A water glass sand mold three-dimensional printing device and method

Abstract

The present invention proposes a water glass sand mold three-dimensional printing device and method, wherein the water glass sand mold three-dimensional printing device includes a frame, a forming component, a sand-laying component, a spraying component and an inflation device, the sand-laying component spreads a mixture on the bottom of the cylinder body to form a sand bed for sand mold printing, the spraying component sprays a water-soluble catalyst to the sand bed in the cylinder body, the cover plate is covered on the cylinder body to form a sealed chamber, the inflation device quickly fills the sealed chamber with carbon dioxide gas to replace the air before vacuuming, thereby realizing the rapid hardening of the water glass sand mold, the sand mold printing and carbon dioxide blowing are both carried out in the cylinder body, there is no need to change the work station, and the printing efficiency and accuracy of the sand mold can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of three-dimensional printing equipment, and in particular to a water glass sand mold three-dimensional printing device and method. Background Art

[0002] The manufacture of casting sand molds through 3D printing technology is a novel casting modeling technology. This technology can simplify the forming process of casting sand molds, improve the forming freedom of casting sand molds, and has a very broad application prospect. Sodium silicate water glass (hereinafter referred to as water glass) is an inorganic green chemical binder with low cost, easy to manufacture, harmless to the human body, and widely used in the manufacture of casting sand molds. When using water glass for 3D printing, the printed sand mold needs to be cured. The existing curing methods include ester curing, microwave curing, thermal curing, etc., but these methods have low curing efficiency, which is not conducive to the formation of sand molds.

[0003] In response to the above problems, a Chinese patent with prior art publication number CN107790628A discloses a method and device for forming a 3D printed casting sand mold using an air blowing curing method. The sand mold is printed using water glass and then carbon dioxide is blown into it for curing to improve the curing efficiency and the forming efficiency. However, in this scheme, the sand mold is printed at a first station, and the printed sand mold is moved to a second station for air blowing curing. The operations of changing stations for curing and compacting the sand mold are likely to cause the dimensional accuracy of the sand mold to deteriorate. Summary of the invention

[0004] In view of this, the present invention proposes a water glass sand mold three-dimensional printing device and method, which solves the problem of poor dimensional accuracy caused by changing work stations by performing sand mold printing and air blowing curing in a cylinder.

[0005] The technical solution of the present invention is achieved in this way:

[0006] In a first aspect, the present invention provides a water glass sand mold three-dimensional printing device, comprising a frame, a forming component, a sand laying component, a spraying component and an inflation device, wherein:

[0007] The forming assembly comprises a cylinder body, a cover plate and a forming bottom plate. The cylinder body is fixed on the frame and has an opening on the top. The cover plate is rotatably connected to the frame and can cover the cylinder body to form a sealed chamber. The forming bottom plate is arranged in the cylinder body and can move in the vertical direction.

[0008] The sand-laying assembly is slidably mounted on the frame and disposed above the cylinder body, and is used to lay mixed material on the forming bottom plate to form a sand bed;

[0009] The injection assembly is slidably mounted on the frame and disposed above the cylinder body, and is used to inject a water-soluble catalyst onto the sand bed in the cylinder body;

[0010] The inflation device is in communication with the sealed chamber and is used for filling carbon dioxide into the sealed chamber.

[0011] On the basis of the above technical solution, preferably, the water glass sand mold 3D printing device also includes a control device, which is electrically connected to the sand laying component, the injection component, the forming component and the inflation device, and is used to control the sand laying component, the injection component, the forming component and the inflation device to operate according to preset rules.

[0012] On the basis of the above technical solution, preferably, the inflation device is connected to the cover plate, and is used to fill carbon dioxide into the sealed chamber through the cover plate.

[0013] On the basis of the above technical solution, preferably, the water glass sand mold three-dimensional printing device also includes a vacuum pumping device, and the vacuum pumping device is connected to the bottom of the cylinder body.

[0014] On the basis of the above technical solution, preferably, two guide rails are provided on the frame, and the two guide rails are arranged in parallel on both sides of the cylinder body; the sand laying assembly includes a sand bucket and two first sliding blocks, and the two first sliding blocks are respectively arranged under the sand bucket, and the first sliding blocks are slidably connected to the guide rails.

[0015] On the basis of the above technical solution, preferably, the injection assembly includes a liquid tank, a plurality of nozzles and two second sliders, the nozzles are arranged on the liquid tank, the two second sliders are respectively connected to the bottom of the liquid tank, and the second slider is slidably connected to the guide rail.

