CN120095102B

CN120095102B - Sand mould 3D printer

Info

Publication number: CN120095102B
Application number: CN202510587018.4A
Authority: CN
Inventors: 周敏; 郭卫平
Original assignee: Aistar Intelligent Manufacturing Jiangsu Co ltd
Current assignee: Aistar Intelligent Manufacturing Jiangsu Co ltd
Priority date: 2025-05-08
Filing date: 2025-05-08
Publication date: 2025-07-18
Anticipated expiration: 2045-05-08
Also published as: CN120095102A

Abstract

The present invention relates to the field of casting modeling technology. The sand mold 3D printer comprises a box body, a workbench is arranged inside the box body, a moving avoidance mechanism is arranged on the top of the box body, and cleaning and collecting mechanisms for cleaning the print head are arranged on the front and rear sides of the workbench. The sand spreader and the print head of the present invention respectively use two independent and vertical driving parts as power. After the sand spreader spreads sand in one direction, the print head prints continuously from front to back. After printing, the print head moves to the position of the cleaning and collecting mechanism on the rear side for avoidance. The sand spreader then spreads sand in the reverse direction, and the print head performs reverse continuous printing from back to front, thus realizing two-way sand spreading and two-way printing. Both the sand spreader and the print head have no empty stroke and have high printing efficiency. When the print head is avoiding, the pressure drive component drives the automatic cleaning component to scrape and clean the glue and gravel remaining on the bottom of the print head, and the cleaning mechanism is used to realize the cleaning of the bottom of the scraper.

Description

Sand mould 3D printer

Technical Field

The invention belongs to the technical field of casting modeling, and particularly relates to a sand mold 3D printer.

Background

Sand mould 3D printers are a device for sand moulds for casting processes, this type of 3D printing using a technique called adhesive spraying, by which the required sand mould is built layer by selectively depositing a liquid adhesive onto a layer of sand, sand mould 3D printers being mainly used in the fields of automotive manufacture, aerospace, mechanical engineering etc.

1. The printing head and the sand paving mechanism in the existing sand mold 3D printer commonly share one track to move, after the sand paving mechanism lays a layer of fine sand along the track, the sand paving mechanism needs to avoid along the track to the initial position, at the moment, the printing head needs to avoid along the track after the printing is finished, the printing head also needs to return to the initial position along the track to avoid, and the sand paving operation is repeated, so that sand mold 3D printing is completed, however, the printing mode, the sand paving mechanism and the printing head all have a section of idle stroke, and the printing efficiency is reduced.

2. The existing sand mould 3D printer is after the sanding, utilize the scraper blade to carry out the strickle processing to the sand bed of laying generally, because the foundry sand that is used for printing carries out the sanding with the gel after preliminary mixing before laying generally, thereby foundry sand itself has certain viscidity, thereby the condition of local adhesion gravel appears easily when the scraper blade is scraped, influence the effect of scraping at the time next, cause the condition of local unevenness when scraping at the time next easily, thereby need clear up the scraper blade bottom, current clearance mode is usually clear up with the brush, but under long-term use condition, easy adhesion gravel on the brush, the gravel on the brush can influence the cleanness of scraper blade.

Disclosure of Invention

The invention aims to solve the problems and provide the sand mold 3D printer which is simple in structure and reasonable in design.

The invention realizes the above purpose through the following technical scheme:

The utility model provides a sand mould 3D printer, includes the box, the inside workstation that is provided with of box, the box top is provided with removes and dodges the mechanism, both sides all are provided with clean receiving mechanism around the workstation, two spacing grooves have been seted up to the symmetry around on the workstation, and the workstation bottom is located spacing groove below and has set firmly No. two electronic slide rails, no. two electronic slide rails have connecting rods through No. two electronic slider slidable mounting, two mounting grooves and two sand leakage grooves have been seted up to the bilateral symmetry on workstation top, be provided with clean mechanism jointly on mounting groove inside and the No. two electronic slide rails;

The movable avoidance mechanism comprises two side plates which are fixedly connected to the two sides of the top of the box body in a bilateral symmetry mode, a screw rod is connected between the two side plates in a rotating mode, a servo motor is fixedly installed on the side plate located on the right side, the output end of the servo motor is fixedly connected with the right end of the screw rod, a movable block is connected to the screw rod through a ball nut in a threaded mode, a third electric sliding rail is fixedly installed at the bottom of the movable block, a printing head is slidingly connected to the bottom of the third electric sliding rail through the third electric sliding block, the foremost end and the rearmost end of the third electric sliding rail are positions where the printing head dodges the sand spreader, a limiting plate is fixedly installed at the top of the movable block, a second guide rod penetrates through the middle of the limiting plate in a sliding mode, and the second guide rod is arranged between the two side plates.

