Method and device for preparing high-collapsibility sodium silicate-bonded sand with optimized grain size distribution

Abstract

The invention discloses a method and a device for preparing high-collapsibility sodium silicate-bonded sand with optimized grain size distribution, and relates to the technical field of preparation of sodium silicate-bonded sand. Comprising the following steps: S1, raw sand selection: silica sand: selecting natural silica sand of which the SiO2 content is not lower than 98% as a main raw material; the particle size distribution meets the following requirements: the coarse particle part with the particle size range of 0.5-1.2 mm accounts for 30-40% of the total mass, the medium particle part with the particle size range of 0.2-0.5 mm accounts for 25-35% of the total mass, and the fine particle part with the particle size range of 0.1-0.2 mm accounts for 15-25% of the total mass. According to the preparation method of the high-collapsibility sodium silicate-bonded sand with optimized grain size distribution, the prepared sodium silicate-bonded sand has reasonable grain size distribution, good collapsibility and enough strength, can meet the high-quality requirement in casting production, effectively improves the surface quality and production efficiency of castings, and has good application prospects.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water glass sand preparation, and particularly relates to a high-splittable water glass sand preparation method and device with optimized particle size distribution. BACKGROUND

[0002] In the casting industry, water glass sand is widely used in the production of various castings due to its good bonding performance, certain strength, and low cost. However, the traditional water glass sand has poor collapsibility after pouring, which leads to difficult sand cleaning, increases the labor intensity of workers, and may affect the surface quality of the castings, thereby reducing the production efficiency. In addition, unreasonable particle size distribution makes it difficult for the performance of the water glass sand to reach the best state, further affecting its application effect in casting production.

[0003] Specifically, the traditional water glass sand has the following defects: Insufficient collapsibility: the sand mold is difficult to collapse by itself after pouring, and the sand cleaning process relies on mechanical impact or manual knocking, which not only increases the labor intensity, but also easily damages the surface precision of the castings, resulting in a decrease in the qualified rate of the castings.

[0004] Unreasonable particle size distribution: the existing technology lacks systematic optimization of the particle size distribution of silica sand, and the proportions of coarse, medium, and fine particles are unbalanced, which leads to a prominent contradiction between the strength and collapsibility of the sand mold - if high strength is pursued, the collapsibility will deteriorate, and vice versa.

[0005] Poor synergistic effect of additives: the proportions and mixing process of additives such as iron oxide powder and calcium oxide powder are not standardized, which affects the high-temperature stability and collapsibility efficiency of the water glass sand.

[0006] Therefore, there is an urgent need for a high-splittable water glass sand preparation scheme with optimized particle size distribution and strong synergistic effect of additives, and a precise and controllable proportioning device is needed for improvement. SUMMARY

[0007] The present application relates to the technical field of water glass sand preparation, and particularly relates to a high-splittable water glass sand preparation method and device with optimized particle size distribution.

[0008] To achieve the above-mentioned purpose, the present application adopts the following technical solutions: A high-splittable water glass sand preparation method with optimized particle size distribution, comprising the following steps: S1: raw sand selection: Silica sand: natural silica sand with SiO2 content not less than 98% is selected as the main raw material; the particle size distribution meets the following requirements: Coarse particle part, particle size range is 0.5-1.2mm, accounts for 30-40% of the total mass, The medium particle part has a particle size range of 0.2-0.5mm, and accounts for 25-35% of the total mass, The fine particle part has a particle size range of 0.1-0.2mm, and accounts for 15-25% of the total mass, The superfine particle part has a particle size less than 0.1mm, and accounts for 10-15% of the total mass. The additives include: preparing iron oxide powder, calcium oxide powder and organic ester type dispersant; wherein the adding amount of the iron oxide powder is 1-3% of the total mass of the raw sand, the adding amount of the calcium oxide powder is 0.5-2% of the total mass of the raw sand, and the adding amount of the organic ester type dispersant is 0.8-1.2% of the total mass of the raw sand. S2: raw material pretreatment: The selected silica sand is dried in a roller dryer; and the dried silica sand is screened through a vibrating screen. S3: premixing: Through a proportioning device, the materials are conveyed according to the designed particle size grading ratio, and the silica sand with different particle sizes is sequentially added to a sand mixer for dry mixing treatment. S4: adding a binder: The water glass is added to the running sand mixer, and mixed to make the water glass uniformly wrapped on the surface of the silica sand. S5: adding additives: The pre-weighed iron oxide powder, calcium oxide powder and organic ester type dispersant are sequentially added to the sand mixer, and fully mixed with the silica sand and water glass; and the mixing is continuously carried out. S6: humidity adjustment: The mixed water glass sand mixture is transferred to a humidity adjusting machine, and uniformly sprayed through a spraying device to control the humidity of the water glass sand at 3-5%. S7: material soaking treatment: After the humidity adjustment is completed, the water glass sand mixture is covered with plastic film or wet cloth, and is left for material soaking. S8: forming: The mold is selected; the water glass sand after the material soaking treatment is filled into the mold for processing and forming; and then hardening treatment is carried out. S9: demolding.

