular base foot of the material rod I 108 is aligned and inserted into the rectangular material rack mounting hole 8, it can rely on the material foot hook groove 128 provided on the material rod base foot to form a butt joint insertion and bite with the long side of a rectangular hole plate with a certain thickness, so as to realize the positioning of the material rod I 108 carrying the load of the material tray on the frame 1.

[0065] The rolling bearing I 105 is composed of an inner ring 125, an outer ring 115 and balls; as Figure 4 , the upper section of the material rod I 108 is a shaft rod, and the bottom section of the shaft rod is a conical section, namely the conical shaft section 118. A smooth relative axial insertion and extraction can be realized between the inner ring of the rolling bearing I 105 and the shaft rod of the material rod I 108 by relying on clearance fit; and the inner ring 125 of the rolling bearing I 105 can form a zero-clearance fit limit fastening with the conical shaft end 118 of the material rod I 108.

[0066] The lower part of the fixed collar I 106 is a flange plate with a through hole inside; the upper shaft section of the flange plate of the fixed collar I 106 is provided with circumferential inner and outer tooth-shaped structures, namely the outer teeth 116 and the inner teeth 126, which can bear a certain elastic deformation; the fixed collar I 106 can be sleeved on the shaft rod of the material rod I 108; the inner hole of the flange plate of the fixed collar I 106 is provided with a stepped groove 136; the rolling bearing I 105 can be inserted into the inner hole of the flange of the fixed collar I 106, and the end face of its outer ring 116 is axially positioned in the stepped groove 136 of the fixed collar I 106; at the same time, relying on the elastic deformation of the inner teeth of the fixed collar I 106, a circumferential zero-clearance fit limit is formed between the outer ring of the rolling bearing I 105 and the inner teeth 126 of the fixed collar I 106;

[0067] The upper shaft end of the fixed collar I 106 can be inserted into its inner hole from the bottom of the material tray 7; the flange step 146 of the fixed collar I 106 can limit the axial relative position between the fixed collar I 106 and the material tray 7; at the same time, the outer teeth 116 of the fixed collar I 106 can rely on its elastic deformation to form a circumferential zero-clearance fit limit with the inner hole arm 73 of the material tray 7 of the material tray 7.

[0068] The limiting collar 104 is axially and axially provided with lightweight circular through holes; after the material tray 7 sleeved with the rolling bearing I 105 and the fixed collar I 106 is sleeved on the material rod I 108, the limiting collar 104 and the end cap 103 can be successively sleeved on the material rod I 108; the lower end face of the limiting collar 104 is positioned at the top end face of the inner ring 125 of the rolling bearing I;

[0069] The lower part of the tail cover 103 is a optical axis for inserting into the blind hole at the head of the material rod I 108; the upper part of the tail cover 103 is provided with a cross handle that can be conveniently screwed into the blind hole of the material rod I 108; the optical axis and the blind hole can be limited and fastened by relying on a small clearance fit; the upper end surface of the limit collar 104 can stop at the bottom end surface of the cross handle of the tail cover 103;

[0070] The material tray is an externally purchased standard part with fixed dimensions, and the dimensions of the limit collar 104 can be adjusted to adapt to material trays of different specifications and thicknesses;

[0071] Compared with the material rack 9 of the original model, the material tray fixing device mainly realizes the low-friction feeding of the wire 5 wound around the material tray 7 by means of the small rolling friction resistance of the rolling bearing I 105; at the same time, relying on the elastic deformation of the tapered shaft section 118 of the material rod 108 and the internal teeth 126 and external teeth 116 of the fixed collar I 106, the inner and outer rings of the rolling bearing are limited and fixed with their corresponding mating parts and the rotation between them is realized.

[0072] The technical solution provided by the above invention has completely solved the "empty printing" and incomplete printing situations caused by excessive feeding friction resistance at the material tray fixing position through long-term testing.

[0073] Relying on the gravity of the material tray 7 itself and the components connected to it, the stable positioning of the material rod I 108 at the lateral material rack installation opening 8 of the frame is realized;

[0074] All components of the material tray assembly 100 can be additively manufactured by 3D printing of this model, with low processing costs;

[0075] The fixed collar I 106 needs to be made of a printing material with better toughness and can withstand a certain amount of deformation and service life.

