Bidirectional printing control system and method for sand mold 3D printer

Abstract

The invention relates to the technical field of sand mold 3D printing, and discloses a sand mold 3D printer two-way printing control system and method, and the system comprises an upper computer module, a PLC control module, a servo control module, a servo driving module, a network communication unit, a printing head injection module and a sand paving module. The manufacturing time of the single-layer sand mold is effectively shortened, and the manufacturing efficiency of the sand mold is improved. By means of the design, the idle running stroke is avoided, and the whole printing process is more compact and efficient. Compared with the prior art, the printing speed is increased by 50% or above, the single-layer printing time is controlled to be 11-15 seconds, through technical innovation and system optimization, the full-automatic two-way circulation printing control system and method remarkably improve the sand mold 3D printing efficiency and precision, the cost is saved, the product production period is prolonged, and a new solution is provided for industrial production.

Description

Technical Field

[0001] The present invention relates to the technical field of sand mold 3D printing technology. Specifically, it relates to a two-way printing control system and method for a sand mold 3D printer. Background Art

[0002] Most of the existing sand mold 3D printing devices in the market adopt a one-way cyclic sand laying and printing method for production throughout the printing process. They cannot meet the market demand in terms of performance indicators, efficiency, and energy consumption. After printing is completed, the printing device needs to return to the origin to reprint, resulting in an empty running stroke and wasting energy. Summary of the Invention

[0003] The purpose of the present invention is to provide a two-way printing control system and method for a sand mold 3D printer. This two-way printing control system for a sand mold 3D printer effectively reduces the manufacturing time of a single-layer sand mold and improves the manufacturing efficiency of the sand mold by adopting a two-way cyclic printing control system and method. This design avoids the empty running stroke, and the entire printing process is more compact and efficient. The printing speed is increased by more than 50% compared with the same period, and the single-layer printing time is controlled between 11 - 15 seconds. The fully automatic two-way cyclic printing control system and method significantly improve the efficiency and accuracy of sand mold 3D printing, save costs, improve the product production cycle, and provide a new solution for industrial production.

[0004] To achieve the above purpose, on the one hand, the present invention provides a two-way printing control system for a sand mold 3D printer, including a host computer module, a PLC control module, a servo control module, a servo drive module, a network communication unit, a print head spraying module, and a sand laying module; The host computer module is respectively connected to the PLC control module, the network communication unit, the print head spraying module, and the sand laying module through industrial network cables, and is used for automatically setting and obtaining the position information of the print head spraying module and the sand laying module, and automatically sending the position information to the PLC control module according to process requirements. The PLC control module sets printing parameters according to the position information; The network communication unit is respectively electrically connected to the PLC control module, the servo control module, the print head spraying module, and the sand laying module, and provides data exchange control between each module; The servo control module is electrically connected to the servo drive module, and is used for obtaining the printing parameters and then controlling the servo drive module to drive the print head spraying module and the sand laying module to move; The servo drive module is in transmission connection with the sand laying module and the print head spraying module to drive the sand laying module and the print head spraying module to perform cyclic printing along the positive or negative direction of the X-axis and Y-axis on the printing platform.

[0005] Preferably, the servo drive module includes a print head X-axis drive module, a print head Y-axis drive module, a vibration drive module, and a sand spreading Y-axis drive module; The print head Y-axis drive module is drivingly connected to the print head X-axis drive module, and the print head ejection module is drivingly connected to the print head Y-axis drive module; The vibration drive module is disposed on the sand spreading module, and the sand spreading module is drivingly connected to the sand spreading Y-axis drive module.

[0006] Preferably, the servo control module includes a print head X-axis control module, a print head Y-axis control module, a vibration control module, and a sand spreading Y-axis control module; The print head X-axis control module is configured to control the print head X-axis drive module to drive the print head ejection module to move along the X-axis of the print platform, and the print head Y-axis control module is configured to control the print head Y-axis drive module to drive the print head ejection module to move along the Y-axis above the print platform; The vibration control module is configured to control the vibration drive module to drive the sand spreading module to vibrate and feed materials, and the sand spreading Y-axis control module is configured to control the sand spreading Y-axis drive module to drive the sand spreading module to move along the Y-axis above the print platform.

