A 3D printing sand grading device

Abstract

The present invention provides a 3D printing sand grading device, which relates to the technical field of 3D printing sand grading equipment. The 3D printing sand grading device includes: a mounting base and a plurality of hydraulic classifiers arranged above the mounting base. The plurality of hydraulic classifiers are vertically distributed, and filter sleeves are provided in each of the plurality of hydraulic classifiers. A side frame plate is fixedly installed at the top of the mounting base, and a plurality of guiding sliding plates are slidably installed on the side frame plate. Connecting frames are fixedly installed on the outer walls of the plurality of hydraulic classifiers, and one sides of the plurality of guiding sliding plates close to the hydraulic classifiers are respectively fixedly connected to the plurality of connecting frames. A U-shaped connecting frame is fixedly installed at the top of the mounting base, and a vertical lead screw is rotatably installed in the U-shaped connecting frame. The present invention can form multiple grading preparations, and can ensure the uniformity of the silica sand particle size to the greatest extent.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing sand grading equipment, and in particular to a 3D printing sand grading device. Background Art

[0002] ‌3D printing sand is a special material used in 3D printing technology. It is widely used in 3D printing sand molds for castings in the fields of aerospace, military industry, shipbuilding, rail transportation, wind power generation, etc. This sand mold material is usually composed of quartz sand, binder and other additives. Since the main component of quartz sand is silicon dioxide, quartz sand is also called silica sand. It has a specific particle size distribution and chemical composition, which can meet the various requirements of 3D printing technology. Before using 3D printing sand, different particle sizes in the silica sand raw material are selected and separated, and the particle size that meets the use requirements in the silica sand raw material is screened out. The silica sand raw material will be multi-stage screened and prepared, and silica sand that meets the particle size requirements will be obtained. The commonly used multi-stage screening and preparation tools are generally hydraulic classifiers. This hydraulic classifier is a particle size grading equipment with good performance, with the advantages of high efficiency, low energy consumption, and no noise. It is widely used in the professional field of mineral grading.

[0003] However, in the process of using a hydraulic classifier for grading and mixing, since the hydraulic classifier is generally used alone, the sand particles form relatively tight clumps due to adhesion, gravity or external pressure in a wet state, resulting in compaction. Compaction will lead to uneven distribution between the sand particles, affecting the final grading effect, making the particle size distribution of the sand not meet the design requirements. At the same time, the compacted sand particles accumulate on the inner wall of the hydraulic classifier and are difficult to be washed and dispersed by water flow, resulting in the inability to remove impurities and fine particles during the water washing process, reducing the overall efficiency of the water washing, and causing the residual impurities to have an adverse effect on the performance of the sand. In the prior art, the compaction phenomenon in the hydraulic classifier is mainly dealt with by manual shoveling or using high-pressure water, but this method requires multiple people to cooperate with each other, and the efficiency of dealing with the compaction phenomenon is too low, reducing the grading efficiency of silica sand.

[0004] Therefore, it is necessary to provide a 3D printing sand grading device to solve the above technical problems. Summary of the invention

[0005] The object of the present invention is to provide a 3D printing sand grading device which can form multiple grading preparations and can ensure the uniformity of silica sand particle size to the greatest extent.

[0006] To solve the above technical problems, the 3D printing sand grading device provided by the present invention includes: a mounting base and a plurality of hydraulic classifiers arranged above the mounting base. The plurality of hydraulic classifiers are vertically distributed, and filter sleeves are provided in each of the plurality of hydraulic classifiers. A side frame plate is fixedly installed at the top of the mounting base, and a plurality of guiding sliding plates are slidably installed on the side frame plate. Connecting frames are fixedly installed on the outer walls of the plurality of hydraulic classifiers, and one side of each of the plurality of guiding sliding plates close to the hydraulic classifier is fixedly connected to one of the plurality of connecting frames respectively. A U-shaped connecting frame is fixedly installed at the top of the mounting base, a vertical lead screw is rotatably installed in the U-shaped connecting frame, a first servo motor is fixedly installed at the top of the U-shaped connecting frame, and the output shaft of the first servo motor is fixedly connected to the top end of the vertical lead screw. A lifting arm is threadedly installed on the vertical lead screw, a bearing shaft is rotatably installed on the lifting arm, a fixed frame is fixedly installed at the bottom end of the bearing shaft, a linkage frame is fixedly installed at the bottom of the fixed frame, side positioning frames are fixedly installed on the outer walls of both sides of the linkage frame, rectangular sliding rods are slidably installed on one side of each of the two side positioning frames away from each other, scraping blades are fixedly installed on one side of each of the two rectangular sliding rods away from each other, first pulling springs are sleeved on each of the two rectangular sliding rods, one end of each of the two first pulling springs close to each other is fixedly connected to one of the two side positioning frames respectively, and the end of each of the two first pulling springs away from each other is fixedly connected to one of the two scraping blades respectively. A rotating mechanism is provided on the lifting arm to drive the scraping blade to rotate clockwise and counterclockwise alternately, and an expanding mechanism is provided in the linkage frame to form a抵触 against the scraping blade so that the scraping blade contacts the inner wall of the hydraulic classifier; the expanding mechanism includes a first threaded rod, the first threaded rod is threadedly installed in the linkage frame, a second servo motor is fixedly installed at the top of the linkage frame, the output shaft of the second servo motor is fixedly connected to the top end of the first threaded rod, a linkage block is threadedly installed on the first threaded rod, push arms are hinged on both sides of the linkage block, one side of each of the two push arms away from each other extends outside the linkage frame and contacts the corresponding scraping blade, and the two push arms are respectively movably connected to both sides of the linkage frame. Arc-shaped rod frames are fixedly installed on both sides of the linkage frame, second pulling springs are sleeved on each of the two arc-shaped rod frames, one end of each of the two second pulling springs close to each other is fixedly connected to the outer walls of both sides of the linkage frame respectively, and the end of each of the two second pulling springs away from each other is fixedly connected to one of the two push arms respectively.