Preferably, the right side of the top of the box body is provided with a hopper, the hopper is connected with the sand mixing box through a pipeline, the center of the top of the workbench is provided with a second mounting groove, the tops of the two connecting rods are jointly provided with a sand spreader, the left side and the right side of the sand spreader are symmetrically and fixedly provided with two fixing arms, the bottoms of the two fixing arms are fixedly connected with a first top plate, and the bottoms of the first top plate are fixedly provided with scraping plates.

Preferably, the through hole that runs through around having been seted up to the box lower part, and box below bilateral symmetry is provided with two electronic slide rails, two electronic slide rail tops have lift sand boxes through the common sliding connection of electronic slider, lift sand box has two, lift sand box includes the bottom plate at electronic slider top of fixed connection, bottom plate top four corners respectively fixed mounting have a pneumatic cylinder, a plurality of pneumatic cylinder tops are provided with the sand box body jointly, the inside bottom surface center fixed mounting of sand box body has No. two pneumatic cylinders, no. two pneumatic cylinder output top fixed mounting have the lifter plate, the sealed sliding connection of lifter plate is inside the sand box body.

Preferably, the clean receiving mechanism includes the empty box of keeping away of fixed mounting on the workstation, keeps away one side that the workstation was kept away from to empty box bottom and has set firmly to collect and fight, collects and keeps away the inside intercommunication of empty box, keeps away from one side that the workstation was kept away from to empty box and is provided with drive assembly, and is provided with automatically cleaning subassembly jointly between drive assembly and the empty box, and the equal fixed mounting in both sides bottom has a dead lever around the print head.

Preferably, the drive assembly includes bilateral symmetry fixed connection keeps away two mounts of workstation one side in keeping away from the empty box, joint rotation is connected with the installation axle between two mounts, gear has been cup jointed in the installation axle middle part fixed, two mount tops and joint fixedly connected with roof No. two, roof bottom center fixed mounting No. two has a spacing slider, a spacing slider bottom sliding connection has a spacing slide rail, a spacing slide rail bottom fixed mounting has a rack No. two with gear top meshing, a spacing slide rail is kept away from one side fixed mounting who keeps away from the empty box has the dog, keep away from empty box one side middle part slip and run through there is movable picture peg, movable picture peg is kept away from one side fixed mounting who has with a gear bottom meshing, the movable picture peg other end is provided with self-cleaning assembly.

Preferably, the automatic cleaning component comprises a supporting plate fixedly connected to the other end of the movable plugboard, a cleaning scraper is fixedly arranged at the top of the supporting plate, a guide rod is arranged on the left side and the right side of the supporting plate in a sliding and penetrating mode, a spring is sleeved on the guide rod and arranged between the supporting plate and the inner wall of the hollow box, two portal frames are fixedly arranged on one side of the top of the hollow box, far away from the workbench, of the side of the bilateral symmetry mode, and conical cleaning plates for cleaning the top of the cleaning scraper are fixedly arranged on the top of the inner wall of the two portal frames.

Preferably, a collecting box is arranged below the two sand leakage grooves, a blocking cover is fixedly arranged on one side, far away from the center of the workbench, of the top of the first mounting groove, and supporting legs are fixedly arranged at four corners of the bottom of the workbench respectively.

Preferably, the cleaning mechanism comprises two brush rollers which are rotatably connected in the first mounting groove and used for cleaning the bottom of the scraping plate, and the front ends of the two brush rollers are fixedly sleeved with a second gear.

Preferably, the front side wall inside the first mounting groove is rotationally connected with a fixed shaft, and a third gear meshed with the two second gears is fixedly sleeved on the fixed shaft.

Preferably, two one sides of the second electric sliding rail, which are close to each other, are fixedly provided with second limiting sliding rails, two second limiting sliding blocks are connected to the two second limiting sliding rails in a sliding manner, the second limiting sliding blocks are connected with the second electric sliding blocks on the second electric sliding rails through connecting arms, and third racks meshed with the bottoms of the third gears are fixedly arranged on the connecting arms on the front sides.

The invention has the beneficial effects that:

1. according to the invention, the two mutually independent and vertical driving parts are respectively adopted as power for the sand spreader and the printing head, after the sand spreader carries out one-way sand spreading, the printing head prints, after printing, the printing head moves to the position of the clean material receiving mechanism to avoid, the sand spreader carries out reverse sand spreading, the printing head carries out reverse printing, the bidirectional sand spreading bidirectional printing is realized, the sand spreader and the printing head have no idle stroke, and the printing efficiency is improved.