[0016] On the basis of the above technical solution, preferably, the injection assembly further includes a heating device, and the heating device is installed on the two second sliding blocks.

[0017] On the basis of the above technical solution, preferably, the water glass sand mold 3D printing device also includes a first driving device and a first transmission mechanism, the first driving device is arranged on the frame, and the first transmission mechanism is respectively connected to the first driving device, the first slider and the second slider, for driving the first slider and the second slider to move synchronously along the guide rail.

[0018] On the basis of the above technical scheme, preferably, the first transmission mechanism includes a first transmission rod, a second transmission rod, four first synchronous wheels, four second synchronous wheels, two first synchronous belts and two second synchronous belts, the first transmission rod is transmission-connected to the first driving device, the first transmission rod and the second transmission rod are rotatably mounted on the frame and arranged in parallel; two of the first synchronous wheels and two of the second synchronous wheels are arranged on the first transmission rod, and the remaining two of the first synchronous wheels and two of the second synchronous wheels are arranged on the second transmission rod; the first synchronous belt is drivingly connected to the two first synchronous wheels, and the two first synchronous wheels are respectively connected to the two first sliders, and the second synchronous belt is drivingly connected to the two second synchronous wheels, and the two second synchronous wheels are respectively connected to the two second sliders.

[0019] On the basis of the above technical solution, preferably, the first transmission mechanism also includes a third synchronous wheel, a fourth synchronous wheel and a third synchronous belt, the third synchronous wheel is connected to the first driving device, the fourth synchronous wheel is arranged on the first transmission rod, and the third synchronous belt is driven and connected to the third synchronous wheel and the fourth synchronous wheel.

[0020] On the basis of the above technical solution, preferably, the forming assembly also includes a rotating shaft and two shaft seats, the two shaft seats are connected to the frame, the rotating shaft is rotatably installed on the shaft seats, and the cover plate is connected to the rotating shaft.

[0021] On the basis of the above technical solution, preferably, the forming assembly further includes a first electric telescopic rod, and the first electric telescopic rod is respectively connected to the cover plate and the frame.

[0022] On the basis of the above technical solution, preferably, the forming assembly also includes a second electric telescopic rod and a mounting plate, the mounting plate is rotatably mounted on the frame, the first electric telescopic rod and two axle seats are fixed on the mounting plate, and the second electric telescopic rod is respectively connected to the frame and the mounting plate.

[0023] On the basis of the above technical solution, preferably, the forming assembly also includes a limit block and a stop block, the limit block is arranged on the mounting plate, the stop block is arranged on the frame, and when the limit block abuts against the stop block, the cover plate is coaxial with the center line of the cylinder body.

[0024] On the basis of the above technical solution, preferably, the forming assembly also includes a second driving device and a second transmission mechanism, the second driving device is installed on the frame, and the second transmission mechanism is respectively connected to the second driving device and the forming base plate.

[0025] On the basis of the above technical solution, preferably, the second transmission mechanism includes a screw rod and a guide rod, the screw rod is respectively connected to the second driving device and the forming base plate, the guide rod is parallel to the depth direction of the cylinder body, and the guide rod is guided and connected to the forming base plate.

[0026] In a second aspect, the present invention proposes a water glass sand mold 3D printing method, which is applied to the water glass sand mold 3D printing device, comprising:

[0027] The control device controls the sand-laying assembly to move to above the cylinder opening, and lays a mixture on the forming bottom plate to form a sand bed, wherein the mixture includes raw sand and solid water glass powder;

[0028] The sand-laying assembly is controlled to move away by a control device, and the spray assembly is controlled to move above the cylinder opening to spray a water-soluble catalyst onto the sand bed in the cylinder;

[0029] The cover plate is controlled by a control device to cover the cylinder body and form a sealed chamber;

[0030] The control device controls the inflation device to fill the sealed chamber with carbon dioxide.

