Sand mold 3D printer

Abstract

The sand mold 3D printer relates to the technical field of casting molding, and comprises a box body, a workbench is arranged in the box body, a moving avoiding mechanism is arranged at the top of the box body, and cleaning and material collecting mechanisms used for cleaning a printing head are arranged on the front side and the rear side of the workbench correspondingly. The sanding device and the printing head respectively adopt two mutually independent and vertical driving parts as power, after the sanding device performs unidirectional sanding, the printing head performs continuous printing from front to back, after printing, the printing head moves to the position of the rear cleaning and receiving mechanism for avoiding, and then the sanding device performs reverse sanding, so that the printing efficiency is improved. The printing head conducts reverse continuous printing from back to front, two-way sanding and two-way printing are achieved, the sanding device and the printing head are free of idle stroke, the printing efficiency is high, when the printing head conducts avoiding, the pressure driving assembly drives the automatic cleaning assembly to scrape and clean glue liquid and gravel remaining at the bottom of the printing head, and therefore the printing efficiency is improved. And the bottom of the scraping plate is cleaned through the cleaning mechanism.

Description

Technical Field

[0001] The invention belongs to the technical field of casting modeling, and in particular relates to a sand mold 3D printer. Background Art

[0002] A sand 3D printer is a device used for sand molds in casting processes. This type of 3D printing utilizes a technology called binder jetting, which selectively deposits a liquid binder onto a layer of sand to build the desired sand mold layer by layer. Sand 3D printers are mainly used in automotive manufacturing, aerospace, mechanical engineering and other fields.

[0003] 1. The print head and the sand-laying mechanism in the existing sand mold 3D printer usually share a track for movement. After the sand-laying mechanism lays a layer of fine sand along the track, the sand-laying mechanism needs to move along the track to the initial position for avoidance. At this time, the print head prints along the track. After printing is completed, the print head also needs to return to the initial position along the track for avoidance, and repeat the above-mentioned sand-laying operation to complete the sand mold 3D printing. However, in this printing method, the sand-laying mechanism and the print head both have an idle stroke, which reduces the printing efficiency.

[0004] 2. After sanding, the existing sand mold 3D printer usually uses a scraper to level the laid sand layer. Since the casting sand used for printing is usually preliminarily mixed with gel before laying, the casting sand itself has a certain viscosity, so it is easy for the scraper to adhere to the sand locally when leveling, affecting the effect of the next leveling, and easily causing local unevenness during the next leveling. Therefore, it is necessary to clean the bottom of the scraper. The existing cleaning method is usually to use a brush for cleaning. However, after long-term use, the brush is prone to adhere to the sand, and the sand on the brush will affect the cleaning of the scraper. Summary of the invention

[0005] The purpose of the present invention is to provide a sand mold 3D printer with a simple structure and reasonable design in order to solve the above problems.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions: A sand mold 3D printer, comprising a box, a workbench is arranged inside the box, a moving avoidance mechanism is arranged on the top of the box, cleaning and material receiving mechanisms are arranged on both the front and rear sides of the workbench, two limit slots are symmetrically arranged on the front and rear sides of the workbench, and a No. 2 electric slide rail is fixedly arranged below the limit slot at the bottom of the workbench, and the two No. 2 electric slide rails are both slidably installed with connecting rods through the No. 2 electric slider, two No. 1 installation slots and two sand leakage slots are symmetrically arranged on the top of the workbench, and a cleaning mechanism is arranged inside the No. 1 installation slot and on the No. 2 electric slide rail; The movable avoidance mechanism includes two side panels that are symmetrically fixedly connected to both sides of the top of the box body, a lead screw is connected to the two side panels for common rotation, a servo motor is fixedly installed on the side panel on the right, the output end of the servo motor is fixedly connected to the right end of the lead screw, a movable block is threadedly connected to the lead screw through a ball nut, a No. 3 electric slide rail is fixedly installed on the bottom of the movable block, a print head is slidably connected to the bottom of the No. 3 electric slide rail through a No. 3 electric slider, and the front end and the rear end of the No. 3 electric slide rail are the avoidance positions of the print head to the sand spreader, a limit plate is fixedly installed on the top of the movable block, a No. 2 guide rod slides through the middle of the limit plate, and the No. 2 guide rod is arranged between the two side panels.

[0007] Preferably, a feeding hopper is provided on the right side of the top of the box body, and the feeding hopper is connected to the sand mixing box through a pipe. A No. 2 installation slot is opened in the center of the top of the workbench, and a sand spreader is commonly provided on the top of the two connecting rods. Two fixed arms are symmetrically fixedly installed on the left and right sides of the sand spreader, and a No. 1 top plate is commonly fixedly connected to the bottom of the two fixed arms, and a scraper is fixedly provided at the bottom of the No. 1 top plate.

