Precoated sand casting production line and process based on intelligent casting island

Abstract

The invention relates to the technical field of precoated sand casting, and discloses a precoated sand casting production line based on an intelligent casting island, the precoated sand casting production line comprises a machine body, a sand feeding pipe, a negative pressure sand suction pipe, a distance adjusting piece and a rotatable transmission shaft are respectively mounted in the machine body, and the distance adjusting piece is in transmission connection with two mold frames which are symmetrically arranged and have an adjustable distance; casting systems are arranged on the two mold frames, and each casting system comprises a toothed plate mounted on the machine body, a magnetic field generator mounted on the machine body, a casting frame capable of synchronously moving back and forth and left and right on the mold frames in a reciprocating manner, and a synchronous shaft capable of periodically and alternately rotating forwards and backwards. Technical breakthrough is achieved through the synergistic effect of the magnetic vibration coating and multi-mode vibration, Fe70Ga30 alloy nano-particles of the functional layer generate magnetic domain periodic orientation in an alternating magnetic field, micron-sized multi-axial vibration is excited, the surface of molding sand and a mold interface is deepened, intermolecular acting force is destroyed, deep-layer adhesive sand is stripped in a non-contact mode, and the surface of the mold is stripped in a non-contact mode. The problem that energy penetration of traditional impact type cleaning is insufficient is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of coated sand casting, and more specifically, to a coated sand casting production line and process based on an intelligent casting island. Background Art

[0002] An intelligent casting island is an automatic working platform with intelligent production functions. Currently, when casting coated sand molds, a special casting production line is used. In the prior art, the patent document with the publication number CN118875228B discloses a coated sand casting production line and process based on an intelligent casting island, including a mounting frame, symmetrically arranged casting molds fixedly connected to the mounting frame, a discharging machine slidably connected to the mounting frame, a sand casting machine slidably connected to the discharging machine, and also including symmetrically arranged fixing plates fixedly connected to the mounting frame, and an electric push rod fixedly connected between the symmetrically arranged fixing plates. When the above device completes one sand mold casting each time, the air injection pipe can move back and forth to inject air to clean the inner wall of the casting mold, avoiding the influence of residual coated sand in the casting mold on the quality of the subsequent cast sand mold. However, the following technical problems exist when using the above device:

[0003] Air jet cleaning can only remove the loose sand on the surface, and has a poor peeling effect on the deeply adhered molding sand, especially in the high-density curing area, resulting in residual sand grains in the inner cavity of the mold, affecting the accuracy of subsequent castings. During the air jet process, the loose sand is scattered irregularly, and manual cleaning of the scattered sand grains is required, increasing production costs. At the same time, the sand recovery rate is low, causing waste of resources. The traditional cleaning method relies on concentrated energy impact, which easily leads to local stress concentration in the mold, causing wear or deformation and shortening the mold life;

[0004] Based on this, the present invention provides a coated sand casting production line and process based on an intelligent casting island to solve the technical problems raised in the above background art. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a coated sand casting production line and process based on an intelligent casting island. The present invention achieves a technical breakthrough through the synergistic effect of magnetostrictive vibration coating and multi-mode vibration. The Fe 70 Ga 30 alloy nanoparticles in the functional layer generate periodic orientation of magnetic domains in the alternating magnetic field, exciting micron-scale multi-axial vibration, penetrating deep into the interface between the molding sand and the mold, breaking the intermolecular force, and realizing non-contact peeling of the deeply adhered sand, solving the problem of insufficient energy penetration in traditional impact cleaning.

[0006] To achieve the above object, the present invention provides the following technical solutions: A resin-coated sand casting production line based on an intelligent casting island, including a machine body, in which a sand delivery pipe, a negative pressure sand suction pipe, a distance adjusting member, and a rotatable transmission shaft are respectively installed. Two symmetrically arranged and distance-adjustable die carriers are drivingly connected to the distance adjusting member, and casting systems are provided on both die carriers;

[0007] The casting system includes a toothed plate installed on the machine body, a magnetic field generator installed on the machine body, a casting frame that can move synchronously back and forth and left and right on the die carrier, and a synchronous shaft that can periodically rotate forward and backward alternately. The synchronous shaft is rotatably installed on the casting frame. When the transmission shaft works, the reciprocating frequency and reciprocating stroke of the casting frame change periodically in a cycle. A turning frame is installed on the casting frame. Two symmetrically arranged 90° turning tooth sections for driving the turning frame to turn 90° are provided on the toothed plate. A set of spaced 45° turning tooth sections are provided at the position corresponding to the two 90° turning tooth sections on the toothed plate. A sand throwing shaft driven by the synchronous shaft is rotatably installed in the turning frame. A casting mold is installed on the sand throwing shaft. A hollow flow channel communicating with the inner cavity of the casting mold is provided on the sand throwing shaft. The inner cavity of the casting mold is coated with a magneto-vibrating coating. The magneto-vibrating coating is excited by an alternating magnetic field to generate multi-axial micro-vibrations to realize the separation of the molding sand from the casting mold;

[0008] The magneto-vibrating coating includes a transition layer, a functional layer, and a heat insulation layer arranged in sequence from the inside to the outside.

[0009] As a preferred technical solution of the present invention, a microcontroller is installed on the end face of the machine body. A box door is provided in the middle of the machine body. A sand collecting cavity with an open top is provided inside the machine body corresponding to the position below the casting mold. A first driving motor is installed on the side of the machine body. The output shaft end of the first driving motor is fixedly connected to the transmission shaft. An electric heater for drying and self-separating the molding sand is provided in the casting mold. The heating temperature of the electric heater is 220°C - 260°C.

[0010] As a preferred technical solution of the present invention, the distance adjusting member includes a clamping lead screw rotatably connected inside the machine body. A second driving motor is installed on the side of the machine body. The output shaft end of the second driving motor is fixedly connected to the clamping lead screw. A positive thread section and a reverse thread section are symmetrically arranged on the clamping lead screw. The positive thread section and the reverse thread section are respectively drivingly connected to the two die carriers.

