A screening device for molding sand for butterfly valve casting

Abstract

The present invention relates to the technical field of foundry sand processing devices, and specifically to a screening device for molding sand for butterfly valve casting, comprising a buffer tank and a base, wherein a filter tank is fixedly connected to the upper end of the base, a first motor is installed on the outer side of the filter tank, a filtering mechanism for screening molding sand is provided on the inner side of the filter tank, a conveyor belt is installed on the upper end of the base, and a feeding mechanism for uniformly discharging molding sand is installed on the upper end of the conveyor belt. For nuclear power butterfly valves, radioactive impurities in molding sand are reduced by combining visual recognition and magnetic separation to meet the casting standards of nuclear first-level components. The 1.5mm chamfered circular holes and inclined guide grooves of the punched cone can accurately remove sintered sand blocks with a size greater than 1.5mm to prevent them from clogging subsequent screens or causing uneven sand mold strength. The 0.8mm aperture of the woven mesh is combined with the arc-edge sleeve for vibration and anti-blocking to achieve coarse sand grading of silica sand, thereby solving the problem of insufficient air permeability caused by agglomeration of fine powder in traditional screening.

Description

Technical Field

[0001] The invention relates to the technical field of foundry sand processing, in particular to a screening device for molding sand used for butterfly valve casting. Background Art

[0002] As a core component for fluid control, the casting quality of butterfly valves directly affects the safe operation of key sectors such as energy and chemical industry. In the fields of nuclear power, high temperature and high pressure, and environmental regeneration, higher requirements are placed on the screening of molding sand.

[0003] Nuclear-grade butterfly valves require a metal impurity content of ≤0.05% in the molding sand. Traditional manual visual inspection cannot meet this precision requirement. Furthermore, sintered sand lumps larger than 1.5mm can easily clog the screen, resulting in uneven strength in the sand mold and potentially causing serious accidents such as valve body leakage. Traditional vibrating screens can only screen coarse sand lumps larger than 2mm through their apertures, with a 15% under-screening rate for sintered sand lumps 1.5-2mm. Furthermore, they cannot distinguish the morphological differences between radioactive metal impurities and specialty aggregates. Removing impurities from nuclear-grade molding sand relies on costly and inefficient offline testing. Butterfly valves designed to withstand temperatures exceeding 1000°C require specialty aggregates such as zircon sand and chromite sand, which have a particle surface charge density as high as 20nC / g. Traditional screens suffer from electrostatic agglomeration, reducing the screening rate by over 30%. Furthermore, impurities such as titanium dioxide, which resemble aggregates in appearance, are difficult to distinguish manually and can easily cause sand sticking and thermal cracking in castings. Therefore, we propose a screening device for molding sand used in butterfly valve castings. Summary of the Invention

[0004] In order to remedy the deficiencies of the prior art and solve at least one of the technical problems raised in the background art, the present invention provides a screening device for molding sand for butterfly valve casting.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a screening device for molding sand for butterfly valve casting, comprising a base, a filter tank is fixedly connected to the upper end of the base, a first motor is installed on the outside of the filter tank, a filtering mechanism for screening molding sand is provided on the inside of the filter tank, a conveyor belt is installed on the upper end of the base, and a unloading mechanism for evenly discharging molding sand is installed on the upper end of the conveyor belt.

[0006] Preferably, the filtering mechanism includes a block removal component for removing sintered sand blocks, and the filtering mechanism also includes a classification component for achieving coarse sand classification.

[0007] Preferably, the picking block assembly includes a second motor installed at the upper end of the filter tank, the output shaft of the second motor is fixedly connected to the first auger rod, the outer side of the first auger rod is rotatably connected to the feeding sleeve, the lower end of the feeding sleeve is fixedly connected to the punching cone through a connecting rod, the punching cone is rotatably connected to the inner side of the filter tank, the filtering hole of the punching cone is a 1.5mm round hole, the round hole is chamfered, and the inner wall of the punching cone is provided with an inclined guide groove.

[0008] Preferably, four groups of discharge pipes are fixedly connected to the outside of the feeding sleeve, the inner walls of the discharge pipes are provided with a Teflon coating, the outer sides of the discharge pipes pass through the punching cone, and the other end of the discharge pipes is fixedly connected to a collecting box, and the inner wall of the collecting box is fixedly connected to the punching cone.