[0008] Preferably, a through hole running through the front and back is opened at the lower part of the box body, and two No. 1 electric slide rails are symmetrically arranged at the bottom of the box body. The tops of the two No. 1 electric slide rails are slidably connected to a lifting sand box through a No. 1 electric slider. There are two lifting sand boxes, and the lifting sand box includes a bottom plate fixedly connected to the top of the No. 1 electric slider, and No. 1 hydraulic cylinders are fixedly installed at the four corners of the top of the bottom plate respectively. A sand box body is commonly arranged on the tops of the multiple No. 1 hydraulic cylinders, and a No. 2 hydraulic cylinder is fixedly installed at the center of the bottom surface of the sand box body, and a lifting plate is fixedly installed on the top of the output end of the No. 2 hydraulic cylinder, and the lifting plate is sealingly and slidably connected to the inside of the sand box body.

[0009] Preferably, the cleaning material collecting mechanism includes an air avoidance box fixedly mounted on the workbench, a collecting bucket is fixedly provided on the side of the bottom of the air avoidance box away from the workbench, the collecting bucket is connected to the inside of the air avoidance box, a driving assembly is provided on the side of the air avoidance box away from the workbench, and an automatic cleaning assembly is commonly provided between the driving assembly and the air avoidance box, and a No. 1 fixing rod is fixedly installed on the bottom of both the front and rear sides of the print head.

[0010] Preferably, the driving assembly includes two fixed frames that are symmetrically fixedly connected to the side of the air avoidance box away from the workbench, the two fixed frames are connected with a mounting shaft for common rotation, the middle part of the mounting shaft is fixedly sleeved with a No. 1 gear, the top of the two fixed frames is fixedly connected with a No. 2 top plate, the bottom center of the No. 2 top plate is fixedly installed with a No. 1 limit slider, the bottom of the No. 1 limit slider is slidably connected with a No. 1 limit slide rail, the bottom of the No. 1 limit slide rail is fixedly installed with a No. 2 rack meshing with the top of the No. 1 gear, a stopper is fixedly installed on the side of the No. 1 limit slide rail away from the air avoidance box, a movable plug plate slides through the middle part of the side of the air avoidance box away from the workbench, and a No. 1 rack meshing with the bottom of the No. 1 gear is fixedly installed on the side of the movable plug plate away from the workbench, and an automatic cleaning assembly is arranged on the other end of the movable plug plate.

[0011] Preferably, the automatic cleaning component includes a supporting plate fixedly connected to the other end of the movable plug plate, a cleaning scraper is fixedly provided on the top of the supporting plate, a No. 1 guide rod is slidably penetrated on both sides of the left and right sides of the supporting plate, the No. 1 guide rod is arranged inside the air avoidance box, a No. 1 spring is sleeved on the No. 1 guide rod, and the No. 1 spring is arranged between the supporting plate and the inner wall of the air avoidance box, two gantries are fixedly installed symmetrically on the left and right sides of the top of the air avoidance box away from the workbench, and a conical cleaning plate for cleaning the top of the cleaning scraper is fixedly installed on the top of the inner wall of the two gantries.

[0012] Preferably, a collection box is provided below the two sand leakage grooves, a blocking cover is fixedly installed on one side of the top of the two No. 1 installation grooves away from the center of the workbench, and support legs are fixedly installed at the four corners of the bottom of the workbench.

[0013] Preferably, the cleaning mechanism comprises two brush rollers rotatably connected to the inside of the No. 1 mounting groove for cleaning the bottom of the scraper, and the front ends of the two brush rollers are fixedly sleeved with a No. 2 gear.

[0014] Preferably, the front side wall inside the No. 1 installation groove is rotatably connected with a fixed shaft, and a No. 3 gear meshing with the two No. 2 gears is fixedly sleeved on the fixed shaft.

[0015] Preferably, a No. 2 limit slide rail is fixedly installed on the side where the two No. 2 electric slide rails are close to each other, and a No. 2 limit slider is slidably connected to the two No. 2 limit slide rails. The No. 2 limit slider is connected to the No. 2 electric slider on the No. 2 electric slide rail through a connecting arm, and a No. 3 rack meshing with the bottom of the No. 3 gear is fixedly installed on the connecting arm located on the front side.

[0016] The beneficial effects of the present invention are: 1. 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. After printing, the print head moves to the position of the cleaning and receiving mechanism for avoidance. The sand spreader then spreads sand in the reverse direction, and the print head prints in the reverse direction, realizing two-way sand spreading and two-way printing. There is no empty stroke for both the sand spreader and the print head, thereby improving printing efficiency.

