Wax mold 3D printing device for investment casting

Abstract

The invention relates to the technical field of investment casting, in particular to a wax pattern 3D printing device for investment casting, which comprises a printing head for stacking and discharging materials layer by layer, a heater for heating the discharged materials is connected to the bottom end of the printing head, a discharging pipe barrel for discharging columnar materials is connected below the heater, and a cutting board for transversely cutting the columnar materials is arranged at the bottom end of the discharging pipe barrel. One end of the cutting board is connected with an outer shaft tool, the upper end of the outer shaft tool is connected with a driving energy supply power mechanism, the printing head is internally provided with a barrel cavity used for containing the power mechanism, the power mechanism comprises a barrel frame device, a power collecting ring tool and a braking ring tool, the power collecting ring tool and the braking ring tool are distributed in the barrel frame device and used for collecting power, and the printing head capable of continuously discharging pauses or changes the direction in the wandering process. The transverse cutting of the cutting board can be automatically triggered when the wax material is laid, so that the wax material discharged from the discharging pipe barrel is prevented from being connected with the laid wax material, the problem that foreign matters on the local surface protrude due to connection on the surface of the produced 3D product is solved, and the appearance of the obtained 3D product is more exquisite.

Description

Technical Field

[0001] The invention relates to the technical field of investment casting, and in particular to a wax pattern 3D printing device for investment casting. Background Art

[0002] Investment casting uses a disposable fusible wax material as a model, and then repeatedly applies multiple layers of special refractory coating on the wax model to form a mold shell. After the mold shell hardens, the wax model is melted in steam and hot water. During the wax model 3D printing process, the printing discharge head moves quickly, continuously discharging viscous wax material during the movement, and the viscous wax material is spread out. The spread out multi-layer material is stacked layer by layer. When the material hardens, the formed 3D wax model is completed. Since the wax material is soft and sticky when spread out, there is material viscosity involvement, especially at the movement node position of the printing discharge head. Based on the purpose of eliminating the adhesion involvement of the wax material, the present invention provides a wax model 3D printing device for investment casting. Summary of the invention

[0003] The object of the present invention is to provide a wax pattern 3D printing device for investment casting to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a 3D printing device for wax molds for investment casting, comprising a print head for stacking and discharging materials in layers, the bottom end of the print head is connected to a heater for heating the discharging materials, and a discharging tube for discharging columnar materials is connected below the heater, and a knife plate for cross-cutting the columnar materials is arranged at the bottom end of the discharging tube, one end of the knife plate is connected to an outer shaft, and the upper end of the outer shaft is connected to a driving energy supply power mechanism, a barrel cavity for a built-in power mechanism is arranged in the print head, and the power mechanism comprises a barrel frame device, a gathering ring device for collecting power distributed in the barrel frame device, and a brake ring device for releasing power, a brake ring device is transmission-connected to the bottom of the gathering ring device, and the brake ring device is transmission-connected to the outer shaft device, and the barrel frame device supports the gathering ring device and the brake ring device.

[0005] The cylinder rack device includes a transverse ring body, a plurality of columns vertically arranged on the transverse ring body, a plurality of guide square tubes fixedly arranged in the transverse ring body, an L-shaped lifting plate sliding through each guide square tube, and a pull-back spring piece connected to the bottom end of the L-shaped lifting plate, one end of the pull-back spring piece is fixed on the guide square tube, and the other end is fixed on the L-shaped lifting plate.

[0006] The external shaft comprises a short shaft, an oblique shaft, a fixed shaft plate and an external control shaft, one end of the fixed shaft plate is fixed on the print head, the short shaft and the oblique shaft are respectively movably sleeved in two through holes opened in the fixed shaft plate, one end of the external control shaft is meshed and driven with a fixed bevel gear and a bevel gear fixed at one end of the oblique shaft, the other end of the external control shaft extends into the print head and is transmission-connected with a brake ring, the other end of the oblique shaft is meshed and driven with a fixed bevel gear and a bevel gear fixed at one end of the short shaft, and the other end of the short shaft is fixed on the knife plate.