[0011] As a preferred technical solution of the present invention, a vibrating sand frame, a square shaft, a small square shaft, a transverse screw rod and a hollow rotating sleeve are rotatably installed in the mold frame, and the hollow rotating sleeve is driven by a transmission shaft. The first bevel gear is installed on the hollow rotating sleeve and the square shaft, and the two first bevel gears are orthogonally meshed. A synchronous toothed belt is connected between the small square shaft and the transverse screw rod for transmission. The vibrating sand frame is rotatably installed with a wheel axle, a longitudinal screw rod, a first rotating sleeve linked to the square shaft, and a second rotating sleeve linked to the small square shaft, respectively. A large gear with missing teeth and a small gear with missing teeth are respectively installed on the first rotating sleeve. Two symmetrically arranged meshing interruption areas are provided on the first rotating sleeve and correspond to the positions between the large gear with missing teeth and the small gear with missing teeth. The center angle corresponding to the toothed meshing section on the gear is 180°, the center angle corresponding to the toothed meshing section of the toothless pinion is 120°, and the center angles corresponding to the two meshing interruption zones are both 30°. Two full-tooth gears are installed on the second rotating sleeve, and the two full-tooth gears are respectively meshed with the toothless large gear and the toothless pinion. Second bevel gears are installed on the wheel axle and the longitudinal screw rod, and the two second bevel gears are orthogonally meshed. The longitudinal screw rod is transmission-connected to the casting frame, and the first rotating sleeve is transmission-connected with a first elastic transmission belt, and the wheel axle and the synchronous shaft are both transmission-connected with the first elastic transmission belt. The rotation connection between the transverse screw rod and the mold frame and the rotation connection between the longitudinal screw rod and the vibrating sand frame are both provided with a first torsion spring.

[0012] As a preferred technical solution of the present invention, the interior of the hollow rotating sleeve is fixed with a first synchronous square groove with two ends penetrating therethrough and slidably connected to the transmission shaft, the interior of the first rotating sleeve is fixed with a second synchronous square groove with two ends penetrating therethrough and slidably connected to the square shaft, and the interior of the second rotating sleeve is fixed with a third synchronous square groove with two ends penetrating therethrough and slidably connected to the small square shaft, and the cross-sections of the first synchronous square groove, the second synchronous square groove, the third synchronous square groove, the transmission shaft, the square shaft and the small square shaft are all regular polygons.

[0013] As a preferred technical solution of the present invention, a turning shaft is installed on the back of the turning frame, a gear sleeve is provided on the turning shaft for rotation, and a linkage sleeve is rotatably installed on the sand vibrating frame, a second elastic transmission belt is transmission-connected between the linkage sleeve and the turning shaft, the first elastic transmission belt and the second elastic transmission belt can both be elastically stretched, a large square shaft is rotatably installed on the mold frame, a fourth synchronous square groove with openings at both ends is fixedly opened inside the linkage sleeve and is slidably connected to the large square shaft, the cross-sections of the fourth synchronous square groove and the large square shaft are both regular polygons, a turning gear is installed on the tail end of the large square shaft, the turning gear is meshed with the 90° turning tooth segment and the 45° turning tooth segment, synchronous gears are installed on the synchronous shaft and the gear sleeve, a toothless bevel gear is installed on the synchronous shaft, a full-tooth bevel gear is installed on the sand-throwing shaft, the toothless bevel gear is meshed with the full-tooth bevel gear, and a second torsion spring is provided at the rotation connection between the sand-throwing shaft and the turning frame and at the rotation connection between the large square shaft and the mold frame.

[0014] As a preferred technical solution of the present invention, a lifting frame is provided in the machine body, a group of lifting push rods are installed between the lifting frame and the machine body, the sand delivery pipe and the negative pressure sand suction pipe are both installed on the lifting frame, an upper connecting head is installed on the sand delivery pipe and the negative pressure sand suction pipe and corresponding to the positions of the two casting systems, a sand delivery joint is installed in the middle of the sand delivery pipe, a negative pressure joint is installed in the middle of the negative pressure sand suction pipe, a lower connecting head adapted to be connected to the upper connecting head is installed on the mold frame, an annular cavity connected to the hollow flow channel is fixedly opened on the flip frame, and a corrugated metal conduit is connected between the lower connecting head and the annular cavity.

[0015] As a preferred technical solution of the present invention, it is characterized in that: the transition layer is a nano-laminate of Al2O3 and TiN deposited alternately, and the functional layer is Fe 70 Ga 30 The alloy nanoparticles and vertically oriented graphene are composited, and the Fe 70 Ga 30 The particle size of the alloy nanoparticles is 50nm-80nm, the interlayer spacing of the vertically oriented graphene is 0.36nm-0.40nm, and Fe3C nanocrystals are embedded. The thermal insulation layer is a ZrO2 gradient ceramic containing a Y2O3 stabilizer. The output frequency of the magnetic field generator is 1kHz-20kHz, the magnetic field strength is 0.1T-0.5T, and the direction of the magnetic field is at an angle of 30°-60° with the surface of the casting mold.

[0016] As a preferred technical solution of the present invention, a toothless area is provided between adjacent 90° flipping tooth segments and between adjacent 45° flipping tooth segments on the tooth plate. The length of the toothless area is the same as that of the 45° flipping tooth segment. During the coated sand casting, the inner cavity of the casting mold is filled with material through a sand feeding pipe. After the coated sand casting is completed, the two casting molds move away from each other to a first distance. After reaching the first distance, the transmission shaft is continuously driven, and the casting mold is flipped downward by 90°. When the two casting molds move away to a second distance, they keep flipping downward by 90° and continuously oscillate with variable frequency and variable stroke. The hollow flow channel is communicated with the negative pressure sand suction pipe, and the magnetostrictive vibration coating realizes sand stripping under the coupling action of the magnetic field generator. When the casting mold moves away between the first distance and the second distance, it first resets from the 90° flipping state and then reciprocally flips within 45°. The first distance is 3 times the width of the casting mold, and the second distance is 6 times the width of the casting mold.

[0017] As a preferred technical solution of the present invention, the production process of the coated sand casting production line based on the intelligent casting island includes the following steps:

[0018] SS01. Mold closing and sand injection: The two mold frames are driven to close by the distance adjusting member, and the coated sand is injected into the inner cavity of the casting mold under high pressure through the sand feeding pipe. The electric heater heats to 220°C - 260°C to quickly solidify and form the coated sand.

[0019] SS02. Mold opening and vibration stripping: The mold frames are first separated to the mold opening distance, and the solidified and formed coated sand formed parts are removed and discharged. Subsequently, the mold frames are separated to the first distance, and the casting mold is flipped downward by 90°. The loose molding sand falls off under the action of gravity. The transmission shaft drives the casting frame to vibrate periodically, combined with the multi-axial micro-vibration of the magnetostrictive vibration coating, to strip the deeply adhered molding sand. The synchronous sand throwing shaft rotates reciprocally to clean the residual sand synergistically by using the centrifugal force and the vibration inertia force.

[0020] SS03. Negative pressure sand suction and flipping reset: The mold frames are separated to the second distance, and the casting mold keeps flipping by 90° and continuously oscillates, combined with the micro-amplitude oscillation of the 45° flipping tooth segment, to further clean the weakly adhered sand. The negative pressure sand suction pipe adsorbs the residual sand grains through the hollow flow channel to ensure the cleanliness of the inner cavity of the mold.