[0009] Preferably, the outer side of the output shaft of the second motor is fixedly connected to a first spur gear, the outer side of the first spur gear is meshedly connected to a first chain, the inner side of the first chain is meshedly connected to a second spur gear, the lower end of the second spur gear is fixedly connected to a third spur gear through a rotating shaft, the outer side of the third spur gear is meshedly connected to an inner gear ring, and the lower end of the inner gear ring is fixedly connected to the punching cone.

[0010] Preferably, the classification component includes a connecting rod fixedly connected to the first auger rod, the lower end of the connecting rod is fixedly connected to the first bevel gear, the outer side of the first bevel gear is meshed with two groups of symmetrical second bevel gears, the two groups of second bevel gears are fixedly connected to the ends away from each other with an airflow tube, the outer side of the airflow tube is rotatably connected to the filter tank, the other end of the airflow tube is rotatably connected to the input port of the air pump, multiple groups of linear array cameras are installed on the outer side of the airflow tube, and two groups of symmetrical electromagnetic exhaust heads are installed on the outer side of the airflow tube.

[0011] Preferably, the outer side of the airflow tube is fixedly connected to an arc-edge sleeve, and the outer side of the arc-edge sleeve is rotatably connected to a pressure block, the upper end of one of the two groups of pressure blocks is concave, and the upper end of the other group of pressure blocks is convex, and the lower ends of the two groups of pressure blocks are commonly fixedly connected to a woven mesh, and the woven mesh is rotatably connected to the inner side of the filter tank through a rotating shaft.

[0012] Preferably, the woven mesh is blade-shaped, the woven mesh is made of stainless steel, the stainless steel wire diameter of the woven mesh is 0.4 mm, the upper end of the woven mesh is rotatably connected to the second auger rod, one end of the second auger rod is fixedly connected to a spherical connecting block, the spherical connecting block is rotatably connected to the inner side of the filter tank, the outer side of the spherical connecting block is fixedly connected to the output shaft of the first motor, the inner side of the filter tank is fixedly connected to a conductive screen, the surface of the conductive screen is coated with an ITO conductive film, and a collection hopper is fixedly connected to the bottom of the conductive screen inside the filter tank.

[0013] Preferably, the unloading mechanism includes a fourth spur gear fixedly connected to the first motor output shaft, the outer side of the fourth spur gear is meshed with the second chain, the inner side of the second chain is meshed with the fifth spur gear, one end of the fifth spur gear is fixedly connected to a threaded rod, both ends of the threaded rod are rotatably connected to the mounting bracket by a rotating shaft, the lower end of the mounting bracket is fixedly connected to the conveyor belt, the outer side of the threaded rod is threadedly connected to the mounting block, the mounting block is convex in design, an electric ceramic vibrator is installed inside the mounting block, the upper end of the mounting block is slidably connected to the mounting bracket, the inner side of the mounting block is fixedly connected to a unloading pipe, one end of the unloading pipe is fixedly connected to the collecting hopper, the front end of the mounting block is fixedly connected to an adsorption hose, the outer side of the adsorption hose is fixedly connected to an adsorption tank, a polyurethane screen is provided inside the adsorption tank, the other end of the adsorption hose is fixedly connected to the input port of the air pump, and a laser particle size analyzer is installed at the lower end of the mounting block.

[0014] Preferably, the other end of the threaded rod is fixedly connected to the third bevel gear, the outer side of the third bevel gear is meshedly connected to the fourth bevel gear, the front end of the fourth bevel gear is rotatably connected to the adhesive box, the lower end of the adhesive box is fixedly connected to the base, the inner side of the adhesive box is rotatably connected to the heating stirring rod, the rear end of the heating stirring rod is fixedly connected to the fourth bevel gear, and a solenoid valve spray pipe is installed on one side of the adhesive box.