[0007] The movable ring device includes a heavy ring cylinder, a trapezoidal cylinder, a fixed ring cylinder, a buffer unit, a ring plate gear and a lap joint device. A shaking heavy ring cylinder is arranged inside the fixed ring cylinder, and the outside of the fixed ring cylinder is fixedly connected to a column. A plurality of buffer units are evenly arranged on the fixed ring cylinder, and the plurality of buffer units cooperate to support the heavy ring cylinder. A trapezoidal cylinder for collision transmission is distributed above the middle of the heavy ring cylinder, and a ring plate gear is arranged below the fixed ring cylinder. One end of the lap joint device is transmission-connected to the ring plate gear, and the other end is transmission-connected to the brake ring device. One end of the L-shaped lifting plate is fixedly connected to the trapezoidal cylinder.

[0008] The buffer unit includes a unit spring piece, a unit rack, a split shaft, a unit frame, a one-way bearing and a ring gear. The unit rack slides through a plate hole opened on the fixed ring cylinder, one end of the unit rack is inserted into an annular groove set on the outer wall of the heavy ring cylinder, one end of the split shaft is connected by meshing transmission with the unit rack through a fixed gear, one end of the unit spring piece is fixed on the unit rack, and the other end is fixed on the fixed ring cylinder, the other end of the split shaft is fixedly sleeved with a one-way bearing, the outside of the one-way bearing is sleeved with a ring gear, the ring gear and the ring plate gear are meshed and connected, the split shaft is movably sleeved in a through hole opened on the unit frame, one end of the unit frame is fixed on the fixed ring cylinder, and the inner edge of the ring plate gear is stuck in the groove opened on the unit frame.

[0009] The lap joint device includes a head shaft, a lap joint frame, a tripod, a C-shaped spring clip, a tail shaft and a worm. One end of the lap joint frame is fixed on a fixed ring cylinder. The head shaft, the tail shaft and the worm are respectively movably sleeved in three through holes opened on the lap joint frame. One end of the head shaft is connected by meshing transmission with a fixed gear and a ring plate gear. A tripod is fixed on the other end of the lap joint frame. A plurality of C-shaped spring clips are evenly arranged and fixed on the tripod. The C-shaped spring clips are inserted into an arc groove opened on the outer wall of one end of the tail shaft. The other end of the tail shaft is connected by meshing transmission with a fixed bevel gear and a bevel gear fixed at one end of the worm.

[0010] The brake ring comprises a barrel assembly, a clamping ring and a reciprocating device. The barrel assembly is connected to the worm gear in a transmission manner. A clamping ring is arranged on the outer ring of the barrel assembly. A reciprocating device is connected to the outer control shaft in a transmission manner.

[0011] The barrel group includes a first outer gear ring, a mainspring, an L-shaped support plate and a positioning drum. A positioning drum is arranged inside the first outer gear ring, a mainspring is connected between the positioning drum and the first outer gear ring, a plurality of L-shaped support plates are evenly and fixedly arranged on the first outer gear ring, one end of the L-shaped support plate is inserted into an annular groove provided on the outer side wall of the positioning drum, and the worm and the first outer gear ring are meshingly connected.

[0012] The clamping ring includes a lifting ring body, a conventional plate and a temporary plate. A plurality of conventional plates are evenly fixed on the inner wall of one end of the lifting ring body, and a plurality of temporary plates are evenly fixed on the inner wall of the other end. The conventional plates and the temporary plates are alternately distributed, and take turns to intercept and position a follower block fixed on the positioning drum. The lifting ring body and the L-shaped lifting plate are fixedly connected.

[0013] The reciprocating device includes an adjusting gear, a pressure shaft, a cam, a pendulum column, a folding column and a reciprocating rack. One end of the folding column is fixed on the transverse ring body, and the pressure shaft is movably sleeved in a through hole opened at the other end of the folding column. An adjusting gear is fixed to one end of the pressure shaft, and the adjusting gear is meshed and transmitted with an outer gear ring arranged on the positioning drum. A cam is fixed to the other end of the pressure shaft. One end of the pendulum column is hinged to the cam, and the other end is hinged to the reciprocating rack. The reciprocating rack slides through a groove opened on the transverse ring body, and the reciprocating rack is meshed and transmitted with a gear fixed on the external control shaft.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. When the print head that is continuously discharging material stops or changes direction during its movement, it will automatically trigger the cross-cutting of the knife plate, thereby preventing the wax material discharged from the discharge tube from being involved with the already laid wax material. In this way, the surface of the 3D product produced will not have the problem of local surface foreign matter protrusions caused by involvement, and the 3D products prepared by the present invention are more refined.