[0007] Preferably, the rotating mechanism includes a curve groove opened on the bearing shaft, a second rodless cylinder is fixedly installed at the top of the lifting arm, a guiding rod is fixedly installed on the slider of the second rodless cylinder, and one end of the guiding rod extends into the curve groove and contacts the inner wall of the curve groove.

[0008] Preferably, a first positioning groove is formed on the top of each of the guide slides, a backrest plate is fixedly installed on the top of the mounting base, a plurality of first telescopic cylinders are fixedly installed on one side of the backrest plate, a plurality of linkage plates are slidably installed on the backrest plate, the output shafts of the plurality of first telescopic cylinders are respectively fixedly connected to the plurality of linkage plates, a first positioning head is fixedly installed on the bottom of each of the linkage plates, and the bottom ends of the plurality of first positioning heads respectively extend into the plurality of first positioning grooves.

[0009] Preferably, a plurality of the guide slides are fixedly installed with a retaining block on one side away from the hydraulic classifier, a second positioning groove is opened on the top of the plurality of retaining blocks, a concave mounting frame is fixedly installed on the top of the mounting base, a transverse screw is rotatably installed in the concave mounting frame, a transverse push seat is threadedly installed on the transverse screw, a transverse loading plate is provided above the concave mounting frame, two connecting bars are fixedly installed on the side of the transverse push seat close to the transverse loading plate, the same-direction sides of the two connecting bars are fixedly connected to the transverse loading plate, and a third servo is fixedly installed on the outer wall of one side of the concave mounting frame The servo motor, the output shaft of the third servo motor is fixedly connected to the transverse screw, a plurality of through holes are opened on the transverse carrier plate, and the plurality of retaining blocks are respectively matched with the plurality of through holes, and a plurality of first rodless cylinders are fixedly installed on the side of the transverse carrier plate away from the side frame plate, and connecting plates are fixedly installed on the sliders of the plurality of first rodless cylinders, and the plurality of connecting plates respectively penetrate the plurality of through holes and are movably connected to the transverse carrier plate, and a second positioning head is fixedly installed on the bottom of the plurality of connecting plates, and the plurality of second positioning heads are respectively matched with the plurality of second positioning grooves.

[0010] Preferably, a discharge hopper is fixedly mounted on the top of the mounting base, and the discharge hopper is located below the lowest hydraulic classifier.

[0011] Preferably, two positioning seats are fixedly installed on the inner walls of the plurality of hydraulic classifiers, and the tops of the plurality of positioning seats are provided with mounting grooves, and the sides of the two corresponding mounting grooves close to each other are set as openings, and the inner walls of the two corresponding mounting grooves away from each other are provided with third positioning grooves, and the plurality of filter sleeves are provided with positioning mechanisms, and the plurality of positioning mechanisms are adapted to the corresponding third positioning grooves.

[0012] Preferably, any one of the positioning mechanisms includes two rectangular frames, the two rectangular frames are fixedly connected to the outer walls of both sides of the corresponding filter sleeves, a stretching rod is slidably installed on the top of the two rectangular frames, and a hinged arm is rotatably installed on the bottom ends of the two stretching rods, and the two hinged arms are hingedly connected to a third positioning head on the side away from each other, and the two third positioning heads extend out of the two rectangular frames on the sides away from each other and are slidably connected to the corresponding rectangular frames, and the two third positioning heads are inserted into the two third positioning grooves on the sides away from each other, and a pull plate is fixedly installed on the top of the two stretching rods, and a return spring is sleeved on the two stretching rods, and the tops of the two return springs are fixedly connected to the two pull plates, and the bottoms of the two return springs are fixedly connected to the tops of the two rectangular frames.

[0013] Preferably, the two stretching rods are fixedly sleeved with a limit ring, the two limit rings are respectively located in the two rectangular frames, and the limit rods are fixedly installed on the inner walls of the two rectangular frames on the side away from each other, and the two limit rods are slidably installed with limit blocks, and the tops of the two limit blocks are respectively fixedly connected to the two third positioning heads.

[0014] Preferably, a storage barrel is provided above the hydraulic classifier located at the top, a discharge pipe is fixedly installed on one side of the storage barrel, a third rodless cylinder is fixedly installed on the outer wall of one side of the storage barrel, a sealing plate is fixedly installed on the slider of the third rodless cylinder, a block is fixedly installed on the side of the sealing plate away from the storage barrel, a connecting folding plate is fixedly installed on the storage barrel, a second threaded rod is threadedly installed on the connecting folding plate, a limiting plate is rotatably installed on the bottom end of the second threaded rod, and the limiting plate is adapted to the block.