[0021] SS04. Reset and cycle: The mold frames are reset to the initial position, and the lifting frame adjusts the heights of the sand feeding pipe and the negative pressure sand suction pipe to prepare for the next cycle. The microcontroller coordinates the vibration frequency, magnetic field intensity, and flipping angle throughout the process to achieve intelligent production.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. In the prior art, jet cleaning can only remove the loose sand on the surface, and has poor effect on stripping the deeply adhered sand in the high-density solidified area. The present invention achieves a technical breakthrough through the synergistic effect of magneto-induced vibration coating and multi-mode vibration. The Fe 70 Ga 30 alloy nanoparticles in the functional layer generate periodic orientation of magnetic domains in the alternating magnetic field, excite micron-scale multi-axial vibration, penetrate into the interface between the sand and the mold, break the intermolecular force, and realize non-contact stripping of the deeply adhered sand, solving the problem of insufficient energy penetration in traditional impact cleaning. The casting rack performs a periodic cyclic motion of "high-frequency small stroke, reset, low-frequency large stroke, intermittent", matches the sand adhesion gradient, combines the centrifugal force and vibration inertia force composite field generated by the reciprocating rotation of the sand throwing shaft, and forms a three-dimensional synergistic effect of "vibration impact, rotary throwing, and magneto-induced micro-vibration". Compared with the prior art, the stripping efficiency of the deep sand is improved.

[0024] 2. In the prior art, jet cleaning causes irregular sprinkling of sand grains, which requires manual cleaning and has a low recovery rate. The present invention realizes innovation through a closed-loop process of gravity pre-discharge, vibration stripping, and negative pressure adsorption. When the casting mold is at the first distance, it turns down 90°, and more than 80% of the loose sand naturally falls into the sand collection cavity by gravity, reducing sprinkling pollution. When at the second distance, it maintains a 90° turn, and further discharges the deep sand in cooperation with the low-frequency large-stroke oscillation, reducing the subsequent adsorption load. The hollow flow channel is connected to the negative pressure sand suction pipe, and the slightly adhered sand grains are recovered by negative pressure adsorption during the intermittent stage. The sand material recovery rate is improved, and the whole process does not require manual intervention, reducing production costs. The toothless area design of the tooth plate makes the mold form a "turning pause" rhythm during the 45° reciprocating turn, simulating the logic of manual tapping, avoiding the suspension of sand grains caused by vibration, and ensuring efficient and stable negative pressure adsorption.

[0025] 3. Traditional cleaning relies on concentrated energy impact, which easily causes local stress concentration and wear of the mold. The present invention realizes technological innovation through flexible transmission and layered force design. The elastic stretching characteristics of the first elastic transmission belt and the second elastic transmission belt can absorb the instantaneous impact force during the vibration of the casting rack and the rotation of the turning rack, avoiding mold wear caused by rigid transmission. The second torsion spring provides buffering when the turning gear meshes, preventing the gear from being overloaded and broken. Compared with the prior art, the mold wear rate is reduced. High-frequency small energy is used for surface cleaning, low-frequency large energy is used for deep cleaning, and intermittent buffering is used for stress release, avoiding damage to the mold caused by traditional single strong impact. The non-contact stripping of the magneto-induced vibration coating does not require mechanical contact, further reducing physical wear and prolonging the mold life. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of a resin-coated sand casting production line based on the intelligent casting island of the present invention;

[0027] Figure 2Schematic structural diagram of the distance adjusting member and the lifting push rod of the present invention;

[0028] Figure 3 Schematic structural diagram of the sand feeding pipe and the negative pressure sand suction pipe of the present invention;

[0029] Figure 4 Schematic structural diagram of the second torsion spring and the 45° flipping tooth section of the present invention;

[0030] Figure 5 Schematic structural diagram of the die holder and the large square shaft of the present invention;

[0031] Figure 6 For the present invention Figure 5 Partial enlarged structural diagram at position A in;

[0032] Figure 7 For the present invention Figure 5 Partial enlarged structural diagram at position B in;

[0033] Figure 8 Schematic structural diagram of the hollow rotating sleeve and the small square shaft of the present invention;

[0034] Figure 9 Schematic structural diagram of the casting frame and the second elastic transmission belt of the present invention;

[0035] Figure 10 Exploded structural diagram of the missing tooth bevel gear and the integral tooth bevel gear of the present invention;

[0036] Figure 11 Schematic cross-sectional structural diagram of the magnetostrictive vibration coating of the present invention.

[0037] In the figure: 1, machine body; 2, sand feeding pipe; 3, negative pressure sand suction pipe; 4, distance adjusting member; 5, transmission shaft; 6, die holder; 7, toothed plate; 8, magnetic field generator; 9, casting frame; 10, synchronous shaft; 11, flipping frame; 12, 90° flipping tooth section; 13, 45° flipping tooth section; 14, sand throwing shaft; 15, casting mold; 16, magnetostrictive vibration coating; 17, transition layer; 18, functional layer; 19, heat insulation layer; 20, box door; 21, electric heater; 22, sand vibrating frame; 23, middle square shaft; 24, small square shaft; 25, transverse lead screw; 26, hollow rotating sleeve; 27, wheel shaft; 28, longitudinal lead screw; 29, first rotating sleeve; 30, second rotating sleeve; 31, missing tooth large gear; 32, missing tooth small gear; 33, integral tooth gear; 34, first elastic transmission belt; 35, first torsion spring; 36, toothed sleeve; 37, linkage sleeve; 38, second elastic transmission belt; 39, large square shaft; 40, flipping gear; 41, synchronous gear; 42, missing tooth bevel gear; 43, integral tooth bevel gear; 44, second torsion spring; 45, lifting frame; 46, lifting push rod; 47, upper connecting head; 48, lower connecting head. Detailed implementation manners

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] As Figures 1 to 11 shown, the present invention provides a coated sand casting production line based on an intelligent casting island, which includes a machine body 1. A sand delivery pipe 2, a negative pressure sand suction pipe 3, an adjustable distance member 4, and a rotatable transmission shaft 5 are respectively installed in the machine body 1. Two symmetrically arranged and distance-adjustable die carriers 6 are drivingly connected to the adjustable distance member 4, and casting systems are provided on both die carriers 6; a microcontroller is installed on the end face of the machine body 1, a box door 20 is provided in the middle of the machine body 1, a sand collection cavity with an open top is provided in the machine body 1 at a position corresponding to the lower part of the casting mold 15, and a first driving motor is installed on the side of the machine body 1. The output shaft end of the first driving motor is fixedly connected to the transmission shaft 5; the intelligent cooperative control of the core components of the production line is realized through the microcontroller to improve the automation level of the casting process; the design of the box door 20 in the middle of the machine body 1 facilitates the blanking of the cast molded parts; the sand collection cavity under the casting mold 15 can directly collect the molding sand scattered during the demolding process, reduce the waste of sand materials and lower the manual cleaning cost; the direct connection design of the first driving motor and the transmission shaft 5 ensures the high responsiveness of power transmission; after the two casting molds 15 are closed, loose coated sand is injected through compressed air for heating and shaping.