[0015] 2. The knife plate of the present invention quickly cross-cuts the columnar wax material discharged from the discharge tube, and the cross-cutting swing of the knife plate is precisely controlled to avoid the situation where the knife plate stops in the middle of the discharge port of the discharge tube after cross-cutting the columnar material. The position of the knife plate will not intercept the normal discharge of the discharge tube at the node where the knife plate stops after cross-cutting and the node where the reset is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention.

[0017] Figure 2 Schematic diagram of the knife plate position.

[0018] Figure 3 This is a schematic diagram of the power mechanism location.

[0019] Figure 4 It is a schematic diagram of the power mechanism structure.

[0020] Figure 5 It is a schematic diagram of the structure of the drum rack device.

[0021] Figure 6 This is a schematic diagram of the outer shaft structure.

[0022] Figure 7 This is a schematic diagram of the location of the integrated ring.

[0023] Figure 8 It is a schematic diagram of the structure of the integrated ring.

[0024] Fig. 9 Schematic diagram of the position of the trapezoidal cylinder.

[0025] Fig.10 Schematic diagram of the buffer unit structure.

[0026] Fig.11 It is a schematic diagram of the structure of the overlapping device.

[0027] Fig.12 It is a schematic diagram of the brake ring structure.

[0028] Fig.13 It is a schematic diagram of the cylinder group structure.

[0029] Fig.14 Schematic diagram of the clamping ring structure.

[0030] Fig.15 It is a schematic diagram of the reciprocating device structure.

[0031] Fig.16 Schematic diagram for adjusting gear position.

[0032] In the figure: print head 1, heater 2, discharge tube 3, knife plate 4, outer shaft 5, power mechanism 6, cylinder frame device 7, collective ring 8, brake ring 9, column 10, transverse ring body 11, L-shaped lifting plate 12, guide square tube 13, pull-back spring 14, short shaft 15, oblique shaft 16, fixed axis plate 17, external control shaft 18, heavy ring tube 19, trapezoidal tube 20, fixed ring tube 21, buffer unit 22, ring plate gear 23, overlap device 24, unit spring 25, unit rack 26, divider Shaft 27, unit frame 28, one-way bearing 29, ring gear 30, head shaft 31, lap frame 32, tripod 33, C-shaped spring 34, tail shaft 35, worm 36, barrel group 37, retaining ring 38, reciprocating device 39, first outer ring gear 40, spring 41, L-shaped support plate 42, positioning rotating cylinder 43, follower block 44, lifting ring body 45, conventional plate 46, temporary plate 47, adjusting gear 48, pressure shaft 49, cam 50, pendulum column 51, folding column 52, reciprocating rack 53. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the technical solutions in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figures 1 to 16 The present invention provides a technical solution: a wax model 3D printing device for investment casting, comprising a print head 1 for stacking and discharging materials in layers, a heater 2 for heating the discharging material is connected to the bottom end of the print head 1, a discharging tube 3 for discharging columnar materials is connected below the heater 2, a knife plate 4 for cross-cutting the columnar materials is arranged at the bottom end of the discharging tube 3, an outer shaft 5 is connected to one end of the knife plate 4, a driving energy supply power mechanism 6 is connected to the upper end of the outer shaft 5, a barrel cavity for a built-in power mechanism 6 is arranged in the print head 1, the power mechanism 6 comprises a barrel rack device 7, a gathering ring 8 for collecting power distributed in the barrel rack device 7, and a brake ring 9 for releasing power, a brake ring 9 is transmission-connected to the bottom of the gathering ring 8, and the brake ring 9 is transmission-connected to the outer shaft 5, and the barrel rack device 7 supports the gathering ring 8 and the brake ring 9.

[0035] The print head 1 and the heater 2 are both prior art equipment. During the printing process, the print head 1 moves back and forth. During each directional movement, the print head 1 continuously discharges columnar viscous material, where the material can be brown wax, white wax or red wax in the prior art. The viscous material is spread out like a rope. After the print head 1 moves to the end, it moves in the opposite direction to continue to discharge the columnar viscous material. The laid multi-layer materials are stacked layer by layer. When the material hardens, the molded product is displayed. Since the material is soft and sticky, the print head 1 changes direction at the end of the movement. The laid material is not completely cooled and bonded with the material below. After the print head 1 moves in the opposite direction, the material is viscous and the laid material may be pulled and carried away by the columnar material discharged from the discharge tube 3. Therefore, the present invention adopts a method of forcibly cutting and separating by a knife plate 4, so that the next layer of laid material is completely separated from the previous layer of material at the end position, thereby preventing the laid material from being stuck and carried away. After the material of the product produced by the present invention hardens, there is no foreign matter protruding from the product appearance, and the appearance of the product produced is more refined, effectively improving the quality of the product.