[0009] As a preferred embodiment of the present application, in S2, the silica sand is dried at a temperature of 200-250℃ for 3-5 hours to remove the water and impurities therein, so that the water content of the silica sand is controlled to be below 0.5%. In S4, the water glass is weighed, the modulus is 2.2-2.6, the density is 1.3-1.5g / cm 3 , and the adding amount is 4-6% of the total mass of the raw sand; the water glass is slowly added to the running sand mixer, and the mixing is continuously carried out for 10-15 minutes.

[0010] As a preferred of the present application: the demolding of S9 is specifically: After the hardening is completed, the demolding operation is performed after the mold is cooled to room temperature; the casting cavity and the sand core are taken out; the demolded mold is placed in an environment with good ventilation and appropriate humidity for natural curing; the curing time is 24-48 hours.

[0011] As a preferred of the present application: the proportioning device in S3 comprises: A mounting frame, wherein a material bin is mounted on the mounting frame; A cylindrical proportioning chamber, wherein a feeding port is arranged at the top of the cylindrical proportioning chamber, and a discharging port is arranged at the bottom of the cylindrical proportioning chamber, and the feeding port is in communication with the bottom of the material bin; the two cylindrical proportioning chambers are symmetrically arranged; A rotating disc, wherein the rotating disc is rotatably mounted on the inner wall of the cylindrical proportioning chamber, a blocking piece is fixed to one side of the outer wall of the rotating disc, and the blocking piece is in a fan-shaped structure matched with the inner part of the cylindrical proportioning chamber; A rotating rod, wherein the rotating rod is in a prism structure, the rotating rod is sealingly and slidingly arranged at the center of the two blocking pieces, and the rotating rod is in transmission connection with the other rotating rod through a connecting assembly after penetrating through the rotating disc to realize synchronous rotation; An end plate, wherein the end plate is fixed to the side of the rotating rod, the end plate is in a fan-shaped structure matched with the gap of the side of the two blocking pieces, an arc-shaped baffle is fixed to one side of the outer wall of the end plate, the distance between the end plate and the arc-shaped baffle and the rotating disc is synchronously changed based on the change of the horizontal position of the rotating rod, the rotating rod, the arc-shaped baffle and the rotating disc are matched to form a feeding cavity structure with adjustable volume, and the feeding cavity periodically passes through the feeding port and the discharging port based on the rotation of the rotating rod to realize the conveying of the material; A rotating driving part, wherein the rotating driving part is used for driving the rotating rod to rotate; A horizontal adjusting part, wherein the horizontal adjusting part is used for adjusting the horizontal position of the rotating rod.

[0012] As a preferred of the present application: the horizontal adjusting part is mounted on the mounting frame, a mounting seat is mounted on the horizontal adjusting part, the rotating driving part comprises a rotating driving motor, the rotating driving motor is mounted on the mounting seat, the output end of the rotating driving motor is in transmission connection with one rotating rod through a transmission gear set, a rotating block is mounted on one rotating rod, an annular groove is arranged in the middle of the rotating block, and the rotating block is rotatably mounted on the horizontal adjusting motor through the annular groove.

[0013] As a preferred of the present application: the horizontal adjusting part comprises: A horizontal adjusting motor, wherein the horizontal adjusting motor is mounted on the mounting frame, and the output end of the horizontal adjusting motor is in transmission connection with a threaded rod, and the threaded rod is in threaded connection with the inner wall of the mounting seat; A guide rod, wherein the guide rod is mounted on the mounting frame, and the mounting seat is slidingly connected to the outer wall of the guide rod.