[0040] A lifting frame 45 is provided in the machine body 1. A set of lifting push rods 46 are installed between the lifting frame 45 and the machine body 1. The sand delivery pipe 2 and the negative pressure sand suction pipe 3 are both installed on the lifting frame 45. An upper connector 47 is installed on the sand delivery pipe 2 and the negative pressure sand suction pipe 3 at positions corresponding to the two casting systems. A sand delivery joint is installed in the middle of the sand delivery pipe 2, and a negative pressure joint is installed in the middle of the negative pressure sand suction pipe 3. A lower connector 48 adapted to be connected to the upper connector 47 is installed on the die carrier 6. An annular cavity communicating with the hollow flow channel is fixedly opened on the turning frame 11, and a corrugated metal conduit is communicated between the lower connector 48 and the annular cavity; the lifting frame 45 can flexibly adjust the heights of the sand delivery pipe 2 and the negative pressure sand suction pipe 3 through the lifting push rods 46 to adapt to the sand injection and sand suction requirements of the casting mold 15; the quick docking design of the upper connector 47 and the lower connector 48, combined with the elastic stretching characteristics of the corrugated metal conduit, ensures that when the turning frame 11 reciprocates with the casting frame 9, the sand material conveying pipeline or the sand suction pipeline is always in sealed communication with the hollow flow channel to avoid sand material leakage; the sand delivery joint is communicated with the high-pressure feeding equipment of the loose coated sand, and the negative pressure joint is communicated with an external negative pressure vacuum cleaner.

[0041] The distance adjusting member 4 includes a clamping lead screw rotatably connected inside the machine body 1. A second driving motor is installed on the side of the machine body 1, and the output shaft end of the second driving motor is fixedly connected to the clamping lead screw. A positive thread section and a reverse thread section are symmetrically arranged on the clamping lead screw, and the positive thread section and the reverse thread section are respectively in transmission connection with two die carriers 6. By driving the clamping lead screw to rotate through the second driving motor and utilizing the symmetrical design of the positive thread section and the reverse thread section, synchronous and equidistant adjustment of the two die carriers 6 is achieved. When the second driving motor rotates forward, the two die carriers 6 approach each other and finally complete mold clamping. When the second driving motor rotates forward, the two die carriers 6 move away from each other and finally complete mold opening.

[0042] The casting system includes a tooth plate 7 mounted on the machine body 1, a magnetic field generator 8 mounted on the machine body 1, a casting frame 9 that can synchronously move back and forth and left and right on the mold frame 6, and a synchronous shaft 10 that can periodically alternate forward and reverse, and the synchronous shaft 10 is rotatably mounted on the casting frame 9; when the transmission shaft 5 is working, the reciprocating frequency and reciprocating stroke of the casting frame 9 change periodically; a vibrating sand frame 22, a middle shaft 23, a small square shaft 24, a transverse screw rod 25 and a hollow rotating sleeve 26 are rotatably mounted in the mold frame 6, and the hollow rotating sleeve 26 is driven by the transmission shaft 5; the interior of the hollow rotating sleeve 26 is fixed with two ends through and connected to the transmission shaft 5 is a first synchronous square groove slidably connected; a first bevel gear is installed on both the hollow rotating sleeve 26 and the square shaft 23, and the two first bevel gears are orthogonally meshed; a synchronous toothed belt is connected between the small square shaft 24 and the transverse screw rod 25, and a wheel shaft 27, a longitudinal screw rod 28, a first rotating sleeve 29 linked with the square shaft 23, and a second rotating sleeve 30 linked with the small square shaft 24 are rotatably installed on the vibration sand frame 22; the interior of the first rotating sleeve 29 is fixedly provided with a second synchronous square groove with two ends penetrating and slidably connected to the square shaft 23, and the interior of the second rotating sleeve 30 is fixedly provided with two ends penetrating and slidably connected to the small square shaft 24. The third synchronous square groove connected to the first synchronous square groove, the cross-sections of the first synchronous square groove, the second synchronous square groove, the third synchronous square groove, the transmission shaft 5, the square shaft 23 and the small square shaft 24 are all regular polygons; the first rotating sleeve 29 is respectively mounted with a toothless large gear 31 and a toothless small gear 32, and two symmetrically arranged meshing interruption areas are provided on the first rotating sleeve 29 and corresponding to the position between the toothless large gear 31 and the toothless small gear 32. The center angle corresponding to the toothed meshing section on the toothless large gear 31 is 180°, and the center angle corresponding to the toothed meshing section on the toothless small gear 32 is 120°. The center angles corresponding to the two meshing interruption areas are both 30 °; Two toothed gears 33 are installed on the second rotary sleeve 30, and the two toothed gears 33 are meshed with the toothless large gear 31 and the toothless small gear 32 respectively; the wheel axle 27 and the longitudinal screw rod 28 are both equipped with a second bevel gear, and the two second bevel gears are orthogonally meshed. The longitudinal screw rod 28 is transmission-connected to the casting frame 9, and the first rotary sleeve 29 is transmission-connected with a first elastic transmission belt 34. The wheel axle 27 and the synchronous shaft 10 are both transmission-connected with the first elastic transmission belt 34, and the first torsion spring 35 is provided at the rotation connection between the transverse screw rod 25 and the mold frame 6 and the rotation connection between the longitudinal screw rod 28 and the vibrating sand frame 22.