[0017] 2. In the present invention, when the print head enters the area of ​​the cleaning and collecting mechanism for avoidance, the No. 1 fixed rod on the print head squeezes the driving assembly, driving the cleaning scraper in the automatic cleaning assembly to scrape and clean the glue and grit remaining on the bottom of the print head. After scraping and cleaning, as the print head leaves, the cleaning scraper is reset. During the resetting process, the conical cleaning plate scrapes and cleans the top of the cleaning scraper. Impurities on the conical cleaning plate fall into the collection bucket due to gravity, thereby achieving cleaning of the bottom of the print head and automatic cleaning of the cleaning scraper itself, and avoiding the situation where too many impurities remain on the cleaning scraper and the cleaning efficiency is reduced.

[0018] 3. When the sand spreader of the present invention is driven by the No. 2 electric slide rail to retreat from the working area to the left and right sides, the No. 3 rack is synchronously driven to retreat by the No. 2 electric slide rail, and the engagement of the No. 3 rack and the No. 3 gear indirectly drives the brush roller to rotate in the direction of the blocking cover, and the bottom of the scraper is cleaned by the rotation of the brush roller. At the same time, when the brush roller rotates, the impurities remaining on the brush roller are centrifugally thrown out, thereby avoiding the problem of reduced cleaning effect due to impurities accumulated on the brush roller, and the rotation of the brush roller generates air flow to further blow and clean the bottom of the scraper. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a stereogram of the overall structure of the present invention; Figure 2 It is a partial cross-sectional view of the overall structure of the present invention; Figure 3 It is a partial cross-sectional view of the lifting sand box of the present invention; Figure 4 It is a three-dimensional diagram of the mobile avoidance mechanism, the workbench, the cleaning material receiving mechanism and the cleaning mechanism of the present invention; Figure 5 It is a partial cross-sectional view of the cleaning material receiving mechanism of the present invention; Figure 6 The present invention Figure 5 A magnified schematic diagram of the middle A area; Figure 7 It is a partially cutaway stereoscopic view of the cleaning mechanism and the workbench of the present invention; Figure 8 The present invention Figure 7 A magnified schematic diagram of the middle B area; Fig. 9It is a partial sectional front view of the cleaning mechanism and the workbench of the present invention.

[0020] In the figure: 1, box body; 2, feeding hopper; 3, No. 1 electric slide rail; 4, lifting sand box; 41, bottom plate; 42, sand box body; 43, No. 1 hydraulic cylinder; 44, lifting plate; 45, No. 2 hydraulic cylinder; 5, cleaning and collecting mechanism; 51, driving assembly; 511, No. 1 rack; 512, mounting shaft; 513, No. 1 gear; 514, fixing frame; 515, No. 1 limit slide rail; 516, No. 2 rack; 517, No. 2 top plate; 518, No. 1 limit slider; 519, movable plug plate; 52, collecting bucket; 53, automatic cleaning assembly; 531, No. 1 spring; 532, No. 1 guide rod; 533, gantry; 534, cleaning scraper; 535, supporting plate; 536, conical cleaning plate; 54, No. 1 fixed rod; 55, avoidance box; 6, mobile avoidance mechanism; 61, side plate; 62, No. 2 guide rod; 63, lead screw; 64, movable block; 65, limit plate; 66, No. 3 electric slide rail; 67, servo motor; 7, cleaning mechanism; 71, brush roller; 72, No. 2 gear; 73, No. 3 gear; 74, No. 3 rack; 75, No. 2 limit slide rail; 76, fixed shaft; 77, No. 2 limit slider; 78, connecting arm; 8, blocking cover; 9, limit slot; 10, No. 2 electric slide rail; 11, No. 1 installation slot; 12, sand spreader; 13, workbench; 14, No. 2 installation slot; 15, print head; 16, fixed arm; 17, scraper; 18, No. 1 top plate; 19, connecting rod; 20, sand leakage slot. DETAILED DESCRIPTION

[0021] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0022] Example: See Figure 1 , Figure 2 and Figure 4A sand mold 3D printer comprises a box body 1, a workbench 13 is arranged inside the box body 1, a moving avoidance mechanism 6 is arranged on the top of the box body 1, a cleaning material receiving mechanism 5 for cleaning a print head 15 is arranged on both the front and rear sides of the workbench 13, and the two cleaning material receiving mechanisms 5 are symmetrically distributed around the center of the workbench 13, two limit grooves 9 are symmetrically arranged on the workbench 13, and a No. 2 electric slide rail 10 is fixedly arranged at the bottom of the workbench 13 below the limit groove 9, and the two No. 2 electric slide rails 10 are both slidably installed with a connecting rod 19 through a No. 2 electric slider, and a sand spreader 12 is commonly arranged on the top of the two connecting rods 19, and two fixed arms 16 are symmetrically fixedly installed on the left and right sides of the sand spreader 12, and a No. 1 fixed arm 16 is commonly fixedly installed at the bottom of the two fixed arms 16 A top plate 18, a scraper 17 is fixedly arranged at the bottom of the No. 1 top plate 18, an adjusting screw (not shown in the figure) is installed on the No. 1 top plate 18, so as to adjust the position of the scraper 17 according to the usage situation, two No. 1 mounting grooves 11 and two sand leakage grooves 20 are symmetrically arranged on the top of the workbench 13, a cleaning mechanism 7 is arranged inside the No. 1 mounting groove 11 and on the No. 2 electric slide rail 10, a feeding hopper 2 is arranged on the right side of the top of the box body 1, and the feeding hopper 2 is connected to the sand mixing box (not shown in the figure) through a pipeline, a No. 2 mounting groove 14 is arranged at the center of the top of the workbench 13, a collecting box is arranged below the two sand leakage grooves 20, a blocking cover 8 is fixedly installed on the side of the top of the two No. 1 mounting grooves 11 away from the center of the workbench 13, and supporting legs are fixedly installed at the four corners of the bottom of the workbench 13.