[0007] Preferably, the print head X-axis drive module includes a print head X-axis sliding rail module and a print head X-axis servo motor, and the print head X-axis servo motor is drivingly connected to the print head X-axis sliding rail module; The print head Y-axis drive module includes a print head Y-axis sliding rail module and a print head Y-axis servo motor, the print head Y-axis sliding rail module is drivingly connected to the print head X-axis sliding rail module, the print head Y-axis servo motor is drivingly connected to the print head Y-axis sliding rail module, and the print head ejection module is drivingly disposed on the print head Y-axis sliding rail module; The print head X-axis sliding rail module drives the print head Y-axis sliding rail module to move along the X-axis above the print platform, and the print head Y-axis sliding rail module drives the print head ejection module to move along the Y-axis above the print platform.

[0008] Preferably, the vibration drive module includes a vibration motor disposed on the sand spreading module.

[0009] Preferably, the sand spreading Y-axis driving module includes a sand spreading Y-axis servo motor, two groups of sand spreading Y-axis sliding track modules, and a transmission shaft. The two groups of sand spreading Y-axis sliding track modules are respectively arranged on both sides of the printing platform. The sand spreading Y-axis servo motor is drivingly connected to any one of the two groups of sand spreading Y-axis sliding track modules. The two groups of sand spreading Y-axis sliding track modules are drivingly connected through the transmission shaft. The sand spreading module is drivingly connected to the two groups of sand spreading Y-axis sliding track modules, and the two groups of sand spreading Y-axis sliding track modules drive the sand spreading module to move along the Y-axis above the printing platform.

[0010] Preferably, the sand spreading module includes a sand bin, a sand storage hopper, and a conveyor. The sand bin is arranged on the sand spreading Y-axis sliding track module. The sand storage hopper is arranged at one end of the sand bin. The feeding end of the conveyor extends into the interior of the sand bin, and the output end of the conveyor is arranged outside the sand bin. There is a discharge port at the bottom of the sand bin, and the vibration motor is drivingly connected to the vibration shaft in the sand bin.

[0011] Preferably, the conveyor is a screw conveyor, including a sand conveying motor and a screw sand conveying shaft. The sand conveying motor is arranged at one end of the sand bin, and the screw sand conveying shaft is arranged in the sand bin. The sand conveying motor is drivingly connected to the screw sand conveying shaft.

[0012] Preferably, it further includes a power supply module, and the power supply module supplies power to the upper computer module, the PLC control module, the servo control module, the servo drive module, the network communication unit, the print head injection module, and the sand spreading module.

[0013] On the other hand, the present invention also discloses a two-way printing control method for the above sand mold 3D printer, and the method includes the following steps: S1: The upper computer module automatically sets and obtains the position information of the print head injection module and the sand spreading module, and automatically sends the position information to the PLC control module according to the process requirements; S2: The PLC control module obtains the position information, and sets printing parameters through the position information. The printing parameters include the sand spreading start position and the sand spreading end position, the printing positions 1, 2, 3, and 4 arranged clockwise along the printing platform, the forward safe movement position of the print head, and the reverse safe movement position of the print head; S3: The servo control module controls the servo drive module to drive the print head injection module and the sand spreading module to move to the position number and the start position according to the printing parameters; S4: Obtain the forward printing instruction and replenish sand into the sand laying module; the servo drive module drives the sand laying module to perform forward sand laying operation from the starting position to the ending position. When the sand laying module reaches the forward safe movement position of the print head, the servo drive module drives the print head spraying module to perform forward spraying and printing operations successively from position 1 - position 2 - position 3. The sand laying module moves to the ending position and waits, and the print head spraying module moves to position 4 and waits for instructions; S5: Obtain the reverse printing instruction and replenish sand into the sand laying module; the servo drive module drives the sand laying module to perform reverse sand laying operation from the ending position to the starting position. When the sand laying module reaches the reverse safe movement position of the print head, the servo drive module drives the print head spraying module to perform reverse spraying and printing operations successively from position 4 - position 3 - position 2. The sand laying module moves to the starting position and waits, and the print head spraying module moves to position 1 and waits for instructions; S6: Loop the printing steps of S4 and S5 until the printing is completed. The beneficial effects of the present invention are as follows:

[0014] (1) By setting up full - automatic two - way cyclic printing, the manufacturing time of a single - layer sand mold is effectively reduced, and the manufacturing efficiency of the sand mold is improved. This design avoids the empty - running stroke and does not require a return stroke, greatly reducing the actual cycle of the sand laying - spraying work cycle. The entire printing process is more compact and efficient. Compared with the same - type printing speed, it is increased by more than 50%, and the single - layer printing time is controlled between 11 - 15 seconds.