[0043] The transmission shaft 5 is driven to rotate by the first driving motor and is slidably connected to the transmission shaft 5 through the first synchronous square groove inside the hollow rotating sleeve 26, so as to realize the synchronous rotation of the hollow rotating sleeve 26 and the transmission shaft 5. The hollow rotating sleeve 26 drives the middle square shaft 23 to rotate through the first bevel gear. The middle square shaft 23 further drives the first rotating sleeve 29 to rotate synchronously through the second synchronous square groove. The first rotating sleeve 29 is integrated with a large gear with missing teeth 31, a small gear with missing teeth 32 and two 30° meshing interruption zones, forming a periodic meshing and interruption transmission logic with the two integral-tooth gears 33 on the second rotating sleeve 30: when the first rotating sleeve 29 rotates, the 180° toothed section of the large gear with missing teeth 31 meshes with the integral-tooth gear 33, driving the second rotating sleeve 30 to rotate at a high speed, and this state corresponds to the reciprocating vibration in the high-frequency stage; after the meshing of the large gear with missing teeth 31 ends, it enters the 30° meshing interruption zone, and the second rotating sleeve 30 loses power. Depending on the restoring force of the first torsion spring 35, the longitudinal lead screw 28 rotates in the reverse direction, corresponding to the "reset stage". Subsequently, the 120° toothed section of the small gear with missing teeth 32 meshes with the integral-tooth gear 33, driving the second rotating sleeve 30 to rotate at a low speed, corresponding to the "reciprocating vibration in the low-frequency stage". After the meshing of the small gear with missing teeth 32 ends, it enters the 30° meshing interruption zone again, and the second rotating sleeve 30 is reset again corresponding to the "intermittent stage". The periodic rotation of the second rotating sleeve 30 is transmitted to the longitudinal lead screw 28 through the wheel shaft 27. The forward and reverse rotations of the longitudinal lead screw 28 drive the casting frame 9 to reciprocate back and forth on the die holder 6. At the same time, the small square shaft 24 drives the transverse lead screw 25 to rotate through the synchronous belt. The forward and reverse rotations of the transverse lead screw 25 drive the casting frame 9 to reciprocate left and right. Due to the meshing period of the gear set with missing teeth, the reciprocating frequency of the casting frame 9 is determined by the duration of the meshing section; the reciprocating stroke is determined by the number of turns of the longitudinal lead screw 28 and the transverse lead screw 25, showing a periodic cycle of "high-frequency small stroke to reset to low-frequency large stroke to intermittent"; the first rotating sleeve 29 simultaneously drives the wheel shaft 27 and the synchronous shaft 10 through the first elastic transmission belt 34. During the meshing interruption of the gear set with missing teeth, the rotation direction of the wheel shaft 27 is affected by the restoring force of the first torsion spring 35. Through the elastic buffering of the first elastic transmission belt 34, the synchronous shaft 10 is driven by the wheel shaft 27 to realize periodic alternating forward and reverse rotations, ensuring the uniform distribution and density of the abrasive in the inner cavity of the mold.

[0044] When the abrasive is injected into the inner cavity of the casting mold 15 under high pressure or during the mold closing stage, the transmission shaft 5 remains stationary; during the cleaning process of the molding sand in the casting mold 15, the casting frame 9 can achieve the following technical effects through the periodic cyclic motion of "high frequency, small stroke, reset, low frequency, large stroke, intermittent": The adhesion state of the molding sand in the mold varies with the degree of curing, including surface loose sand, deep dense sand, and local strongly adhered sand. The periodic motion of the casting frame 9 precisely matches this characteristic: High frequency, small stroke stage: The micro-impact generated by the short-stroke, high-frequency vibration can efficiently peel off the loose molding sand on the mold surface, preventing the loose sand from being randomly scattered due to violent vibration; Reset stage: The casting frame 9 quickly resets to the initial position under the action of the first torsion spring 35, providing space for the subsequent large-stroke vibration. At the same time, the inertia is used to make the peeled loose sand naturally fall into the sand collecting cavity; Low frequency, large stroke stage: The strong impact energy generated by the long-stroke, low-frequency vibration can penetrate the deep molding sand and break the strong adhesion force at its interface with the mold, peeling off the residual dense sand; Intermittent stage: When the vibration pauses, the sand grains fully settle under the action of gravity, avoiding the suspension of sand grains caused by continuous vibration. At the same time, it provides a stable sand suction environment for the negative pressure sand suction pipe 3.

[0045] The traditional cleaning method is prone to local wear or deformation of the mold due to energy concentration. However, the periodic motion realizes the gradient distribution of vibration energy through the energy release mode of "high frequency, small energy, low frequency, large energy, intermittent buffer". The cooperation between the periodic motion and the negative pressure sand suction pipe 3 forms a closed-loop cleaning process of "vibration peeling, gravity settlement, negative pressure adsorption": The high frequency, small stroke quickly peels off the loose sand, shortening the cleaning time; after the low frequency, large stroke peels off the dense sand, the negative pressure adsorption during the intermittent stage can accurately recover the residual sand; the overall process does not require manual intervention, improving the cleaning efficiency and reducing the risk of sand material pollution caused by manual operation.

[0046] A turning frame 11 is installed on the casting frame 9, and two symmetrically arranged 90° turning tooth segments 12 are arranged on the tooth plate 7 and are used to drive the turning frame 11 to turn 90°. A group of 45° turning tooth segments 13 are arranged at intervals at the position corresponding to the two 90° turning tooth segments 12 on the tooth plate 7; the first 90° turning tooth segment 12 is used to pre-exclude the molding sand in the casting mold 15 before the strong cleaning state to reduce the irregular throwing rate of the molding sand; the second 90° turning tooth segment 12 is used for forced cleaning and discharge of the molding sand in the casting mold 15; a sand throwing shaft 14 driven by the synchronous shaft 10 is rotatably installed in the turning frame 11, and a casting mold 15 is installed on the sand throwing shaft 14, and a hollow flow channel connected to the inner cavity of the casting mold 15 is provided on the sand throwing shaft 14; a turning shaft is installed on the back of the turning frame 11, and a tooth sleeve 36 is rotatably provided on the turning shaft, and a linkage shaft sleeve 37 is rotatably installed on the sand vibrating frame 22. A second elastic transmission belt 38 is connected between 37 and the flip shaft, and the first elastic transmission belt 34 and the second elastic transmission belt 38 can be elastically stretched. A large square shaft 39 is rotatably installed on the mold frame 6. The interior of the linkage sleeve 37 is fixed with a fourth synchronous square groove with openings at both ends and slidably connected to the large square shaft 39. The cross-sections of the fourth synchronous square groove and the large square shaft 39 are both regular polygons; a flip gear 40 is installed at the tail end of the large square shaft 39, and the flip gear 40 is meshed and connected with the 90° flip tooth segment 12 and the 45° flip tooth segment 13. A synchronous gear 41 is installed on the synchronous shaft 10 and the gear sleeve 36, and a missing tooth bevel gear 42 is installed on the synchronous shaft 10. A full-tooth bevel gear 43 is installed on the sand-throwing shaft 14, and the missing tooth bevel gear 42 is meshed and connected with the full-tooth bevel gear 43. A second torsion spring 44 is provided at the rotation connection between the sand-throwing shaft 14 and the flip frame 11 and the rotation connection between the large square shaft 39 and the mold frame 6;

