A sand mixing machine for casting sand

Abstract

The present invention relates to the field of sand mixing technology, and specifically to a sand mixing machine for foundry sand, comprising: a sand mixing bin, a mixing mechanism for mixing the sand in the sand mixing bin, and a feeding mechanism for feeding the sand in the sand mixing bin. The sand mixing machine for foundry sand of the present invention is configured such that a material-dispensing paddle is inserted into the interior of the material in the sand mixing bin, allowing an adhesive to be directly injected into the material matrix. During the circumferential rotation of the material-dispensing component along the sand mixing bin, the material is subjected to three-dimensional shearing and stirring, thereby enhancing the macroscopic mixing effect. Secondly, by deeply embedding the material for addition, the adhesive is prevented from being exposed on the material surface, thereby suppressing dust generation at the source. In addition, this addition method can achieve uniform dispersion of the adhesive in the material matrix, significantly shorten the mixing cycle, and effectively prevent chemical phase changes in the sand caused by temperature increases due to excessive stirring.

Description

Technical Field

[0001] The invention relates to the technical field of sand mixing, in particular to a sand mixing machine for casting sand. Background Art

[0002] Sand mixers are critical equipment in the foundry industry for uniformly mixing raw materials such as molding sand and adhesives. Early systems primarily relied on mechanical compaction, which limited efficiency and uniformity. With technological advancements, rotor differential sand mixing technology has improved mixing efficiency, and the technology has gradually evolved towards automation and intelligentization. Current equipment now enables high-precision mixing and real-time process control, becoming a key component in ensuring casting quality.

[0003] In the sand mixing process, in order to improve the strength of the mixed sand, the molding sand is divided into dry mixing and wet mixing. Dry mixing refers to the process of preliminarily mixing solid materials (raw sand, bentonite, coal powder, used sand, etc.) by mechanical force without the participation of liquid medium.

[0004] Wet mixing is the process of gradually adding liquid medium (water, resin solution, curing agent, etc.) to the dry-mixed sand, forming a bonding film on the surface of the sand through mechanical stirring, and further enhancing the mixing uniformity.

[0005] Patent application number 202411315585.6 discloses a sand mixing machine with adjustable sand output flow rate, which relates to the field of sand mixing, including a base plate, the top of the base plate is evenly provided with supporting feet, the top of the supporting feet is fixedly connected to a placing platform, the top of the placing platform is fixedly connected to a sand mixing bin, the inner wall of the sand mixing bin is rotatably connected to a grinding mechanism, the top of the sand mixing bin is fixedly connected to a lower slide plate, the bottom of the sand mixing bin is fixedly connected to the sand discharging mechanism, and the outer surface of the sand mixing bin is fixedly connected to an auxiliary mechanism, the end of the base plate close to the sand discharging mechanism is fixedly connected to a sand collecting plate, the top of the base plate is fixedly connected to a main motor, and the output end of the main motor is fixedly connected to a speed changing device. After the sand and gravel raw materials are poured into the sand mixing bin, the main motor will drive the grinding mechanism to rotate through the speed changing device, and then mix the raw materials. After mixing for a period of time, the rotation will stop. At this time, the auxiliary mechanism will flip the raw materials, and finally flow into the sand collecting plate through sand discharge.

[0006] However, this patent does not distinguish between dry mixing and wet mixing when mixing sand, which results in large amounts of smoke and dust from the powdered raw materials during dry mixing, causing air pollution and harming the health of operators.

[0007] Therefore, it is necessary to provide a new technical solution to overcome the above-mentioned defects. Summary of the Invention

[0008] The object of the present invention is to provide a sand mixing machine for foundry sand which can effectively solve the above-mentioned technical problems.

[0009] In order to achieve the purpose of the present invention, the following technical solutions are adopted:

[0010] A sand mixing machine for casting sand comprises: a sand mixing bin, a mixing mechanism for mixing the sand in the sand mixing bin, and a discharge mechanism for discharge the sand in the sand mixing bin;

[0011] The mixing mechanism includes: a driving motor fixedly mounted on the bottom of the sand mixing bin, a driving rod fixed to the motor conveying shaft, a driving plate fixedly connected to the driving rod, a stirring paddle rotatably mounted on the driving plate, and a driving assembly that drives the stirring paddle to rotate as the driving plate rotates;

[0012] The driving assembly includes: an inner gear ring fixedly mounted on the sand mixing bin, a gear 1 meshing with the inner gear ring, the gear 1 being synchronously connected to the stirring paddle through a synchronizing member; and the gear 1 being rotatably mounted on the driving plate.