[0015] (2) Through technological innovation and system optimization, the efficiency and accuracy of 3D printing of sand molds are significantly improved, cost is saved, and the product production cycle is shortened, providing a new solution for industrial production.

[0016] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the drawings: Figure 1 The block diagram of the two - way printing control system of the sand mold 3D printer according to an embodiment of the present invention is shown; Figure 2 The installation schematic diagram of the print head spraying module according to an embodiment of the present invention is shown; Figure 3 The installation schematic diagram of the sand laying module according to an embodiment of the present invention is shown; Figure 4Shows the flowchart of the full-automatic two-way cyclic printing control method of a sand mold 3D printer according to an embodiment of the present invention; Figure 5 Shows the schematic diagram of the movement of the full-automatic two-way cyclic printing control system of a sand mold 3D printer according to an embodiment of the present invention. Explanation of reference numerals:

[0018] 1 Host computer module, 2 PLC control module, 3 Servo control module; 4 Servo drive module, 41 Print head X-axis drive module, 411 Print head X-axis sliding track module, 412 Print head X-axis servo motor, 42 Print head Y-axis drive module, 421 Print head Y-axis sliding track module, 422 Print head Y-axis servo motor, 43 Vibration drive module, 44 Sand spreading Y-axis drive module, 441 Sand spreading Y-axis servo motor, 442 Sand spreading Y-axis sliding track module, 443 Transmission shaft; 5 Network communication unit, 6 Print head spraying module; 7 Sand spreading module, 71 Sand bin, 72 Sand storage hopper, 73 Conveyor, 731 Sand conveying motor, 732 Spiral sand conveying shaft. Detailed implementation manners

[0019] The following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings. It should be understood that the detailed implementation manners described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. Embodiment 1

[0020] Please refer to Figures 1-5 , this embodiment discloses a two-way printing control system for a sand mold 3D printer, including a host computer module 1, a PLC control module 2, a servo control module 3, a servo drive module 4, a network communication unit 5, a print head spraying module 6, and a sand spreading module 7.

[0021] The host computer module 1 is respectively connected to the PLC control module 2, the network communication unit 5, the print head spraying module 6, and the sand spreading module 7 through industrial network cables, and is used to automatically set and obtain the position information of the print head spraying module 6 and the sand spreading module 7, and automatically send the position information to the PLC control module 2 according to the process requirements. The PLC control module 2 sets the printing parameters according to the position information. The printing parameters include setting the printing positions of No. 1, No. 2, No. 3, No. 4, the sand spreading start position, and the end position in a clockwise direction. The positions of No. 1, No. 2, No. 3, and No. 4 are respectively located at the four corners of the printing platform, the sand spreading start position is located above the printing platform, and the sand spreading end position is located below the printing platform, as Figure 5 shown.

[0022] The network communication unit 5 is electrically connected to the PLC control module 2, the servo control module 3, the print head injection module 6, and the sand spreading module 7 respectively, providing data exchange control between the modules.

[0023] The servo control module 3 is electrically connected to the servo drive module 4, and is used to obtain printing parameters and then control the servo drive module 4 to drive the print head injection module 6 and the sand spreading module 7 to move.

[0024] The servo drive module 4 is drivingly connected to the sand spreading module 7 and the print head injection module 6 to drive the sand spreading module 7 and the print head injection module 6 to perform cyclic printing along the positive or negative direction of the X-axis and the Y-axis on the printing platform.

[0025] In this embodiment, the clockwise direction is defined as the positive direction. The forward printing is performed from position 1 - position 2 - position 3 - position 4, the forward sand spreading is from the starting position to the ending position, the reverse printing is performed from position 4 - position 3 - position 2 - position 1, and the reverse sand spreading is from the ending position to the starting position.

[0026] Specifically, the servo drive module 4 includes a print head X-axis drive module 41, a print head Y-axis drive module 42, a vibration drive module 43, and a sand spreading Y-axis drive module 44; among them, the print head Y-axis drive module 42 is drivingly connected to the print head X-axis drive module 41, the print head injection module 6 is drivingly connected to the print head Y-axis drive module 42, the vibration drive module 43 is arranged on the sand spreading module 7, and the sand spreading module 7 is drivingly connected to the sand spreading Y-axis drive module 44.

