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CN-122008546-A - Master-slave gear type unidirectional granular material conveying 3D printing gear assembly and design method thereof

CN122008546ACN 122008546 ACN122008546 ACN 122008546ACN-122008546-A

Abstract

The invention provides a master-slave gear type unidirectional transport granular material 3D printing gear assembly and a design method thereof, belonging to the technical field of 3D printing, the invention establishes a mathematical relationship of tooth number, rotating speed and diameter by utilizing a gear transmission ratio calculation equation through arranging a flow control assembly of meshing transmission of a driving gear and a driven gear in a storage shell, determines the inner diameter size of an output pipe by adopting an output matching equation, determines the embedding depth of the gear by matching with a holding groove depth optimization equation, the pitch of the conveying screw is coordinated with parameters of the flow control assembly through a pitch optimization equation, a complete transmission chain from granular material conveying to liquid flow control is constructed, accurate control of the rotation speed of the driven gear by the rotation speed adjustment of the driving gear is realized, the matching relation between the liquid conveying speed and the size of the output channel is ensured, and the technical problem of insufficient liquid flow control precision in the 3D printing granular material conveying process is solved.

Inventors

  • LIU SHOUXIN
  • TONG HUI
  • LI YANG

Assignees

  • 青岛瀚海常青科技有限公司

Dates

Publication Date
20260512
Application Date
20260205

Claims (10)

  1. 1. The utility model provides a principal and subordinate's gear type unidirectional transport granule material 3D prints gear subassembly, a serial communication port, including storing casing and conveying subassembly, store the bottom through connection of casing top and conveying subassembly, conveying subassembly is used for carrying granule material to the inside of storing the casing and melts the liquid that forms after, the intermediate position of storing the casing is provided with accuse stream subassembly, accuse stream subassembly includes driving gear and driven gear, driving gear and driven gear meshing are connected, driving gear's central point put and driving subassembly fixed connection, driving subassembly is used for driving gear rotation, driving gear rotation drives driven gear synchronous revolution, promote the below transport of liquid to accuse stream subassembly through the gear surface, storing casing's bottom central point put and be provided with the output tube, the output tube is used for deriving accuse stream subassembly rotation transport liquid, the transmission relation between driving gear and the driven gear is through gear ratio calculation equation determination driven gear's rotation speed and addendum circle diameter.
  2. 2. The gear assembly of claim 1, wherein the driving gear and the driven gear are of a double-model gear structure having the same tooth shape and different tooth numbers, the diameter of the outer circle of the teeth of the driving gear is smaller than the diameter of the outer circle of the teeth of the driven gear, and the number of the teeth of the driving gear is smaller than the number of the teeth of the driven gear.
  3. 3. The gear assembly of claim 2, wherein the tooth profiles of the driving gear and the driven gear are designed in an involute tooth profile, and the ratio of the root circle diameter of the driving gear to the root circle diameter of the driven gear is 1:1.5-1:2.5.
  4. 4. A gear assembly according to claim 3, wherein the driving assembly comprises a rotating rod fixedly connected to the geometric center of the driving gear, the rotating rod being adapted to rotate the driving gear about its geometric center axis, and a fixed rod fixed to the geometric center of the driven gear.
  5. 5. The gear assembly of claim 4, wherein the central axis of the rotating rod is disposed perpendicular to the plane of the driving gear, the central axis of the fixed rod is disposed perpendicular to the plane of the driven gear, and the outer cylindrical diameter of the rotating rod is greater than the outer cylindrical diameter of the fixed rod.
  6. 6. The gear assembly of claim 5, wherein the rotating rod is made of a stainless steel material, the fixing rod is made of an alloy steel material, and the ratio of the length of the rotating rod to the height of the storage housing is 0.6-0.9.
  7. 7. The gear assembly according to claim 6, wherein one end of the rotating rod is connected with a power system of the 3D printer, the power system comprises a driving motor and a driving belt, a key groove structure is arranged at the end of the rotating rod, and a key tooth structure matched with the key groove structure is arranged on the inner side of the driving belt.
  8. 8. A design method of a master-slave gear type unidirectional conveying granular material 3D printing gear assembly is characterized by comprising the following steps of constructing a master-slave gear type unidirectional conveying control frame, determining the meshing transmission relation of a master gear and a slave gear, setting the number of teeth of the master gear to 12-18 teeth and the number of teeth of the slave gear to 24-36 teeth, setting the ratio of the root circle diameter of the master gear to the root circle diameter of the slave gear to 1:1.5-1:2.5, establishing a gear transmission parameter game optimization model, inputting the number of teeth of the master gear, the number of teeth of the slave gear and the rotation speed of the master gear by using an upper model with maximum liquid conveying efficiency as a target, inputting the top circle diameter of the master gear and the top circle diameter of the slave gear by using a lower model with maximum gear meshing stability as a target, coupling the two models through a gear transmission ratio, acquiring experimental data, determining an output matching equation coefficient, a depth optimization equation coefficient of a containing groove and a pitch optimization equation coefficient, and adjusting gear transmission parameters according to the calculated result of the gear transmission parameter game optimization model.
  9. 9. The design method according to claim 8, wherein the upper model objective function is used for calculating the liquid transporting efficiency index based on the number of teeth of the driving gear, the number of teeth of the driven gear, the rotational speed of the driving gear, the top circle diameter of the driving gear teeth, and the top circle diameter of the driven gear teeth, and the lower model objective function is used for calculating the gear mesh stability index based on the top circle diameter of the driving gear teeth, the top circle diameter of the driven gear teeth, the gear pressure angle, and the gear ratio.
  10. 10. The design method according to claim 9, wherein when the deviation between the liquid conveying efficiency index calculated by the upper model and the preset conveying efficiency threshold is greater than 8%, the rotation speed of the driving gear is increased by 5% -15%, and when the gear engagement stability index calculated by the lower model is lower than 0.85, the center distance between the driving gear and the driven gear is reduced by 3% -10%.