[0023] During use of the present invention, the sand mixing box and the feeding hopper 2 are used to transport the mixed gravel to the sand spreader 12, the sand spreader 12 is used to evenly spread the gravel on the printing area, the sand spreader 12 can spread sand in both directions, and can be scraped flat in both directions, the scraper 17 is used to scrape the laid gravel flat, the cleaning mechanism 7 is used to brush and clean the bottom of the scraper 17, and the cleaning and receiving mechanism 5 is used to clean the print head 15 and automatically collect impurities.

[0024] See also Figure 2 , Figure 3 and Figure 4 A through hole running through the front and back is opened at the lower part of the box body 1, and two No. 1 electric slide rails 3 are symmetrically arranged at the bottom of the box body 1. The tops of the two No. 1 electric slide rails 3 are slidably connected with a lifting sand box 4 through a No. 1 electric slider. There are two lifting sand boxes 4, and they are all slidably connected to the No. 1 electric slide rail 3. The lifting sand box 4 includes a bottom plate 41 fixedly connected to the top of the No. 1 electric slider, and No. 1 hydraulic cylinders 43 are fixedly installed at the four corners of the top of the bottom plate 41. A sand box body 42 is commonly arranged on the top of the multiple No. 1 hydraulic cylinders 43, and a No. 2 hydraulic cylinder 45 is fixedly installed at the center of the bottom surface of the sand box body 42, and a lifting plate 44 is fixedly installed on the top of the output end of the No. 2 hydraulic cylinder 45, and the lifting plate 44 is sealed and slidably connected to the inside of the sand box body 42.

[0025] When in use, start the No. 1 electric slide 3, which is transported to the bottom of the No. 2 installation slot 14 through the No. 1 electric slider. At this time, start the No. 1 hydraulic cylinder 43, and the output end of the No. 1 hydraulic cylinder 43 extends, driving the sand box body 42 and the No. 2 hydraulic cylinder 45 thereon to move upward until the upper edge of the sand box body 42 is flush with the top of the No. 2 installation slot 14. At this time, start the No. 2 hydraulic cylinder 45, and the output end of the No. 2 hydraulic cylinder 45 extends, driving the lifting plate 44 to move upward. The distance between the lifting plate 44 and the top edge of the sand box body 42 is the thickness of the gravel to be laid. Each time the gravel is laid, the No. 2 hydraulic cylinder 45 is started, and the output end of the No. 2 hydraulic cylinder 45 is extended, driving the lifting plate 44 to move upward. The output end of the hydraulic cylinder 45 drops a distance, and the dropped distance is the thickness of the laid gravel. The mobile avoidance mechanism 6 and the No. 2 electric slide rail 10 are vertically distributed at ninety degrees. The sand spreader 12 is moved by the No. 2 electric slide rail 10, and the print head 15 is driven by the mobile avoidance mechanism 6. The front and rear ends of the mobile avoidance mechanism 6 are avoidance positions, that is, when the print head 15 moves to the avoidance position, the sand spreader 12 can slide smoothly along the No. 2 electric slide rail 10, and there will be no interference between the print head 15 and the sand spreader 12, so that the print head 15 and the sand spreader 12 have no empty stroke, thereby improving the printing efficiency.

[0026] See also Figure 2 and Figure 4 The movable avoidance mechanism 6 includes two side panels 61 which are symmetrically fixedly connected to both sides of the top of the box body 1, and a screw rod 63 is connected to the two side panels 61 for common rotation. A servo motor 67 is fixedly installed on the side panel 61 on the right side, and the output end of the servo motor 67 is fixedly connected to the right end of the screw rod 63. A movable block 64 is threadedly connected to the screw rod 63 through a ball nut, and a No. 3 electric slide rail 66 is fixedly installed at the bottom of the movable block 64. The bottom of the No. 3 electric slide rail 66 is slidably connected to the print head 15 through the No. 3 electric slider, and the front end and the rear end of the No. 3 electric slide rail 66 are the avoidance positions of the print head 15 to the sand spreader 12. A limit plate 65 is fixedly installed on the top of the movable block 64, and a No. 2 guide rod 62 is slidably penetrated through the middle of the limit plate 65, and the No. 2 guide rod 62 is arranged between the two side panels 61.