[0015] Preferably, a support column is fixedly installed on the top of the side frame plate, and the top of the support column is fixedly connected to the storage barrel. A horizontal platform is fixedly installed on the side of the support column away from the hydraulic classifier, and a second telescopic cylinder is fixedly installed on the bottom of the horizontal platform. The output shaft of the second telescopic cylinder passes through the horizontal platform and is slidably connected to the horizontal platform, and an impact plate is fixedly installed on the output shaft of the second telescopic cylinder.

[0016] Compared with the related art, the 3D printing sand grading device provided by the present invention has the following beneficial effects:

[0017] (1) By setting up multiple hydraulic classifiers in a vertical stack, a batch of silica sand raw materials can be subjected to multiple grading and preparation processes, thereby ensuring the particle size uniformity of each grade of silica sand to the greatest extent.

[0018] (2) By means of the cooperation of the first positioning groove and the first positioning head, and the second positioning groove and the second positioning head, one of the hydraulic classifiers can be horizontally moved to the bottom of the scraper blade, and then the scraper blade can be brought into the hydraulic classifier by means of the cooperation of the vertical lead screw and the lifting arm, so that the attachments on the inner wall can be scraped off. Compared with the traditional method of manually entering the hydraulic classifier for cleaning, or using high-pressure water to flush and clean, this method is more convenient and saves manpower. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is one of the front schematic views of the first embodiment of the 3D printing sand grading device provided by the present invention;

[0020] Figure 2 The second schematic front view of the first embodiment of the 3D printing sand grading device provided by the present invention;

[0021] Figure 3 A schematic structural diagram of a side frame plate in a first embodiment of a 3D printing sand grading device provided by the present invention;

[0022] Figure 4 A side view assembly diagram of multiple hydraulic classifiers in the first embodiment of the 3D printing sand grading device provided by the present invention;

[0023] Figure 5 A schematic diagram of the connection structure between the linkage plate and the first positioning head in the first embodiment of the 3D printing sand grading device provided by the present invention;

[0024] Figure 6 A schematic diagram of the connection structure of the hydraulic classifier, the connection frame and the guide slide plate in the first embodiment of the 3D printing sand grading device provided by the present invention;

[0025] Figure 7 It is a schematic diagram of the assembly of the transverse moving loading plate and the transverse pushing seat in the first embodiment of the 3D printing sand grading device provided by the present invention;

[0026] Figure 8 A schematic diagram of the connection structure of the connecting piece and the second positioning head in the first embodiment of the 3D printing sand grading device provided by the present invention;

[0027] Fig. 9 A schematic diagram of the connection structure between the filter sleeve and the rectangular frame in the first embodiment of the 3D printing sand grading device provided by the present invention;

[0028] Fig.10 A partial cross-sectional structural schematic diagram of a hydraulic classifier in the first embodiment of the 3D printing sand grading device provided by the present invention;

[0029] Fig.11 for Fig.10Schematic diagram of the enlarged structure of part A shown

[0030] Fig.12 Schematic diagram of the connection structure of the bearing shaft, fixed frame and linkage frame in the first embodiment of the 3D printing sand gradation device provided by the present invention

[0031] Fig.13 Schematic diagram of the assembly structure of the linkage frame and the scraping blade in the first embodiment of the 3D printing sand gradation device provided by the present invention

[0032] Fig.14 Front view schematic diagram of the second embodiment of the 3D printing sand gradation device provided by the present invention

[0033] Fig.15 Schematic diagram of the structure of the storage bucket in the second embodiment of the 3D printing sand gradation device provided by the present invention

[0034] Reference numerals in the figure: 1, installation base; 2, side frame plate; 3, hydraulic classifier; 4, discharge hopper; 5, connection frame; 6, guide slide plate; 7, first positioning groove; 8, back plate; 9, first telescopic cylinder; 10, linkage plate; 11, first clamping head; 12, retaining block; 13, second positioning groove; 14, transverse transfer plate; 15, first rodless cylinder; 16, connecting piece; 17, second clamping head; 18, concave mounting frame; 19, transverse lead screw; 20, transverse push seat; 21, bridging bar; 22, C-shaped connecting frame; 23, vertical lead screw; 24, lifting arm; 25, bearing shaft; 26, fixed frame; 27, linkage frame; 28, side positioning frame; 29, rectangular slide rod; 30, scraping blade; 31, first pulling spring; 32, first threaded rod; 33, linkage block; 34, pushing movable arm; 35, arc-shaped rod; 36, second pulling spring; 37, curve groove; 38, second rodless cylinder; 39, guiding rod; 40, positioning seat; 41, placement groove; 42, filter sleeve; 43, rectangular frame; 44, third positioning groove; 45, stretching rod; 46, hinged arm; 47, third clamping head; 48, pulling plate; 49, reset spring; 50, limiting ring; 51, storage bucket; 52, discharge pipe; 53, third rodless cylinder; 54, blocking plate; 55, stop block; 56, connecting folding plate; 57, second threaded rod; 58, limiting piece; 59, support column; 60, second telescopic cylinder; 61, impact plate Detailed implementation manners