[0014] As a preferred of the present application: the connecting assembly comprises: The sleeve is provided with a rotating column at one end, and the rotating column is rotatably arranged on the inner wall of the sleeve; The tooth column is arranged on the other end of the rotating column, and the outer wall of the tooth column is provided with uniformly distributed annular tooth grooves. The tooth seat is arranged on the hopper, and the middle part of the tooth seat is provided with a sliding channel. The moving frame is horizontally slidably arranged in the sliding channel of the tooth seat. The lifting tooth frame is slidably arranged on the outer wall of the moving frame, and the top of the lifting tooth frame is provided with second protrusions matched with the first protrusions. The connecting rod is fixed to the lifting tooth frame at the top, slidably arranged on the inner wall of the sleeve, and provided with an arc-shaped tooth plate matched with the annular tooth grooves at the bottom. The lifting driving structure is used to drive the lifting tooth frame to move up and down, and realize the meshing with the first protrusions or the annular tooth grooves. The moving frame is rotatably arranged on the outer wall of the moving frame, and the moving frame is rotatably arranged on the outer wall of the moving frame.

[0015] As a preferred embodiment of the present application, the lifting driving structure comprises: The annular air bag is arranged on the bottom of the moving frame, and the top of the annular air bag is arranged on the lifting tooth frame. The inflation and deflation device is connected with the annular air bag through the air pipe.

[0016] As a preferred embodiment of the present application, the connecting rod is slidably arranged on the outer wall of the rotating column, and the connecting rod is rotatably arranged on the outer wall of the rotating column.

[0017] As a preferred embodiment of the present application, the connecting rod is slidably arranged on the outer wall of the rotating column, and the connecting rod is rotatably arranged on the outer wall of the rotating column.

[0018] The present application has the following advantages: The present application has the following advantages: The prepared water glass sand has reasonable particle size distribution, good collapsibility and sufficient strength, can meet the high quality requirements in casting production, effectively improves the surface quality and production efficiency of the castings, and has good application prospect.

[0019] The application can realize the conveying of the material based on the rotation of the rotating rod, the periodic passing of the feeding cavity through the feeding port and the discharging port, and the change of the volume of the feeding cavity based on the change of the horizontal position of the rotating rod, and the adjustment of the proportioning based on the change of the horizontal position of the rotating rod due to the symmetrical arrangement of the end plates and the arc-shaped baffles in the two cylindrical proportioning chambers.

[0020] The application can realize the horizontal synchronous movement of the two rotating rods based on the work of the lifting driving structure, the up-down movement of the lifting tooth rack, the meshing of the arc-shaped tooth plate and the tooth column, or the horizontal movement of a single rotating rod based on the meshing of the first convex tooth and the second convex tooth, thereby more flexibly adjusting the proportioning.

[0021] The application can realize the horizontal synchronous movement of the two rotating rods based on the work of the lifting driving structure, the up-down movement of the lifting tooth rack, the meshing of the arc-shaped tooth plate and the tooth column, or the horizontal movement of a single rotating rod based on the meshing of the first convex tooth and the second convex tooth, thereby more flexibly adjusting the proportioning.

[0022] The application can realize the horizontal synchronous movement of the two rotating rods based on the work of the lifting driving structure, the up-down movement of the lifting tooth rack, the meshing of the arc-shaped tooth plate and the tooth column, or the horizontal movement of a single rotating rod based on the meshing of the first convex tooth and the second convex tooth, thereby more flexibly adjusting the proportioning.

[0023] The application can realize the horizontal synchronous movement of the two rotating rods based on the work of the lifting driving structure, the up-down movement of the lifting tooth rack, the meshing of the arc-shaped tooth plate and the tooth column, or the horizontal movement of a single rotating rod based on the meshing of the first convex tooth and the second convex tooth, thereby more flexibly adjusting the proportioning. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A structure schematic view of a high-splashing water glass sand preparation device for optimizing particle size gradation is provided in the application; Figure 2 A structure schematic view of the cooperation of two cylindrical proportioning chambers of a high-splashing water glass sand preparation device for optimizing particle size gradation is provided in the application; Figure 3 A structure schematic view of the cooperation of two rotating rods of a high-splashing water glass sand preparation device for optimizing particle size gradation is provided in the application; Figure 4 A structure schematic view of a moving frame and a lifting tooth rack of a high-splashing water glass sand preparation device for optimizing particle size gradation is provided in the application; Figure 5 A structure schematic view of a sleeve of a high-splashing water glass sand preparation device for optimizing particle size gradation is provided in the application; Figure 6This is a schematic diagram of the internal structure of the cylindrical batching chamber of a high-disintegrability water glass sand preparation device with optimized particle size distribution proposed by the present invention; Figure 7 This is a structural schematic diagram of a high-disintegrability water glass sand preparation device with optimized particle size distribution proposed by the present invention, in which the backing plate is removed from between the movable plate and the end plate; Figure 8 This is a structural schematic diagram of the connecting strips of a high-disintegrability water glass sand preparation device with optimized particle size distribution proposed by the present invention.