[0015] Compared with the prior art, the present invention provides a device for screening molding sand for butterfly valve casting, which has the following beneficial effects:

[0016] 1. To address radioactive impurities in the molding sand of nuclear power butterfly valves, visual identification is used to reduce the metal impurity content to meet the casting standards for nuclear first-level components. The 1.5mm chamfered circular holes and inclined guide grooves of the punching cone can accurately remove sintered sand lumps larger than 1.5mm to prevent them from clogging subsequent screens or causing uneven sand mold strength. The 0.8mm aperture of the woven mesh, combined with the vibration anti-blocking of the arc-edge sleeve, achieves coarse sand classification of silica sand, solving the problem of insufficient air permeability caused by fine powder agglomeration in traditional screening, controlling the air permeability of silica sand molding sand, and meeting the stringent requirements for sand mold surface roughness in the sealing area of ​​the butterfly valve body. The shear force generated by the speed difference between the auger rod and the cone breaks up lightly agglomerated molding sand, promotes the molding sand to adhere to the cylinder wall, accelerates the passage of fine particles through the sieve holes, achieves efficient separation of oversized particles, and increases the proportion of effective particles in subsequent screening.

[0017] 2. The conductive screen surface cooperates with the airflow of the airflow tube to eliminate the static electricity generated by the friction of the zircon sand particles, avoid the reduction of the screening rate due to agglomeration, and greatly increase the effective particle ratio of zircon sand molding sand. The linear array camera is combined with the deep learning algorithm to identify zircon sand and titanium dioxide and other impurities with similar appearance in real time. The electromagnetic exhaust head accurately removes abnormal particles, solving the industry problem that traditional screening cannot distinguish between special aggregates and impurities. It ensures the refractoriness and anti-sand sticking performance of the molding sand for high-temperature butterfly valves and avoids sand sticking and crack defects in castings caused by impurities entering the sand mold.

[0018] 3. The adsorption hose and polyurethane screen capture fine powder <0.2mm and broken resin film. Combined with the constant temperature treatment of the binder by the heated stirring rod, the burning loss of the regenerated sand is ≤3%, the acid consumption value is ≤5mL, and the reuse rate is improved. The laser particle size analyzer detects the specific surface area in real time, and the solenoid valve spray pipe is linked to dynamically adjust the amount of resin added to solve the problem of binder ratio imbalance caused by changes in the morphology of regenerated sand particles, and significantly reduce the cracking rate and pore defect rate of the butterfly valve sand core. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention;

[0021] Figure 3 It is a schematic cross-sectional view of the overall structure of the filtering mechanism of the present invention;

[0022] Figure 4 This is a schematic diagram of the overall structure of the block removal assembly of the present invention;

[0023] Figure 5 It is a schematic cross-sectional view of the overall structure of the pick block assembly of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of the classification components of the present invention;

[0025] Figure 7 For the present invention Figure 6 A schematic diagram of the structure of part A in the middle;

[0026] Figure 8 For the present invention Figure 6 A magnified schematic diagram of the structure of part B;

[0027] Figure 9 It is a schematic cross-sectional view of the overall structure of the blanking mechanism of the present invention.

[0028] In the figure: 1, base; 2, filter tank; 3, first motor; 4, filter mechanism; 41, pick block assembly; 411, second motor; 412, first auger rod; 413, feed sleeve; 414, punching cone; 415, discharge pipe; 416, collection box; 417, first spur gear; 418, first chain; 419, second spur gear; 4110, third spur gear; 4111, inner gear ring; 42, classification assembly; 421, connecting rod; 422, first bevel gear; 423, second bevel gear; 424, air flow pipe; 425, arc-edge sleeve; 426, Pressing block; 427, linear array camera; 428, electromagnetic exhaust head; 429, woven mesh; 4210, second auger rod; 4211, spherical connecting block; 4212, conductive screen; 4213, collecting hopper; 5, unloading mechanism; 51, fourth spur gear; 52, second chain; 53, fifth spur gear; 54, threaded rod; 55, mounting block; 56, unloading pipe; 57, mounting frame; 58, adsorption hose; 59, third bevel gear; 510, fourth bevel gear; 511, adhesive box; 512, heating stirring rod; 513, solenoid valve spray pipe; 6, conveyor belt. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0030] The following electrical components are all electrically connected through the external PLC controller.

[0031] See also Figures 1-9 A device for screening molding sand for butterfly valve casting comprises a base 1, a filter tank 2 is fixedly connected to the upper end of the base 1, a first motor 3 is installed on the outside of the filter tank 2, a filtering mechanism 4 for screening molding sand is provided on the inside of the filter tank 2, a conveyor belt 6 is installed on the upper end of the base 1, and a discharge mechanism 5 for evenly discharging molding sand is installed on the upper end of the conveyor belt 6.