Description

Master-slave gear type unidirectional granular material conveying 3D printing gear assembly and design method thereof Technical Field The invention belongs to the technical field of 3D printing, and particularly relates to a master-slave gear type unidirectional conveying granular material 3D printing gear assembly and a design method thereof. Background In the technical field of 3D printing, the melting and conveying of the granular material is a key link for realizing precise molding. Conventional particulate material delivery devices typically employ a single screw extrusion mechanism that outputs particulate material by pushing the material into a heated region through screw rotation and melting. In the prior art, since the screw extrusion mechanism relies on single-stage transmission control, when the printing speed is changed or the viscosity of the material fluctuates, the output flow rate of the molten liquid is difficult to maintain stable, resulting in uneven thickness of the printing layer. The existing flow control method is mainly realized by adjusting the rotating speed of a screw or the heating temperature, but the mode has low response speed and limited control precision, and particularly in an application scene needing to rapidly change the output flow, a single-stage transmission structure cannot provide enough transmission ratio adjusting range, so that the liquid conveying speed is not matched with the printing requirement. That is, the prior art has the technical problem that the accuracy of liquid flow control in the process of conveying the 3D printing granular material is insufficient. Disclosure of Invention In view of the above, the present invention provides a master-slave gear type unidirectional transport granular material 3D printing gear assembly and a design method thereof, which can solve the technical problem of insufficient accuracy of liquid flow control in the transport process of 3D printing granular material in the prior art. The invention is realized in that the first aspect provides a master-slave gear type unidirectional granular material conveying 3D printing gear assembly, which comprises a storage shell and a conveying assembly, wherein the top of the storage shell is in through connection with the bottom of the conveying assembly, the conveying assembly is used for conveying liquid formed by melting granular material into the storage shell, a flow control assembly is arranged in the middle of the storage shell and comprises a driving gear and a driven gear, the driving gear is in meshed connection with the driven gear, the central position of the driving gear is fixedly connected with the driving assembly, the driving assembly is used for driving the driving gear to rotate, the driving gear is driven to rotate synchronously, the liquid is pushed to be conveyed to the lower side of the flow control assembly through the surface of the gear, an output pipe is arranged at the central position of the bottom of the storage shell and used for guiding out the liquid conveyed by the flow control assembly in a rotating mode, and the transmission relation between the driving gear and the driven gear is used for determining the rotation speed and the tooth top circle diameter of the driven gear through a gear transmission ratio calculation equation. The driving gear and the driven gear are of double-model gear structures with the same tooth shape and different tooth numbers, the diameter of the outer circle of the gear teeth of the driving gear is smaller than that of the driven gear, and the tooth number of the driving gear is smaller than that of the driven gear. The tooth profiles of the driving gear and the driven gear are designed in an involute tooth shape, and the ratio of the diameter of the root circle of the driving gear to the diameter of the root circle of the driven gear is 1:1.5-1:2.5. The driving assembly comprises a rotating rod and a fixing rod, the rotating rod is fixedly connected with the geometric center position of the driving gear, the rotating rod is used for driving the driving gear to rotate around the geometric center axis of the driving gear, and the fixing rod is fixed at the geometric center position of the driven gear. The central axis of the rotating rod is perpendicular to the plane where the driving gear is located, the central axis of the fixed rod is perpendicular to the plane where the driven gear is located, and the diameter of the outer cylindrical surface of the rotating rod is larger than that of the outer cylindrical surface of the fixed rod. The rotating rod is made of stainless steel materials, the fixing rod is made of alloy steel materials, and the ratio of the length of the rotating rod to the height of the storage shell is 0.6-0.9. One end of the rotating rod is connected with a power system of the 3D printer, the power system comprises a driving motor and a driving belt, a key groove structure is arranged at the end part of t