2. According to the invention, when the printing head enters the cleaning receiving mechanism for avoiding the space, the first fixed rod on the printing head extrudes the driving assembly to drive the cleaning scraper in the automatic cleaning assembly to scrape and clean the residual glue solution and sand on the bottom of the printing head, and after scraping and cleaning, the cleaning scraper is reset along with the leaving of the printing head, the conical cleaning plate scrapes and cleans the top of the cleaning scraper in the resetting process, and impurities on the conical cleaning plate fall into the collecting hopper under the action of gravity, so that the cleaning of the bottom of the printing head and the automatic cleaning of the cleaning scraper are realized, and the condition that the cleaning efficiency is reduced due to excessive impurities remained on the cleaning scraper is avoided.

3. According to the sand spreader, when the second electric sliding rail drives to retract to the left side and the right side from the working area, the second electric sliding rail synchronously drives the third rack to retract, the third rack is meshed with the third gear to indirectly drive the brush roller to rotate towards the blocking cover, cleaning of the bottom of the scraping plate is achieved through rotation of the brush roller, meanwhile, impurities remained on the brush roller are centrifugally thrown out when the brush roller rotates, the problem that cleaning effect is reduced due to impurities accumulated on the brush roller is avoided, and air flow generated by rotation of the brush roller further cleans the bottom of the scraping plate in a blowing mode.

Drawings

FIG. 1 is a perspective view of the overall structure of the present invention;

FIG. 2 is a partial cross-sectional view of the overall structure of the present invention;

FIG. 3 is a partial cross-sectional view of the lift flask of the present invention;

FIG. 4 is a perspective view of the mobile avoidance mechanism, table, clean take-up mechanism and cleaning mechanism of the present invention;

FIG. 5 is a partial cross-sectional view of the clean take-up mechanism of the present invention;

FIG. 6 is an enlarged schematic view of area A of FIG. 5 in accordance with the present invention;

FIG. 7 is a perspective view, partially in section, of the cleaning mechanism and table of the present invention;

FIG. 8 is an enlarged schematic view of area B of FIG. 7 in accordance with the present invention;

FIG. 9 is a partial cross-sectional elevation view of the cleaning mechanism and table of the present invention.

In the figure, 1, a box body; 2, a charging hopper; 3, a first electric sliding rail; lifting sand boxes, 41, bottom plates, 42, sand box bodies, 43, a first hydraulic cylinder, 44, lifting plates, 45, a second hydraulic cylinder, 5, a cleaning receiving mechanism, 51, a driving component, 511, a first rack, 512, a mounting shaft, 513, a first gear, 514, a fixing frame, 515, a first limiting slide rail, 516, a second rack, 517, a second top plate, 518, a first limiting slide block, 519, a movable plugboard, 52, a collecting hopper, 53, an automatic cleaning component, 531, a first spring, 532, a first guide rod, 533, a portal frame, 534, a cleaning scraper, 535, a bearing plate, 536, a conical cleaning plate, 54, a first fixing rod, 55, a blank box, 6, a moving avoidance mechanism, 61, a side plate, 62, a second guide rod, 63, a screw, 64, a movable block, 65, a limiting plate, 66, a third electric slide rail, 67, a servo motor, 7, a cleaning mechanism, 71, a brush roller, 72, a second gear, 73, a third gear, 74, a third slide rail, 75, a second slide rail, a second guide arm, a guide plate, a moving guide plate, a guide rail, a 6, a moving rail, a lifting rail, a slide rail, a moving rail, a slide rail, a moving, a slide rail, a and a, a slide rail, a slide rail, a, a the moving a the moving the swing-a the swing-.

Detailed Description

The present application will be described in further detail with reference to the accompanying drawings, wherein it is to be understood that the following detailed description is for the purpose of further illustrating the application only and is not to be construed as limiting the scope of the application, as various insubstantial modifications and adaptations of the application to those skilled in the art can be made in light of the foregoing disclosure.