[0032] In this embodiment, the filtering mechanism 4 includes a block removal component 41 for removing sintered sand blocks, and the filtering mechanism 4 also includes a classification component 42 for achieving coarse sand classification.

[0033] Specifically, the block removal component 41 is responsible for removing sintered sand blocks larger than 1.5 mm to ensure the subsequent classification accuracy. The classification component 42 achieves coarse sand classification with a particle size of 0.8 mm through airflow-assisted screening and vibration anti-blocking, and performs electrostatic agglomeration treatment on qualified particles.

[0034] In this embodiment, the picking block assembly 41 includes a second motor 411 installed at the upper end of the filter tank 2, the output shaft of the second motor 411 is fixedly connected to the first auger rod 412, the outer side of the first auger rod 412 is rotatably connected to the feeding sleeve 413, the lower end of the feeding sleeve 413 is fixedly connected to the punching cone 414 through a connecting rod, the punching cone 414 is rotatably connected to the inner side of the filter tank 2, the filtering hole of the punching cone 414 is a 1.5 mm round hole, the round hole is chamfered, and the inner wall of the punching cone 414 is provided with an inclined guide groove.

[0035] Specifically, the second motor 411 drives the first auger rod 412 to rotate, and drives the punching cone 414 to rotate in the opposite direction through the gear chain transmission to provide screening power. The first auger rod 412 rotates counterclockwise in the feeding sleeve 413, and the retained sintered sand blocks are spirally lifted to the discharge pipe 415. The feeding sleeve 413 supports the rotation of the first auger rod 412 and fixes the punching cone 414 to form a screening space. The inclined guide groove on the inner wall of the punching cone 414 guides the spiral sliding of the molding sand, and the 1.5mm chamfered circular holes filter particles with a particle size of ≤1.5mm. During rotation, the centrifugal force is used to accelerate the fine particles to pass through the screen.

[0036] In this embodiment, four groups of discharge pipes 415 are fixedly connected to the outside of the feeding sleeve 413, the inner wall of the discharge pipe 415 is provided with a Teflon coating, the outer side of the discharge pipe 415 passes through the punching cone 414, and the other end of the discharge pipe 415 is fixedly connected to the collection box 416, and the inner wall of the collection box 416 is fixedly connected to the punching cone 414.

[0037] Specifically, the Teflon coating on the inner wall of the discharge pipe 415 reduces the friction coefficient, ensuring smooth transportation of the sintered sand blocks, passing through the punching cone 414, and docking with the lifting path of the first auger rod 412. The collection box 416 is fixed to the punching cone 414 to collect the sintered sand blocks transported by the discharge pipe 415, thereby realizing centralized recovery of oversized particles.

[0038] In this embodiment, the outer side of the output shaft of the second motor 411 is fixedly connected to the first spur gear 417, the outer side of the first spur gear 417 is meshedly connected to the first chain 418, the inner side of the first chain 418 is meshedly connected to the second spur gear 419, the lower end of the second spur gear 419 is fixedly connected to the third spur gear 4110 through a rotating shaft, the outer side of the third spur gear 4110 is meshedly connected to the inner gear ring 4111, and the lower end of the inner gear ring 4111 is fixedly connected to the punching cone 414.

[0039] Specifically, the second motor 411 drives the second spur gear 419 through the first spur gear 417 and the first chain 418, thereby driving the inner gear ring 4111 through the third spur gear 4110 to drive the punching cone 414, and the gear chain transmission realizes the opposite rotation of the punching cone 414 and the first auger rod 412, and utilizes the speed difference to enhance the centrifugal screening effect.

[0040] In this embodiment, the classification component 42 includes a connecting rod 421 fixedly connected to the first auger rod 412, the lower end of the connecting rod 421 is fixedly connected to the first bevel gear 422, the outer side of the first bevel gear 422 is meshed with two groups of symmetrical second bevel gears 423, the two groups of second bevel gears 423 are fixedly connected to the ends away from each other with an airflow tube 424, the outer side of the airflow tube 424 is rotatably connected to the filter tank 2, the other end of the airflow tube 424 is rotatably connected to the input port of the air pump, multiple groups of linear array cameras 427 are installed on the outer side of the airflow tube 424, and two groups of symmetrical electromagnetic exhaust heads 428 are installed on the outer side of the airflow tube 424.