[0013] Furthermore, a scraping rod is fixedly mounted on the driving rod; the scraping rod is located at the bottom of the sand mixing bin.

[0014] Furthermore, the driving plate is also provided with a feeding component for feeding the adhesive during stirring;

[0015] The unloading assembly includes: a mounting plate hinged on the driving plate, a material-discharging paddle fixedly mounted on the mounting plate, an upper hopper fixedly mounted on the driving plate, and a swing assembly that drives the stirring paddle to swing; a material trough is provided in the material-discharging paddle, and the upper hopper is connected to the material-discharging paddle through a hose.

[0016] Furthermore, a plurality of groups of material-diverting paddles are equidistantly provided on the mounting plate, and the material-diverting paddles are composed of a material-diverting end and a material-discharging end; the material-diverting end is a convex block with a raised middle portion; and the material-discharging end is a material trough provided on the back of the convex block.

[0017] Furthermore, the swing assembly includes: a second gear rotatably mounted on the driving plate, a shift plate coaxially fixedly connected to the second gear, and a spring that drives the mounting plate to reset.

[0018] Furthermore, the swing assembly further comprises: an anti-blocking assembly for preventing the trough from being blocked;

[0019] The anti-blocking component includes: a poking pin slidably installed in the material paddle trough, a fixing rod fixedly connected to the poking pin, and a spring 2 fixedly installed between the poking pin and the driving plate.

[0020] Furthermore, the driving plate is also provided with a cylinder for driving the mounting plate to flip, and the paddle is provided with a water outlet; the mounting plate is located on the extension stroke of the cylinder.

[0021] Furthermore, a stirring assembly is provided in the upper hopper;

[0022] The stirring assembly includes: a bevel gear 1 coaxially arranged with the gear 2, a bevel gear 2 meshing with the bevel gear 1, and a mixing roller coaxially fixedly connected with the bevel gear 2; the mixing roller is rotatably installed in the upper hopper.

[0023] Furthermore, the feeding mechanism includes: a feeding port opened on the side wall of the sand mixing bin, a blocking plate for blocking the feeding port, and an electric push rod for driving the blocking plate to move; the piston rod of the electric push rod is fixedly connected to the blocking plate.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention provides a sand mixing machine for foundry sand. A paddle assembly is inserted into the mixing chamber, allowing adhesive to be directly injected into the material matrix. As the paddle assembly rotates circumferentially around the mixing chamber, it agitates the material in three dimensions, enhancing the macroscopic mixing effect. Furthermore, deep-buried addition prevents the adhesive from being exposed on the material surface, fundamentally suppressing dust generation. Furthermore, this addition method ensures uniform dispersion of the adhesive within the material matrix, significantly shortening the mixing cycle and effectively preventing chemical phase changes in the sand caused by elevated temperatures due to excessive mixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0027] Figure 1 This is a schematic structural diagram of a sand mixing machine for casting sand according to the present invention;

[0028] Figure 2 A cross-sectional view of a sand mixing machine for casting sand according to the present invention;

[0029] Figure 3 Schematic diagram of the structure of the mixing mechanism of the present invention;

[0030] Figure 4 for Figure 3 Schematic diagram of the structure of part A;

[0031] Figure 5 A top view of the mixing mechanism of the present invention;

[0032] Figure 6 It is a structural schematic diagram of the blanking component in the present invention;

[0033] Figure 7 Schematic diagram of the structure of the anti-blocking component in the present invention;

[0034] Figure 8 It is a structural schematic diagram of the blanking mechanism in the present invention.