[0027] When in use, first start the servo motor 67, and the output end of the servo motor 67 drives the lead screw 63 to rotate, and synchronously drives the movable block 64 and the No. 3 electric slide rail 66 thereon to slide left and right along the direction of the No. 2 guide rod 62, and at the same time, the No. 3 electric slide rail 66 and the No. 3 electric slider thereon drive the print head 15 to slide back and forth, and the coordinated use of the two realizes the movement of the print head 15. Before laying sand, the mobile avoidance mechanism 6 moves the print head 15 to the top of the cleaning and receiving mechanism 5 located on the front side, so that the print head 15 avoids the sand spreader 12. At this time, the No. 2 electric slide rail 10 drives the sand spreader 12 to move from right to left. Fine sand is stored in the sand spreader 12. When the sand spreader 12 moves to the right side of the top of the lifting plate 44, it starts to spread sand, and when it moves to the left side of the lifting plate 44, it stops spreading sand, so that the fine sand required for printing is evenly spread on the top of the lifting plate 44, and the scraper 17 scrapes the gravel flat while laying. When spreading sand from right to left, the scraper 17 on the right is used for leveling. When leveling from right to left, the excess fine sand is scraped into the sand leakage groove 20, and falls into the collection box through the sand leakage groove 20 for collection, thereby reducing the amount of fine sand entering the cleaning mechanism 7. At this time, the mobile avoidance mechanism 6 is used to drive the print head 15 to move continuously back and forth, and the curing agent is applied to the designated area of ​​the gravel according to the designed shape. After one layer of printing is completed, the mobile avoidance mechanism 6 moves the print head 15 to the top of the cleaning material receiving mechanism 5 on the rear side for avoidance. At this time, the sand spreader 12 spreads sand from left to back, and then the print head 15 prints continuously from back to front. By applying glue and sand layer by layer according to the designed shape, printing is completed, realizing two-way sand spreading and two-way printing. There is no empty stroke for the print head 15 and the sand spreader 12, thereby improving printing efficiency. After the sand spreader 12 reciprocates for a cycle, it returns to the right side, and the sand spreader 12 is fed with sand by the feeding hopper 2.

[0028] See also Figure 4 and Figure 5 The cleaning material collecting mechanism 5 includes an air avoidance box 55 fixedly mounted on the workbench 13, a collecting bucket 52 is fixedly provided on the side of the bottom of the air avoidance box 55 away from the workbench 13, the collecting bucket 52 is connected to the inside of the air avoidance box 55, a driving component 51 is provided on the side of the air avoidance box 55 away from the workbench 13, and an automatic cleaning component 53 is provided between the driving component 51 and the air avoidance box 55, and a No. 1 fixing rod 54 is fixedly installed on the bottom of the front and rear sides of the print head 15.

[0029] See also Figure 4 and Figure 5The driving assembly 51 includes two fixed frames 514 symmetrically fixedly connected to the side of the air avoidance box 55 away from the workbench 13, and the two fixed frames 514 are connected to a mounting shaft 512 for common rotation. A No. 1 gear 513 is fixedly sleeved on the middle of the mounting shaft 512. A No. 2 top plate 517 is fixedly connected to the top of the two fixed frames 514. A No. 1 limit slider 518 is fixedly installed at the bottom center of the No. 2 top plate 517. The bottom of the No. 1 limit slider 518 is slidably connected to a No. 1 limit rail 515, a No. 2 rack 516 meshing with the top of the No. 1 gear 513 is fixedly installed at the bottom of the No. 1 limiting slide rail 515, a stopper is fixedly installed on the side of the No. 1 limiting slide rail 515 away from the air avoidance box 55, a movable plug plate 519 slides through the middle of the side of the air avoidance box 55 away from the workbench 13, a No. 1 rack 511 meshing with the bottom of the No. 1 gear 513 is fixedly installed on the side of the movable plug plate 519 away from the workbench 13, and an automatic cleaning component 53 is arranged on the other end of the movable plug plate 519.