[0041] Specifically, the connecting rod 421 drives the second bevel gear 423 through the first bevel gear 422 to transmit the rotational power of the first auger rod 412 to the airflow tube 424, driving the airflow tube 424 to rotate. The airflow tube 424 is connected to the air pump, and outputs up and down bidirectional airflow through the electromagnetic exhaust head 428, blowing the sieve holes of the punching cone 414 upward and gathering sand downward for enhanced grading. The linear array camera 427 scans the falling molding sand in real time, identifies coarse sand and impurities with a particle size greater than 0.8 mm, and provides control data for the electromagnetic exhaust head 428.

[0042] In this embodiment, the outer side of the air flow tube 424 is fixedly connected to an arc-edge sleeve 425, and the outer side of the arc-edge sleeve 425 is rotatably connected to a pressure block 426. The upper end of one of the two groups of pressure blocks 426 is a concave surface, and the upper end of the other group of pressure blocks 426 is a convex surface. The lower ends of the two groups of pressure blocks 426 are commonly fixedly connected to a woven mesh 429, and the woven mesh 429 is rotatably connected to the inner side of the filter tank 2 through a rotating shaft.

[0043] Specifically, the arc-edge sleeve 425 rotates with the air flow tube 424, and drives the pressure block 426 to reciprocate and extrude the woven mesh 429 through the eccentric profile. The concave and convex surface design of the pressure block 426 causes the woven mesh 429 to produce 2-5mm lateral vibration, breaking up particle agglomeration and preventing 0.8mm sieve hole clogging. The 0.8mm aperture stainless steel screen of the woven mesh 429 is installed at an angle to achieve coarse sand classification, and guides particles larger than 0.8mm to slide toward the second auger rod 4210 during vibration.

[0044] In this embodiment, the woven mesh 429 is designed in a blade shape, and the woven mesh 429 is made of stainless steel. The diameter of the stainless steel wire of the woven mesh 429 is 0.4 mm. The upper end of the woven mesh 429 is rotatably connected to the second auger rod 4210, and one end of the second auger rod 4210 is fixedly connected to a spherical connecting block 4211. The spherical connecting block 4211 is rotatably connected to the inner side of the filter tank 2, and the outer side of the spherical connecting block 4211 is fixedly connected to the output shaft of the first motor 3. The inner side of the filter tank 2 is fixedly connected to a conductive screen 4212, and the surface of the conductive screen 4212 is coated with an ITO conductive film. The bottom of the conductive screen 4212 on the inner side of the filter tank 2 is fixedly connected to a collecting hopper 4213.

[0045] Specifically, the blade-shaped woven mesh 429 increases the contact area of ​​the particles and improves the screening efficiency. The stainless steel material is wear-resistant and corrosion-resistant. The second auger rod 4210 is not installed horizontally and has an inclination angle of 15°. It is driven by the first motor 3 through the spherical connecting block 4211 to discharge coarse sand greater than 0.8 mm from the filter tank 2. The surface conductive film of the conductive screen 4212 eliminates the electrostatic agglomeration of zirconium sand, ensuring that particles below 0.8 mm pass through the screen. The collecting hopper 4213 receives the qualified molding sand filtered by the conductive screen 4212 and transports it to the unloading mechanism 5.

[0046] In this embodiment, the unloading mechanism 5 includes a fourth spur gear 51 fixedly connected to the output shaft of the first motor 3, the outer side of the fourth spur gear 51 is meshed with the second chain 52, the inner side of the second chain 52 is meshed with the fifth spur gear 53, one end of the fifth spur gear 53 is fixedly connected to a threaded rod 54, and both ends of the threaded rod 54 are rotatably connected to a mounting bracket 57 through a rotating shaft. The lower end of the mounting bracket 57 is fixedly connected to the conveyor belt 6, and the outer side of the threaded rod 54 is threadedly connected to a mounting block 55, and the mounting block 55 is a convex design. An electric ceramic vibrator is installed inside the mounting block 55, the upper end of the mounting block 55 is slidably connected to the mounting frame 57, the inner side of the mounting block 55 is fixedly connected to a discharge pipe 56, one end of the discharge pipe 56 is fixedly connected to the collecting hopper 4213, the front end of the mounting block 55 is fixedly connected to an adsorption hose 58, the outer side of the adsorption hose 58 is fixedly connected to an adsorption tank, a polyurethane screen is provided inside the adsorption tank, the other end of the adsorption hose 58 is fixedly connected to the input port of the air pump, and a laser particle size analyzer is installed at the lower end of the mounting block 55.