[0027] The servo control module 3 includes a print head X-axis control module, a print head Y-axis control module, a vibration control module, and a sand spreading Y-axis control module. The print head X-axis control module is used to control the print head X-axis drive module 41 to drive the print head injection module 6 to move along the X-axis of the printing platform, the print head Y-axis control module is used to control the print head Y-axis drive module 42 to drive the print head injection module 6 to move along the Y-axis above the printing platform, the vibration control module is used to control the vibration drive module 43 to drive the sand spreading module 7 to vibrate and feed materials, and the sand spreading Y-axis control module is used to control the sand spreading Y-axis drive module 44 to drive the sand spreading module 7 to move along the Y-axis above the printing platform.

[0028] Such as Figure 2As shown in the figure, the print head X-axis drive module 41 includes a print head X-axis sliding track module 411 and a print head X-axis servo motor 412. The print head X-axis servo motor 412 is drivingly connected to the print head X-axis sliding track module 411. The print head Y-axis drive module 42 includes a print head Y-axis sliding track module 421 and a print head Y-axis servo motor 422. The print head Y-axis sliding track module 421 is drivingly connected to the print head X-axis sliding track module 411. The print head Y-axis servo motor 422 is drivingly connected to the print head Y-axis sliding track module 421. The print head ejection module 6 is drivingly arranged on the print head Y-axis sliding track module 421. The print head X-axis sliding track module 411 drives the print head Y-axis sliding track module 421 to move along the X-axis above the printing platform, and the print head Y-axis sliding track module 421 drives the print head ejection module 6 to move along the Y-axis above the printing platform.

[0029] In this embodiment, the print head ejection module 6 further includes a built-in control board and a liquid material system. The built-in board communication interface is connected to the upper computer module communication interface. The print head ejection module 6 controls and implements the ejection printing task through the built-in control board during the movement and displacement process.

[0030] The vibration drive module 43 includes a vibration motor arranged on the sand spreading module 7. The vibration motor drives the vibration shaft on the sand spreading module 7 to vibrate, thereby completing the sand spreading operation.

[0031] Please refer to Figure 3 , the sand spreading Y-axis drive module 44 includes a sand spreading Y-axis servo motor 441, two groups of sand spreading Y-axis sliding track modules 442, and a transmission shaft 443. The two groups of sand spreading Y-axis sliding track modules 442 are respectively arranged on both sides of the printing platform. The sand spreading Y-axis servo motor 441 is drivingly connected to any one of the two groups of sand spreading Y-axis sliding track modules 442. The two groups of sand spreading Y-axis sliding track modules 442 are drivingly connected through the transmission shaft 443. The sand spreading module 7 is drivingly connected to the two groups of sand spreading Y-axis sliding track modules 442. The two groups of sand spreading Y-axis sliding track modules 442 drive the sand spreading module 7 to move along the Y-axis above the printing platform.

[0032] Please continue to refer to Figure 3 , the sand spreading module 7 includes a sand bin 71, a sand storage hopper 72, and a conveyor 73. The sand bin 71 is arranged on the sand spreading Y-axis sliding track module 442. The sand storage hopper 72 is arranged at one end of the sand bin 71. The feeding end of the conveyor 73 extends into the interior of the sand bin 71. The output end of the conveyor 73 is arranged outside the sand bin 71. The bottom of the sand bin 71 is provided with a discharge port. The vibration motor is drivingly connected to the vibration shaft in the sand bin 71.

[0033] The conveyor 73 is a screw conveyor, including a sand conveying motor 731 and a screw sand conveying shaft 732. The sand conveying motor 731 is arranged at one end of the sand bin 71, the screw sand conveying shaft 732 is arranged inside the sand bin 71, and the sand conveying motor 731 is in transmission connection with the screw sand conveying shaft 732.

[0034] During sand replenishment, the sand material enters the sand bin 71 from the sand storage hopper 72 and is conveyed into the interior of the sand bin 71 through the conveyor 73, so that the sand material is evenly distributed in the sand bin 71. When sand laying is required, the vibration motor is started, and the vibration motor drives the vibration shaft to vibrate so that the sand material flows out from the bottom of the sand bin 71 for sand laying.