[0036] From the phenomenon, after the print head 1 in continuous material discharging moves horizontally to the end, the knife plate 4 automatically cross-cuts the columnar material, and the laid material is completely separated from the material just discharged from the discharging tube 3. Then the print head 1 moves horizontally in the opposite direction. Every time the print head 1 stops or changes direction during translation, the knife plate 4 will automatically cut horizontally.

[0037] refer to Figure 5It is understood that the drum rack device 7 includes a transverse ring body 11, a plurality of columns 10 vertically arranged on the transverse ring body 11, a plurality of guide square tubes 13 fixedly arranged in the transverse ring body 11, an L-shaped lifting plate 12 sliding through each guide square tube 13, and a pull-back spring piece 14 connected to the bottom end of the L-shaped lifting plate 12, one end of the pull-back spring piece 14 is fixed on the guide square tube 13, and the other end is fixed on the L-shaped lifting plate 12.

[0038] refer to Figure 6 It is understood that the external shaft 5 includes a short shaft 15, an inclined shaft 16, a fixed shaft plate 17 and an external control shaft 18. One end of the fixed shaft plate 17 is fixed on the print head 1. The short shaft 15 and the inclined shaft 16 are respectively movably sleeved in two through holes opened on the fixed shaft plate 17. One end of the external control shaft 18 is connected by meshing transmission with a fixed bevel gear and a bevel gear fixed at one end of the inclined shaft 16. The other end of the external control shaft 18 extends into the print head 1 and is connected by transmission with the brake ring 9. The other end of the inclined shaft 16 is connected by meshing transmission with a fixed bevel gear and a bevel gear fixed at one end of the short shaft 15. The other end of the short shaft 15 is fixed on the knife plate 4.

[0039] refer to Figure 8 It is understood that the collective ring 8 includes a heavy ring cylinder 19, a trapezoidal cylinder 20, a fixed ring cylinder 21, a buffer unit 22, a ring plate gear 23 and a lap joint 24. The fixed ring cylinder 21 is internally provided with a shaking heavy ring cylinder 19, and the fixed ring cylinder 21 is externally fixedly connected to the column 10. A plurality of buffer units 22 are evenly arranged on the fixed ring cylinder 21, and the plurality of buffer units 22 cooperate to support the heavy ring cylinder 19. A trapezoidal cylinder 20 for collision transmission is distributed above the middle of the heavy ring cylinder 19, and a ring plate gear 23 is arranged below the fixed ring cylinder 21. One end of the lap joint 24 is transmission-connected to the ring plate gear 23, and the other end is transmission-connected to the brake ring 9. One end of the L-shaped lifting plate 12 is fixedly connected to the trapezoidal cylinder 20.

[0040] refer to Fig.10 It is understood that the buffer unit 22 includes a unit spring piece 25, a unit rack 26, a sub-shaft 27, a unit frame 28, a one-way bearing 29 and a ring gear 30. The unit rack 26 slides through the plate hole opened on the fixed ring cylinder 21, and one end of the unit rack 26 is inserted into the annular groove set on the outer wall of the heavy ring cylinder 19. One end of the sub-shaft 27 is meshingly connected with the unit rack 26 through a fixed gear. One end of the unit spring piece 25 is fixed on the unit rack 26, and the other end is fixed on the fixed ring cylinder 21. The other end of the sub-shaft 27 is fixedly sleeved with a one-way bearing 29, and the outside of the one-way bearing 29 is sleeved with a ring gear 30. The ring gear 30 and the ring plate gear 23 are meshingly connected. The sub-shaft 27 is movably sleeved in the through hole opened on the unit frame 28. One end of the unit frame 28 is fixed on the fixed ring cylinder 21, and the inner edge of the ring plate gear 23 is stuck in the groove opened on the unit frame 28.