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments

[0036] First embodiment:

[0037] Please refer to in conjunction with Figure 1-Figure 13, in the first embodiment of the present invention, the 3D printing sand grading device includes: a mounting base 1 and a plurality of hydraulic classifiers 3 arranged above the mounting base 1, and the plurality of hydraulic classifiers 3 are vertically distributed. The hydraulic classifier 3 is a common hydraulic classifier device on the market, having an overflow pipe, a water inlet pipe and a drain pipe, and a discharge port is provided at its bottom, and a valve is provided on the discharge port. A filter sleeve 42 is provided in each of the plurality of hydraulic classifiers 3. In order to drain the screened silica sand, a discharge hopper 4 is fixed on the top of the mounting base 1, and the discharge hopper 4 is located below the lowermost hydraulic classifier 3. A side frame plate 2 is fixed on the top of the mounting base 1, and a plurality of guiding sliders 6 are slidably mounted thereon. Connecting frames 5 are fixed on the outer walls of the plurality of hydraulic classifiers 3, and one side of each guiding slider 6 close to the hydraulic classifier 3 is fixedly connected to the plurality of connecting frames 5 respectively. A U-shaped connecting frame 22 is fixed on the top of the mounting base 1, and a vertical lead screw 23 is rotatably mounted therein. A first servo motor is fixed on the top of the U-shaped connecting frame 22, and its output shaft is fixedly connected to the top end of the vertical lead screw 23. A lifting arm 24 is threadedly mounted on the vertical lead screw 23. In order to ensure the stable linear lifting of the lifting arm 24, two vertical bars are fixed in the U-shaped connecting frame 22, and both vertical bars penetrate through the lifting arm 24 and are slidably connected thereto. A bearing shaft 25 is rotatably mounted on the lifting arm 24, and a fixed frame 26 is fixed to its bottom end. A linkage frame 27 is fixed to the bottom of the fixed frame 26. Side positioning frames 28 are fixed on the outer walls of both sides of the linkage frame 27. Rectangular sliding rods 29 are slidably mounted on one side of the two side positioning frames 28 away from each other. Scraping blades 30 are fixed on one side of the two rectangular sliding rods 29 away from each other. First return springs 31 are sleeved on the two rectangular sliding rods 29. One end of the two first return springs 31 close to each other is fixedly connected to the two side positioning frames 28 respectively, and the end away from each other is fixedly connected to the two scraping blades 30 respectively. The first return spring 31 plays an elastic pulling-back role and can pull the scraping blade 30 back to its original state. In order to rotate the scraping blade 30 in the hydraulic classifier 3, a rotating mechanism is provided on the lifting arm 24 to drive the scraping blade 30 to rotate clockwise and counterclockwise alternately. And an expanding mechanism is provided in the linkage frame 27 to form a抵触 against the scraping blade 30, so that the scraping blade 30 contacts the inner wall of the hydraulic classifier 3;

[0038] It should be noted that the Chinese character "抵触" in the original text may be a misspelling. It is guessed that it might be "抵触" (resist). If this is not what you want, please provide more accurate information.The expansion mechanism includes a first threaded rod 32, which is threadedly installed in the linkage frame 27. A second servo motor is fixed on the top of the linkage frame 27, and its output shaft is fixedly connected to the top of the first threaded rod 32. A linkage block 33 is threadedly installed on the first threaded rod 32, and both sides of the linkage block 33 are hinged with push-pushing movable arms 34. The two push-pushing movable arms 34 extend away from each other on the sides outside the linkage frame 27 and contact with the corresponding scraper 30. Active openings are opened on both sides of the linkage frame 27, and the two push-pushing movable arms 34 pass through the two active openings respectively. The push movable arm 34 contacts the inner walls on both sides of the movable opening. In the initial state, the push movable arm 34 contacts the outer edge of the top of the movable opening. Arc-shaped rack rods 35 are fixed on both sides of the linkage frame 27. The two arc-shaped rack rods 35 are sleeved with second return springs 36. The ends of the two second return springs 36 that are close to each other are fixedly connected to the outer walls on both sides of the linkage frame 27, and the ends of the two second return springs 36 that are far away from each other are fixedly connected to the two push movable arms 34. In addition, the scraper 30 is pushed by the expansion mechanism, so that the scraper 30 can still contact the inner wall of the hydraulic classifier 3 when it is worn.

[0039] The above-mentioned rotating mechanism includes a curved groove 37, which is opened on the load-bearing shaft 25. A second rodless cylinder 38 is fixed to the top of the lifting arm 24, and a guide rod 39 is fixed to the slider thereon. One end of the guide rod 39 extends into the curved groove 37 and contacts with the inner wall of the curved groove 37. Through the cooperation between the guide rod 39 and the curved groove 37, the load-bearing shaft 25 can be driven to rotate.

[0040] In this method, in order to form a positioning effect for the hydraulic classifier 3, first positioning grooves 7 are opened on the tops of the multiple guide slides 6, a backrest plate 8 is fixed on the top of the mounting base 1, and multiple first telescopic cylinders 9 are fixed on one side of the backrest plate 8. Multiple linkage plates 10 are slidably installed on the backrest plate 8, and the output shafts of the multiple first telescopic cylinders 9 are respectively fixedly connected to the multiple linkage plates 10, and the bottoms of the multiple linkage plates 10 are fixed with first locking heads 11, and the bottom ends of the multiple first locking heads 11 extend into the multiple first positioning grooves 7 respectively, and the locking effect between the two is used to form a limiting effect, so that the hydraulic classifier 3 is fixed.