Referring to fig. 1,2 and 4, a sand mold 3D printer includes a box 1, a workbench 13 is disposed inside the box 1, a moving avoiding mechanism 6 is disposed at the top of the box 1, cleaning material collecting mechanisms 5 for cleaning a print head 15 are disposed at front and rear sides of the workbench 13, two cleaning material collecting mechanisms 5 are distributed symmetrically around the center of the workbench 13, two limit grooves 9 are formed on the workbench 13 in a front and rear symmetrical manner, a second electric slide rail 10 is fixedly disposed below the limit groove 9 at the bottom of the workbench 13, two second electric slide rails 10 are slidably mounted with connecting rods 19 through second electric slide blocks, a sand spreader 12 is disposed at the top of the two connecting rods 19, a first top plate 18 is fixedly mounted at the bottom of the two fixing arms 16, a scraping plate 17 is fixedly disposed at the bottom of the first top plate 18, adjusting screws (not shown in the figure) are mounted on the first top plate 18, a left side and a right side of the workbench 13 are provided with two limit grooves 11, a first hopper 11 is mounted at the bottom of the two side of the workbench, a second hopper 11 is mounted at the bottom of the two hopper 13, two hopper grooves 20 are fixedly mounted at the bottom of the two hopper 11 are mounted at the top of the two side of the workbench 12, two hopper grooves 20 are mounted at the top of the two hopper 13 are fixedly separated from the top of the workbench, and two hopper 11 is mounted at the top of the two hopper 11 is fixedly mounted at the top of the two hopper 11.

In the use process of the invention, the sand mixing box and the hopper 2 are used for conveying mixed gravel into the sand spreader 12, the sand spreader 12 is used for spreading the gravel uniformly to a printing area, the sand spreader 12 can spread the gravel bidirectionally and can be scraped bidirectionally, the scraping plate 17 is used for scraping the paved gravel, the cleaning mechanism 7 is used for brushing and cleaning the bottom of the scraping plate 17, and the cleaning and collecting mechanism 5 is used for cleaning the printing head 15 and automatically collecting impurities.

Referring to fig. 2, 3 and 4, a through hole penetrating through the lower portion of the box 1 is formed in the lower portion of the box 1, two first electric sliding rails 3 are symmetrically arranged below the box 1 in a left-right mode, the tops of the two first electric sliding rails 3 are connected with a lifting sand box 4 in a sliding mode through the first electric sliding blocks, the two lifting sand boxes 4 are connected to the first electric sliding rails 3 in a sliding mode, the lifting sand box 4 comprises a bottom plate 41 fixedly connected to the top of the first electric sliding blocks, four corners of the top of the bottom plate 41 are fixedly provided with first hydraulic cylinders 43 respectively, sand box bodies 42 are arranged at the tops of the first hydraulic cylinders 43 in a fixed mode, second hydraulic cylinders 45 are fixedly arranged at the centers of the bottoms of the interiors of the sand box bodies 42, lifting plates 44 are fixedly arranged at the tops of the output ends of the second hydraulic cylinders 45, and the lifting plates 44 are connected to the interiors of the sand box bodies 42 in a sealing and sliding mode.

During the use, start electronic slide rail 3 No. one, electronic slide rail 3 is carried to No. two mounting grooves 14 under through electronic slider No. one, start the pneumatic cylinder 43 this moment, the extension of pneumatic cylinder 43 output, drive sand box body 42 and No. two pneumatic cylinders 45 on it upward movement, until sand box body 42 top edge and No. two mounting grooves 14 top parallel and level, start No. two pneumatic cylinders 45 this moment, no. two pneumatic cylinders 45 output extension, drive lifter plate 44 upward movement, lifter plate 44 and sand box body 42 top edge's distance is the thickness of laying the grit, every time lay the grit, no. two pneumatic cylinders 45 output decline one end distance, the distance that descends is the thickness of laying the grit, move and dodge mechanism 6 and No. two electronic slide rails 10 are ninety degrees vertical distributions, the sand spreader 12 moves through No. two electronic slide rails 10, the print head 15 is driven through moving dodge mechanism 6, move and dodge the front and back both ends of mechanism 6 and dodge the position, promptly when print head 15 moves to dodge the position, the sand spreader 12 can slide smoothly along No. two electronic slide rails 10, no. 12 does not interfere with print head 12, thereby the idle running efficiency has appeared, no. 15 has no interference between print head 12 and print head 12.

Referring to fig. 2 and 4, the moving avoidance mechanism 6 includes two side plates 61 symmetrically and fixedly connected on two sides of the top of the box 1, a screw rod 63 is rotatably connected between the two side plates 61, a servo motor 67 is fixedly mounted on the side plate 61 located on the right side, an output end of the servo motor 67 is fixedly connected with the right end of the screw rod 63, a movable block 64 is connected on the screw rod 63 through a ball nut thread, a third electric slide rail 66 is fixedly mounted at the bottom of the movable block 64, a printing head 15 is slidingly connected at the bottom of the third electric slide rail 66 through the third electric slide block, a limit plate 65 is fixedly mounted at the top of the movable block 64 at the foremost end and the rearmost end of the third electric slide rail 66, a second guide rod 62 is slidingly penetrated in the middle of the limit plate 65, and the second guide rod 62 is arranged between the two side plates 61.