[0047] Specifically, the first motor 3 drives the fourth spur gear 51, and then drives the fifth spur gear 53 through the second chain 52, thereby driving the threaded rod 54, driving the mounting block 55 to move back and forth along the conveyor belt 6, and the mounting block 55 has a built-in electric ceramic vibrator to vibrate the discharge pipe 56 to prevent blockage, and the front end adsorption hose 58 is connected to the air pump to capture dust. The laser particle size analyzer detects the specific surface area of ​​the molding sand in real time to provide data support for the addition of binder. The discharge pipe 56 moves with the mounting block 55 to evenly discharge the molding sand, and the conveyor belt 6 takes an S-shaped path to extend the detection distance.

[0048] In this embodiment, the other end of the threaded rod 54 is fixedly connected to the third bevel gear 59, the outer side of the third bevel gear 59 is meshedly connected to the fourth bevel gear 510, the front end of the fourth bevel gear 510 is rotatably connected to the adhesive box 511, the lower end of the adhesive box 511 is fixedly connected to the base 1, the inner side of the adhesive box 511 is rotatably connected to the heating stirring rod 512, the rear end of the heating stirring rod 512 is fixedly connected to the fourth bevel gear 510, and a solenoid valve spray pipe 513 is installed on one side of the adhesive box 511.

[0049] Specifically, the threaded rod 54 drives the fourth bevel gear 510 through the third bevel gear 59, thereby driving the heating stirring rod 512 to stir the resin in the adhesive box 511 at a constant temperature. The solenoid valve spray pipe 513 automatically adjusts the adhesive spraying amount according to the detection data of the laser particle size analyzer to achieve dynamic balance of the ratio.

[0050] Working principle: when in use, put the molding sand into the filter tank 2, first evenly lay it on the punching cone 414, the inclined guide groove on the inner wall of the punching cone 414 guides the molding sand to slide spirally toward the center, and during the sliding process, the particles with a particle size of ≤1.5mm pass through the chamfered circular holes on the cone wall and fall quickly, and the sintered sand blocks that cannot be filtered are retained on the surface of the cone and concentrated at the lower end of the feeding sleeve 413, avoiding the hidden dangers of screen blockage and uneven sand strength from the source, and starting the second motor 411. Its output shaft drives the first auger rod 412 to rotate in the feeding sleeve 413, and the retained sintered sand blocks are lifted by the auger rod spiral to the discharge pipe 415. The inner wall of the discharge pipe 415 has a special The Teflon coating ensures low-friction conveying. The output shaft of the second motor 411 drives the first spur gear 417 to rotate. The first spur gear 417 drives the second spur gear 419 to rotate via the first chain 418. The second spur gear 419 drives the inner gear ring 4111 via the third spur gear 4110. The inner gear ring 4111 drives the punching cone 414 to rotate, thereby causing the punching cone 414 and the first auger rod 412 to rotate in opposite directions. The centrifugal force generated by the rotation of the punching cone 414 forces the molding sand to adhere to the cylinder wall, accelerating the passage of fine particles through the sieve holes. The sintered sand blocks in the discharge pipe 415 are finally dropped into the collection box 416 by the centrifugal force, achieving efficient separation of oversized particles.