[0041] refer to Fig.11It is understood that the lap joint device 24 includes a head shaft 31, a lap joint frame 32, a tripod 33, a C-shaped spring clip 34, a tail shaft 35 and a worm 36. One end of the lap joint frame 32 is fixed on the fixed ring cylinder 21, and the head shaft 31, the tail shaft 35 and the worm 36 are respectively movably sleeved in three through holes opened on the lap joint frame 32. One end of the head shaft 31 is connected by meshing transmission with a fixed gear and an annular plate gear 23. The other end of the lap joint frame 32 is fixed with a tripod 33. A plurality of C-shaped spring clips 34 are evenly arranged and fixed on the tripod 33. The C-shaped spring clips 34 are inserted into the arc groove opened on the outer wall of one end of the tail shaft 35. The other end of the tail shaft 35 is connected by meshing transmission with a fixed bevel gear and a bevel gear fixed at one end of the worm 36.

[0042] refer to Fig.12 It is understood that the brake ring 9 includes a barrel group 37, a retaining ring 38 and a reciprocating device 39, the barrel group 37 is transmission-connected to the worm 36, a retaining ring 38 is provided on the outer ring of the barrel group 37, and a reciprocating device 39 is transmission-connected between the barrel group 37 and the external control shaft 18.

[0043] refer to Fig.13 It is understood that the barrel group 37 includes a first outer gear ring 40, a spring 41, an L-shaped support plate 42 and a positioning drum 43. The first outer gear ring 40 is provided with a positioning drum 43 inside the ring, and the spring 41 is connected between the positioning drum 43 and the first outer gear ring 40. A plurality of L-shaped support plates 42 are evenly and fixedly provided on the first outer gear ring 40, and one end of the L-shaped support plate 42 is inserted into an annular groove provided on the outer side wall of the positioning drum 43. The worm 36 and the first outer gear ring 40 are meshed and driven to be connected.

[0044] refer to Fig.14 It is understood that the retaining ring 38 includes a lifting ring body 45, a conventional plate 46 and a temporary plate 47. A plurality of conventional plates 46 are evenly fixed on the inner wall of one end of the lifting ring body 45, and a plurality of temporary plates 47 are evenly fixed on the inner wall of the other end. The conventional plates 46 and the temporary plates 47 are alternately distributed, and take turns to intercept a follower block 44 fixed on the positioning drum 43. The lifting ring body 45 and the L-shaped lifting plate 12 are fixedly connected.

[0045] refer to Fig.15 It is understood that the reciprocating device 39 includes an adjusting gear 48, a pressure shaft 49, a cam 50, a pendulum column 51, a folding column 52 and a reciprocating rack 53. One end of the folding column 52 is fixed on the transverse ring body 11, and the pressure shaft 49 is movably sleeved in a through hole opened at the other end of the folding column 52. An adjusting gear 48 is fixed to one end of the pressure shaft 49, and the adjusting gear 48 is meshingly connected to the outer gear ring provided on the positioning drum 43. A cam 50 is fixed to the other end of the pressure shaft 49. One end of the pendulum column 51 is hinged to the cam 50, and the other end is hinged to the reciprocating rack 53. The reciprocating rack 53 slides through the groove opened on the transverse ring body 11, and the reciprocating rack 53 is meshingly connected to the gear fixed on the external control shaft 18.

[0046] The power for the knife plate 4 to cross-cut the material comes from the collection of the collecting ring 8, and is controlled to be released after being adjusted and converted by the brake ring 9. The release node is when the print head 1 pauses or changes direction during translation. The specific transmission principle is: when the print head 1 pauses or changes direction, the inertia of the heavy ring cylinder 19 will delay the accompanying movement, that is, the inertia causes the heavy ring cylinder 19 to shake relatively in the fixed ring cylinder 21, and multiple evenly arranged unit racks 26 cooperate to support the heavy ring cylinder 19. The movement of the heavy ring cylinder 19 causes the expansion and contraction of the unit rack 26. The reciprocating movement of the unit rack 26 drives the sub-shaft 27 to rotate reciprocatingly, and then the ring gear 30 is transmitted through the one-way bearing 29. The ring gear 30 rotates in a directional manner to drive the ring plate gear 23, and the ring plate gear 23 rotates in a directional manner to drive the head shaft 31. Then the tripod 33 rotates to drive all the C-shaped springs 34, and then drives the tail shaft 35 to rotate, and the tail shaft 35 drives the worm 36, and the worm 36 drives the first outer gear When the ring 40 rotates, the rotation of the first outer gear ring 40 causes the spring 41 to contract and store power. When the positioning drum 43 can rotate, the spring 41 releases power to rotate the positioning drum 43. The above is an autonomous power storage mechanism. The pause or change of direction of the print head 1 will cause the heavy ring drum 19 to shake, and the shaking will continue for a period of time, so that the spring 41 can continue to store power. In addition, the print head 1 will automatically trigger the switch mechanism at the pause or change of direction node. Because the heavy ring drum 19 has the largest movement amplitude at the beginning of the shaking, it will directly trigger the switch. After the trigger is completed, the power generated in the subsequent shaking of the heavy ring drum 19 with reduced amplitude is continuously transferred and transmitted, and the trigger switch is the switch for the cross-cutting of the knife plate 4. In this way, the timing of the cross-cutting of the knife plate 4 is the initial timing of the pause or change of direction of the print head 1. In this way, the discharge tube 3 discharges the columnar material during the translation. The discharge tube 3 pauses or deforms, and the knife plate 4 automatically and quickly cross-cuts the material.