[0025] In the figure: 1 mounting frame, 2 curved side door, 3 cylindrical batching chamber, 4 rotating rod, 5 silo, 6 transmission gear set, 7 rotation drive motor, 8 threaded rod, 9 guide rod, 10 mounting seat, 11 translation adjustment motor, 12 inflation and deflation device, 13 mounting plate, 14 spring, 15 slide plate, 16 air pipe, 17 movable plate, 18 pad, 19 gear seat, 20 movable frame, 21 connecting card strip, 22 curved baffle, 23 annular airbag, 24 gear column, 25 rotating column, 26 sleeve, 27 roller, 28 lifting gear frame, 29 connecting rod, 30 transmission prism, 31 curved gear plate, 32 turntable, 33 block, 34 end plate, 35 slot, 36 groove. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be further described in detail below in conjunction with specific implementation methods.

[0027] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0028] Example: A method and device for preparing high-disintegrability water glass sand with optimized particle size distribution, such as Figure 1 As shown, including: S1: Raw sand selection: Silica sand: Natural silica sand with a SiO2 content of not less than 98% is selected as the main raw material; its particle size distribution meets the following requirements: the coarse particle part (particle size range is 0.5-1.2mm) accounts for 30-40% of the total mass, the medium particle part (particle size range is 0.2-0.5mm) accounts for 25-35% of the total mass, the fine particle part (particle size range is 0.1-0.2mm) accounts for 15-25% of the total mass, and the ultrafine particle part (particle size less than 0.1mm) accounts for 10-15% of the total mass; Additives: Prepare iron oxide powder (Fe2O3 content not less than 95%), calcium oxide powder (CaO content not less than 97%) and organic ester type dispersant (dimethyl adipate); wherein, the addition amount of iron oxide powder is 1-3% of the total mass of the original sand, the addition amount of calcium oxide powder is 0.5-2% of the total mass of the original sand, and the addition amount of organic ester type dispersant is 0.8-1.2% of the total mass of the original sand; S2: Raw material pretreatment: Put the selected silica sand into the drum dryer, dry it at a temperature of 200-250℃ for 3-5 hours to remove water and impurities, and control the water content of the silica sand to be below 0.5%; screen the dried silica sand through a vibrating screen, and collect and store silica sand of different particle sizes according to the above particle size requirements to ensure the accuracy of each particle size grading; S3: Premixing: Through the proportioning device, the material is conveyed according to the designed particle size grading ratio, and the silica sand of different particle sizes is sequentially added to the sand mixer, and the silica sand of various particle sizes is preliminarily mixed uniformly for 5-10 minutes; S4: Adding binder: Weigh an appropriate amount of water glass (modulus is 2.2-2.6, density is 1.3-1.5 g / cm 3 ), and the addition amount is 4-6% of the total mass of the original sand; slowly add the water glass into the running sand mixer, and continue to mix for 10-15 minutes to make the water glass uniformly wrap on the surface of the silica sand; S5: Adding additives: The pre-weighed iron oxide powder, calcium oxide powder and organic ester type dispersant are sequentially added to the sand mixer and fully mixed with the silica sand and water glass; continue to mix for 15-20 minutes to ensure that the additives are uniformly dispersed in the mixture, and obtain a uniform water glass sand mixture; S6: Humidity adjustment: Transfer the mixed water glass sand mixture to the humidity adjusting machine, and uniformly spray an appropriate amount of water on the mixture through the spraying device to control the humidity of the water glass sand to be 3-5%; during the humidity adjustment process, the mixture should be constantly stirred to ensure uniform humidity; S7: Steaming treatment: After the humidity adjustment is completed, cover the water glass sand mixture with plastic film or wet cloth, and let it stand for 1-2 hours to make the water in the water glass sand further diffuse uniformly, and at the same time, promote the interaction between the additives and the silica sand and water glass, and improve the performance of the water glass sand; S8: Molding: According to the shape and size requirements of the casting, select appropriate molding process and mold; fill the steamed water glass sand into the mold, and use vibration, compaction and other methods to make it compact and form the required cavity and sand core; Put the shaped water glass sand mold cavity and sand core into the hardening chamber, and pass in carbon dioxide gas (CO2 content is not less than 98%, flow rate is 100-150 L / min) to perform hardening treatment; the hardening time is 30-60 minutes, so that the water glass sand is rapidly gelled and hardened under the action of carbon dioxide to form a casting mold with certain strength; S9: demolding: After hardening is completed, the demolding operation is performed after the casting mold is cooled to room temperature; the casting mold cavity and sand core are carefully taken out to avoid damaging the casting mold; The demolded casting mold is placed in an environment with good ventilation and appropriate humidity for natural curing; the curing time is 24-48 hours, so that the strength of the water glass sand is further improved, and the collapsibility is not affected.