[0031] The water glass sand mold 3D printing device of the present invention has the following beneficial effects compared with the prior art:

[0032] (1) The sand-laying component lays the mixed material on the bottom of the cylinder to form a sand bed for sand mold printing, the injection component sprays a water-soluble catalyst on the sand bed in the cylinder, the cover plate is covered on the cylinder to form a sealed chamber, the inflation device quickly fills the sealed chamber with carbon dioxide gas to replace the air before vacuuming, thereby realizing the rapid hardening of the water glass sand mold, the sand mold printing and carbon dioxide blowing are both carried out in the cylinder, without changing the work station, which can improve the efficiency and accuracy of sand mold printing;

[0033] (2) A vacuum device is provided to be connected to the bottom of the cylinder body, and vacuum is performed below the cylinder body to exhaust the air in the capillary system of the sand mold to the maximum extent, allowing CO2 gas to enter the capillary system, so that the sand mold hardens quickly under the action of high concentration of CO2 gas, thereby improving the hardness and permeability of the sand mold;

[0034] (3) a heating device is provided in the injection assembly, the heating device heats the sand bed to increase the curing speed of the sand mold;

[0035] (4) By setting up a first transmission mechanism, the first slider and the second slider are driven to move synchronously along the guide rail, so that the injection assembly can move toward the cylinder body during the process of resetting the sand-laying assembly after the mixed material is laid, thereby saving time between the two processes and improving printing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a three-dimensional diagram of the water glass sand mold three-dimensional printing device of the present invention;

[0038] Figure 2 A three-dimensional diagram of the forming assembly and the frame of the present invention;

[0039] Figure 3 It is a three-dimensional diagram of the cylinder connection structure of the present invention;

[0040] Figure 4 A three-dimensional diagram of the cover plate connection structure of the present invention;

[0041] Figure 5 is a three-dimensional diagram of a first transmission mechanism of the present invention;

[0042] Figure 6 is a three-dimensional diagram of the first transmission rod connection structure of the present invention;

[0043] Figure 7 It is a schematic diagram of the process of the water glass sand mold three-dimensional printing method of the present invention.

[0044] In the above drawings, 1-frame, 11-guide rail; 2-forming assembly, 21-cylinder body, 22-cover plate, 23-forming bottom plate, 24-rotating shaft, 25-axle seat, 26-first electric telescopic rod, 27-second electric telescopic rod, 28-mounting plate, 29-limiting block, 210-block, 211-second driving device, 212-second transmission mechanism, 2121-screw rod, 2122-guide rod; 3-sand laying assembly, 31-first slide Block, 32-sand bucket; 4-injection assembly, 41-second slider, 42-liquid tank, 43-heating device; 5-inflating device; 6-control device; 7-first driving device; 8-first transmission mechanism, 81-first transmission rod, 82-second transmission rod, 83-first synchronous wheel, 84-second synchronous wheel, 85-first synchronous belt, 86-second synchronous belt, 87-third synchronous wheel, 88-fourth synchronous wheel, 89-third synchronous belt. DETAILED DESCRIPTION

[0045] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Reference Figure 1-6 As shown, the embodiment of the present invention provides a water glass sand mold three-dimensional printing device, including a frame 1, a forming component 2, a sand laying component 3, a spraying component 4 and an inflation device 5, wherein:

[0047] The forming assembly 2 includes a cylinder body 21, a cover plate 22 and a forming bottom plate 23. The cylinder body 21 is fixed on the frame 1 and is provided with an opening on the top. The cover plate 22 is rotatably connected to the frame 1 and can cover the cylinder body 21 to form a sealed chamber. The forming bottom plate 23 is provided in the cylinder body 21 and can move in the vertical direction.

[0048] The sand-laying assembly 3 is slidably mounted on the frame 1 and is disposed above the cylinder body 21, and is used to lay a mixture on the forming bottom plate 23 to form a sand bed, wherein the mixture includes raw sand and solid water glass powder;

[0049] The spray assembly 4 is slidably mounted on the frame 1 and disposed above the cylinder 21, and is used to spray a water-soluble catalyst onto the sand bed in the cylinder 21;

[0050] The inflation device 5 is in communication with the sealed chamber and is used to inflate carbon dioxide into the sealed chamber.

[0051] In this embodiment, the water-soluble catalyst refers to a liquid formed by the catalyst dissolving in water, in which the solid water glass powder can be dissolved. After repeating the specified number of layers of the mixture and the water glass spraying process, the inflation device 5 performs carbon dioxide blowing hardening and performs preliminary curing, so as to harden the sand mold in the process, improve the hardness and permeability of the sand mold, and increase the curing speed of the sand mold.

[0052] The water glass sand mold three-dimensional printing device proposed in the present invention, through the sand laying component 3 to lay the mixture on the bottom of the cylinder 21 to form a sand bed for sand printing, the injection component 4 sprays a water-soluble catalyst to the sand bed in the cylinder 21, the cover plate 22 covers the cylinder 21 and forms a sealed chamber, the inflation device 5 fills carbon dioxide into the sealed chamber, the sand mold printing and carbon dioxide blowing are both carried out in the cylinder 21, there is no need to change the work station, and the efficiency and accuracy of sand mold printing can be improved.