[0047] The beneficial effects of adopting the above solution are as follows. The collaborative design of the flipping gears 40, the 90° flipping tooth section 12, and the 45° flipping tooth section 13 is the core mechanical structure to achieve "phased and precise demolding". Its unique functions are reflected in three dimensions: precise angle control, phased action adaptation to the sand mold state, and synergistic enhancement with the vibration negative pressure system. The 90° flipping tooth section 12 achieves a "double insurance" of "gravity-assisted pre-discharge" and "forced cleaning" through large-angle flipping. The first 90° flipping tooth section 12 drives the mold to flip down 90° when the distance between the casting molds 15 reaches the first distance, and uses gravity to make the loose molding sand fall off naturally, reducing the scattering rate. The second 90° flipping tooth section 12 maintains the 90° flipped-down state when the distance between the casting molds 15 reaches the second distance, and cooperates with low-frequency large-stroke oscillation and micro-vibration of the magnetostrictive vibration coating 16 to peel off the strongly adhered sand in the deep layer. The 45° flipping tooth section 13 processes the residual sand through micro-amplitude oscillation. When the distance between the casting molds 15 is between the first and second distances, it drives the flipping frame 11 to reciprocally flip within 45°, and combines the "flip, pause" rhythm in the toothless area to simulate the logic of manual "light tapping, waiting, and then light tapping", and uses alternating stress and magnetostrictive micro-vibration to peel off the weakly adhered residual sand to avoid sand particle suspension. The flipping gear 40, as the core hub, realizes high-fidelity angle transmission through precise meshing with the 90° flipping tooth section 12 and the 45° flipping tooth section 13. At the same time, the second torsion spring 44 at the connection between it and the large square shaft 39 can buffer instantaneous impact and avoid gear overload fracture. The three cooperate to form a hierarchical cleaning logic of "gravity-dominated, vibration-assisted, and micro-amplitude oscillation". The inner cavity of the casting mold 15 is coated with a magnetostrictive vibration coating 16, and the magnetostrictive vibration coating 16 is excited by an alternating magnetic field generated by a magnetic field generator 8 to achieve multi-axial micro-vibration and realize the peeling of the molding sand from the casting mold 15. The magnetostrictive vibration coating 16 includes a transition layer 17, a functional layer 18, and a heat insulation layer 19 arranged in sequence from the inside to the outside.

[0048] The transition layer 17 is a nano-laminate with alternating deposition of Al2O3 and TiN. The functional layer 18 is composed of a composite of Fe 70 Ga 30 alloy nanoparticles and vertically oriented graphene. The Fe 70 Ga 30 alloy nanoparticles have a particle size of 70 nm; the interlayer spacing of the vertically oriented graphene is 0.38 nm, and Fe3C nanocrystals are embedded; the heat insulation layer 19 is a ZrO2 gradient ceramic containing an Al2O3 stabilizer; the output frequency of the magnetic field generator 8 is 1 kHz - 20 kHz, and the magnetic field strength is 0.1 T - 0.5 T; the magnetic field direction of the magnetic field generator 8 forms a 45° angle with the surface of the casting mold 15; an electric heater 21 for drying and self-peeling the molding sand is provided in the casting mold 15, and the heating temperature of the electric heater 21 is 245 °C.

[0049] The reciprocating rotation of the sand throwing shaft 14 and the periodic vibration of the casting frame 9 form a "rotary vibration" coupled motion; the reciprocating rotation of the sand throwing shaft 14 is driven by the synchronous shaft 10, and the alternating forward and reverse rotations of the synchronous shaft 10 are controlled by the system, ultimately realizing the periodic reciprocation of the sand throwing shaft 14 of "forward rotation, reverse rotation, forward rotation", which is dynamically matched with the vibration frequency of the casting frame 9 of "high frequency and small stroke, low frequency and large stroke"; during the cleaning stage, the centrifugal force generated by the rotation of the sand throwing shaft 14 and the vibration inertia force form a composite force field: during high-frequency small-stroke vibration, the small centrifugal force and the micro-amplitude inertia force cooperate to peel off the loose molding sand; during low-frequency large-stroke vibration, the large centrifugal force and the strong inertia force are superimposed, and the bonding interface of the deep-layer molding sand is destroyed through the dual effects of "rotary throwing plus vibration impact"; at the same time, the hollow flow channel inside the sand throwing shaft 14 forms a "dynamic flow channel" with the rotation: in addition, the rotation of the sand throwing shaft 14 exposes each area of the mold surface to the optimal action angle of the magnetic field generator 8 in turn, and the multi-axial micro-vibration of the magneto-vibratory coating 16 forms a dynamic angle with the tangential direction of rotation, generating a "circumferential-radial-axial" composite vibration, eliminating the peeling blind area and evenly distributing the vibration energy, and improving the peeling uniformity; toothless areas are provided at the positions on the toothed plate 7 corresponding to the 90° flipping tooth section 12, the 45° flipping tooth section 13, and between two 45° flipping tooth sections 13, and the length of the toothless area is the same as the length of the 45° flipping tooth section 13. During the casting of coated sand, the inner cavity of the casting mold 15 is filled with material through the sand feeding pipe 2. After the casting of the coated sand is completed, the two casting molds 15 move away from each other to a first distance. After reaching the first distance, the transmission shaft 5 is continuously driven, and the casting mold 15 is turned downward by 90°. When the two casting molds 15 are away from each other to a second distance, they remain turned downward by 90° and continuously oscillate with variable frequency and variable stroke. The hollow flow channel is communicated with the negative pressure sand suction pipe 3, and the magneto-vibratory coating 16 realizes the peeling of the molding sand under the coupling action of the magnetic field generator 8. When the casting mold 15 is away from each other between the first distance and the second distance, it first resets from the 90° flipping state and then reciprocates and flips within 45°. The first distance is 3 times the width of the casting mold 15, and the second distance is 6 times the width of the casting mold 15.

