# US 11,298,877 B2 · Variable-size fully-automatic 3D printing system based on cylindrical coordinate system

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- Number: US 11,298,877 B2
- Document ID: US11298877B2
- Status: Granted
- Kind: B2
- Application number: 16/669,602
- Filed: 2019-10-31
- Published: 2020-03-05
- Granted: 2022-04-12
- Earliest claimed: 2019-05-05
- Assignees: Xi'an University of Technology
- Applicants: Xi'an University of Technology
- Inventors: Gengxiang Wang; Pengfei Li; Kaihe Wei
- Web page: https://patentgrep.com/patent/US11298877B2

## CPC

- B29C 64/245: Platforms or substrates (support structures intended to be sacrificed after manufacture B29C64/40)
- B29C 64/209: Heads; Nozzles
- B29C 64/227: Driving means
- B33Y 30/00: Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING

## Abstract

A variable-size fully-automatic 3D printing system based on a cylindrical coordinate system includes a base provided with a retractable work platform; the base is provided with a vertical support side plate on a side thereof; an upper end of the support side plate is connected to a top plate, and the top plate is located directly above the base; a lower side of the top plate is connected to a sleeve via a column seat; a lower end of the sleeve is provided with a protrusion; a lower end of the protrusion is connected with a cross beam; a lower side of the cross beam is provided with a ball screw a, one end of the ball screw a is connected to a power end of a first servo motor disposed at an outer end of the cross beam.

## Claims

### Claim 1

A variable-size fully-automatic 3D printing system based on a cylindrical coordinate system, comprising: a base, wherein the base is provided with a retractable work platform; the base is provided with a vertical support side plate on a side thereof; an upper end of the support side plate is connected to a top plate, and the top plate is located directly above the base; a lower side of the top plate is connected to a sleeve via a column seat; a lower end of the sleeve is provided with a protrusion; a lower end of the protrusion is connected with a cross beam; a lower side of the cross beam is provided with a ball screw a, one end of the ball screw a is connected to a power end of a first servo motor disposed at an outer end of the cross beam, and the other end of the ball screw a is connected to a ball screw seat a disposed within a sliding block; a nozzle is slidably connected to a cylindrical guide track a via the sliding block; each side of the ball screw a is provided with the cylindrical guide track a; the sliding block is further connected to the ball screw a and driven by the ball screw a,
wherein the retractable work platform is configured to be adjusted a size based on a predetermined specification of printed objects,
wherein the retractable work platform comprises a cylindrical retractable platform seat, an inner wall of the retractable platform seat is fixed with 12 sets of cylindrical guide tracks b facing the center of a circle; a center of the retractable platform seat is provided with a rotary table, and a central hole of the rotary table is provided with a lifting platform; a sloping guide track is disposed on a lower side of the spaced cylindrical guide track b; a transmission rod is disposed between an inner bottom surface of the retractable platform seat and a bottom of a sliding block plate; a clamping block plate is located between the two sliding block plates when the retractable work platform is extended, and the sliding block plate acts as a top platform surface of the retractable work platform when the retractable work platform is retracted, the clamping block seat is located under the clamping block plate; the rotary table is connected to a second servo motor and rotated under the drive of the second servo motor.

### Claim 2 (depends on 1)

The variable-size fully-automatic 3D printing system based on a cylindrical coordinate system according to claim 1, wherein the top of an inner cavity of the column seat is provided with a servo motor b, and the servo motor b is fixed in a mouth of the inner cavity of the column seat via a connection plate; a power end of the servo motor b is connected to an internal gear; the internal gear is connected to the sleeve via an internal gear spline; an upper segment of the sleeve is nested in the inner cavity of the column seat; the inner cavity of the column seat on a lower side of the internal gear is provided with a servo motor c, a power end of the servo motor c is connected to the ball screw base b via a coupling, and the ball screw base b is connected to an upper end of the ball screw b; a lower end of the ball screw b is connected to the ball screw base c; the coupling is fixed to an upper end of a cavity of the protrusion via a circular baffle and a fastening screw b; the protrusion is disposed in the inner cavity of the sleeve; the servo motor c is connected with a coupling key of the coupling.

### Claim 3 (depends on 2)

The variable-size fully-automatic 3D printing system based on a cylindrical coordinate system according to claim 2, wherein the internal gear is provided with a planetary gear carrier and the planetary gear carrier is provided with three planetary gears thereon; the three planetary gears engage with a sun gear.

### Claim 4 (depends on 1)

The variable-size fully-automatic 3D printing system based on a cylindrical coordinate system according to claim 1, wherein a support rib is disposed between the top plate and the side plate.

### Claim 5 (depends on 1)

The variable-size fully-automatic 3D printing system based on a cylindrical coordinate system according to claim 1, wherein a top plate platform is disposed between the top plate and the column seat; the column seat is fixed to the top plate platform by a fastening screw a.

### Claim 6 (depends on 1)

The variable-size fully-automatic 3D printing system based on a cylindrical coordinate system according to claim 1, wherein the protrusion has a square cross section.