When in use, the servo motor 67 is started firstly, the output end of the servo motor 67 drives the screw rod 63 to rotate, the movable block 64 and the third electric sliding rail 66 on the movable block 64 are synchronously driven to slide left and right along the second guide rod 62, meanwhile, the third electric sliding rail 66 and the third electric sliding rail on the third electric sliding rail drive the printing head 15 to slide back and forth, the movement of the printing head 15 is realized, the movement avoidance mechanism 6 moves the printing head 15 to the top of the clean receiving mechanism 5 positioned at the front side before sand paving, the avoidance of the printing head 15 to the sand spreader 12 is realized, the sand spreader 12 is driven to move from right to left by the second electric sliding rail 10 at this moment, fine sand is stored in the sand spreader 12, the sand spreading is started when the sand spreader 12 moves to the right side of the top of the lifting plate 44, the sand spreading is stopped when the sand spreader moves to the left side of the lifting plate 44, the fine sand required by printing is uniformly paved to the top of the lifting plate 44, the scraping plate 17 is used for scraping gravel during laying and spreading sand from right to left, the scraping plate 17 on the right is used for scraping and scraping excessive fine sand into the sand leakage groove 20 during scraping from right to left, the excessive fine sand falls into the collecting box through the sand leakage groove 20 to be collected, the quantity of fine sand entering into the cleaning mechanism 7 is reduced, the printing head 15 is driven to continuously move back and forth by the moving avoidance mechanism 6 at the moment, the curing agent is coated on the appointed area of the gravel according to the design shape, after one layer of printing is finished, the moving avoidance mechanism 6 moves the printing head 15 to the top of the cleaning material collecting mechanism 5 on the rear side to avoid, at the moment, the sand spreader 12 spreads sand from left to back, then the printing head 15 continuously prints from back to front, the printing is completed by spreading glue layer by layer according to the design shape, the two-way printing is realized, the printing of the printing head 15 and the sand spreader 12 have no idle stroke, the printing efficiency is improved, and when the sand spreader 12 reciprocates for one cycle, the sand spreader 12 is fed with sand by the hopper 2 and returns to the right.

Referring to fig. 4 and 5, the cleaning and receiving mechanism 5 includes an empty avoiding box 55 fixedly installed on the workbench 13, a collecting hopper 52 is fixedly installed at one side of the bottom of the empty avoiding box 55 far away from the workbench 13, the collecting hopper 52 is communicated with the inside of the empty avoiding box 55, a driving assembly 51 is arranged at one side of the empty avoiding box 55 far away from the workbench 13, an automatic cleaning assembly 53 is jointly arranged between the driving assembly 51 and the empty avoiding box 55, and a first fixing rod 54 is fixedly installed at the bottoms of the front side and the rear side of the printing head 15.

Referring to fig. 4 and 5, the driving assembly 51 includes two fixing frames 514 symmetrically and fixedly connected to a side of the space avoiding box 55 far away from the workbench 13, a mounting shaft 512 is rotatably connected between the two fixing frames 514, a first gear 513 is fixedly sleeved in the middle of the mounting shaft 512, a second top plate 517 is fixedly connected to the top of the two fixing frames 514, a first limit sliding block 518 is fixedly installed at the center of the bottom of the second top plate 517, a first limit sliding rail 515 is slidably connected to the bottom of the first limit sliding block 518, a second rack 516 engaged with the top of the first gear 513 is fixedly installed at the bottom of the first limit sliding rail 515, a stop is fixedly installed at the side of the first limit sliding rail 515 far away from the space avoiding box 55, a movable plugboard 519 is slidably penetrated in the middle of the side of the space avoiding box 55 far away from the workbench 13, a first rack 511 engaged with the bottom of the first gear 513 is fixedly installed at the side of the movable plugboard 519, and an automatic cleaning assembly 53 is arranged at the other end of the movable plugboard 519.