[0035] In this embodiment, the system further includes a power supply module 8, and the power supply module 8 supplies power to the upper computer module 1, the PLC control module 2, the servo control module 3, the servo drive module 4, the network communication unit 5, the print head spraying module 6, and the sand laying module 7. Specifically, the power supply module 8 includes two parts. One part provides the electric energy voltage for driving, and the other part provides the electric energy voltage for control. The establishment of the electric energy voltage for driving is mainly provided by the electric energy filtering module and the three-phase 380VAC to three-phase 220VAC power supply module; the establishment of the electric energy voltage for control is mainly provided by the protection switch and the 24VDC power conversion module. Embodiment 2

[0036] As Figure 4 shown, a two-way printing control method for a sand mold 3D printer includes the following steps: S1: The upper computer module 1 automatically sets and obtains the position information of the print head spraying module 6 and the sand laying module 7, and automatically sends the position information to the PLC control module 2 according to the process requirements; S2: The PLC control module 2 obtains the position information and sets the printing parameters through the position information. The printing parameters include the starting position and the ending position of sand laying, the printing positions 1, 2, 3, and 4 set clockwise along the printing platform, the forward safe movement position of the print head, and the reverse safe movement position of the print head; S3: The servo control module 3 controls the servo drive module 4 to drive the print head spraying module 6 and the sand laying module 7 to move to the position 1 and the starting position according to the printing parameters; S4: Obtain a forward printing instruction and replenish sand into the sand laying module 7; the servo drive module 4 drives the sand laying module 7 to perform a forward sand laying operation from the starting position to the ending position. When the sand laying module 7 reaches the set forward safe movement position of the print head, the servo drive module 4 drives the print head spraying module 6 to perform a forward spraying printing operation from position 1 - position 2 - position 3 in sequence. The sand laying module 7 moves to the ending position and waits, and the print head spraying module 6 moves to position 4 and waits for an instruction; S5: Obtain the reverse printing instruction and replenish sand into the sand laying module 7; the servo drive module 4 drives the sand laying module 7 to perform reverse sand laying operation from the end position to the starting position. When the sand laying module 7 reaches the set reverse safe moving position of the print head, the servo drive module 4 drives the print head spraying module 6 to perform reverse spraying and printing operations in sequence from the 4th position - 3rd position - 2nd position. The sand laying module 7 moves to the starting position and waits, and the print head spraying module 6 moves to the 1st position and waits for instructions; S6: Loop through the printing steps of S4 and S5 until the printing is completed.

[0037] Specifically, the two-way printing working mode is divided into the following stages: activate the two-way circular printing mode - the printing task starts - the PLC control module 2 executes the two-way circular displacement working process - the sand laying module 7 executes the sand laying working process - the print head spraying module 6 executes the printing and spraying working process.

[0038] The sand laying working process is as follows: After the sand laying module 7 moves to the sand replenishing position and the sand replenishment is completed, the PLC control module 2 issues a servo control module 4 drive command, and the sand laying Y-axis drive module 44 executes forward sand laying. Specifically, the sand laying module 7 moves from the starting position to the sand laying end position; when reaching the set vibration sand feeding 1st position during sand laying, the vibration motor starts to vibrate and feed sand. When the sand laying module 7 reaches the set safe moving position of the print head, the print head spraying module 6 starts to act. After the print head spraying module 6 reaches the 3rd position, the sand laying module 7 moves to the sand laying end position and waits.

[0039] After the print head spraying module 6 completes the forward printing and spraying task, the PLC control module 2 issues a reverse sand laying command, and the sand laying Y-axis drive module 44 executes reverse sand laying. When reaching the set vibration sand feeding 2nd position during sand laying, the vibration motor starts to vibrate and feed sand. The sand laying module 7 moves from the end position to the sand laying starting position for sand laying, and repeats the reciprocating motion of sand laying.

[0040] The printing and spraying working process is as follows: When the sand laying module 7 reaches the set safe moving position of the print head, the print head spraying module 6 executes the forward printing process; the print head spraying module 6 moves to the origin 1st position, and then the print head X-axis drive module 41 drives the print head spraying module 6 to move from the 1st position to the 2nd position to execute the spraying and printing task; when reaching the 2nd position, the print head Y-axis drive module 42 drives the print head spraying module 6 to move to the 3rd position and wait. The sand laying module 7 reaches the end and waits, and the print head spraying module 6 moves from the 3rd position to the 4th position and waits.