[0030] See also Figure 4 , Figure 5 and Figure 6 The automatic cleaning component 53 includes a supporting plate 535 fixedly connected to the other end of the movable plug plate 519, a cleaning scraper 534 is fixedly arranged on the top of the supporting plate 535, and a No. 1 guide rod 532 is slidably penetrated on both sides of the supporting plate 535, and the No. 1 guide rod 532 is arranged inside the air avoidance box 55. A No. 1 spring 531 is sleeved on the No. 1 guide rod 532, and the No. 1 spring 531 is arranged between the supporting plate 535 and the inner wall of the air avoidance box 55. Two gantries 533 are fixedly installed symmetrically on the left and right sides of the top of the air avoidance box 55 away from the workbench 13, and a conical cleaning plate 536 for cleaning the top of the cleaning scraper 534 is fixedly installed on the top of the inner wall of the two gantries 533.

[0031] When in use, when the mobile avoidance mechanism 6 drives the print head 15 to move to the avoidance position, the No. 1 fixed rod 54 on the print head 15 squeezes the No. 2 rack 516, driving the No. 2 rack 516 to move away from the workbench 13, indirectly driving the No. 1 rack 511 and the movable plug plate 519 thereon to move toward the workbench 13, and at the same time driving the supporting plate 535 and the cleaning scraper 534 thereon to move toward the workbench 13, synchronously compressing the No. 1 spring 531, and using the cleaning scraper 534 to clean and scrape off debris such as gravel and glue at the bottom of the print head 15, thereby realizing automatic cleaning of the print head 15 without manual participation, saving time and effort, and being easy to use. After the print head 15 leaves, the restoring force of spring No. 1 531 drives the support plate 535 and the cleaning scraper 534 thereon to retreat in the direction away from the workbench 13. During the retreat, the cleaning scraper 534 passes through the bottom of the conical cleaning plate 536, and the conical cleaning plate 536 is used to clean the top of the cleaning scraper 534, and the impurities remaining on the cleaning scraper 534 are removed to prevent affecting the next cleaning. The impurities on the conical cleaning plate 536 fall into the collecting bucket 52 under the squeezing of the cleaning scraper 534 and its own gravity, thereby realizing the automatic cleaning of the print head 15 and the self-cleaning of the cleaning scraper 534.

[0032] See also Figure 4 , Figure 7 , Figure 8 and Fig. 9 The cleaning mechanism 7 includes two brush rollers 71 rotatably connected to the inside of the No. 1 mounting groove 11 for cleaning the bottom of the scraper 17. The front ends of the two brush rollers 71 are fixedly sleeved with a No. 2 gear 72. The front side wall inside the No. 1 mounting groove 11 is rotatably connected to a fixed shaft 76, and the fixed shaft 76 is fixedly sleeved with a No. 3 gear 73 that meshes with the two No. 2 gears 72.

[0033] See also Figure 2 , Figure 7 , Figure 8 and Fig. 9 A No. 2 limit rail 75 is fixedly installed on the side where the two No. 2 electric slide rails 10 are close to each other, and a No. 2 limit slider 77 is slidably connected to the two No. 2 limit rails 75. The No. 2 limit slider 77 is connected to the No. 2 electric slider on the No. 2 electric slide rail 10 through a connecting arm 78. A No. 3 rack 74 meshing with the bottom of the No. 3 gear 73 is fixedly installed on the connecting arm 78 located on the front side.

[0034] When in use, when the No. 2 electric slide rail 10 drives the sand spreader 12 to spread sand along the limiting groove 9 from right to left or from left to right, it synchronously drives the fixed arm 16 and the No. 1 top plate 18 thereon to slide, and at the same time drives the scraper 17 to scrape the fine sand flat. As the No. 2 electric slide rail 10 drives the No. 2 electric slider and the connecting arm 78 thereon to continue to move, it also drives the No. 2 limiting slider 77 and the No. 3 rack 74 thereon to move, and then drives the No. 3 gear 73 to rotate. The number of teeth of the No. 3 gear 73 and the No. 2 gear 72 is The ratio is six to one, which drives the second gear 72 and the brush roller 71 thereon to rotate at a high speed. As the brush roller 71 rotates, the bottom of the scraper 17 is brushed and cleaned. During rotation cleaning, the residual gravel on the brush roller 71 is thrown out by centrifugal force, and the blocking cover 8 blocks the thrown-out gravel, thereby reducing the residue on the brush roller 71 and avoiding the influence of the fine sand remaining in the brush roller 71 on the cleaning effect of the scraper 17. The wind force generated by the rotation of the brush roller 71 realizes further cleaning of the bottom of the scraper 17.