[0047] The principle of the switch mechanism is that the heavy ring tube 19 initially shakes with the largest amplitude, and the heavy ring tube 19 will push against the trapezoidal tube 20, and then Fig. 9 The trapezoidal cylinder 20 in the middle moves axially upward, and the trapezoidal cylinder 20 drives the L-shaped lifting plate 12, and the L-shaped lifting plate 12 moves upward and drives the lifting ring body 45. Fig.14After the retaining ring 38 in the middle rises, the conventional plate 46 rises and no longer intercepts the follower block 44. The positioning rotating cylinder 43 instantly drives the follower block 44 to rotate. Because the clockwork 41 that accumulates power releases power to drive the positioning rotating cylinder 43, the temporary plate 47 and the conventional plate 46 rise synchronously. Although the conventional plate 46 lets go of the follower block 44, the follower block 44 can move in a circle, but after moving a fixed distance, it is intercepted by the next temporary plate 47 that has just risen, and continues to return to the top of the heavy ring cylinder 19 to shake. After the heavy ring cylinder 19 shakes to the maximum extent, the heavy ring cylinder 19 gradually shakes slightly, and the pull-back spring piece 14 drives the L-shaped lifting plate 12 to drive the trapezoidal cylinder 20 to move axially downward, and the small shaking of the heavy ring cylinder 19 does not contact the trapezoidal cylinder 20. The L-shaped lifting plate 12 descends and drives the retaining ring 38 to descend as a whole. In this way, the temporary plate 47 that intercepts the follower block 44 descends, and the follower block 44 can continue to move in a circle, and then is intercepted by the descending conventional plate 46. In this way, an output stage ends, that is, reference Fig.14 After the follower block 44 is intercepted and released by the first conventional plate 46, it will eventually be intercepted by the next conventional plate 46, but it will be intercepted once by the temporary plate 47 on the way. If there is no temporary plate 47 to intercept on the way, the conventional plate 46 may rise and then fall, and the next conventional plate 46 will not intercept the follower block 44 in the orbiting motion. The spring 41 will quickly release all the accumulated power, and the subsequent drive cannot continue for a period of time. Therefore, the temporary plate 47 intercepts on the way to ensure the orbiting motion of the follower block 44, and the rotation angle of the positioning drum 43 is controlled and fixed.