[0053] In one embodiment, Figure 1As shown, the water glass sand mold 3D printing device also includes a control device 6, which is electrically connected to the sand laying component 3, the injection component 4, the forming component 2 and the inflation device 5, and is used to control the sand laying component 3, the injection component 4, the forming component 2 and the inflation device 5 to work according to preset rules. The specific preset rules refer to the work flow of the water glass sand mold 3D printing device below, which will not be repeated here.

[0054] In one embodiment, the gas filling device 5 is connected to the cover plate 22, and is used to fill the sealed chamber with carbon dioxide through the cover plate 22. The gas filling device 5 fills the sealed chamber with carbon dioxide on the cover plate 22, so that the carbon dioxide is blown vertically from top to bottom onto the sand bed on the forming bottom plate 23, so that the carbon dioxide is fully in contact with the sand bed, which can improve the curing efficiency.

[0055] In a further embodiment, the water glass sand mold 3D printing device further includes a vacuum device (not shown in the figure), which is connected to the bottom of the cylinder 21. By setting the vacuum device in communication with the bottom of the cylinder 21, carbon dioxide is introduced into the top of the cylinder 21, and vacuum is performed at the bottom of the cylinder 21, so that the air in the capillary system in the sand mold is emptied to the maximum extent, and the CO2 gas enters the capillary system, so that the sand mold is quickly hardened under the action of the high concentration of CO2 gas, thereby improving the hardness and permeability of the sand mold.

[0056] In one embodiment, Figure 5 As shown, the frame 1 is provided with two guide rails 11, and the two guide rails 11 are arranged in parallel on both sides of the cylinder body 21; the sand laying assembly 3 includes a sand bucket 32 ​​and two first sliders 31, and the two first sliders 31 are respectively arranged below the sand bucket 32, and the first sliders 31 are slidably connected to the guide rails 11. The first sliders 31 are slidably connected to the guide rails 11, and the first sliders 31 can slide along the guide rails 11 to drive the sand bucket 32 ​​to move, and move to the top of the opening of the cylinder body 21 when the mixed material needs to be laid, and move away after the mixed material is laid, so as to facilitate the next process.

[0057] In one embodiment, Figure 5 As shown, the spray assembly 4 includes a liquid tank 42, a plurality of spray heads (not shown in the figure) and two second sliders 41. The spray heads are arranged on the liquid tank 42. The two second sliders 41 are respectively connected to the bottom of the liquid tank 42. The second slider 41 is slidably connected to the guide rail 11. The second slider 41 is slidably connected to the guide rail 11, and the second slider 41 can slide along the guide rail 11 to drive the liquid tank 42 to move. When liquid spraying is required, the liquid tank 42 is moved above the opening of the cylinder body 21. After the liquid spraying is completed, it is removed to facilitate the next process.

[0058] In a further embodiment, to accelerate curing, Figure 5 As shown, the jetting assembly 4 further includes a heating device 43, and the heating device 43 is installed on the two second sliders 41. The heating device 43 is installed on the two second sliders 41. During the water glass jetting process, the heating device 43 is kept turned on to keep the sand bed after printing at a certain temperature, which can accelerate the curing speed.

[0059] In one embodiment, Figure 5 and Figure 6 As shown, the water glass sand mold 3D printing device also includes a first driving device 7 and a first transmission mechanism 8, wherein the first driving device 7 is disposed on the frame 1, and the first transmission mechanism 8 is respectively connected to the first driving device 7, the first slider 31 and the second slider 41, and is used to drive the first slider 31 and the second slider 41 to move synchronously along the guide rail 11. The first driving device 7 can be a motor or a cylinder.

[0060] In one embodiment, Figure 5 and Figure 6 As shown, the first transmission mechanism 8 includes a first transmission rod 81, a second transmission rod 82, four first synchronous wheels 83, four second synchronous wheels 84, two first synchronous belts 85 and two second synchronous belts 86, the first transmission rod 81 is transmission-connected with the first driving device 7, the first transmission rod 81 and the second transmission rod 82 are rotatably mounted on the frame 1 and are arranged in parallel; two first synchronous wheels 83 and two second synchronous wheels 84 are arranged on the first transmission rod 81, and the remaining two first synchronous wheels 83 and two second synchronous wheels 84 are arranged on the second transmission rod 82; the first synchronous belt 85 is drivingly connected to the two first synchronous wheels 83, and the two first synchronous wheels 83 are respectively connected to the two first sliders 31, and the second synchronous belt 86 is drivingly connected to the two second synchronous wheels 84, and the two second synchronous wheels 84 are respectively connected to the two second sliders 41.