[0041] After the print head ejection module 6 finishes the forward printing ejection task, the PLC control module 2 issues a reverse printing command, and the print head ejection module 6 executes the reverse printing process. The printing direction of the print head ejection module 6 is from position 4 to position 3 to position 2 for printing, and finally reaches position 1 to wait; if the printing is finished, the print head ejection module 6 moves to the cleaning area to complete the ink pressing and cleaning task, and then returns to the moisturizing waiting area to wait for the next task. If the ejection is not finished, the above-mentioned two-way cyclic printing task is looped.

[0042] In this embodiment, by adopting the two-way cyclic printing control system and method, the manufacturing time of a single-layer sand mold is effectively reduced, and the manufacturing efficiency of the sand mold is improved. This design avoids the idle running stroke, and the whole printing process is more compact and efficient. The printing speed is increased by more than 50% year-on-year, and the single-layer printing time is controlled between 11 and 15 seconds. The full-automatic two-way cyclic printing control system and method significantly improve the efficiency and accuracy of sand mold 3D printing, save costs and improve the product production cycle, providing a new solution for industrial production.

[0043] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all fall within the protection scope of the present invention. In addition, it should be noted that in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0044] In addition, any combination can be made between various different embodiments of the present invention as long as it does not violate the idea of the present invention, and it should also be regarded as the content disclosed by the present invention.

Claims

1. A two-way printing control system for a sand mold 3D printer, characterized in that, It comprises a host computer module (1), a PLC control module (2), a servo control module (3), a servo drive module (4), a network communication unit (5), a print head jet module (6) and a sand laying module (7); The host computer module (1) is respectively connected to the PLC control module (2), the network communication unit (5), the print head jet module (6) and the sand laying module (7) via an industrial network cable, and is used to automatically set and obtain position information of the print head jet module (6) and the sand laying module (7), and automatically send the position information to the PLC control module (2) according to process requirements, and the PLC control module (2) sets printing parameters according to the position information; The network communication unit (5) is respectively connected to the PLC control module (2), the servo control module (3), the print head jetting module (6) and the sanding module (7) via electrical signals, and provides data exchange control between the modules; The servo control module (3) is electrically connected to the servo drive module (4) for acquiring the printing parameters and controlling the servo drive module (4) to drive the print head jetting module (6) and the sanding module (7) to move; The servo drive module (4) is in driving connection with the sand-laying module (7) and the print head jet module (6) so as to drive the sand-laying module (7) and the print head jet module (6) to perform forward or reverse cyclic printing along the X-axis and the Y-axis on the printing platform.

2. The two-way printing control system of the sand mold 3D printer according to claim 1, wherein, The servo drive module (4) comprises a print head X-axis drive module (41), a print head Y-axis drive module (42), a vibration drive module (43), and a sanding Y-axis drive module (44); The print head Y-axis driving module (42) is drivingly connected to the print head X-axis driving module (41), and the print head jetting module (6) is drivingly connected to the print head Y-axis driving module (42); The vibration driving module (43) is arranged on the sand laying module (7), and the sand laying module (7) is transmission-connected to the sand laying Y-axis driving module (44).

3. The two-way printing control system of the sand mold 3D printer according to claim 2, characterized in that, The servo control module (3) comprises a print head X-axis control module, a print head Y-axis control module, a vibration control module, and a sanding Y-axis control module; The print head X-axis control module is used to control the print head X-axis drive module (41) to drive the print head jet module (6) to move along the X-axis of the printing platform, and the print head Y-axis control module is used to control the print head Y-axis drive module (42) to drive the print head jet module (6) to move above the printing platform along the Y-axis; The vibration control module is used to control the vibration drive module (43) to drive the sand-laying module (7) to vibrate and unload materials, and the sand-laying Y-axis control module is used to control the sand-laying Y-axis drive module (44) to drive the sand-laying module (7) to move along the Y-axis above the printing platform.

4. The two-way printing control system of the sand mold 3D printer according to claim 3, wherein, The print head X-axis drive module (41) includes a print head X-axis sliding rail module (411) and a print head X-axis servo motor (412), and the print head X-axis servo motor (412) is drivingly connected to the print head X-axis sliding rail module (411); The print head Y-axis drive module (42) includes a print head Y-axis sliding rail module (421) and a print head Y-axis servo motor (422). The print head Y-axis sliding rail module (421) is drivingly connected to the print head X-axis sliding rail module (411). The print head Y-axis servo motor (422) is drivingly connected to the print head Y-axis sliding rail module (421), and the print head ejection module (6) is drivingly arranged on the print head Y-axis sliding rail module (421); The print head X-axis sliding rail module (411) drives the print head Y-axis sliding rail module (421) to move along the X-axis above the printing platform, and the print head Y-axis sliding rail module (421) drives the print head ejection module (6) to move along the Y-axis above the printing platform.