[0029] In order to better match, for example Figures 1-8 As shown in the matching device in S3, comprising: A mounting frame 1, a hopper 5 is installed on the mounting frame 1; A cylindrical dosing chamber 3, the top of the cylindrical dosing chamber 3 is provided with a feeding port, and the bottom of the cylindrical dosing chamber 3 is provided with a discharging port; the feeding port is in communication with the bottom of the hopper 5; two cylindrical dosing chambers 3 are symmetrically arranged; A turntable 32, the turntable 32 is rotatably installed on the inner wall of the cylindrical dosing chamber 3, and a stop block 33 is fixed to one side of the outer wall of the turntable 32; the stop block 33 is in a fan-shaped structure matched with the inside of the cylindrical dosing chamber 3; A rotating rod 4, the rotating rod 4 is in a prism structure, and the rotating rod 4 is sealingly and slidingly located at the center of the two stop blocks 33; the rotating rod 4 penetrates through the turntable 32 and is in transmission connection with the other rotating rod 4 through a connecting assembly to realize synchronous rotation; An end plate 34, the end plate 34 is fixed to the side of the rotating rod 4, and the end plate 34 is in a fan-shaped structure matched with the gap on the side of the two stop blocks 33; an arc-shaped baffle 22 is fixed to one side of the outer wall of the end plate 34; based on the change of the horizontal position of the rotating rod 4, the distance between the end plate 34 and the arc-shaped baffle 22 and the turntable 32 changes synchronously; the rotating rod 4, the arc-shaped baffle 22 and the turntable 32 cooperate to form a feeding cavity structure with adjustable volume; based on the rotation of the rotating rod 4, the feeding cavity periodically passes through the feeding port and the discharging port to realize the conveying of the material; A rotating driving part, the rotating driving part is used to drive the rotating rod 4 to rotate; A horizontal adjusting part, the horizontal adjusting part is used to adjust the horizontal position of the rotating rod 4; Through setting the cylindrical dosing chamber 3, and the symmetrical end plate 34, the arc-shaped baffle 22 and other structures, the feeding cavity can periodically pass through the feeding port and the discharging port based on the rotation of the rotating rod 4, the conveying of the material is realized, and the volume of the feeding cavity changes based on the change of the horizontal position of the rotating rod 4, and the volume of one feeding cavity increases and the volume of the other feeding cavity decreases due to the symmetrical arrangement of the end plate 34 and the arc-shaped baffle 22 in the two cylindrical dosing chambers 3, so that the adjustment of the proportioning is realized based on the change of the horizontal position of the rotating rod 4.

[0030] In order to facilitate the rotation of the driving structure, as shown in Figure 1 The horizontal adjustment part is installed on the mounting frame 1, and the mounting seat 10 is installed on the horizontal adjustment part; the rotating driving part comprises a rotating driving motor 7, the rotating driving motor 7 is installed on the mounting seat 10, and the output end of the rotating driving motor 7 is in transmission connection with one rotating rod 4 through a transmission gear set 6; the rotating block is installed on one rotating rod 4, the middle part of the rotating block is provided with an annular groove, and the rotating block is rotatably installed on the translation adjustment motor 11 through the annular groove.

[0031] In order to facilitate the adjustment of the horizontal position of the structure, as shown in Figure 1 The horizontal adjustment part comprises: The translation adjustment motor 11 is installed on the mounting frame 1, the output end of the translation adjustment motor 11 is in transmission connection with the threaded rod 8, and the threaded rod 8 is in threaded connection with the inner wall of the mounting seat 10; The guide rod 9 is installed on the mounting frame 1, and the mounting seat 10 is slidably connected to the outer wall of the guide rod 9; Through the horizontal adjustment part and the rotating driving part, the mounting seat 10 can be driven to move in translation based on the working of the translation adjustment motor 11, and then the rotating driving motor 7 and the rotating rod 4 are synchronously moved, and the rotating rod 4 is driven to rotate through the transmission gear set 6 based on the working of the rotating driving motor 7.