[0035] In the figure: 1. Sand mixing bin; 2. Mixing mechanism; 3. Unloading mechanism; 21. Driving motor; 22. Driving rod; 23. Driving plate; 24. Stirring paddle; 251. Internal gear ring; 252. Gear 1; 253. Synchronous member; 254. Scraper rod; 261. Mounting plate; 262. Paddle; 263. Upper hopper; 2621. Material trough; 2622. Hose; 2623. Bump; 2631. Gear 2; 2632. Paddle; 2633. Spring 1; 2634. Ejector pin; 2635. Fixing rod; 2636. Spring 2; 2625. Cylinder; 2624. Water outlet; 2611. Bevel gear 1; 2612. Bevel gear 2; 2613. Mixing roller; 32. Blocking plate; 33. Electric push rod. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0037] In the description of the present invention, it should be understood that the terms "center", "transverse", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention. When a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a centered component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centered component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a centered component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0038] like Figures 1 to 8 As shown, the present invention is a sand mixing machine for casting sand, comprising: a sand mixing bin 1, a mixing mechanism 2 for mixing the sand in the sand mixing bin 1, and a discharge mechanism 3 for discharge the sand in the sand mixing bin 1;

[0039] When the molding sand needs to be mixed, the staff pours the molding sand raw materials, adhesives, etc. into the sand mixing bin 1 in sequence, then starts the mixing mechanism 2 to stir and mix the molding sand in the sand mixing bin 1, and finally discharges the mixed molding sand in the sand mixing bin 1 through the discharge mechanism 3;

[0040] Here, the preferred composition of the molding sand raw materials is: for example, for iron castings: 100% raw sand, 6%-8% bentonite, 4%-6% coal powder, and 4%-5% water; high-precision castings require additional α-starch (0.3%-0.5%) to improve collapsibility;

[0041] The preferred order of adding materials is: first add 70% old sand + 30% new sand and premix for 1 minute, then add adhesive and dry mix for 2 minutes, and finally add the remaining water and additives in batches and wet mix for 3-5 minutes;

[0042] Dry mixing and wet mixing are carried out in steps to avoid the adhesive from directly contacting with water to form lumps and ensure uniform coating.

[0043] The mixing mechanism 2 includes: a driving motor 21 fixedly mounted on the bottom of the sand mixing bin 1, a driving rod 22 fixed to the motor conveying shaft, a driving plate 23 fixedly connected to the driving rod 22, a stirring paddle 24 rotatably mounted on the driving plate 23, and a driving assembly that drives the stirring paddle 24 to rotate as the driving plate 23 rotates;

[0044] The driving assembly includes: an inner gear ring 251 fixedly mounted on the sand mixing bin 1, a gear 1 252 meshing with the inner gear ring 251, and the gear 1 252 is synchronously connected to the stirring paddle 24 via a synchronizer 253; the gear 1 252 is rotatably mounted on the driving plate 23.

[0045] When the molding sand in the sand mixing bin 1 needs to be stirred, the driving motor 21 is started, and the driving motor 21 drives the driving rod 22 and the driving plate 23 fixedly mounted on the driving rod 22 to rotate. When the driving plate 23 rotates, the gear 1 252 mounted on the driving plate 23 rotates under the engagement of the inner gear ring 251. When the gear 1 252 rotates, the stirring paddle 24 rotates synchronously under the action of the synchronous member 253, so that the sand and gravel in the sand mixing bin 1 rotate while being stirred in orbit, forming a three-dimensional shear flow field between the mixed sand and gravel particles, thereby greatly enhancing the mixing effect and shortening the mixing time. It should be noted here that the synchronous member 253 is preferably a synchronous belt or a sprocket.

[0046] A scraper rod 254 is also fixedly mounted on the driving rod 22; the scraper rod 254 is located at the bottom of the sand mixing bin 1; when the driving motor 21 drives the driving rod 22 to rotate, the scraper rod 254 is also driven to rotate synchronously, thereby stirring the sand and gravel in the dead corner at the bottom, and at the same time preventing the sand and gravel from adhering to the bottom of the sand mixing bin 1, thereby affecting the material discharge efficiency.