Referring to fig. 4, 5 and 6, the automatic cleaning component 53 includes a support plate 535 fixedly connected to the other end of the movable insert plate 519, a cleaning blade 534 is fixedly provided at the top of the support plate 535, a first guide rod 532 is slidably inserted through the left and right sides of the support plate 535, the first guide rod 532 is disposed inside the space avoiding box 55, a first spring 531 is sleeved on the first guide rod 532, the first spring 531 is disposed between the support plate 535 and the inner wall of the space avoiding box 55, two portals 533 are fixedly mounted on the top of the space avoiding box 55, which is far from the side of the workbench 13, and a tapered cleaning plate 536 for cleaning the top of the cleaning blade 534 is fixedly mounted on the top of the inner wall of the two portals 533.

When the automatic cleaning device is used, when the moving avoidance mechanism 6 drives the printing head 15 to move to the avoidance position, the first fixing rod 54 on the printing head 15 extrudes the second rack 516, the second rack 516 is driven to move towards the direction away from the workbench 13, the first rack 511 and the movable plugboard 519 on the second rack are indirectly driven to move towards the workbench 13, meanwhile, the supporting plate 535 and the cleaning scraper 534 on the supporting plate are driven to move towards the workbench 13, the first spring 531 is synchronously compressed, sundries such as gravel and glue at the bottom of the printing head 15 are cleaned and scraped by the cleaning scraper 534, automatic cleaning of the printing head 15 is achieved, manual participation is not needed, time and labor are saved, and after the printing head 15 leaves, the cleaning scraper 534 on the supporting plate 535 is driven to move backwards towards the direction away from the workbench 13 under the action of the restoring force of the first spring 531, the cleaning scraper 534 passes through the bottom of the conical cleaning plate 536, the top of the cleaning scraper 534 is cleaned by the conical cleaning plate 536, residual impurities on the cleaning scraper 534 are prevented from affecting the next cleaning, the gravity on the conical cleaning plate 536 is used for extruding the impurities under the cleaning blade 534, and the self-cleaning hopper 52 is automatically cleaned and automatically, and the self-cleaning of the printing head is achieved.

Referring to fig. 4, 7, 8 and 9, the cleaning mechanism 7 includes two brush rollers 71 rotatably connected in a first mounting groove 11 for cleaning the bottom of the scraper 17, two gears 72 are fixedly sleeved at the front ends of the two brush rollers 71, a fixed shaft 76 is rotatably connected to the front side wall in the first mounting groove 11, and a third gear 73 meshed with the two gears 72 is fixedly sleeved on the fixed shaft 76.

Referring to fig. 2, 7, 8 and 9, two second electric sliding rails 10 are fixedly mounted on two sides of the second electric sliding rails, which are close to each other, respectively, a second limiting sliding rail 75 is slidably connected to the second limiting sliding rail 75, the second limiting sliding rail 77 is connected to the second electric sliding rail on the second electric sliding rail 10 through a connecting arm 78, and a third rack 74 engaged with the bottom of the third gear 73 is fixedly mounted on the connecting arm 78 at the front side.

When the sand spreader 12 is driven by the second electric sliding rail 10 to spread sand from right to left or from left to right along the limit groove 9, the fixing arm 16 and the first top plate 18 on the fixing arm 16 are synchronously driven to slide, meanwhile, the scraping plate 17 is driven to scrape fine sand, the second electric sliding rail 10 drives the second electric sliding block and the connecting arm 78 on the second electric sliding block to move continuously, the second limit sliding block 77 and the third rack 74 on the second electric sliding block are driven to move simultaneously, the third gear 73 is driven to rotate, the gear ratio of the third gear 73 to the second gear 72 is six, the second gear 72 and the brush roller 71 on the second gear are driven to rotate at a high speed, residual gravel on the brush roller 71 is discharged through centrifugal force during rotation cleaning, the blocking cover 8 blocks the thrown gravel, the residue on the brush roller 71 is reduced, the influence of the residual fine sand on the brush roller 71 on the cleaning effect of the scraping plate 17 is avoided, and further cleaning of the bottom of the scraping plate 17 is realized by wind generated during rotation of the brush roller 71.