[0041] In this embodiment, in order to push one of the hydraulic classifiers 3 to move, a retaining block 12 is fixed on one side of the plurality of guide slides 6 away from the hydraulic classifier 3, and a second positioning groove 13 is provided on the top of the plurality of retaining blocks 12. A concave mounting frame 18 is fixed on the top of the mounting base 1, in which a transverse lead screw 19 is rotatably installed, and a third servo motor is fixed on the outer wall of one side of the concave mounting frame 18, and its output shaft is fixedly connected to the transverse lead screw 19, and a transverse push seat 20 is threadedly installed on the transverse lead screw 19. At the same time, two transverse bars are fixed in the concave mounting frame 18, and the two transverse bars both penetrate the transverse push seat 20 and are slidably connected thereto. A transverse loading plate 14 is provided above the mounting frame 18, and a transverse pushing seat 20 is fixed to the transverse loading plate 14 by two frame connecting strips 21. A plurality of through holes are opened on the transverse loading plate 14, and a plurality of retaining blocks 12 are respectively matched with the plurality of through holes. A plurality of first rodless cylinders 15 are fixed to the side of the transverse loading plate 14 away from the side frame plate 2, and connecting plates 16 are fixed on the sliders of the plurality of first rodless cylinders 15. The plurality of connecting plates 16 respectively penetrate the plurality of through holes and are movably connected with the transverse loading plate 14, and a second positioning head 17 is fixed to the bottom of the plurality of connecting plates 16, and the plurality of second positioning heads 17 are respectively matched with the plurality of second positioning grooves 13.

[0042] In the present embodiment, in order to facilitate the disassembly and assembly of the filter sleeve 42, two positioning seats 40 are fixed on the inner walls of the plurality of hydraulic classifiers 3, and a placement groove 41 is provided on the top of the plurality of positioning seats 40, and the sides of the corresponding two placement grooves 41 close to each other are set as openings, and the inner walls of the corresponding two placement grooves 41 away from each other are provided with a third positioning groove 44, and a positioning mechanism is provided on the plurality of filter sleeves 42, and the plurality of positioning mechanisms are adapted to the corresponding third positioning groove 44, wherein any positioning mechanism includes two rectangular frames 43, and the two rectangular frames 43 are fixedly connected to the outer walls of the two sides of the corresponding filter sleeve 42, and a stretching rod 45 is slidably installed on the top of the two rectangular frames 43, and the bottom ends of the two stretching rods 45 are rotatably installed with a hinged arm 46, and the sides of the two hinged arms 46 away from each other are hinged with a third positioning head 47, and the sides of the two third positioning heads 47 away from each other extend to the two rectangular The two third positioning heads 47 are respectively inserted into the two third positioning grooves 44 on the sides away from each other, and the tops of the two stretching rods 45 are fixed with pull plates 48, and the two stretching rods 45 are respectively sleeved with return springs 49, and the tops of the two return springs 49 are respectively fixedly connected to the two pull plates 48, and the bottom ends of the two return springs 49 are respectively fixedly connected to the tops of the two rectangular frames 43, and the two stretching rods 45 are respectively sleeved with limit rings 50, and the two limit rings 50 are respectively located in the two rectangular frames 43, and the limit rods are fixed on the inner walls of the two rectangular frames 43 on the sides away from each other, and the two limit rods are slidably installed with limit blocks, and the tops of the two limit blocks are respectively fixedly connected to the two third positioning heads 47, and by pulling the pull plate 48, the stretching rod 45 is lifted up, and then the third positioning head 47 can be brought out of the third positioning groove 44, thereby realizing the removal of the filter sleeve 42.

[0043] In this embodiment

[0044] When in use, it is used in conjunction with an external lift, and in the initial state, the overflow pipe on the hydraulic classifier 3 is connected to the external wastewater tank through a hose, and the water inlet pipe on the hydraulic classifier 3 is connected to the external water pump through a hose, and the water outlet pipe on the hydraulic classifier 3 is connected to the external wastewater tank through a hose;

[0045] When the silica sand raw material needs to be graded and prepared, the silica sand raw material is poured into the uppermost hydraulic classifier 3 so that the silica sand can be screened. After each screening, the screened silica sand is discharged downward through the discharge port at the bottom of the hydraulic classifier 3 to the next hydraulic classifier 3 for screening, and this process is repeated until the silica sand discharged from the lowermost hydraulic classifier 3 meets the required particle size standard and is discharged to the next process through the discharge hopper 4.