5. The two-way printing control system of the sand mold 3D printer according to claim 3, characterized in that, The vibration drive module (43) includes a vibration motor arranged on the sand laying module (7).

6. The bidirectional printing control system of the sand mold 3D printer according to claim 5, characterized in that, The sand laying Y-axis drive module (44) includes a sand laying Y-axis servo motor (441), two groups of sand laying Y-axis sliding rail modules (442), and a transmission shaft (443). The two groups of sand laying Y-axis sliding rail modules (442) are respectively arranged on both sides of the printing platform. The sand laying Y-axis servo motor (441) is drivingly connected to any one of the two groups of sand laying Y-axis sliding rail modules (442). The two groups of sand laying Y-axis sliding rail modules (442) are drivingly connected through the transmission shaft (443). The sand laying module (7) is drivingly connected to the two groups of sand laying Y-axis sliding rail modules (442), and the two groups of sand laying Y-axis sliding rail modules (442) drive the sand laying module (7) to move along the Y-axis above the printing platform.

7. The two-way printing control system of the sand mold 3D printer according to claim 6, characterized in that, The sand laying module (7) includes a sand bin (71), a sand storage hopper (72), and a conveyor (73). The sand bin (71) is arranged on the sand laying Y-axis sliding rail module (442). The sand storage hopper (72) is arranged at one end of the sand bin (71). The feeding end of the conveyor (73) extends into the interior of the sand bin (71). The output end of the conveyor (73) is arranged outside the sand bin (71). The bottom of the sand bin (71) is provided with a discharge port, and the vibration motor is drivingly connected to the vibration shaft in the sand bin (71).

8. The two-way printing control system of the sand mold 3D printer according to claim 7, characterized in that, The conveyor (73) is a screw conveyor, including a sand conveying motor (731) and a screw sand conveying shaft (732). The sand conveying motor (731) is arranged at one end of the sand bin (71). The screw sand conveying shaft (732) is arranged in the sand bin (71). The sand conveying motor (731) is drivingly connected to the screw sand conveying shaft (732).

9. The two-way printing control system of the sand mold 3D printer according to claim 1, characterized in that, It further includes a power supply module (8), and the power supply module (8) supplies power to the host computer module (1), the PLC control module (2), the servo control module (3), the servo drive module (4), the network communication unit (5), the print head injection module (6), and the sand spreading module (7).

10. A two-way printing control method for a sand mold 3D printer according to any one of claims 1-9, characterized in that: It includes the following steps: S1: The host computer module (1) automatically sets and obtains the position information of the print head injection module (6) and the sand spreading module (7), and automatically sends the position information to the PLC control module (2) according to the process requirements; S2: The PLC control module (2) obtains the position information and sets the printing parameters through the position information. The printing parameters include the starting position and the ending position of sand spreading, the printing positions 1, 2, 3, and 4 set clockwise along the printing platform, the forward safe movement position of the print head, and the reverse safe movement position of the print head; S3: The servo control module (3) controls the servo drive module (4) to drive the print head injection module (6) and the sand spreading module (7) to move to position 1 and the starting position according to the printing parameters; S4: Obtain a forward printing instruction and replenish sand into the sand spreading module (7); the servo drive module (4) drives the sand spreading module (7) to perform a forward sand spreading operation from the starting position to the ending position. When the sand spreading module (7) reaches the forward safe movement position of the print head, the servo drive module (4) drives the print head injection module (6) to perform a forward injection printing operation from position 1 - position 2 - position 3 in sequence. The sand spreading module (7) moves to the ending position and waits, and the print head injection module (6) moves to position 4 and waits for an instruction; S5: Obtain a reverse printing instruction and replenish sand into the sand spreading module (7); the servo drive module (4) drives the sand spreading module (7) to perform a reverse sand spreading operation from the ending position to the starting position. When the sand spreading module (7) reaches the reverse safe movement position of the print head, the servo drive module (4) drives the print head injection module (6) to perform a reverse injection printing operation from position 4 - position 3 - position 2 in sequence. The sand spreading module (7) moves to the starting position and waits, and the print head injection module (6) moves to position 1 and waits for an instruction; S6: Loop the printing steps of S4 and S5 until the printing is completed.

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