When the sand mould 3D printer is used, firstly, the first electric slide rail 3 is started, the first electric slide rail 3 conveys the lifting sand box 4 to the position right below the second mounting groove 14 through the first electric slide block, at the moment, the first hydraulic cylinder 43 is started, the output end of the first hydraulic cylinder 43 stretches to drive the sand box body 42 and the second hydraulic cylinder 45 arranged on the sand box body to move upwards until the upper edge of the sand box body 42 is flush with the top of the second mounting groove 14, at the moment, the second hydraulic cylinder 45 is started, the output end of the second hydraulic cylinder 45 stretches to drive the lifting plate 44 to move upwards, the distance between the lifting plate 44 and the top edge of the sand box body 42 is the thickness of paving gravel, before sanding, the moving avoidance mechanism 6 moves the printing head 15 to the top of the cleaning and collecting mechanism 5 positioned at the front side, at the moment, the sand spreader 12 is driven to move from right to left through the second electric slide rail 10, until gravel is evenly paved on the top of the lifting plate 44, the gravel is paved, meanwhile, the scraping plate 17 scrapes the gravel, at the moment, the moving avoidance mechanism 6 is used for driving the printing head 15 to continuously move forwards and backwards, the curing agent is coated on a designated area of the gravel according to a design shape, after one layer of printing is finished, the moving avoidance mechanism 6 moves the printing head 15 to the top of the clean receiving mechanism 5 at the rear side to avoid, at the moment, the sand spreader 12 spreads sand from left to back, then the printing head 15 continuously prints from back to front, bidirectional sand spreading and bidirectional printing are realized, the printing head 15 and the sand spreader 12 have no idle stroke, the printing efficiency is improved, after the printing is finished, the printed lifting sand box 4 is moved out of a working area by the first electric sliding rail 3, the new lifting sand box 4 is moved to the working area, the alternate work of the double lifting sand boxes 4 is realized, the working efficiency is high, and when the printing head 15 is used, utilize clean receiving mechanism 5 to the automatically cleaning of printing head 15 and the automatic collection of impurity, need not artifical the participation, labour saving and time saving, when the sanding ware 12 sanding, utilize clean mechanism 7 to brush the cleanness to scraper 17 bottom, and clean mechanism 7 and No. two electronic slide rail 10 linkage, the rotatory clean action of clean mechanism 7 need not to establish the drive source in addition, and rotatory centrifugal force has realized the self-cleaning of clean mechanism 7 itself.

The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.

Claims

1. A sand mold 3D printer comprises a box body (1) and is characterized in that a workbench (13) is arranged inside the box body (1), a movable avoidance mechanism (6) is arranged at the top of the box body (1), a cleaning and receiving mechanism (5) is arranged on the front side and the rear side of the workbench (13), two limit grooves (9) are symmetrically formed in the workbench (13) in a front-rear mode, a second electric sliding rail (10) is fixedly arranged below the limit grooves (9) at the bottom of the workbench (13), a connecting rod (19) is slidably arranged on the two second electric sliding rails (10) through the second electric sliding blocks, two first installation grooves (11) and two sand leakage grooves (20) are symmetrically formed in the top of the workbench (13), and a cleaning mechanism (7) is jointly arranged inside the first installation grooves (11) and on the second electric sliding rails (10);

the movable avoidance mechanism (6) comprises two side plates (61) which are symmetrically and fixedly connected on two sides of the top of the box body (1), a screw rod (63) is connected between the two side plates (61) in a rotating mode, a servo motor (67) is fixedly installed on the side plate (61) located on the right side, the output end of the servo motor (67) is fixedly connected with the right end of the screw rod (63), a movable block (64) is connected to the screw rod (63) through a ball nut thread, a third electric sliding rail (66) is fixedly installed at the bottom of the movable block (64), a printing head (15) is connected to the bottom of the third electric sliding rail (66) through the third electric sliding block in a sliding mode, the foremost end and the rearmost end of the third electric sliding rail (66) are avoidance positions of the printing head (15) on the sand spreader (12), a limiting plate (65) is fixedly installed at the top of the movable block (64), a second guide rod (62) is fixedly installed in a sliding mode in the middle of the limiting plate (65), and the second guide rod (62) is arranged between the two side plates (61);

The cleaning and collecting mechanism (5) comprises an empty avoiding box (55) fixedly installed on the workbench (13), a collecting hopper (52) is fixedly arranged at one side, far away from the workbench (13), of the bottom of the empty avoiding box (55), the collecting hopper (52) is communicated with the inside of the empty avoiding box (55), a driving assembly (51) is arranged at one side, far away from the workbench (13), of the empty avoiding box (55), an automatic cleaning assembly (53) is jointly arranged between the driving assembly (51) and the empty avoiding box (55), and a first fixing rod (54) is fixedly installed at the bottoms of the front side and the rear side of the printing head (15);