[0035] It should be noted that when the sand mold 3D printer is used, the No. 1 electric slide 3 is first started, and the No. 1 electric slide 3 transports the lifting sand box 4 to the bottom of the No. 2 installation slot 14 through the No. 1 electric slider. At this time, the No. 1 hydraulic cylinder 43 is started, and the output end of the No. 1 hydraulic cylinder 43 is extended, driving the sand box body 42 and the No. 2 hydraulic cylinder 45 thereon to move upward until the upper edge of the sand box body 42 is flush with the top of the No. 2 installation slot 14. At this time, the No. 2 hydraulic cylinder 45 is started, and the output end of the No. 2 hydraulic cylinder 45 is extended. , driving the lifting plate 44 to move upward, the distance between the lifting plate 44 and the top edge of the sand box body 42 is the thickness of the laid gravel. Before laying the sand, the mobile avoidance mechanism 6 moves the print head 15 to the top of the cleaning and receiving mechanism 5 located on the front side. At this time, the second electric slide rail 10 drives the sand spreader 12 to move from right to left until the gravel is evenly laid on the top of the lifting plate 44. While laying, the scraper 17 scrapes the gravel flat. At this time, the mobile avoidance mechanism 6 is used to drive the print head 15 to move back and forth continuously. The curing agent is applied to the designated area of ​​the gravel. After one layer of printing is completed, the mobile avoidance mechanism 6 moves the print head 15 to the top of the cleaning and collecting mechanism 5 on the rear side to avoid it. At this time, the sand spreader 12 spreads sand from left to back, and then the print head 15 prints continuously from back to front, realizing two-way sand spreading and two-way printing. Both the print head 15 and the sand spreader 12 have no empty stroke, which improves the printing efficiency. After printing is completed, the No. 1 electric slide rail 3 is used to move the printed lifting sand box 4 out of the working area, and the new lifting sand box 4 is moved to the working area, realizing the alternating operation of the double lifting sand boxes 4, with high working efficiency. When the print head 15 avoids, the cleaning and collecting mechanism 5 is used to automatically clean the print head 15 and automatically collect impurities, without manual participation, saving time and effort. When the sand spreader 12 spreads sand, the cleaning mechanism 7 is used to brush and clean the bottom of the scraper 17, and the cleaning mechanism 7 is linked with the No. 2 electric slide rail 10. The rotating cleaning action of the cleaning mechanism 7 does not require an additional driving source, and the rotating centrifugal force realizes the self-cleaning of the cleaning mechanism 7 itself.

[0036] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A sand mold 3D printer, comprising a housing (1), characterized in that: A workbench (13) is arranged inside the box body (1), a moving avoidance mechanism (6) is arranged on the top of the box body (1), cleaning and collecting mechanisms (5) are arranged on both the front and rear sides of the workbench (13), two limit grooves (9) are symmetrically arranged on the front and rear sides of the workbench (13), and a No. 2 electric slide rail (10) is fixedly arranged at the bottom of the workbench (13) below the limit groove (9), and the two No. 2 electric slide rails (10) are both slidably installed with a connecting rod (19) through a No. 2 electric slider, and two No. 1 installation grooves (11) and two sand leakage grooves (20) are symmetrically arranged on the top of the workbench (13), and a cleaning mechanism (7) is arranged inside the No. 1 installation groove (11) and on the No. 2 electric slide rail (10); The movable avoidance mechanism (6) comprises two side plates (61) fixedly connected to both sides of the top of the box body (1) symmetrically on the left and right, a screw rod (63) being rotatably connected between the two side plates (61), a servo motor (67) being fixedly mounted on the side plate (61) on the right, an output end of the servo motor (67) being fixedly connected to the right end of the screw rod (63), a movable block (64) being threadedly connected to the screw rod (63) via a ball nut, a No. 3 electric slide rail (66) being fixedly mounted on the bottom of the movable block (64), a No. 3 electric slide rail (66) being slidably connected to a print head (15) at the bottom of the No. 3 electric slide rail (66) via a No. 3 electric slider, and the front end and the rear end of the No. 3 electric slide rail (66) being the avoidance position of the print head (15) with respect to the sanding device (12), a limit plate (65) being fixedly mounted on the top of the movable block (64), a No. 2 guide rod (62) being slidably penetrated through the middle of the limit plate (65), and the No. 2 guide rod (62) being arranged between the two side plates (61).

2. A sand mold 3D printer according to claim 1, characterized in that: A feeding hopper (2) is arranged on the right side of the top of the box body (1), and the feeding hopper (2) is connected to the sand mixing box through a pipeline. A second installation groove (14) is opened at the center of the top of the workbench (13), and a sand spreader (12) is arranged on the top of two connecting rods (19). Two fixed arms (16) are fixedly installed on the left and right sides of the sand spreader (12) in a front-to-back symmetrical manner. The bottoms of the two fixed arms (16) are fixedly connected to a first top plate (18), and a scraper (17) is fixedly arranged on the bottom of the first top plate (18).