[0048] After the follower block 44 is released by the first conventional plate 46, it is intercepted by the second conventional plate 46, the positioning drum 43 rotates a fixed angle, the positioning drum 43 drives the adjusting gear 48, the adjusting gear 48 rotates just one circle, the adjusting gear 48 drives the pressure shaft 49, and then the cam 50 rotates to drive the pendulum column 51 to swing, thereby causing the reciprocating rack 53 to move back and forth once, driving the external control shaft 18 to reciprocate, and then driving the short shaft 15 through the inclined shaft 16, the short shaft 15 reciprocatingly rotates to drive the knife plate 4, the knife plate 4 reciprocates once, so that the knife plate 4 quickly cross-cuts the columnar material discharged from the discharge tube 3, and the knife plate 4 automatically resets to the position after the cross-cutting is completed. Figure 6 The position shown is also the initial position. The temporary plate 47 proposed earlier intercepts the follower block 44 once midway. Corresponding to the swing of the blade 4, the blade 4 quickly crosscuts and swings to the head node. Then the temporary plate 47 resets and lets go of the follower block 44, which corresponds to the reverse swing reset stage of the blade 4. Figure 6 When the knife plate 4 swings and cross-cuts the material, the knife plate 4 will not stop halfway through its one-way swing, because the knife plate 4 swings to the bottom of the discharge port of the discharge tube 3 and will intercept and affect the discharge of the discharge tube 3. In order to avoid such a situation, the present invention uses a retaining ring 38 to intercept the follower block 44 to accurately control the cross-cutting swing node position of the knife plate 4.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wax model 3D printing device for investment casting, comprising a printing head (1) for stacking and discharging materials layer by layer, wherein the bottom end of the printing head (1) is connected to a heater (2) for heating the discharged materials, characterized in that: A discharge tube (3) for discharging columnar materials is connected below the heater (2); a knife plate (4) for cross-cutting the columnar materials is arranged at the bottom end of the discharge tube (3); an outer shaft (5) is connected to one end of the knife plate (4); a driving power supply mechanism (6) is connected to the upper end of the outer shaft (5); a cylinder cavity for a built-in power mechanism (6) is arranged in the print head (1); the power mechanism (6) comprises a cylinder frame device (7), a collection ring (8) distributed in the cylinder frame device (7) for collecting power, and a brake ring (9) for releasing power; a brake ring (9) is transmission-connected to the bottom of the collection ring (8); and the brake ring (9) is transmission-connected to the outer shaft (5); the cylinder frame device (7) supports the collection ring (8) and the brake ring (9).

2. A wax pattern 3D printing device for investment casting according to claim 1, characterized in that: The drum rack device (7) comprises a transverse ring body (11), a plurality of upright posts (10) vertically arranged in a ring on the transverse ring body (11), a plurality of guide square tubes (13) fixedly arranged in a ring in the transverse ring body (11), an L-shaped lifting plate (12) slidingly passing through each guide square tube (13), and a pull-back spring sheet (14) connected to the bottom end of the L-shaped lifting plate (12), wherein one end of the pull-back spring sheet (14) is fixed to the guide square tube (13) and the other end is fixed to the L-shaped lifting plate (12).

3. A wax pattern 3D printing device for investment casting according to claim 2, characterized in that: The external shaft (5) comprises a short shaft (15), an oblique shaft (16), a fixed shaft plate (17) and an external control shaft (18); one end of the fixed shaft plate (17) is fixed on the print head (1); the short shaft (15) and the oblique shaft (16) are respectively movably sleeved in two through holes opened on the fixed shaft plate (17); one end of the external control shaft (18) is meshed and driven with a fixed bevel gear and a bevel gear fixed at one end of the oblique shaft (16); the other end of the external control shaft (18) extends into the print head (1) and is then transmission-connected to the brake ring (9); the other end of the oblique shaft (16) is meshed and driven with a fixed bevel gear and a bevel gear fixed at one end of the short shaft (15); and the other end of the short shaft (15) is fixed on the knife plate (4).

4. A wax pattern 3D printing device for investment casting according to claim 3, characterized in that: The collective ring tool (8) comprises a heavy ring cylinder (19), a trapezoidal cylinder (20), a fixed ring cylinder (21), a buffer unit (22), a ring plate gear (23) and a lap joint device (24). The fixed ring cylinder (21) is provided with a swaying heavy ring cylinder (19) in an annular manner, the fixed ring cylinder (21) is fixedly connected to the column (10) on the outside, a plurality of buffer units (22) are evenly arranged on the fixed ring cylinder (21), and the plurality of buffer units (22) cooperate to support the heavy ring cylinder (19), a collision transmission trapezoidal cylinder (20) is distributed above the middle of the heavy ring cylinder (19), a ring plate gear (23) is arranged below the fixed ring cylinder (21), one end of the lap joint device (24) is transmission-connected to the ring plate gear (23), and the other end is transmission-connected to the brake ring tool (9), and one end of the L-shaped lifting plate (12) is fixedly connected to the trapezoidal cylinder (20).