[0061] In this embodiment, the first transmission rod 81 is connected to the first driving device 7 through transmission, the first synchronous belt 85 is driven and connected to the two first synchronous wheels 83 respectively located on the first transmission rod 81 and the second transmission rod 82, and the second synchronous belt 86 is driven and connected to the two second synchronous wheels 84 respectively located on the first transmission rod 81 and the second transmission rod 82. The first driving device 7 drives the first transmission rod 81 to rotate, driving the first synchronous belt 85 and the second synchronous belt 86 to move synchronously, thereby driving the first slider 31 and the second slider 41 to move synchronously along the guide rail 11, so as to realize the movement of the injection assembly 4 toward the cylinder body 21 during the resetting of the sand paving assembly 3 after the mixture is paved, saving the time between the two processes and improving the printing efficiency.

[0062] Of course, the first transmission mechanism 8 is not limited to the above solution. In some other embodiments, the first transmission mechanism 8 may also adopt other mechanisms as long as the synchronous movement of the first slider 31 and the second slider 41 can be achieved.

[0063] In a further embodiment, Figure 5 and Figure 6 As shown, the first transmission mechanism 8 further includes a third synchronous wheel 87, a fourth synchronous wheel 88 and a third synchronous belt 89, wherein the third synchronous wheel 87 is connected to the first driving device 7, the fourth synchronous wheel 88 is arranged on the first transmission rod 81, and the third synchronous belt 89 is drivingly connected to the third synchronous wheel 87 and the fourth synchronous wheel 88. The third synchronous wheel 87 is driven to rotate by the first driving device 7, and the fourth synchronous wheel 88 is driven by the third synchronous belt 89, so as to drive the fourth synchronous wheel 88 to rotate, thereby realizing the rotation of the first transmission rod 81 connected to the fourth synchronous wheel 88 and realizing the transmission of power.

[0064] Of course, the transmission between the first driving device 7 and the first transmission rod 81 is not limited to synchronous belt transmission. In some other embodiments, the transmission between the first driving device 7 and the first transmission rod 81 can also be carried out by gear transmission, belt transmission or other mechanisms.

[0065] In actual use, the first synchronous belt 85 and the second synchronous belt 86 can be rotated forward and reversely by the first driving device 7; in some other embodiments, such as Figure 5 As shown, a group of first drive devices 7, third synchronous wheels 87, fourth synchronous wheels 88 and third synchronous belt 89 can also be set on the side of the second transmission rod 82 to drive the second transmission rod 82 to rotate, and the forward and reverse rotation of the first synchronous belt 85 and the second synchronous belt 86 can be realized through the two first drive devices 7.

[0066] In one embodiment, Figure 4 As shown, the forming assembly 2 further includes a rotating shaft 24 and two shaft seats 25, the two shaft seats 25 are connected to the frame 1, the rotating shaft 24 is rotatably mounted on the shaft seats 25, and the cover plate 22 is connected to the rotating shaft 24. The cover plate 22 is connected to the rotating shaft 24 by the rotating shaft 24 being rotatably mounted on the shaft seats 25, and the cover plate 22 can rotate together with the rotating shaft 24. When the mixed material is spread, the cover plate 22 rotates to the side of the cylinder body 21. When the carbon dioxide is filled and the vacuum is drawn, the cover plate 22 rotates to cover the cylinder body 21, which is more convenient and quick, and can improve the printing efficiency.

[0067] In one embodiment, Figure 2 and Figure 4As shown, the forming assembly 2 further includes a first electric telescopic rod 26, which is respectively connected to the cover plate 22 and the frame 1. One end of the first electric telescopic rod 26 is fixed to the frame 1, and the other end is connected to the cover plate 22, so that the cover plate 22 rotates in the first plane by the extension and retraction of the first electric telescopic rod 26.

[0068] In one embodiment, Figure 2 and Figure 4 As shown, the forming assembly 2 further includes a second electric telescopic rod 27 and a mounting plate 28, the mounting plate 28 is rotatably mounted on the frame 1, the first electric telescopic rod 26 and two shaft seats 25 are fixed on the mounting plate 28, and the second electric telescopic rod 27 is respectively connected to the frame 1 and the mounting plate 28. With one end of the second electric telescopic rod 27 being fixed to the frame 1 and the other end being connected to the mounting plate 28, the extension and retraction of the first electric telescopic rod 26 enables the mounting plate 28 to rotate in a second plane, the second plane is parallel to the mounting plate 28, and the second plane is perpendicular to the first plane.