the driving assembly (51) comprises two fixing frames (514) which are symmetrically and fixedly connected on one side, far away from the workbench (13), of the empty-keeping box (55), a mounting shaft (512) is fixedly connected between the two fixing frames (514) in a rotating mode, a first gear (513) is fixedly sleeved in the middle of one side of the mounting shaft (512), the tops of the two fixing frames (514) are fixedly connected with a second top plate (517) in a connecting mode, a first limit sliding block (518) is fixedly arranged at the center of the bottom of the second top plate (517), a first limit sliding rail (515) is slidably connected at the bottom of the first limit sliding block (518), a second rack (516) meshed with the top of the first gear (513) is fixedly arranged at the bottom of the first limit sliding rail (515), a stop is fixedly arranged on one side, far away from the empty-keeping box (55), far away from the workbench (13), a movable plug board (511) is fixedly arranged in a sliding mode at the middle of one side, far away from the workbench (13), of the movable plug board (519), a first rack (511) meshed with the bottom of the first gear (513), and the other end of the movable plug board (519) is provided with an automatic cleaning assembly (53).

2. The sand mold 3D printer according to claim 1, wherein a feeding hopper (2) is arranged on the right side of the top of the box body (1), the feeding hopper (2) is connected with a sand mixing box through a pipeline, a second mounting groove (14) is formed in the center of the top of the workbench (13), a sand spreader (12) is jointly arranged at the tops of the two connecting rods (19), two fixing arms (16) are symmetrically and fixedly arranged on the left side and the right side of the sand spreader (12), a first top plate (18) is fixedly connected to the bottoms of the two fixing arms (16), and a scraping plate (17) is fixedly arranged at the bottoms of the first top plate (18).

3. The sand mold 3D printer of claim 1, wherein the through holes penetrating through the front and rear parts are formed in the lower portion of the box body (1), two first electric sliding rails (3) are symmetrically arranged below the box body (1), the tops of the two first electric sliding rails (3) are connected with lifting sand boxes (4) in a sliding mode through the first electric sliding blocks, the lifting sand boxes (4) are two, each lifting sand box (4) comprises a bottom plate (41) fixedly connected to the tops of the first electric sliding blocks, first hydraulic cylinders (43) are fixedly arranged at four corners of the tops of the bottom plates (41) respectively, sand box bodies (42) are commonly arranged at the tops of the first hydraulic cylinders (43), second hydraulic cylinders (45) are fixedly arranged at the centers of the bottoms of the sand box bodies (42), lifting plates (44) are fixedly arranged at the tops of the output ends of the second hydraulic cylinders (45), and the lifting plates (44) are in a sealing sliding mode and connected to the bottoms of the sand box bodies (42).

4. The sand mold 3D printer according to claim 1, wherein the automatic cleaning assembly (53) comprises a supporting plate (535) fixedly connected to the other end of the movable insertion plate (519), cleaning blades (534) are fixedly arranged at the tops of the supporting plate (535), a first guide rod (532) is slidably penetrated through the left side and the right side of the supporting plate (535), the first guide rod (532) is arranged inside the empty-avoiding box (55), a first spring (531) is sleeved on the first guide rod (532), the first spring (531) is arranged between the supporting plate (535) and the inner wall of the empty-avoiding box (55), two portals (533) are fixedly arranged on one side, far away from the workbench (13), of the tops of the empty-avoiding box (55) in a bilateral symmetry mode, and conical cleaning plates (536) for cleaning the tops of the cleaning blades (534) are fixedly arranged on the tops of the inner walls of the two portals (533) together.

5. The sand mold 3D printer according to claim 1, wherein a collecting box is arranged below the two sand leakage grooves (20), a blocking cover (8) is fixedly arranged on one side, far away from the center of the workbench (13), of the top of each first installation groove (11), and supporting legs are fixedly arranged at four corners of the bottom of the workbench (13).

6. The sand mold 3D printer according to claim 1, wherein the cleaning mechanism (7) comprises two brush rollers (71) which are rotatably connected inside a first mounting groove (11) and used for cleaning the bottom of the scraping plate (17), and a second gear (72) is fixedly sleeved at the front ends of the two brush rollers (71).

7. The sand mold 3D printer according to claim 6, wherein the front side wall inside the first mounting groove (11) is rotatably connected with a fixed shaft (76), and a third gear (73) meshed with the two second gears (72) is fixedly sleeved on the fixed shaft (76).

8. The sand mold 3D printer according to claim 6, wherein two second electric sliding rails (10) are fixedly arranged on one sides, close to each other, of the second limiting sliding rails (75), second limiting sliding blocks (77) are connected to the two second limiting sliding rails (75) in a sliding mode, the second limiting sliding blocks (77) are connected with the second electric sliding blocks on the second electric sliding rails (10) through connecting arms (78), and third racks (74) meshed with the bottoms of the third gears (73) are fixedly arranged on the connecting arms (78) on the front sides.