5. A wax pattern 3D printing device for investment casting according to claim 4, characterized in that: The buffer unit (22) comprises a unit spring sheet (25), a unit rack (26), a split shaft (27), a unit frame (28), a one-way bearing (29) and a ring gear (30). The unit rack (26) slides through a plate hole provided on the fixed ring cylinder (21). One end of the unit rack (26) is inserted into a ring groove provided on the outer wall of the heavy ring cylinder (19). One end of the split shaft (27) is meshed and connected to the unit rack (26) through a fixed gear. One end of the unit spring sheet (25) is fixed to the unit rack. The rack (26) is fixed on the fixed ring cylinder (21), and the other end is fixed on the fixed ring cylinder (21). The other end of the split shaft (27) is fixedly sleeved with a one-way bearing (29), and the outer side of the one-way bearing (29) is sleeved with a ring gear (30). The ring gear (30) and the ring plate gear (23) are meshed and connected. The split shaft (27) is movably sleeved in a through hole opened on the unit frame (28). One end of the unit frame (28) is fixed on the fixed ring cylinder (21), and the inner edge of the ring plate gear (23) is inserted into a groove opened on the unit frame (28).

6. A wax pattern 3D printing device for investment casting according to claim 4, characterized in that: The lap joint device (24) comprises a head shaft (31), a lap joint frame (32), a tripod (33), a C-shaped spring piece (34), a tail shaft (35) and a worm (36); one end of the lap joint frame (32) is fixed on the fixed ring cylinder (21); the head shaft (31), the tail shaft (35) and the worm (36) are respectively movably sleeved in three through holes provided on the lap joint frame (32); one end of the head shaft (31) is meshingly connected with a ring plate gear (23) through a fixed gear; the other end of the lap joint frame (32) is fixed with a tripod (33); a plurality of C-shaped spring pieces (34) are evenly arranged and fixed on the tripod (33); the C-shaped spring pieces (34) are inserted into an arc groove provided on an outer wall of one end of the tail shaft (35); the other end of the tail shaft (35) is meshingly connected with a fixed bevel gear and a bevel gear fixed at one end of the worm (36) through a fixed bevel gear.

7. A wax pattern 3D printing device for investment casting according to claim 6, characterized in that: The brake ring (9) comprises a barrel assembly (37), a snap ring (38) and a reciprocating device (39); the barrel assembly (37) is transmission-connected to the worm (36); the outer ring of the barrel assembly (37) is provided with a snap ring (38); and the reciprocating device (39) is transmission-connected between the barrel assembly (37) and the external control shaft (18).

8. A wax pattern 3D printing device for investment casting according to claim 7, characterized in that: The barrel assembly (37) comprises a first outer gear ring (40), a mainspring (41), an L-shaped support plate (42) and a positioning rotating cylinder (43); the first outer gear ring (40) is provided with a positioning rotating cylinder (43) in an annular manner; the mainspring (41) is connected between the positioning rotating cylinder (43) and the first outer gear ring (40); a plurality of L-shaped support plates (42) are evenly and fixedly provided on the first outer gear ring (40); one end of the L-shaped support plate (42) is inserted into an annular groove provided on an outer side wall of the positioning rotating cylinder (43); and the worm (36) and the first outer gear ring (40) are meshingly connected.

9. A wax pattern 3D printing device for investment casting according to claim 8, characterized in that: The clamping ring (38) comprises a lifting ring body (45), a conventional plate (46) and a temporary plate (47); a plurality of conventional plates (46) are evenly fixedly arranged on the inner wall of one end of the lifting ring body (45), and a plurality of temporary plates (47) are evenly fixedly arranged on the inner wall of the other end; the conventional plates (46) and the temporary plates (47) are alternately arranged and take turns to block and intercept a follower block (44) fixed on the positioning rotating drum (43); the lifting ring body (45) and the L-shaped lifting plate (12) are fixedly connected.

10. A wax pattern 3D printing device for investment casting according to claim 8, characterized in that: The reciprocating device (39) comprises an adjusting gear (48), a pressure shaft (49), a cam (50), a pendulum column (51), a folding column (52) and a reciprocating rack (53). One end of the folding column (52) is fixed on the transverse ring body (11). The pressure shaft (49) is movably sleeved in a through hole opened at the other end of the folding column (52). An adjusting gear (48) is fixed on one end of the pressure shaft (49). The adjusting gear (48) is meshingly connected to an outer gear ring provided on the positioning rotating cylinder (43). The other end of the pressure shaft (49) is fixed with a cam (50). One end of the pendulum column (51) is hinged to the cam (50), and the other end is hinged to the reciprocating rack (53). The reciprocating rack (53) slides through a groove opened on the transverse ring body (11), and the reciprocating rack (53) is meshingly connected to a gear fixed on the external control shaft (18).

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