[0047] The driving plate 23 is also provided with a feeding component for feeding the adhesive during stirring;

[0048] The unloading assembly includes: a mounting plate 261 hinged to the driving plate 23, a paddle 262 fixedly mounted on the mounting plate 261, an upper hopper 263 fixedly mounted on the driving plate 23, and a swing assembly for driving the stirring paddle 24 to swing; a material trough 2621 is defined in the paddle 262, and the upper hopper 263 is connected to the paddle 262 via a hose 2622;

[0049] When adhesive dry materials such as bentonite and pulverized coal need to be added to the mixing bin 1, the operator places the materials into the upper hopper 263. Driven by the drive mechanism, the drive plate 23 drives the mounting plate 261 via a coupling device to achieve synchronous rotation. The paddle 262, hinged to the mounting plate 261, is adjusted to a position perpendicular to the axis of the mixing bin 1. As the mounting plate 261 drives the paddle assembly to perform planetary motion within the mixing bin 1, the adhesive in the upper hopper 263 is quantitatively introduced into the collection trough 2621 of the paddle 262 via a flexible conveying pipe. The orbital motion of the paddle 262 along the mixing bin 1 enables the targeted addition of adhesive from the collection trough 2621 to the material within the mixing bin 1.

[0050] It should be noted that the traditional dosing method has significant defects: since bentonite and coal powder adhesives are in powder form, the conventional feeding mechanism 3 directly feeds them into the surface layer of the sand mixing bin 1, resulting in the powdered materials generating aerosol dust under the shearing action of the blades during the mixing operation, threatening the respiratory health of the operators.

[0051] This device inserts a paddle 262 into the material in the mixing bin 1, injecting the adhesive directly into the material matrix. As the paddle assembly rotates circumferentially around the mixing bin 1, it agitates the material in three dimensions, enhancing the macroscopic mixing effect. Furthermore, by deeply embedding the material, the adhesive is prevented from being exposed on the material surface, fundamentally suppressing dust generation. Furthermore, this dosing method ensures uniform dispersion of the adhesive within the material matrix, significantly shortening the mixing cycle and effectively preventing chemical phase changes in the sand caused by elevated temperatures due to excessive agitation.

[0052] The mounting plate 261 is provided with multiple sets of paddles 262 at equal intervals. The paddles 262 are composed of a paddle end and a discharge end. The paddle end is a raised block 2623 in the middle. The discharge end is a trough 2621 provided on the back of the block 2623.

[0053] What is explained in detail here is that the paddle rotates under the drive of the motor. The paddle end of the paddle, by virtue of its convex structure, exerts a force on the raw materials in the sand mixing bin 1, so that the raw materials are dispersed and form a feeding channel. Subsequently, the raw materials are quickly discharged through the material trough 2621 and accurately enter the feeding channel. During the continuous rotation of the stirring rod, the adhesive that has been discharged into the channel will be covered by the subsequent falling raw materials. This structural design effectively avoids the dust problem caused by the stirring operation when the raw materials fall directly to the surface of the accumulated raw materials, thereby improving the stability and environmental friendliness of the entire process.

[0054] The swing assembly includes: a second gear 2631 rotatably mounted on the driving plate 23, a shift plate 2632 coaxially fixedly connected to the second gear 2631, and a first spring 2633 for driving the mounting plate 261 to return to its original position;

[0055] When the motor drives the driving plate 23 to rotate around its axis, the gear 2 2631 rotates under the driving action of the meshing inner gear ring 251. Since the gear 2 2631 is rigidly connected to the shift plate coaxially, the rotation of the gear 2 2631 will synchronously drive the shift plate to rotate around the same axis.

[0056] During the rotation of the paddle plate 2632, the wave plate 2632 contacts the lower half of the paddle, and its convex surface abuts the paddle on the mounting plate 261. Based on the principle of force transmission and leverage, this abutting force drives the mounting plate 261 to deflect about its hinge point with the drive plate 23. As the mounting plate continues to rotate, when the lower half of the paddle plate ends its abutment with the mounting plate 261, spring 1 2633 releases its elastic potential energy, generating a restoring force, which in turn drives the mounting plate 261 to deflect in the opposite direction, achieving a reset action. It should be noted that an axial buffer is provided at the hinged joint between the mounting plate and the drive plate to abut the axial travel of the mounting plate caused by the paddle plate during rotation. The specific structure can be a gap for axial movement on the hinge axis where the mounting plate is hinged to the drive plate, and a reset spring to drive the mounting plate back to its original position.

[0057] As the mounting plate 261 reciprocates, the paddle 262, fixed to the mounting plate 261, simultaneously oscillates. Driven by the motor, the paddle 262 simultaneously rotates and oscillates. This allows the paddle 262 to precisely deposit adhesive at varying depths within the raw material layer of the sand mixing bin 1, effectively increasing the contact area and mixing degree between the adhesive and the material, significantly improving the efficiency and quality of the subsequent mixing process by the agitator 24.