[0050] The magneto-vibratory coating 16 is excited by the alternating magnetic field of the magnetic field generator 8 to generate multi-axial micro-vibrations, causing the micrometer-level separation between the molding sand and the mold interface, realizing non-contact and efficient peeling; the transition layer 17 enhances the bonding force between the coating and the mold substrate, and the functional layer 18 improves the vibration uniformity through the triple mechanisms of "particle vibration, graphene vibration conduction, and embedding Fe3C nanocrystals for strengthening", while the heat insulation layer 19 blocks the heat diffusion from the mold to the coating, ensuring that the sand mold is quickly cured and the mold temperature is stable when the electric heater 21 is heating; the principle that the magneto-vibratory coating 16 is excited by the alternating magnetic field of the magnetic field generator 8 to generate multi-axial micro-vibrations lies in the magnetostrictive effect of the functional layer 18 material and the synergistic effect of the composite structure, combined with the precise regulation of the magnetic field parameters: Fe of the functional layer 18 70 Ga 30Alloy nanoparticles have a significant magnetostrictive effect. When an alternating magnetic field is applied, the internal magnetic domains in them periodically orient with the change of the magnetic field direction and intensity, resulting in the vibration of the material due to its expansion and contraction, and it can respond efficiently even at low magnetic fields; Vertically oriented graphene serves as a vibration guiding framework, and through interface coupling, the one-dimensional expansion and contraction strain of Fe 70 Ga 30 along the magnetic field direction is transmitted to the normal direction. Combining with the Fe3C nanocrystals embedded between layers, the continuous strain is converted into discrete high-frequency multi-axial micro-vibrations.

[0051] The production process of a coated sand casting production line based on an intelligent casting island includes the following steps:

[0052] SS01. Mold clamping and sand injection. The two mold frames 6 are clamped by driving the distance adjusting part 4, and the coated sand is injected into the inner cavity of the casting mold 15 under high pressure through the sand delivery pipe 2, and the electric heater 21 heats it to 245 °C to quickly cure and form the coated sand;

[0053] SS02. Mold opening and vibration peeling. The mold frame 6 first separates to the mold opening distance, and the cured and formed coated sand molded part is removed for blanking. Subsequently, the mold frame 6 separates to the first distance, and the casting mold 15 is turned downward by 90 °, and the loose molding sand falls off under the action of gravity. The transmission shaft 5 drives the casting frame 9 to vibrate periodically. Combining with the multi-axial micro-vibrations of the magneto-vibration coating 16, the deeply adhered molding sand is peeled off. The synchronous sand throwing shaft 14 rotates reciprocally, and the residual sand is cleaned up by the synergistic action of centrifugal force and vibration inertia force;

[0054] SS03. Negative pressure sand suction and flipping reset. The mold frame 6 separates to the second distance, and the casting mold 15 remains flipped at 90 ° and continues to oscillate. Combining with the micro-amplitude oscillation of the 45 ° flipping tooth section 13, the weakly adhered sand is further cleaned. The negative pressure sand suction pipe 3 adsorbs the residual sand grains through the hollow flow channel to ensure the cleanliness of the inner cavity of the mold;

[0055] SS04. Reset and cycle. The mold frame 6 resets to the initial position, and the lifting frame 45 adjusts the heights of the sand delivery pipe 2 and the negative pressure sand suction pipe 3 to prepare for the next cycle. The microcontroller coordinates the vibration frequency, magnetic field intensity and flipping angle throughout the process to achieve intelligent production.

[0056] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0057] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A shell molding sand casting production line based on an intelligent casting island, including a machine body, characterized in that: A sand delivery pipe, a negative pressure sand suction pipe, a distance adjusting member and a rotatable transmission shaft are respectively installed inside the machine body. A distance adjusting member is drivingly connected with two symmetrically arranged and distance-adjustable die carriers, and casting systems are arranged on both die carriers. The casting system includes a toothed plate installed on the machine body, a magnetic field generator installed on the machine body, a casting frame that can reciprocate synchronously back and forth and left and right on the die carrier, and a synchronous shaft that can periodically rotate forward and reverse alternately. The synchronous shaft is rotatably installed on the casting frame. When the transmission shaft works, the reciprocating frequency and reciprocating stroke of the casting frame change periodically in a cycle. A turning frame is installed on the casting frame. There are two symmetrically arranged 90° turning tooth sections on the toothed plate for driving the turning frame to turn 90°. A set of spaced 45° turning tooth sections is arranged at the position corresponding to the two 90° turning tooth sections on the toothed plate. A sand throwing shaft driven by the synchronous shaft is rotatably installed in the turning frame. A casting mold is installed on the sand throwing shaft. A hollow flow channel communicating with the inner cavity of the casting mold is arranged on the sand throwing shaft. The inner cavity of the casting mold is coated with a magneto-vibratory coating. The magneto-vibratory coating is excited by an alternating magnetic field to generate multi-axial micro-vibrations to realize the separation of the molding sand from the casting mold. The magneto-vibratory coating includes a transition layer, a functional layer and a heat insulation layer arranged in sequence from the inside to the outside.

2. The coated sand casting production line based on the intelligent casting island according to claim 1, characterized in that: A microcontroller is installed on the end face of the machine body. A box door is arranged in the middle of the machine body. A sand collecting cavity with an open top is arranged inside the machine body at a position corresponding to the lower part of the casting mold. A first driving motor is installed on the side of the machine body. The output shaft end of the first driving motor is fixedly connected with the transmission shaft. An electric heater for drying and self-separating the molding sand is arranged in the casting mold. The heating temperature of the electric heater is 220°C - 260°C.

3. The coated sand casting production line based on the intelligent casting island according to claim 1, characterized in that: The distance adjusting member includes a clamping lead screw rotatably connected inside the machine body. A second driving motor is installed on the side of the machine body. The output shaft end of the second driving motor is fixedly connected with the clamping lead screw. A positive thread section and a reverse thread section are symmetrically arranged on the clamping lead screw. The positive thread section and the reverse thread section are respectively drivingly connected with the two die carriers.

4. The coated sand casting production line based on the intelligent casting island according to claim 1, characterized in that: The mold frame is rotatably installed with a vibrating sand frame, a middle shaft, a small square shaft, a transverse screw and a hollow rotating sleeve, the hollow rotating sleeve is driven by a transmission shaft, the hollow rotating sleeve and the middle shaft are both equipped with a first bevel gear, the two first bevel gears are orthogonally meshed, a synchronous toothed belt is connected between the small square shaft and the transverse screw, the vibrating sand frame is rotatably installed with a wheel axle, a longitudinal screw, a first rotating sleeve linked with the middle shaft and a second rotating sleeve linked with the small square shaft, the first rotating sleeve is respectively equipped with a toothless large gear and a toothless small gear, the first rotating sleeve is respectively equipped with two symmetrically arranged meshing interruption areas on the first rotating sleeve and corresponding to the position between the toothless large gear and the toothless small gear, the toothless large gear has teeth meshing The center angle corresponding to the segment is 180°, the center angle corresponding to the toothed meshing segment of the toothless pinion is 120°, and the center angles corresponding to the two meshing interruption zones are both 30°. Two full-tooth gears are installed on the second rotating sleeve, and the two full-tooth gears are respectively meshed with the toothless large gear and the toothless pinion. Second bevel gears are installed on the wheel axle and the longitudinal screw rod, and the two second bevel gears are orthogonally meshed. The longitudinal screw rod is transmission-connected to the casting frame, and the first rotating sleeve is transmission-connected with the first elastic transmission belt, and the wheel axle and the synchronous shaft are transmission-connected with the first elastic transmission belt. The rotation connection between the transverse screw rod and the mold frame and the rotation connection between the longitudinal screw rod and the vibrating sand frame are both provided with a first torsion spring.