[0046] After the silica sand is graded and prepared, in order to quickly clean the inside of the hydraulic classifier 3, you can start from the top hydraulic classifier 3, first start the corresponding first rodless cylinder 15, and the slider thereon brings the corresponding second positioning head 17 down, so that the second positioning head 17 is inserted into the corresponding second positioning groove 13, and then start the output shaft of the corresponding first telescopic cylinder 9 to extend, drive the corresponding first positioning head 11 to rise, and move it out of the corresponding first positioning groove 7. At this time, the top hydraulic classifier 3 forms a linkage relationship with the transverse carrier plate 14, and then start the third servo motor in the positive direction, and its output shaft drives the transverse screw 19 to rotate, so that it can move the transverse push seat 20 and the transverse carrier plate 14 toward the direction of the side frame plate 2. At this time, the top hydraulic classifier 3 will move horizontally, and finally move the hydraulic classifier 3 to the bottom of the two scrapers 30;

[0047] Subsequently, the worker is lifted to the corresponding position of the hydraulic classifier 3 by means of a lift, and then the corresponding two pull plates 48 are lifted upward. As the two pull plates 48 are lifted upward, the two third positioning heads 47 move toward each other under the linkage of the articulated arms 46, thereby moving out of the corresponding third positioning grooves 44, and then the filter sleeve 42 is lifted out. At this time, the two return springs 49 are in a stretched state.

[0048] Then, the first servo motor is started in the positive direction, and its output shaft drives the vertical lead screw 23 to rotate, so that the lifting arm 24 begins to descend, until the two scrapers 30 move into the uppermost hydraulic classifier 3, and then the first servo motor is turned off. Subsequently, the second servo motor is started in the positive direction, and its output shaft drives the first threaded rod 32 to rotate, so that the linkage block 33 rises. During its rising process, the two push movable arms 34 are gradually unfolded, thereby moving against the two scrapers 30. At this time, the first return spring 31 and the second return spring 36 are both in a stretched state, and the second servo motor can be turned off until the two scrapers 30 touch the inner wall of the hydraulic classifier 3. At this time, the two scrapers 30 are located below the positioning seat 40, and then the second rodless cylinder 38 is started, and the slider on it begins to descend. During the descent, the guide rod 39 will slide in the curved groove 37, and then it can rotate with the bearing shaft 25, so that the scraper 30 rotates in the hydraulic classifier 3, and after the slider on the second rodless cylinder 38 drops to the lowest position, it is raised again, and the bearing shaft 25 will rotate, and then it is driven to descend, and then driven to rise, and so on, so that the scraper 30 rotates alternately clockwise and counterclockwise in the hydraulic classifier 3, so that the attachments on the inner wall of the hydraulic classifier 3 can be scraped off;

[0049] After scraping is completed, the second servo motor is started in the reverse direction to separate the scraper blade 30 from the inner wall of the hydraulic classifier 3, and then the first servo motor is started in the reverse direction to bring the scraper blade 30 out of the hydraulic classifier 3. Subsequently, the pull plates 48 on both sides of the filter sleeve 42 are lifted. At this time, the two third positioning heads 47 are retracted into the corresponding rectangular frames 43, and the return springs 49 are in a stretched state. Then, the two rectangular frames 43 are placed in the corresponding placement grooves 41, and the pull plates 48 are released. The stretched return springs 49 begin to pull back, and finally the corresponding two third positioning heads 47 are pushed into the corresponding third positioning grooves 44, thereby completing the installation of the filter sleeve 42. After that, the staff can install the debris box on the elevator and install it below the discharge port of the hydraulic classifier 3. Then, the valve on the discharge port is opened to discharge the scraped debris.

[0050] Then, the remaining interiors of the hydraulic classifiers 3 are scraped and cleaned in sequence in the same manner as above.

[0051] Compared with the related art, the 3D printing sand grading device provided by the present invention has the following beneficial effects:

[0052] (1) By setting up a plurality of hydraulic classifiers 3 in a vertically stacked form, a batch of silica sand raw materials can be subjected to multiple grading and preparation processes, thereby ensuring the particle size uniformity of each grade of silica sand to the greatest extent.

[0053] (2) By means of the cooperation of the first positioning groove 7 and the first positioning head 11, and the second positioning groove 13 and the second positioning head 17, one of the hydraulic classifiers 3 can be horizontally moved to the bottom of the scraper 30, and then the scraper 30 can be brought into the hydraulic classifier 3 by means of the cooperation of the vertical lead screw 23 and the lifting arm 24, so that the attachments on the inner wall can be scraped off. Compared with the traditional method of manually entering the hydraulic classifier 3 for cleaning, or using high-pressure water to flush and clean, this method is more convenient and saves manpower.

[0054] Second embodiment:

[0055] Based on the 3D printing sand grading device provided in the first embodiment of the present application, the second embodiment of the present application proposes another 3D printing sand grading device. The second embodiment is only a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

[0056] The second embodiment of the present invention is further described below in conjunction with the accompanying drawings and implementation modes.