[0069] In one embodiment, Figure 2 and Figure 4 As shown, the forming assembly 2 further includes a limit block 29 and a stop block 210, wherein the limit block 29 is disposed on the mounting plate 28, and the stop block 210 is disposed on the frame 1. When the limit block 29 abuts against the stop block 210, the cover plate 22 is coaxial with the center line of the cylinder body 21. When the limit block 29 abuts against the stop block 210, the cover plate 22 is coaxial with the center line of the cylinder body 21. At this time, the first electric telescopic rod 26 can drive the cover plate 22 to rotate in the first plane and cover the cylinder body 21, thereby realizing the limit and positioning of the cover plate 22 and improving the printing efficiency.

[0070] In one embodiment, Figure 3 As shown, the forming assembly 2 also includes a second driving device 211 and a second transmission mechanism 212. The second driving device 211 is installed on the frame 1, and the second transmission mechanism 212 is respectively connected to the second driving device 211 and the forming bottom plate 23. The second driving device 211 drives the second transmission mechanism 212 to move, driving the forming bottom plate 23 to move up and down, and cooperates with the gradual lifting and lowering during the process of paving the mixed material to achieve layer-by-layer paving of the mixed material. The second driving device 211 can be a motor or a cylinder.

[0071] In a specific embodiment, Figure 3As shown, the second transmission mechanism 212 includes a screw rod 2121 and a guide rod 2122, the screw rod 2121 is connected to the second driving device 211 and the forming bottom plate 23 respectively, the guide rod 2122 is parallel to the depth direction of the cylinder body 21, and the guide rod 2122 is guided and connected to the forming bottom plate 23. The movement of the forming bottom plate 23 is guided by the guide rod 2122, and the second driving device 211 drives the screw rod 2121 to rotate, driving the forming bottom plate 23 to move along the guide rail 11, so as to realize the lifting and lowering of the forming bottom plate 23.

[0072] Of course, the second transmission mechanism 212 is not limited to the above scheme. In some other embodiments, the second transmission mechanism 212 can also adopt a gear rack mechanism, a crank slider mechanism, etc., as long as the second transmission device can drive the forming base plate 23 to rise and fall.

[0073] The working process of the water glass sand mold 3D printing device is as follows:

[0074] Preparation stage: Slice the 3D model to be printed according to the set layer thickness to obtain the shape to be printed at different heights; Sand mixing: Evenly mix the raw foundry sand, including but not limited to quartz sand, gemstone sand, etc., with solid powder water glass and water-soluble powder additives; Sand loading: Load the mixed foundry sand into the sand paving bucket 32 ​​in the powder paving beam module for use in paving the mixed material during the printing process. The sand loading process can be performed manually or by a dedicated sand loading mechanism. When the amount of sand in the sand paving bucket 32 ​​is insufficient during the printing process, it can also be supplemented by the same method; Lay the bottom sand flat on the forming base plate 23;

[0075] The sand hopper 32 moves in translation along the guide rail 11 to the top of the opening of the cylinder body 21, and the sand outlet of the sand hopper 32 is opened to allow the internal molding sand to fall down. The sand spreading roller rotates to spread the molding sand on the forming bottom plate 23 to form a sand bed, and then the second driving device 211 drives the screw rod 2121 to drive the forming bottom plate 23 to drop by one layer thickness.

[0076] According to the slice shape of the current layer of the three-dimensional model, a water-soluble catalyst is sprayed from a nozzle to the sand bed in a designated area to wrap the molding sand. During the water glass spraying process, the heating device 43 is kept turned on to keep the sand bed at a certain temperature after printing;

[0077] After repeating the specified number of layers of the mixture and the water glass spraying process, the cover plate 22 is covered on the cylinder body 21 to form a sealed chamber, the vacuum device starts to evacuate, and the inflation device 5 blows carbon dioxide for a specified time to initially solidify the formed part;

[0078] Repeat the above steps until all layers are printed, and then perform carbon dioxide blowing to blow in enough carbon dioxide for a specified time to fully solidify the sand mold as a whole.