[0058] The swing assembly further includes: an anti-blocking assembly for preventing the trough 2621 from being blocked;

[0059] The anti-blocking assembly includes: a material-poking ejector pin 2634 slidably mounted in the material trough 2621 of the material-poking paddle 262, a fixing rod 2635 fixedly connected to the material-poking ejector pin 2634, and a second spring 2636 fixedly mounted between the material-poking ejector pin 2634 and the driving plate 23;

[0060] As the paddle 262 swings, spring 2636 generates an elastic restoring force due to tension or compression deformation. This restoring force acts on the fixed rod 2635, thereby driving the fixed rod 2635 and the ejector pin 2634 thereon to reciprocate along the axis of the trough 2621. During this movement, the ejector pin 2634 exerts force on the adhesive accumulated at the discharge port of the trough 2621, dispersing and stirring it, thereby effectively preventing the adhesive from clumping or hardening within the trough 2621, ensuring unobstructed discharge and maintaining stable discharge efficiency.

[0061] It should be added here that the second spring 2636 can be replaced by a connecting rod; it can also drive the ejector pin 2634 to slide in the material trough 2621 when the material paddle 262 swings.

[0062] The driving plate 23 is further provided with a cylinder 2625 for driving the mounting plate 261 to turn over, and the paddle 262 is provided with a water outlet 2624; the mounting plate 261 is located on the extension stroke of the cylinder 2625;

[0063] After the mixing mechanism 2 completes the dry mixing of the raw sand and adhesive, the operator injects a fixed amount of clean water into the upper hopper 263. At this point, the control system drives the piston rod of the cylinder 2625 to extend. During this extension, the piston rod mechanically contacts the mounting plate 261, causing the mounting plate 261 to pivot upward about its hinge point with the fixed structure, thereby moving the paddle 262 away from the dry-mixed sand pile.

[0064] In this state, the clean water in the upper hopper 263 is transported through the flexible water pipeline to the interior of the material trough 2621 of the material diverting paddle 262, and is evenly sprayed onto the surface of the dry mixed sand through the water outlet holes preset on the surface of the material diverting paddle 262. At the same time, the stirring paddle 24 starts and rotates to wet mix the soaked sand.

[0065] It should be noted that when the cylinder 2625 drives the paddle 262 to complete the flipping action, the ejector pin 2634 provided in the trough 2621 automatically presses against the discharge end of the trough 2621 under the elastic restoring force of the spring 2 2636, forming a mechanical sealing structure; this structure ensures that clean water flows out only through the water outlet hole on the surface of the paddle 262, thereby effectively reducing the water flow rate, and flushing and cleaning the adhesive remaining on the upper hopper 263 and the inner wall of the water supply pipeline during the dry mixing stage, avoiding pipeline blockage or uneven mixing problems caused by adhesive residue.

[0066] As an extension of this solution, the water outlet can be directly connected to the piping system of an external booster water pump. By adjusting the water pump output pressure to meet the water pressure requirements under different working conditions, the wet mixing efficiency can be further improved.

[0067] It is important to emphasize that the paddle 262 is rotated by the cylinder 2625. On the one hand, after the paddle 262 is rotated, its water outlet is precisely located directly above the sand pile. As the motor drives the paddle 262 to rotate, clean water evenly covers the surface of the sand, significantly improving the wet mixing effect and reducing the energy consumption and time costs of the subsequent mixing process. On the other hand, after the paddle 262 is rotated, it is moved away from the sand pile, effectively preventing the sand from adhering to the surface of the paddle 262 during the wet mixing process, thereby preventing the sand from entering the trough 2621 and causing blockage, thereby ensuring the stability and production efficiency of the continuous dry-wet mixing operation.

[0068] The upper hopper 263 is also provided with a stirring assembly;

[0069] The stirring assembly includes: a bevel gear 1 2611 coaxially arranged with the gear 2 2631, a bevel gear 2612 meshing with the bevel gear 1 2611, and a mixing roller 2613 coaxially fixedly connected with the bevel gear 2 2612; the mixing roller 2613 is rotatably installed in the upper hopper 263;

[0070] As the motor drives the driving plate 23 to rotate, the gear 2 2631 rotates synchronously, the gear 2 2631 rotates through the transmission bevel gear 1 2611, and the bevel gear 2 26122 synchronously drives the mixing roller 2613 to rotate, mixing the materials in the upper hopper 263, thereby preventing the materials from agglomerating in the upper hopper 263 and causing the problem of material blockage.