[0057] Please refer to Figure 14-15The 3D printing sand grading device also includes a storage barrel 51, which is arranged above the topmost hydraulic classifier 3. A discharge pipe 52 is fixed to one side of the storage barrel 51, and a third rodless cylinder 53 is fixed to the outer wall of one side of the storage barrel 51. A blocking plate 54 is fixed to the slider of the third rodless cylinder 53, and a stopper 55 is fixed to the side of the blocking plate 54 away from the storage barrel 51. A connecting folding plate 56 is fixed to the storage barrel 51, and a second threaded rod 57 is threadedly installed on the connecting folding plate 56, and a limiting plate 58 is rotatably installed at the bottom end thereof. The limiting plate 58 is adapted to the stopper 55, and in order to ensure that the limiting plate 58 can only be lifted linearly, a scale rod is slidably installed on the connecting folding plate 56. The bottom end of the rod is fixed to the limit plate 58, and there are scale lines on the scale rod, which is convenient for people to adjust the limit plate 58 to the specified position. In addition, a support column 59 is fixed on the top of the side frame plate 2, and the top of the support column 59 is fixedly connected to the storage barrel 51. A horizontal platform is fixed on the side of the support column 59 away from the hydraulic classifier 3, and a second telescopic cylinder 60 is fixed at the bottom of the horizontal platform. Its output shaft passes through the horizontal platform and is slidably connected to the horizontal platform. An impact plate 61 is fixed on the output shaft of the second telescopic cylinder 60. The extension of the output shaft of the second telescopic cylinder 60 causes a collision between the impact plate 61 and the storage barrel 51, which can then cause vibration to the silica sand raw material in the storage barrel 51 to prevent the raw material from being blocked.

[0058] In this embodiment

[0059] A large amount of silica sand raw material is stored in the storage barrel 51 in advance;

[0060] When it is necessary to pour the silica sand raw material into the uppermost hydraulic classifier 3, the discharge diameter of the discharge pipe 52 is first adjusted according to the amount of each pouring. When adjusting, the second threaded rod 57 is first rotated to make the limit plate 58 drop. When it drops to a specified height, the third rodless cylinder 53 is started, and the slider thereon rises with the blocking plate 54, thereby opening the discharge pipe 52. When the stopper 55 on the blocking plate 54 contacts the limit plate 58, the blocking plate 54 no longer rises. At this time, the diameter of the discharge pipe 52 is already at its maximum state, and the silica sand raw material therein is also discharged and enters the hydraulic classifier 3. After a certain amount is discharged, the third rodless cylinder 53 is started, and the slider thereon drops, and the discharge pipe 52 is blocked by the blocking plate 54 again.

[0061] In subsequent use, when the silica sand in the storage barrel 51 is blocked and cannot flow, the output shaft of the second telescopic cylinder 60 can be activated to extend, so that the impact plate 61 rises and collides with the storage barrel 51, thereby causing the storage barrel 51 to vibrate. The vibration force can provide kinetic energy to the silica sand raw material, so that the silica sand will not be blocked and can flow again.

[0062] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A 3D printing sand grading device, comprising a mounting base and a plurality of hydraulic classifiers arranged above the mounting base, wherein the plurality of hydraulic classifiers are vertically distributed, and a filter sleeve is arranged in each of the plurality of hydraulic classifiers, characterized in that: A side frame plate is fixedly installed on the top of the installation base. A plurality of guiding sliding plates are slidably installed on the side frame plate. Connecting frames are fixedly installed on the outer walls of a plurality of the hydraulic classifiers. One sides of the plurality of guiding sliding plates close to the hydraulic classifiers are respectively fixedly connected to the plurality of connecting frames. A U-shaped connecting frame is fixedly installed on the top of the installation base. A vertical lead screw is rotatably installed in the U-shaped connecting frame. A first servo motor is fixedly installed on the top of the U-shaped connecting frame. The output shaft of the first servo motor is fixedly connected to the top end of the vertical lead screw. A lifting arm is threadedly installed on the vertical lead screw. A bearing shaft is rotatably installed on the lifting arm. A fixed frame is fixedly installed at the bottom end of the bearing shaft. A linkage frame is fixedly installed at the bottom of the fixed frame. Side positioning frames are fixedly installed on the outer walls of both sides of the linkage frame. Rectangular sliding rods are slidably installed on one sides of the two side positioning frames away from each other. Scraping blades are fixedly installed on one sides of the two rectangular sliding rods away from each other. First return springs are sleeved on the two rectangular sliding rods. One ends of the two first return springs close to each other are respectively fixedly connected to the two side positioning frames, and the ends away from each other are respectively fixedly connected to the two scraping blades. A rotating mechanism is arranged on the lifting arm to drive the scraping blades to rotate clockwise and counterclockwise alternately. An expanding mechanism is arranged in the linkage frame to form a抵触 against the scraping blades, so that the scraping blades are in contact with the inner wall of the hydraulic classifier; The expanding mechanism includes a first threaded rod, which is threadedly installed in the linkage frame. A second servo motor is fixedly installed on the top of the linkage frame. The output shaft of the second servo motor is fixedly connected to the top end of the first threaded rod. A linkage block is threadedly installed on the first threaded rod. Push rods are hinged on both sides of the linkage block. One sides of the two push rods away from each other extend outside the linkage frame and are in contact with the corresponding scraping blades, and the two push rods are respectively movably connected to both sides of the linkage frame. Arc-shaped rod frames are fixedly installed on both sides of the linkage frame. Second return springs are sleeved on the two arc-shaped rod frames. One ends of the two second return springs close to each other are respectively fixedly connected to the outer walls of both sides of the linkage frame, and the ends away from each other are respectively fixedly connected to the two push rods. The push rod is in contact with the outer edge along the top of the movable opening; The rotating mechanism includes a curve groove, which is opened on the bearing shaft. A second rodless cylinder is fixedly installed on the top of the lifting arm. A guiding rod is fixedly installed on the slider of the second rodless cylinder. One end of the guiding rod extends into the curve groove and is in contact with the inner wall of the curve groove; Two positioning seats are fixedly installed on the inner walls of the multiple hydraulic classifiers, and the tops of the multiple positioning seats are provided with placement grooves. The sides of the two corresponding placement grooves close to each other are set as openings, and the inner walls of the two corresponding placement grooves away from each other are provided with third positioning grooves. Positioning mechanisms are provided on the multiple filter sleeves, and the multiple positioning mechanisms are adapted to the corresponding third positioning grooves.