[0032] In order to facilitate the adjustment of the transmission relationship between the two rotating rods 4, as shown in Figures 3-5 The connecting assembly comprises: The sleeve 26 is installed on one end of the inner wall of the sleeve 26, and the rotating column 25 is rotatably installed on one end of the inner wall of the sleeve 26; The tooth column 24 is installed on the end of the other rotating rod 4, the circumferential outer wall of the tooth column 24 is provided with uniformly distributed annular tooth grooves, the transmission prism 30 is installed on one end of the tooth column 24, and the transmission prism 30 is slidably connected to the inner wall of the rotating column 25; The tooth seat 19 is installed on the hopper 5, the middle part of the tooth seat 19 is provided with a sliding channel, and the bottom surface of the tooth seat 19 is provided with uniformly distributed first convex teeth; The moving frame 20 is horizontally slidably arranged in the sliding channel of the tooth seat 19; Lifting rack 28, lifting rack 28 up and down sliding on the outer wall of the moving frame 20, the top of the lifting rack 28 is provided with the second convex tooth matched with the first convex tooth; Connecting rod 29, connecting rod 29 top fixed on the lifting rack 28, connecting rod 29 up and down sliding in the inner wall of the sleeve 26, the bottom of the connecting rod 29 is fixed with the arc-shaped tooth plate 31 matched with the annular tooth groove; Lifting drive structure, lifting drive structure for driving lifting rack 28 up and down movement, realize with the first convex tooth or annular tooth groove meshing; By setting the connecting assembly, can be based on the work of lifting drive structure, driving lifting rack 28 up and down movement, and then control arc-shaped tooth plate 31 and tooth column 24 meshing to realize the horizontal synchronous movement of two rotating rod 4, or control the first convex tooth and the second convex tooth meshing, realize the horizontal movement of single rotating rod 4, so as to adjust the ratio more flexible.

[0033] In order to improve the motion fluency; as Figure 4 As shown, the moving frame 20 is rotatably installed with the roller 27, the roller 27 rolls in the slide of the tooth seat 19, the moving frame 20 is installed with the limiting block, the limiting block slides on both sides of the tooth seat 19.

[0034] In order to facilitate the control of lifting rack 28 movement; as Figure 1 、 Figure 3 As shown, the lifting drive structure comprises: Annular air bag 23, annular air bag 23 bottom installed on the bottom of the moving frame 20, annular air bag 23 top installed on the lifting rack 28, annular air bag 23 is provided with a plurality of wrinkles beneficial to deformation; Charging and discharging device 12, charging and discharging device 12 is connected with annular air bag 23 through air pipe 16; Through the setting of annular air bag 23, charging and discharging device 12 and other structures, can be through the way of annular air bag 23 charging and discharging, prompting annular air bag 23 deformation, and then achieve the purpose of adjusting the position of lifting rack 28.

[0035] In order to adjust the single feeding amount more flexible; as Figure 2 、 Figure 7 、 Figure 8 As shown, the outer wall of the rotating rod 4 is slidably connected with the sliding plate 15, the rotating rod 4 is installed with the mounting plate 13, the spring 14 is installed between the mounting plate 13 and the sliding plate 15, the outer wall of one side of the sliding plate 15 is fixed with the connecting clamping strip 21, the connecting clamping strip 21 is slidably connected on the side of the end plate 34, the connecting clamping strip 21 is connected with the movable plate 17 after penetrating through the end plate 34, the movable plate 17 and the end plate 34 are detachably installed with the pad plate 18; the side of the pad plate 18 is provided with a clamping groove 35, the shape of the clamping groove 35 is matched with the connecting clamping strip 21; By providing structures such as the movable plate 17 and the pad 18 , a corresponding number of pads 18 can be installed between the end plate 34 and the movable plate 17 , thereby achieving the purpose of adjusting the volume and further improving the flexibility of adjustment.

[0036] In order to facilitate disassembly and assembly; Figure 7 、 Figure 8 As shown, the connecting clip 21 is provided with a groove 36, and the distance between the adjacent sides of the two grooves 36 is greater than the distance between the two slots 35 on the side close to the rotating rod 4; one side of the cylindrical batching chamber 3 is hingedly connected to a curved side door 2 that matches the shape of the cylindrical batching chamber 3; By providing the groove 36 , the movable plate 17 can be pulled toward the turntable 32 during assembly and disassembly, so that the groove 36 reaches the side of the end plate 34 close to the movable plate 17 , thereby enabling the pad 18 to be assembled and disassembled through the position of the groove 36 , thereby improving practicality.