[0076] In actual applications, this series of models can support the printing of conventional thermoplastic materials such as PLA, ABS, and PC, and also support the printing of flexible wire TPU; due to the flexible nature of the TPU wire itself, tests have confirmed that the aforementioned invention technical solution I cannot provide a smoother feeding method for its printing.

[0077] Reference Figure 5 , the present invention provides another technical solution II: providing a vertical material tray fixing device, as Figure 5 , mainly composed of a material seat 211, a wire blocking component 300, and a material rack component 200;

[0078] The material seat 211 is installed at the top corner position of the front touch screen of the frame 1; there is a circumferentially surrounding protruding edge on the upper end surface of the frame 1, that is, the upper frame edge 21, and the material seat 211 is provided with a corresponding groove, that is, the seat groove 241; the docking and insertion fit of the protruding edge and the groove can realize the relative vertical direction limit fixation of the material seat 211 and the upper end surface of the frame;

[0079] As shown in Figure 6 , the rack assembly 200 mainly includes: a lotus tail cover 203, a rolling bearing II 205, a fixing collar II 206, a rod II 208, and a lotus guard 209.

[0080] As shown in Figure 7 , the lotus guard 209 is located between the rack assembly 200 and the seat 211; the inner ring of the lotus guard 209 is provided with a sunk groove, and a special-shaped through hole and a radial slot hole are opened on the groove surface; the upper plane of the seat 211 is provided with a crescent-shaped boss, that is, a limit boss 221; aligning the special-shaped through hole of the lotus guard 209 with the crescent-shaped limit boss 221 of the seat 211 can realize the radial limit of the lotus guard 209 and the seat 211;

[0081] Two countersunk through holes are opened on the groove surface of the lotus guard 209; two threaded holes 231 are provided on the upper plane of the seat 211; the lotus guard 209 can be axially fixed on the seat 211 by relying on the screw 210;

[0082] The upper plane of the seat 211 is also provided with a lightweight through hole.

[0083] As shown in Figure 7 , the lower end base of the rod II 208 is provided with a groove and a semi-circular rod foot 228; the semi-circular rod foot 228 of the rod II 208 can be inserted into the special-shaped through hole of the lotus guard 209 in alignment, and can be inserted and engaged by the radial relative docking insertion of the groove of the rod II 208 and the radial slot hole of the lotus guard 209; it can be clearly found from the Figure 7 front view in that: the lotus tail cover 203 at the upper end of the rod II 208 has a certain eccentricity relative to the axis of the guard 209;

[0084] Similar to the rod assembly 100 in the foregoing technical solution, the assembly method of the rod assembly 200 in another technical solution provided by the present invention is: first, the fixing collar II 206 is sleeved into the inner hole of the feed tray 7, then the rolling bearing II 205 is sleeved into the inner ring of the fixing collar II 206 from below, and then, the fixed bearing II 205 sleeving the feed tray 7 and the fixing collar II 206 is sleeved on the shaft rod of the rod II 208; finally, the lotus tail cover 203 is inserted into the upper hole of the rod II 208;

[0085] As shown in Figure 8 , the fixing collar II 206 is a flange structure with a through hole in the middle; a flange step 246; external teeth II 216 evenly distributed axially on the upper shaft section of the flange structure; the fixing collar II 206 is inserted into the inner hole of the feed tray 7, and the zero-clearance fit with the inner hole wall 73 of the feed tray is realized by using the slight elastic deformation of the external teeth 216 of the fixing collar II 206; at the same time, the flange step 246 limits the axial relative position of the feed tray 7 and the fixing collar II 206;

[0086] The flange lower end of the fixed collar II 206 is provided with a countersunk step, namely the fixed step 256; a radially protruding convex structure is circumferentially arranged on the countersunk section, namely the fixed convex point 236; the rolling bearing II 205 is inserted into the inner hole at the lower end of the fixed collar II 206, and a zero-clearance fit is formed between the outer ring 205 of the rolling bearing II 205 and the circumferential fixed convex point 236 of the fixed collar II 206; meanwhile, the end face of the outer ring 215 of the rolling bearing II 205 abuts against the fixed step 256; thus, the axial and circumferential relative limitation and fixation of the rolling outer ring 215 relative to the fixed collar II 206 are realized.