3. A sand mold 3D printer according to claim 1, characterized in that: The lower part of the box body (1) is provided with a through hole that penetrates front and back, and two No. 1 electric slide rails (3) are symmetrically arranged below the box body (1). The tops of the two No. 1 electric slide rails (3) are slidably connected to a lifting sand box (4) through a No. 1 electric slider. There are two lifting sand boxes (4). The lifting sand boxes (4) include a bottom plate (41) fixedly connected to the top of the No. 1 electric slider, and No. 1 hydraulic cylinders (43) are fixedly installed at the four corners of the top of the bottom plate (41). A sand box body (42) is commonly arranged on the tops of the plurality of No. 1 hydraulic cylinders (43). A No. 2 hydraulic cylinder (45) is fixedly installed at the center of the bottom surface of the sand box body (42). A lifting plate (44) is fixedly installed at the top of the output end of the No. 2 hydraulic cylinder (45), and the lifting plate (44) is sealed and slidably connected to the inside of the sand box body (42).

4. A sand mold 3D printer according to claim 1, characterized in that: The cleaning material collecting mechanism (5) comprises an air avoidance box (55) fixedly mounted on the workbench (13); a collecting hopper (52) is fixedly mounted on a side of the bottom of the air avoidance box (55) away from the workbench (13); the collecting hopper (52) is communicated with the interior of the air avoidance box (55); a driving assembly (51) is arranged on a side of the air avoidance box (55) away from the workbench (13); an automatic cleaning assembly (53) is arranged between the driving assembly (51) and the air avoidance box (55); and a No. 1 fixing rod (54) is fixedly mounted on the bottom of both the front and rear sides of the print head (15).

5. A sand mold 3D printer according to claim 4, characterized in that: The driving assembly (51) comprises two fixed frames (514) symmetrically fixedly connected to the side of the air avoidance box (55) away from the workbench (13), a mounting shaft (512) being rotatably connected between the two fixed frames (514), a first gear (513) being fixedly sleeved in the middle of the mounting shaft (512), a second top plate (517) being fixedly connected to the tops of the two fixed frames (514), a first limiting slide block (518) being fixedly installed at the bottom center of the second top plate (517), and a first limiting slide rail (518) being slidably connected to the bottom of the first limiting slide block (518). 15), a second rack (516) meshing with the top of the first gear (513) is fixedly installed at the bottom of the first limiting slide rail (515), a stopper is fixedly installed on the side of the first limiting slide rail (515) away from the air avoidance box (55), a movable plug plate (519) slides through the middle of the side of the air avoidance box (55) away from the workbench (13), a first rack (511) meshing with the bottom of the first gear (513) is fixedly installed on the side of the movable plug plate (519) away from the workbench (13), and an automatic cleaning component (53) is arranged at the other end of the movable plug plate (519).

6. A sand mold 3D printer according to claim 5, characterized in that: The automatic cleaning component (53) comprises a supporting plate (535) fixedly connected to the other end of the movable plug plate (519), a cleaning scraper (534) being fixedly arranged on the top of the supporting plate (535), a No. 1 guide rod (532) slidingly passing through the left and right sides of the supporting plate (535), the No. 1 guide rod (532) being arranged inside the air avoidance box (55), a No. 1 spring (531) being sleeved on the No. 1 guide rod (532), the No. 1 spring (531) being arranged between the supporting plate (535) and the inner wall of the air avoidance box (55), two gantries (533) being fixedly arranged symmetrically on the left and right sides of the top of the air avoidance box (55) away from the workbench (13), and a conical cleaning plate (536) for cleaning the top of the cleaning scraper (534) being fixedly arranged on the top of the inner wall of the two gantries (533).

7. A sand mold 3D printer according to claim 1, characterized in that: A collection box is provided below the two sand leakage grooves (20), a blocking cover (8) is fixedly installed on one side of the top of the two No. 1 installation grooves (11) away from the center of the workbench (13), and supporting legs are fixedly installed at the four corners of the bottom of the workbench (13).

8. A sand mold 3D printer according to claim 1, characterized in that: The cleaning mechanism (7) comprises two brush rollers (71) rotatably connected to the inside of the first mounting groove (11) and used to clean the bottom of the scraper (17), and the front ends of the two brush rollers (71) are fixedly sleeved with a second gear (72).

9. A sand mold 3D printer according to claim 8, characterized in that: A fixed shaft (76) is rotatably connected to the front side wall of the first installation groove (11), and a third gear (73) meshing with the two second gears (72) is fixedly sleeved on the fixed shaft (76).

10. A sand mold 3D printer according to claim 8, characterized in that: A No. 2 limit slide rail (75) is fixedly installed on the side where the two No. 2 electric slide rails (10) are close to each other, and a No. 2 limit slider (77) is slidably connected to the two No. 2 limit slide rails (75). The No. 2 limit slider (77) is connected to the No. 2 electric slider on the No. 2 electric slide rail (10) through a connecting arm (78), and a No. 3 rack (74) meshing with the bottom of the No. 3 gear (73) is fixedly installed on the connecting arm (78) located on the front side.

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