[0051] When the first auger rod 412 rotates, it drives the connecting rod 421 to rotate, and the connecting rod 421 drives the first bevel gear 422 to rotate. The first bevel gear 422 drives the airflow tube 424 to rotate through the second bevel gear 423. The airflow tube 424 drives the linear array camera 427 to scan the molding sand particles falling from the top in real time, identify coarse sand with a particle size greater than 0.8 mm and impurities with similar appearance such as zircon sand and titanium dioxide, and transmit the detection data synchronously to the control system, automatically adjust the opening and closing degree of the electromagnetic exhaust head 428, control the size of the airflow, and blow the outer surface of the punching cone 414 upward to remove particles that may block the sieve holes. The downward airflow gathers the molding sand above the woven mesh 429 to the middle to enhance the grading effect. The airflow tube 424 drives the arc edge sleeve 425 to rotate, and the arc edge sleeve 425 uses the protrusions and grooves of the pressing block 426 to make the woven mesh 429 produces left and right shaking, periodically squeezing the woven mesh 429, causing the woven mesh 429 to produce left and right shaking of 2-5mm, solving the problem of insufficient air permeability caused by fine powder agglomeration, meeting the strict requirements of the butterfly valve sealing surface area on the surface roughness of the sand mold, breaking particle agglomeration and preventing sieve hole clogging, and making coarse sand with a particle size greater than 0.8mm slide along the inclined surface of the woven mesh 429 to the second auger rod 4210. The first motor 3 drives the non-horizontally installed second auger rod 4210 to rotate through the spherical connecting block 4211, discharges and recycles the coarse sand from the filter tank 2, and the particles with a diameter less than 0.8mm that pass through the woven mesh 429 fall to the conductive screen 4212. The internal airflow eliminates the static electricity of the zircon sand particles and prevents agglomeration. Finally, the qualified particles fall into the collection hopper 4213, ensuring the refractoriness and anti-sand sticking performance of the molding sand for high-temperature butterfly valves.

[0052] The output shaft of the first motor 3 drives the fourth spur gear 51 to rotate, and the fourth spur gear 51 drives the fifth spur gear 53 to rotate through the second chain 52, and the fifth spur gear 53 drives the threaded rod 54 to rotate in the mounting frame 57, and the threaded rod 54 drives the mounting block 55 to move through the thread, and the mounting block 55 drives the discharge pipe 56 to discharge the molding sand in the collection hopper 4213 to the conveyor belt 6. When the mounting block 55 moves, the electric ceramic vibrator is used to prevent the discharge pipe 56 from being blocked. The molding sand is transported in an S-shaped path at the upper end of the conveyor belt 6, and the air pump absorbs the dust generated by the falling through the adsorption hose 58, and then passes through the polyurethane The ester screen captures fine powder less than 0.2mm. The threaded rod 54 drives the third bevel gear 59 to rotate. The third bevel gear 59 drives the heating stirring rod 512 to rotate inside the binder box 511 through the fourth bevel gear 510 to maintain a constant temperature of the resin and ensure spraying accuracy. When the mounting block 55 moves, it drives the laser particle size analyzer to move synchronously for online detection. According to the specific surface area of ​​the screened sand particles, the control system automatically adjusts the spraying amount of the solenoid valve spray pipe 513 and automatically controls the amount of resin added, thereby solving the problem of binder ratio imbalance caused by changes in the morphology of the regenerated sand particles and significantly reducing the cracking rate and pore defect rate of the butterfly valve sand core.