[0079] Based on the same inventive concept, the present invention also proposes a water glass sand mold 3D printing method, which is applied to the water glass sand mold 3D printing device, such as Figure 7 As shown, including:

[0080] Step S101: Control the sand-laying assembly 3 to move to above the opening of the cylinder 21 through the control device 6, and lay a mixture on the forming bottom plate 23 to form a sand bed, wherein the mixture includes raw sand and solid water glass powder;

[0081] Step S102: Control the sand-laying assembly 3 to move away through the control device 6, and control the spraying assembly 4 to move to above the opening of the cylinder 21, and spray the water-soluble catalyst to the sand bed in the cylinder 21;

[0082] Step S103: Control the cover plate 22 to cover the cylinder body 21 through the control device 6 to form a sealed chamber;

[0083] Step S104: Control the inflation device 5 to inject carbon dioxide into the sealed chamber through the control device 6. In this step, the injected carbon dioxide is pre-set with parameters such as temperature, pressure concentration, etc. according to the need of curing.

[0084] In some embodiments, in step S102, while spraying the water-soluble catalyst, the heating device 43 is controlled by the control device 6 to heat the sand bed. The heating device 43 heats the sand bed to keep the sand bed at a certain temperature after printing, which can accelerate the curing speed.

[0085] In some embodiments, after step S103 and before step S104, step S1031 is further included: vacuumizing the sealed chamber by controlling the vacuuming device through the control device 6. After the cover plate 22 is covered on the cylinder body 21 to form a sealed chamber, vacuuming is performed at the bottom of the cylinder body 21 through the vacuuming device. After vacuuming to a preset vacuum degree, carbon dioxide is introduced into the top of the cylinder body 21 in conjunction with the inflation device 5, so that the carbon dioxide penetrates into the sand mold and fully contacts the sand mold, which can improve the hardness and permeability of the sand mold.

[0086] Repeat the above steps until all layers are printed, then blow in enough carbon dioxide for a specified time to fully solidify the sand mold.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A water glass sand mold three-dimensional printing device, characterized in that: It comprises a frame (1), a forming component (2), a sanding component (3), a spraying component (4) and an inflation device (5), wherein: The forming assembly (2) comprises a cylinder body (21), a cover plate (22), a forming bottom plate (23), a rotating shaft (24), two shaft seats (25), a first electric telescopic rod (26), a second electric telescopic rod (27), a mounting plate (28), a limit block (29) and a stop block (210); the cylinder body (21) is fixed on the frame (1) and is provided with an opening on the top; the cover plate (22) is rotatably connected to the frame (1) and can cover the cylinder body (21) and form a sealed chamber; the forming bottom plate (23) is arranged in the cylinder body (21) and can move in a vertical direction; the two shaft seats (25) are connected to the frame (1), and the rotating shaft (24) is rotatably mounted on the shaft seat (210). 5), the cover plate (22) is connected to the rotating shaft (24), the first electric telescopic rod (26) is respectively connected to the cover plate (22) and the frame (1); the mounting plate (28) is rotatably mounted on the frame (1), the first electric telescopic rod (26) and two shaft seats (25) are fixed on the mounting plate (28), and the second electric telescopic rod (27) is respectively connected to the frame (1) and the mounting plate (28); the limit block (29) is arranged on the mounting plate (28), the stop block (210) is arranged on the frame (1), and when the limit block (29) abuts against the stop block (210), the cover plate (22) is coaxial with the center line of the cylinder body (21); The sand-laying assembly (3) is slidably mounted on the frame (1) and is disposed above the cylinder body (21), and is used to lay a mixed material on the forming bottom plate (23) to form a sand bed, wherein the mixed material comprises raw sand and solid water glass powder; The injection assembly (4) is slidably mounted on the frame (1) and is disposed above the cylinder body (21), and is used for injecting a water-soluble catalyst onto the sand bed in the cylinder body (21); The inflation device (5) is in communication with the sealed chamber and is used to inflate carbon dioxide into the sealed chamber.

2. The water glass sand mold three-dimensional printing device according to claim 1, characterized in that: The invention also comprises a control device (6), wherein the control device (6) is connected to the sand-laying component (3), the injection component (4), the forming component (2) and the inflation device (5) via electrical signals, and is used to control the sand-laying component (3), the injection component (4), the forming component (2) and the inflation device (5) to operate according to preset rules.

3. The water glass sand mold three-dimensional printing device according to claim 1, characterized in that: The inflation device (5) is connected to the cover plate (22) and is used to inflate carbon dioxide into the sealed chamber through the cover plate (22).