[0071] The feeding mechanism 3 includes: a feeding port opened on the side wall of the sand mixing bin 1 , a blocking plate 32 for blocking the feeding port, and an electric push rod 33 for driving the blocking plate 32 to move; the piston rod of the electric push rod 33 is fixedly connected to the blocking plate 32 .

[0072] When the materials in the sand mixing bin 1 are mixed, the electric push rod 33 drives the blocking plate 32 away from the discharge port on the sand mixing bin 1, and the mixed molding sand in the sand mixing bin 1 is discharged from the discharge port.

[0073] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology. It will not be described in detail here. The content not described in detail in this specification belongs to the existing technology known to professional and technical personnel in this field.

[0074] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A sand mixing machine for foundry sand, characterized in that: include: Sand mixing bin, a mixing mechanism for mixing the molding sand in the sand mixing bin, and a discharge mechanism for discharge the molding sand in the sand mixing bin; The mixing mechanism includes: a driving motor fixedly mounted on the bottom of the sand mixing bin, a driving rod fixed to the motor conveying shaft, a driving plate fixedly connected to the driving rod, a stirring paddle rotatably mounted on the driving plate, and a driving assembly that drives the stirring paddle to rotate as the driving plate rotates; The driving assembly includes: an inner gear ring fixedly mounted on the sand mixing bin, a gear 1 meshing with the inner gear ring, the gear 1 being synchronously connected to the stirring paddle via a synchronizing member; the gear 1 being rotatably mounted on the driving plate; The driving plate is also provided with a feeding component for feeding the adhesive during stirring; The unloading assembly includes: a mounting plate hinged on the driving plate, a paddle fixedly mounted on the mounting plate, an upper hopper fixedly mounted on the driving plate, and a swing assembly for driving the stirring paddle to swing; a material trough is provided in the paddle, and the upper hopper is connected to the paddle through a hose; The swing assembly includes: a second gear rotatably mounted on the driving plate, a shift plate coaxially fixedly connected to the second gear, and a first spring for driving the mounting plate to return to its original position.

2. A sand mixing machine for foundry sand according to claim 1, characterized in that: A scraping rod is also fixedly mounted on the driving rod; the scraping rod is located at the bottom of the sand mixing bin.

3. A sand mixing machine for foundry sand according to claim 2, characterized in that: The mounting plate is provided with a plurality of groups of material-diverting paddles at equal intervals, and the material-diverting paddles are composed of a material-diverting end and a material-discharging end; the material-diverting end is a convex block with a raised middle portion; and the material-discharging end is a material trough provided on the back of the convex block.

4. A sand mixing machine for foundry sand according to claim 1, characterized in that: The swing assembly further includes: an anti-blocking assembly for preventing clogging of the trough; The anti-blocking component includes: a poking pin slidably installed in the material paddle trough, a fixing rod fixedly connected to the poking pin, and a spring 2 fixedly installed between the poking pin and the driving plate.

5. A sand mixing machine for foundry sand according to claim 4, characterized in that: The driving plate is also provided with a cylinder for driving the mounting plate to turn over, and the paddle is provided with a water outlet; the mounting plate is located on the stroke of the cylinder extending.

6. A sand mixing machine for foundry sand according to claim 5, characterized in that: A stirring component is also provided in the upper hopper; The stirring assembly includes: a bevel gear 1 coaxially arranged with the gear 2, a bevel gear 2 meshing with the bevel gear 1, and a mixing roller coaxially fixedly connected with the bevel gear 2; the mixing roller is rotatably installed in the upper hopper.

7. A sand mixing machine for foundry sand according to claim 1, characterized in that: The material discharge mechanism includes: a material discharge port opened on the side wall of the sand mixing bin, a material blocking plate for blocking the material discharge port, and an electric push rod for driving the material blocking plate to move; the piston rod of the electric push rod is fixedly connected to the material blocking plate.

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