[0087] There is a certain clearance between the upper shaft diameter of the material rod II 208 and the outer ring of the rolling bearing II 205, and the rolling bearing II 205 can be easily sleeved on the material rod II 208; a tapered shaft section is provided on the lower shaft diameter section of the material rod II 208, namely the material rod taper 218; a toothed step is provided between the material rod taper 218 and the base of the material rod II 208, namely the stepped shoulder 238; the inner ring 225 of the rolling bearing II 205 of the sleeved material tray 7 and the fixed collar II 206 can form a zero-clearance fit limit with the taper 218 of the material rod II 208; the lower end face of the inner ring 225 of the rolling bearing can form an axial limit with the stepped shoulder 238.

[0088] Such as Figure 6 , the wire blocking assembly 300 includes: a wire blocking fan blade 301, a hexagonal pillar 302, a nut 303, a washer 304 and a wire blocking screw 305; the wire blocking fan blade 301 is fixedly connected to the hexagonal pillar 302 by threads; the wire blocking screw 305 passes through the washer 304 and the nut 303 in sequence and is then screwed tightly on the hexagonal pillar 302.

[0089] A front seat plate 212 and a wire blocking pull rod 215 are arranged between the wire blocking assembly 300 and the material seat 211; the front seat plate 212 is arranged on the front end face of the material seat 211; the front end face of the material seat 211 is provided with a stepped end face and a circular material seat boss 221; a threaded hole is provided at the center of the material seat boss 221; a circular groove is provided on the back side of the front seat plate 215; while the groove of the front seat plate 212 is sleeved on the material seat boss 221 of the material seat 211, the left end face of the front seat plate 212 and the stepped end face of the material seat 211 are aligned, so as to realize the limitation of the relative rotation and translation of the front seat plate 212 relative to the material seat 211.

[0090] The front seat plate 215 is fixed to the material seat 211 by the panel screw 213; the length of the threaded rod of the panel screw 213 is a little longer than the sum of the thicknesses of the front seat plate 215 and the front panel of the material seat 211; the panel screw 213 passes through the material seat 211 and can be screwed to the front side 31 of the frame 1, and the part of the threaded rod of the panel screw 213 protruding from the material seat 211 fills the gap between the upper edge 21 of the frame and the material seat groove 241, thus realizing the fastening of the material seat 211 and the frame 1.

[0091] The panel screw 213 for fixing the front panel 212 of the fixing base on the material base 211 can be covered with zero clearance in front of the front panel 212 of the base through the LOGO panel 214 provided with corresponding blind holes;

[0092] Such as Figure 9 , a fixing pedestal for fixing the wire blocking assembly 300 is provided on the right side of the wire blocking pull rod 215; a through hole for limiting the horizontal movement of the wire blocking screw 305 in the vertical direction is provided on the fixing pedestal; the wire blocking pull rod 215 is hinged to the wire blocking assembly 300 through the wire blocking screw 305;

[0093] A toothed T-shaped slide rod, that is, a toothed rod 235, is longitudinally arranged on the wire blocking pull rod 215; the slide rod can move longitudinally in the T-shaped groove of the front panel 212 of the base; the wire blocking fan blade 301 is composed of a wire blocking blade 321 and a wire blocking support shaft, and the wire blocking support shaft is located at the lower end of the wire blocking fan blade 301, and a tapered shaft section, that is, a wire blocking tapered rod 311, is provided on the rotating shaft section; by adjusting the relative position of the wire blocking pull rod 215 with respect to the front panel 212 of the base, the gap between the wire blocking tapered rod 311 of the wire blocking fan blade 301 and the edge 74 of the material tray 7 of the material tray can be controlled;

[0094] The design of the slidable sliding friction between the wire blocking pull rod 215 and the material base 211 can avoid the interference between the material tray 7 and the wire blocking blade 321 when the material tray 7 is assembled on the material tray fixing device II, improving the ease of assembly;

[0095] After the wire blocking screw 305 passes through the fixing pedestal of the wire blocking pull rod 215, the washer 304 and the nut 303 in sequence; it is locked with the threaded hole at the bottom of the hexagonal pillar 302. The wire blocking screw 305 is configured with a certain screw length, and the nut 303 can move vertically axially on the reserved length of the screw of the wire blocking screw 305; between the upper end surface of the nut 305 and the bottom of the hexagonal pillar 302, by adjusting the relative vertical position of the nut 303 on the screw of the wire blocking screw 305, the gap between the lower edge of the wire blocking blade 321 and the inner surface 72 of the material tray of the upper end surface of the lower disc of the material tray 7 can be controlled;