[0037] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A method for preparing highly disintegrating water glass sand with optimized particle size distribution, characterized in that: The steps include: S1: Raw sand selection: Silica sand: Natural silica sand with SiO2 content not less than 98% is selected as the main raw material; its particle size distribution meets the following requirements: The coarse particles have a particle size range of 0.5-1.2 mm and account for 30-40% of the total mass. The medium particle size ranges from 0.2 to 0.5 mm, accounting for 25-35% of the total mass. The fine particles have a particle size range of 0.1-0.2 mm and account for 15-25% of the total mass. The ultrafine particle fraction has a particle size of less than 0.1 mm and accounts for 10-15% of the total mass; Additives: prepare iron oxide powder, calcium oxide powder and organic ester disintegrator; the amount of iron oxide powder added is 1-3% of the total mass of the raw sand, the amount of calcium oxide powder added is 0.5-2% of the total mass of the raw sand, and the amount of organic ester disintegrator added is 0.8-1.2% of the total mass of the raw sand; S2: Raw material pretreatment: The selected silica sand is placed in a drum dryer for drying; the dried silica sand is screened through a vibrating screen; S3: Premix: Through the proportioning device, the material is transported according to the designed particle size ratio, and silica sand of different particle sizes is added to the sand mixer in sequence for dry mixing; S4: Adding binder: Add water glass into the running sand mixer and mix it so that the water glass is evenly wrapped on the surface of the silica sand; S5: Add additives: Add the pre-weighed iron oxide powder, calcium oxide powder and organic ester disintegrator into the sand mixer in sequence, and mix thoroughly with silica sand and water glass; continue mixing; S6: Humidity Control: Transfer the mixed water glass sand mixture to the humidity control machine and spray it evenly through the spray device to control the humidity of the water glass sand at 3-5%; S7: Stuffing treatment: After the moisture adjustment is completed, cover the water glass sand mixture with plastic film or wet cloth and let it stand; S8: Molding: Select a mold; fill the mold with the water glass sand after the stuffing treatment and process it into shape; then perform hardening treatment; S9: Demolding.

2. The method for preparing high-disintegrability water glass sand with optimized particle size distribution according to claim 1, wherein: In S2, drying the silica sand at a temperature of 200-250° C. for 3-5 hours to remove moisture and impurities, so that the moisture content of the silica sand is controlled below 0.5%; In the S4, water glass is weighed, the modulus is 2.2-2.6, and the density is 1.3-1.5 g / cm 3 The amount of water glass added is 4-6% of the total mass of the original sand; slowly add the water glass into the running sand mixer and continue mixing for 10-15 minutes.

3. The method for preparing high-disintegrability water glass sand with optimized particle size distribution according to claim 1, wherein: The proportioning device in S3 includes: A mounting frame (1), wherein a silo (5) is mounted on the mounting frame (1); A cylindrical batching chamber (3) is provided with a feed port at the top of the cylindrical batching chamber (3), and a discharge port is provided at the bottom of the cylindrical batching chamber (3), and the feed port is connected to the bottom of the silo (5); the two cylindrical batching chambers (3) are symmetrically arranged; A turntable (32) is rotatably mounted on the inner wall of the cylindrical batching chamber (3), and a stopper (33) is fixed to the outer wall of one side of the turntable (32), and the stopper (33) is in a fan-shaped structure adapted to the interior of the cylindrical batching chamber (3); The rotating rod (4) is a prismatic structure. The rotating rod (4) is sealed and slides at the center position of the two stoppers (33). After the rotating rod (4) passes through the turntable (32), it is connected to the other rotating rod (4) through a connecting assembly to achieve synchronous rotation. The end plate (34) is fixed to the side of the rotating rod (4), and the end plate (34) is formed into a fan-shaped structure that is adapted to the side gaps of the two stoppers (33). An arc-shaped baffle (22) is fixed to the outer wall of one side of the end plate (34). Based on the change of the horizontal position of the rotating rod (4), the spacing between the end plate (34) and the arc-shaped baffle (22) and the rotating disk (32) changes synchronously. The rotating rod (4), the arc-shaped baffle (22) and the rotating disk (32) cooperate to form a feeding cavity structure with adjustable volume. Based on the rotation of the rotating rod (4), the feeding cavity periodically passes through the feed port and the discharge port to realize the transportation of materials. A rotation drive unit, the rotation drive unit is used to drive the rotating rod (4) to rotate; The horizontal adjustment part is used to adjust the horizontal position of the rotating rod (4).