4. The water glass sand mold three-dimensional printing device according to claim 3, characterized in that: It also includes a vacuum pumping device, which is connected to the bottom of the cylinder body (21).

5. The water glass sand mold three-dimensional printing device according to claim 1, characterized in that: The frame (1) is provided with two guide rails (11), and the two guide rails (11) are arranged in parallel on both sides of the cylinder body (21); the sand laying assembly (3) comprises a sand bucket (32) and two first sliding blocks (31), the two first sliding blocks (31) are respectively arranged below the sand bucket (32), and the first sliding blocks (31) are slidably connected to the guide rails (11).

6. The water glass sand mold three-dimensional printing device according to claim 5, characterized in that: The spray assembly (4) comprises a liquid tank (42), a plurality of spray heads and two second sliders (41), wherein the spray heads are arranged on the liquid tank (42), the two second sliders (41) are respectively connected to the bottom of the liquid tank (42), and the second sliders (41) are slidably connected to the guide rail (11).

7. The water glass sand mold three-dimensional printing device according to claim 6, characterized in that: The injection assembly (4) further comprises a heating device (43), wherein the heating device (43) is mounted on the two second slide blocks (41).

8. The water glass sand mold three-dimensional printing device according to claim 7, characterized in that: The machine also comprises a first driving device (7) and a first transmission mechanism (8), wherein the first driving device (7) is arranged on the frame (1), and the first transmission mechanism (8) is respectively connected to the first driving device (7), the first slider (31) and the second slider (41), and is used to drive the first slider (31) and the second slider (41) to move synchronously along the guide rail (11).

9. The water glass sand mold three-dimensional printing device according to claim 8, characterized in that: The first transmission mechanism (8) comprises a first transmission rod (81), a second transmission rod (82), four first synchronous wheels (83), four second synchronous wheels (84), two first synchronous belts (85) and two second synchronous belts (86); the first transmission rod (81) is transmission-connected to the first driving device (7); the first transmission rod (81) and the second transmission rod (82) are rotatably mounted on the frame (1) and arranged in parallel; two first synchronous wheels (83) and two second synchronous wheels (84) are arranged on the first transmission rod (81); the remaining two first synchronous wheels (83) and two second synchronous wheels (84) are arranged on the second transmission rod (82); the first synchronous belt (85) is drivingly connected to the two first synchronous wheels (83), the two first synchronous wheels (83) are respectively connected to the two first sliders (31); the second synchronous belt (86) is drivingly connected to the two second synchronous wheels (84), the two second synchronous wheels (84) are respectively connected to the two second sliders (41).

10. The water glass sand mold three-dimensional printing device according to claim 9, characterized in that: The first transmission mechanism (8) further comprises a third synchronous wheel (87), a fourth synchronous wheel (88) and a third synchronous belt (89); the third synchronous wheel (87) is connected to the first driving device (7); the fourth synchronous wheel (88) is arranged on the first transmission rod (81); and the third synchronous belt (89) is drivingly connected to the third synchronous wheel (87) and the fourth synchronous wheel (88).

11. The water glass sand mold three-dimensional printing device according to any one of claims 1 to 10, characterized in that: The forming assembly (2) further comprises a second driving device (211) and a second transmission mechanism (212); the second driving device (211) is mounted on the frame (1); and the second transmission mechanism (212) is respectively connected to the second driving device (211) and the forming bottom plate (23).

12. The water glass sand mold three-dimensional printing device according to claim 11, characterized in that: The second transmission mechanism (212) comprises a screw rod (2121) and a guide rod (2122); the screw rod (2121) is respectively connected to the second drive device (211) and the forming base plate (23); the guide rod (2122) is parallel to the depth direction of the cylinder body (21); and the guide rod (2122) is guided and connected to the forming base plate (23).

13. A water glass sand mold three-dimensional printing method, applied to the water glass sand mold three-dimensional printing device according to any one of claims 2 to 12, characterized in that: include: The sand-laying assembly (3) is controlled by a control device (6) to move to above the opening of the cylinder body (21), and to lay a mixture on the forming bottom plate (23) to form a sand bed, wherein the mixture includes raw sand and solid water glass powder; The sand-laying assembly (3) is controlled to move away by a control device (6), and the spraying assembly (4) is controlled to move to above the opening of the cylinder (21), so as to spray a water-soluble catalyst onto the sand bed in the cylinder (21); The control device (6) controls the cover plate (22) to cover the cylinder body (21) and form a sealed chamber; The control device (6) controls the inflation device (5) to inject carbon dioxide into the sealed chamber.

Images