[0096] The wire 5 drives the coiled material tray 7 to rotate under the drive of the feeding device; the wire II 52 unrolled from the material tray 7 can have a line contact with the wire blocking blade 321 of the wire blocking assembly 300; the wire blocking fan blade 301 rotates under the action of friction, and the washer 304 reduces the rotational friction between the lower end surface of the nut 303 and the upper end surface of the fixing pedestal of the wire blocking pull rod 215;

[0097] The nut 303, the wire stop screw 305 assembly, and the wire stop pull rod 215 hinge assembly configured for the wire stop assembly 300 are mainly used to limit the increase in the coiling bending radius of the exposed end segment of the wire 5 coiled on the upper platter 7 by the wire stop blade 321 at the end of the wire stop assembly 300 connected to the wire stop pull rod 215; to prevent the wire Ⅰ51 from passing through the gap between the wire stop blade 321 and the platter 7 as the platter 7 rotates to convey the wire to the feeding device 3, and thus coiling around and jamming on other structural components of the present invention located below the platter 7;

[0098] In the part printing of the components configured in the vertical platter fixing device Ⅱ of the present invention, the wire 5 coiled on the platter 7 drives the platter 7 to rotate under the drive of the feeding device 3; the platter 7 will undergo a slight yaw under the torque action of the wire 5.

[0099] To reduce the possible adverse risks that such yaw may bring to other components, the present invention provides a technical solution Ⅲ: As Figure 10 , the circumferential direction of the lotus guard 209 is provided with a petal-shaped structure, which is mainly used to shield the fixing collar Ⅱ206 and the rolling bearing Ⅱ205 sleeved on the rod Ⅱ208; the upper end of the petal is provided with a bump, namely the guard dew 219; the lower platter bottom surface of the platter 7 is provided with a circumferential groove, namely the platter end face groove 71; during the rotation and yaw of the platter 7, the point contact formed by the guard dew 219 with a circular bump structure and the platter end face groove 71 of the lower platter of the platter 7 is utilized; to reduce the friction between the platter 7 and the petal end of the lotus guard 209; thereby realizing the control of the yaw of the rotating platter 7 by the lotus guard 209;

[0100] The tail rod of the lotus-shaped end cap 203 is inserted into the rod Ⅱ208 provided with a blind hole, which not only completes the assembly of the platter fixing device but also presents an overall decorative style in contrast with the lotus guard 209;

[0101] Minor changes can be made to the stepped shoulder 238 of the rod Ⅱ208 in the technical solution Ⅱ of the present invention to achieve mutual matching with the rod Ⅰ108 in the technical solution Ⅰ of the present invention.

[0102] The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and use the invention. Obviously, those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative labor. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present invention according to the disclosure of the present invention should be within the protection scope of the present invention.

Claims

1. A fixing device for the material tray of a 3D printer, which is used to install the material tray wound with wire on the frame of the printer. Characterized in that, It includes a material rod, a fixed collar, a rolling bearing, a limit collar and a tail cover; The material rod is installed on the frame, the fixed collar is inserted into the inner hole of the material tray, the rolling bearing is sleeved on the inner ring of the fixed collar, and after the fixed collar and the rolling bearing are assembled on the bottom side of the material tray, the whole is sleeved on the material rod, the limit collar is sleeved on the material rod and is located inside the inner hole of the material tray, and the tail cover is inserted and covered at the end of the material rod; The upper section of the material rod is a shaft rod, and the bottom section of the shaft rod is a tapered shaft section. The inner ring of the rolling bearing and the shaft rod of the material rod rely on clearance fit to achieve smooth relative axial insertion and extraction, and the inner ring of the rolling bearing forms a zero-clearance fit limit fastening with the tapered shaft end of the material rod; The lower part of the fixed collar is a flange plate, which is provided with a through hole inside. The upper shaft section of the flange plate of the fixed collar is provided with a circumferential outer tooth and inner tooth structure that can bear a certain elastic deformation. The fixed collar is sleeved on the shaft rod of the material rod. The inner hole of the flange plate of the fixed collar is provided with a stepped groove. The rolling bearing is inserted into the inner hole of the flange of the fixed collar, and the end face of its outer ring is axially stopped in the stepped groove of the fixed collar. And relying on the elastic deformation of the inner teeth of the fixed collar, the outer ring of the rolling bearing forms a circumferential zero-clearance fit limit with the inner teeth of the fixed collar.