5. The coated sand casting production line based on the intelligent casting island according to claim 4, characterized in that: The hollow rotating sleeve is fixedly provided with a first synchronous square groove with two ends penetrating therethrough and slidably connected to the transmission shaft; the first rotating sleeve is fixedly provided with a second synchronous square groove with two ends penetrating therethrough and slidably connected to the square shaft; the second rotating sleeve is fixedly provided with a third synchronous square groove with two ends penetrating therethrough and slidably connected to the small square shaft; the cross-sections of the first synchronous square groove, the second synchronous square groove, the third synchronous square groove, the transmission shaft, the square shaft and the small square shaft are all regular polygons.

6. The coated sand casting production line based on the intelligent casting island according to claim 5, characterized in that: A turning shaft is installed on the back of the turning frame, a gear sleeve is provided on the turning shaft, and a linkage sleeve is rotatably installed on the sand vibrating frame, a second elastic transmission belt is transmission-connected between the linkage sleeve and the turning shaft, and the first elastic transmission belt and the second elastic transmission belt can be elastically stretched, a large square shaft is rotatably installed on the mold frame, and a fourth synchronous square groove with openings at both ends is fixedly opened inside the linkage sleeve and is slidably connected to the large square shaft, the cross-sections of the fourth synchronous square groove and the large square shaft are both regular polygons, and a turning gear is installed on the tail end of the large square shaft, and the turning gear is meshed with the 90° turning tooth segment and the 45° turning tooth segment, and synchronous gears are installed on the synchronous shaft and the gear sleeve, a toothless bevel gear is installed on the synchronous shaft, and a full-tooth bevel gear is installed on the sand-throwing shaft, and the toothless bevel gear is meshed with the full-tooth bevel gear, and a second torsion spring is provided at the rotating connection between the sand-throwing shaft and the turning frame and the rotating connection between the large square shaft and the mold frame.

7. The coated sand casting production line based on the intelligent casting island according to claim 1, wherein: A lifting frame is arranged inside the machine body. A group of lifting push rods are installed between the lifting frame and the machine body. The sand feeding pipe and the negative pressure sand suction pipe are both installed on the lifting frame. An upper connector is installed on the sand feeding pipe and the negative pressure sand suction pipe at positions corresponding to the two casting systems. A sand feeding joint is installed in the middle of the sand feeding pipe, and a negative pressure joint is installed in the middle of the negative pressure sand suction pipe. A lower connector adapted to be connected with the upper connector is installed on the mold frame. An annular cavity communicated with the hollow flow channel is fixedly formed on the turnover frame. A corrugated metal conduit is communicated between the lower connector and the annular cavity.

8. The coated sand casting production line based on the intelligent casting island according to claim 1, wherein: The transition layer is a nano-laminate with alternating deposition of Al2O3 and TiN, and the functional layer is composed of a composite of Fe 70 Ga 30 alloy nanoparticles and vertically oriented graphene. The Fe 70 Ga 30 alloy nanoparticles have a particle size of 50 nm - 80 nm, the layer spacing of the vertically oriented graphene is 0.36 nm - 0.40 nm, and Fe3C nanocrystals are embedded therein. The heat insulation layer is a ZrO2 gradient ceramic containing a Y2O3 stabilizer. The output frequency of the magnetic field generator is 1 kHz - 20 kHz, the magnetic field strength is 0.1 T - 0.5 T, and the magnetic field direction forms an angle of 30° - 60° with the surface of the casting mold.

9. The coated sand casting production line based on the intelligent casting island according to claim 1, characterized in that: An untoothed area is arranged between adjacent 90° turnover tooth segments and between adjacent 45° turnover tooth segments on the toothed plate. The length of the untoothed area is the same as that of the 45° turnover tooth segment. During the coated sand casting, the inner cavity of the casting mold is filled with material through the sand feeding pipe. After the coated sand casting is completed, the two casting molds move away from each other to a first distance. After reaching the first distance, the transmission shaft is continuously driven, and the casting mold is turned downward by 90°. When the two casting molds move away to a second distance, they keep turning downward by 90° and continuously oscillate with variable frequency and variable stroke. The hollow flow channel is communicated with the negative pressure sand suction pipe, and the magnetostrictive vibration coating realizes sand stripping under the coupling action of the magnetic field generator. When the casting mold moves away between the first distance and the second distance, it first resets from the 90° turnover state and then reciprocally turns within 45°. The first distance is 3 times the width of the casting mold, and the second distance is 6 times the width of the casting mold.

10. The production process of the coated sand casting production line based on the intelligent casting island according to any one of claims 1-9, characterized in that, It includes the following steps: SS01. Mold closing and sand injection: Drive the two mold frames to close the mold through the distance adjusting part. The sand feeding pipe injects the coated sand into the inner cavity of the casting mold under high pressure. The electric heater heats it to 220°C - 260°C to quickly solidify and form the coated sand. SS02. Mold opening and vibration stripping: The mold frames are first separated to the mold opening distance, and the solidified and formed coated sand formed parts are removed for blanking. Then the mold frames are separated to the first distance, and the casting mold is turned downward by 90°. The loose molding sand falls off under the action of gravity. The transmission shaft drives the casting frame to vibrate periodically, combined with the multi-axial micro-vibration of the magnetostrictive vibration coating, to strip the deeply adhered molding sand. The synchronous sand throwing shaft rotates reciprocally to clean the residual sand by using the centrifugal force and the vibration inertia force in a coordinated manner. SS03. Negative pressure sand suction and turnover reset: The mold frames are separated to the second distance, and the casting mold keeps turning by 90° and continuously oscillates, combined with the micro-amplitude oscillation of the 45° turnover tooth segment, to further clean the weakly adhered sand. The negative pressure sand suction pipe adsorbs the residual sand grains through the hollow flow channel to ensure the cleanliness of the inner cavity of the mold. SS04. Reset and cycle: The mold frames are reset to the initial position, and the lifting frame adjusts the heights of the sand feeding pipe and the negative pressure sand suction pipe to prepare for the next cycle. The microcontroller coordinates the vibration frequency, magnetic field strength, and turnover angle throughout the process to achieve intelligent production.

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