4. The method for preparing high-disintegrability water glass sand with optimized particle size distribution according to claim 3, wherein: The horizontal adjustment part is mounted on the mounting frame (1), and a mounting seat (10) is mounted on the horizontal adjustment part; the rotation drive part includes a rotation drive motor (7), the rotation drive motor (7) is mounted on the mounting seat (10), and the output end of the rotation drive motor (7) is connected to a rotating rod (4) through a transmission gear set (6); a rotating block is mounted on the rotating rod (4), and an annular groove is provided in the middle of the rotating block. The rotating block can be rotatably mounted on the translation adjustment motor (11) through the annular groove.

5. The method for preparing high-disintegrability water glass sand with optimized particle size distribution according to claim 4, wherein: The level adjustment unit includes: A translation adjustment motor (11), the translation adjustment motor (11) is mounted on the mounting frame (1), the output end of the translation adjustment motor (11) is transmission-connected to a threaded rod (8), and the threaded rod (8) is connected to the inner wall of the mounting seat (10) through a thread; The guide rod (9) is mounted on the mounting frame (1), and the mounting seat (10) is slidably connected to the outer wall of the guide rod (9).

6. The method for preparing high-disintegrability water glass sand with optimized particle size distribution according to claim 3, wherein: The connection component includes: A sleeve (26), a rotating rod (4) is provided with a rotating column (25) at the end thereof, and the rotating column (25) is rotatably mounted on the inner wall of one end of the sleeve (26); A tooth column (24) is mounted on the end of the other rotating rod (4), and an annular tooth groove is evenly distributed on the outer circumferential wall of the tooth column (24). A transmission prism (30) is mounted on one end of the tooth column (24), and the transmission prism (30) is slidably connected to the inner wall of the rotating column (25); A tooth seat (19), the tooth seat (19) is mounted on the silo (5), a slideway is provided in the middle of the tooth seat (19), and a first convex tooth is evenly distributed on the bottom surface of the tooth seat (19); A movable frame (20), the movable frame (20) slides horizontally in a slideway of the gear seat (19); A lifting gear rack (28), the lifting gear rack (28) slides up and down on the outer wall of the movable rack (20), and a second convex tooth adapted to the first convex tooth is provided on the top of the lifting gear rack (28); A connecting rod (29), the top of the connecting rod (29) is fixed on the lifting gear frame (28), the connecting rod (29) slides up and down on the inner wall of the sleeve (26), and the bottom of the connecting rod (29) is fixed with an arc-shaped tooth plate (31) adapted to the annular tooth groove; A lifting drive structure, the lifting drive structure is used to drive the lifting gear rack (28) to move up and down to achieve engagement with the first convex tooth or the annular tooth groove; A roller (27) is rotatably mounted on the movable frame (20), and the roller (27) rolls in a slideway of the tooth seat (19). A limit block is mounted on the movable frame (20), and the limit block slides on both sides of the tooth seat (19).

7. The method for preparing high-disintegrability water glass sand with optimized particle size distribution according to claim 6, wherein: The lifting drive structure includes: An annular airbag (23), wherein the bottom of the annular airbag (23) is mounted on the bottom of the movable frame (20), and the top of the annular airbag (23) is mounted on the lifting gear frame (28), and the annular airbag (23) is provided with a plurality of wrinkles that facilitate deformation; The inflation and deflation device (12) is connected to the annular airbag (23) via an air pipe (16).

8. The method for preparing high-disintegrability water glass sand with optimized particle size distribution according to claim 7, wherein: The outer wall of the rotating rod (4) is slidably connected to a slide plate (15), a mounting plate (13) is installed on the rotating rod (4), a spring (14) is installed between the mounting plate (13) and the slide plate (15), a connecting clip (21) is fixed to the outer wall of one side of the slide plate (15), the connecting clip (21) is slidably connected to the side of the end plate (34), the connecting clip (21) passes through the end plate (34) and is connected to a movable plate (17), a pad (18) is detachably installed between the movable plate (17) and the end plate (34); a slot (35) is provided on the side of the pad (18), and the shape of the slot (35) is adapted to the connecting clip (21).

9. The method for preparing high-disintegrability water glass sand with optimized particle size distribution according to claim 8, wherein: The connecting clamping strip (21) is provided with a groove (36), and the distance between the adjacent sides of the two grooves (36) is greater than the distance between the two clamping slots (35) on the side close to the rotating rod (4); and a curved side door (2) adapted to the shape of the cylindrical batching chamber (3) is hingedly connected to one side of the cylindrical batching chamber (3).

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