2. A fixing device for the material tray of a 3D printer according to claim 1, Characterized in that, The upper shaft end of the fixed collar is inserted into its inner hole from the bottom of the material tray. The flange step of the fixed collar limits the relative axial position of the material tray. At the same time, the outer teeth of the fixed collar rely on their elastic deformation to form a circumferential zero-clearance fit limit with the inner hole wall of the material tray.

3. A fixing device for the material tray of a 3D printer according to claim 2, Characterized in that, The axial and circumferential directions of the limit collar are provided with lightweight circular through holes. The limit collar and the tail cover are successively sleeved on the material rod, and the lower end face of the limit collar is stopped at the top end face of the inner ring of the rolling bearing; The lower part of the tail cover is a smooth shaft for inserting into the blind hole at the head of the material rod. The upper part of the tail cover is provided with a cross-shaped rotating handle for conveniently screwing it into the blind hole of the material rod. The smooth shaft and the blind hole rely on a small clearance fit to achieve limit fastening; the upper end face of the limit collar is stopped at the bottom end face of the cross-shaped rotating handle of the tail cover.

4. A fixing device for the material tray of a 3D printer according to any one of claims 1-3, Characterized in that, A cross beam for storing printing materials is provided on the side of the frame, and a material rack mounting hole is provided on the cross beam. The material rod is installed in the material rack mounting hole on the side of the frame.

5. A fixing device for the material tray of a 3D printer according to any one of claims 1-3, Characterized in that, The material rod is vertically installed on the frame through a material seat, and a lotus guard ring is also provided at the lower end of the material rod. The circumferential direction of the lotus guard ring is provided with petal-shaped structures for shielding the fixed collar and the rolling bearing sleeved on the material rod; convex points are arranged at the upper ends of the petals, and a circumferential material tray end face groove is arranged on the bottom surface of the lower tray of the material tray.

6. A 3D printer material tray fixing device according to claim 5, characterized in that a sunken groove is arranged on the inner ring of the lotus guard ring, through holes and radial slot holes are arranged on the groove surface, a limiting boss is arranged on the upper plane of the material seat, and the through hole of the lotus guard ring is aligned with the limiting boss of the material seat to realize the radial limit between the lotus guard ring and the material seat; a groove and a semi-circular material foot bottom foot are arranged at the lower end of the material rod; the material foot bottom foot of the material rod is inserted into the special-shaped through hole of the lotus guard ring in alignment, and the groove of the material rod and the radial slot hole of the lotus guard ring are inserted in a radially opposite manner to realize biting.

7. A 3D printer material tray fixing device according to claim 5, characterized in that the device is further provided with a wire blocking assembly, and the wire blocking assembly includes a wire blocking fan blade, a hexagonal pillar, a nut, a washer and a wire blocking screw. The wire blocking fan blade and the hexagonal pillar are fixedly connected by threads, and the wire blocking screw passes through the washer and the nut in sequence and is then screwed onto the hexagonal pillar; a front seat plate and a wire blocking pull rod are arranged between the wire blocking assembly and the material seat. The front seat plate is arranged on the front end face of the material seat. A stepped end face and a material seat boss are arranged on the front end face of the material seat. A fixing pedestal for fixing the wire blocking assembly is arranged on the side of the wire blocking pull rod; a toothed T-shaped rack is longitudinally arranged on the wire blocking pull rod, and the rack is movably installed in the T-shaped groove of the front seat plate and can move longitudinally; the wire blocking fan blade is composed of a wire blocking blade and a wire blocking support shaft. The wire blocking support shaft and the hexagonal pillar are fixedly connected by threads, and the wire blocking blade is arranged on the wire blocking support shaft along the circumferential direction.

8. A 3D printer material tray fixing device according to claim 7, characterized in that after passing through the fixing pedestal, the washer and the nut of the wire blocking pull rod in sequence, the wire blocking screw is locked with the bottom threaded hole of the hexagonal pillar. The wire blocking screw is configured with a certain screw rod length, and the nut can move vertically axially on the reserved length of the screw rod of the wire blocking screw; between the upper end face of the nut and the bottom of the hexagonal pillar, by adjusting the relative vertical position of the nut on the screw rod of the wire blocking screw, the control of the gap between the lower edge of the wire blocking blade and the inner disk surface of the upper end face of the lower disk of the material tray can be realized.

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