[0053] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for screening molding sand for butterfly valve casting, comprising a base, characterized in that: The upper end of the base is fixedly connected to a filter tank, a first motor is installed on the outside of the filter tank, a filter mechanism for screening molding sand is provided on the inside of the filter tank, a conveyor belt is installed on the upper end of the base, a feeding mechanism for evenly discharging molding sand is installed on the upper end of the conveyor belt, the filtering mechanism includes a block removal assembly, the filtering mechanism also includes a classification assembly, the block removal assembly includes a second motor installed on the upper end of the filter tank, the output shaft of the second motor is fixedly connected to the first auger rod, the outer side of the first auger rod is rotatably connected to the feeding sleeve, the lower end of the feeding sleeve The end is fixedly connected to a punching cone through a connecting rod, and the punching cone is rotatably connected to the inner side of the filter tank. The classification component includes a connecting rod fixedly connected to the first auger rod, and the lower end of the connecting rod is fixedly connected to a first bevel gear, and the outer side of the first bevel gear is meshed and connected with two sets of symmetrical second bevel gears, and the ends of the two sets of second bevel gears away from each other are fixedly connected to an air flow pipe. The feeding mechanism includes a fourth spur gear fixedly connected to the output shaft of the first motor, the outer side of the fourth spur gear is meshed and connected with a second chain, and the inner side of the second chain is meshed and connected with a fifth spur gear. One end of the fifth spur gear is fixedly connected to a threaded rod, and both ends of the threaded rod are rotatably connected to the mounting bracket through a rotating shaft. The lower end of the mounting bracket is fixedly connected to the conveyor belt, and the outer side of the threaded rod is threadedly connected to the mounting block. The mounting block is convex in design, and an electric ceramic vibrator is installed inside the mounting block. The upper end of the mounting block is slidably connected to the mounting bracket, and the inner side of the mounting block is fixedly connected to a feeding pipe, and one end of the feeding pipe is fixedly connected to the collecting hopper. The front end of the mounting block is fixedly connected to an adsorption hose, and the outer side of the adsorption hose is fixedly connected to an adsorption tank. A polyurethane screen is provided inside the adsorption tank, the other end of the adsorption hose is fixedly connected to the input port of the air pump, the lower end of the mounting block is installed with a laser particle size analyzer, the other end of the threaded rod is fixedly connected to the third bevel gear, the outer side of the third bevel gear is meshed with the fourth bevel gear, the front end of the fourth bevel gear is rotatably connected to the adhesive box, the lower end of the adhesive box is fixedly connected to the base, the inner side of the adhesive box is rotatably connected to a heating stirring rod, the rear end of the heating stirring rod is fixedly connected to the fourth bevel gear, and a solenoid valve spray pipe is installed on one side of the adhesive box.

2. The device for screening molding sand for butterfly valve casting according to claim 1, characterized in that: The filtering hole of the punching cone is a 1.5 mm round hole, the round hole is chamfered, and the inner wall of the punching cone is provided with an inclined guide groove.

3. The device for screening molding sand for butterfly valve casting according to claim 1, characterized in that: Four sets of discharge pipes are fixedly connected to the outside of the feeding sleeve, the inner walls of the discharge pipes are provided with Teflon coating, the outer sides of the discharge pipes pass through the punching cone, and the other end of the discharge pipes is fixedly connected to a collecting box, and the inner wall of the collecting box is fixedly connected to the punching cone.

4. The device for screening molding sand for butterfly valve casting according to claim 1, characterized in that: The outer side of the output shaft of the second motor is fixedly connected to the first spur gear, the outer side of the first spur gear is meshed with the first chain, the inner side of the first chain is meshed with the second spur gear, the lower end of the second spur gear is fixedly connected to the third spur gear through a rotating shaft, the outer side of the third spur gear is meshed with the inner gear ring, and the lower end of the inner gear ring is fixedly connected to the punching cone.

5. The device for screening molding sand for butterfly valve casting according to claim 1, characterized in that: The outer side of the airflow tube is rotatably connected to the filter tank, and the other end of the airflow tube is rotatably connected to the input port of the air pump. Multiple groups of linear array cameras are installed on the outer side of the airflow tube, and two groups of symmetrical electromagnetic exhaust heads are installed on the outer side of the airflow tube.

6. The device for screening molding sand for butterfly valve casting according to claim 1, characterized in that: The outer side of the airflow tube is fixedly connected to an arc-edge sleeve, and the outer side of the arc-edge sleeve is rotatably connected to a pressure block. The upper end of one of the two groups of pressure blocks is concave, and the upper end of the other group of pressure blocks is convex. The lower ends of the two groups of pressure blocks are commonly fixedly connected to a woven mesh, and the woven mesh is rotatably connected to the inner side of the filter tank through a rotating shaft.

7. The device for screening molding sand for butterfly valve casting according to claim 6, characterized in that: The woven mesh is designed in a blade shape and is made of stainless steel. The diameter of the stainless steel wire of the woven mesh is 0.4 mm. The upper end of the woven mesh is rotatably connected to a second auger rod, and one end of the second auger rod is fixedly connected to a spherical connecting block. The spherical connecting block is rotatably connected to the inner side of the filter tank, and the outer side of the spherical connecting block is fixedly connected to the output shaft of the first motor. The inner side of the filter tank is fixedly connected to a conductive screen, and the surface of the conductive screen is coated with an ITO conductive film. A collection hopper is fixedly connected below the conductive screen inside the filter tank.

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