2. The 3D printing sand grading device according to claim 1, characterized in that: Any one of the positioning mechanisms includes two rectangular frames, which are fixedly connected to the outer walls of both sides of the corresponding filter sleeves, stretching rods are slidably installed on the tops of the two rectangular frames, and hinged arms are rotatably installed on the bottom ends of the two stretching rods. The two hinged arms are hingedly connected to third positioning heads on the sides away from each other, and the sides of the two third positioning heads away from each other extend outside the two rectangular frames and are slidably connected to the corresponding rectangular frames, and the sides of the two third positioning heads away from each other are respectively inserted into the two third positioning grooves, and pull plates are fixedly installed on the tops of the two stretching rods. Reset springs are sleeved on the two stretching rods, and the tops of the two reset springs are respectively fixedly connected to the two pull plates, and the bottoms of the two reset springs are respectively fixedly connected to the tops of the two rectangular frames.

3. The 3D printing sand grading device according to claim 1, characterized in that: A first positioning groove is provided on the top of each of the guide slides, a backrest plate is fixedly installed on the top of the mounting base, a plurality of first telescopic cylinders are fixedly installed on one side of the backrest plate, a plurality of linkage plates are slidably installed on the backrest plate, the output shafts of the plurality of first telescopic cylinders are respectively fixedly connected to the plurality of linkage plates, a first positioning head is fixedly installed on the bottom of each of the linkage plates, and the bottom ends of the plurality of first positioning heads respectively extend into the plurality of first positioning grooves.

4. The 3D printing sand grading device according to claim 3, characterized in that: A plurality of guide slides are fixedly installed with retaining blocks on one side away from the hydraulic classifier, a second positioning groove is opened on the top of the plurality of retaining blocks, a concave mounting frame is fixedly installed on the top of the mounting base, a transverse screw is rotatably installed in the concave mounting frame, a transverse push seat is threadedly installed on the transverse screw, a transverse moving carrier is arranged above the concave mounting frame, two connecting bars are fixedly installed on the side of the transverse push seat close to the transverse moving carrier, the same direction sides of the two connecting bars are fixedly connected to the transverse moving carrier, and a third servo motor is fixedly installed on the outer wall of one side of the concave mounting frame Machine, the output shaft of the third servo motor is fixedly connected to the transverse screw, a plurality of through holes are opened on the transverse carrier plate, and the plurality of retaining blocks are respectively matched with the plurality of through holes, a plurality of first rodless cylinders are fixedly installed on the side of the transverse carrier plate away from the side frame plate, and the sliders of the plurality of first rodless cylinders are fixedly installed with connecting pieces, and the plurality of connecting pieces respectively penetrate the plurality of through holes and are movably connected with the transverse carrier plate, and a second positioning head is fixedly installed on the bottom of the plurality of connecting pieces, and the plurality of second positioning heads are respectively matched with the plurality of second positioning grooves.

5. The 3D printing sand grading device according to claim 1, characterized in that: A discharge hopper is fixedly mounted on the top of the mounting base, and the discharge hopper is located below the lowest hydraulic classifier.

6. The 3D printing sand grading device according to claim 2, characterized in that: The two stretching rods are fixedly sleeved with limit rings, the two limit rings are respectively located in the two rectangular frames, and limit rods are fixedly installed on the inner walls of the two rectangular frames on the side away from each other. Limit blocks are slidably installed on the two limit rods, and the tops of the two limit blocks are respectively fixedly connected to the two third positioning heads.

7. The 3D printing sand grading device according to claim 1, characterized in that: A storage barrel is provided above the hydraulic classifier located at the top, a discharge pipe is fixedly installed on one side of the storage barrel, a third rodless cylinder is fixedly installed on the outer wall of one side of the storage barrel, a sealing plate is fixedly installed on the slider of the third rodless cylinder, a block is fixedly installed on the side of the sealing plate away from the storage barrel, a connecting folding plate is fixedly installed on the storage barrel, a second threaded rod is threadedly installed on the connecting folding plate, a limiting plate is rotatably installed on the bottom end of the second threaded rod, and the limiting plate is adapted to the block.

8. The 3D printing sand grading device according to claim 7, characterized in that: A support column is fixedly installed on the top of the side frame plate, and the top of the support column is fixedly connected to the storage barrel. A horizontal platform is fixedly installed on the side of the support column away from the hydraulic classifier, and a second telescopic cylinder is fixedly installed on the bottom of the horizontal platform. The output shaft of the second telescopic cylinder passes through the horizontal platform and is slidably connected to the horizontal platform, and an impact plate is fixedly installed on the output shaft of the second telescopic cylinder.

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