Sand mixer for molding sand for casting

Abstract

The invention relates to the technical field of sand mixing, in particular to a sand mixing machine for molding sand for casting, which comprises a sand mixing bin, a mixing mechanism for mixing the molding sand in the sand mixing bin, and a discharging mechanism for discharging the molding sand in the sand mixing bin, according to the sand mixing machine for the molding sand for casting, the material stirring paddle is inserted into materials in the sand mixing bin, so that an adhesive is directly injected into a material base body; in the process that the material stirring assembly rotates in the circumferential direction of the sand mixing bin, on one hand, materials are subjected to three-dimensional shearing stirring, and the macroscopic mixing effect is enhanced; and secondly, the adhesive is prevented from being exposed on the surface of the material by deeply burying and adding the material, so that the generation of flying dust is inhibited from the source. Besides, the addition mode can realize uniform dispersion of the adhesive in a material matrix, so that the mixing period is remarkably shortened, and chemical phase change caused by temperature rise due to excessive stirring of the gravels is effectively prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of sand mixing, and particularly relates to a sand mixing machine for molding sand used in casting. Background Art

[0002] The sand mixer is a key equipment in the casting industry for uniformly mixing raw materials such as molding sand and adhesives. In the early stage, it was mainly mechanical rolling type, with limited efficiency and uniformity; with the development of the process, the rotor differential sand mixing technology has improved the mixing effect and gradually evolved towards automation and intelligence. Currently, the equipment can achieve high-precision proportioning and real-time process control, becoming the core equipment to ensure the quality of castings.

[0003] In the sand mixing process, in order to improve the strength of the molding sand after mixing, the molding sand is divided into dry mixing and wet mixing; dry mixing refers to the process of initially mixing solid materials (such as raw sand, bentonite, pulverized coal, used sand, etc.) by mechanical force without the participation of liquid media. Wet mixing is the process of gradually adding liquid media (such as water, resin solution, curing agent, etc.) to the sand material after dry mixing, and forming a bonding film on the surface of the sand grains through mechanical stirring to further enhance the mixing uniformity.

[0004] Patent Application No. 202411315585.6 discloses a sand mixing machine with adjustable sand discharge flow rate, which relates to the field of sand mixing. It includes a bottom plate, on the top of which support feet are evenly arranged. The top of the support feet is fixedly connected with a placement platform, and the top of the placement platform is fixedly connected with a sand mixing bin. The inner wall of the sand mixing bin is rotationally connected with a sand grinding mechanism. The top of the sand mixing bin is fixedly connected with a downward sliding plate, and the bottom of the sand mixing bin is fixedly connected with a sand discharging mechanism. The outer surface of the sand mixing bin is fixedly connected with an auxiliary mechanism. One end of the bottom plate close to the sand discharging mechanism is fixedly connected with a sand receiving plate, and a main motor is fixedly connected to the top of the bottom plate. The output end of the main motor is fixedly connected with a speed change device. After pouring the sand and stone raw materials into the sand mixing bin, the main motor will drive the sand grinding mechanism to rotate through the speed change device, thereby mixing the raw materials. After mixing for a period of time, it will stop rotating. At this time, the auxiliary mechanism will turn over the raw materials, and finally flow out through the sand discharge and fall onto the sand receiving plate.

[0005] However, when mixing sand in this patent, it does not distinguish between dry mixing and wet mixing, resulting in a large amount of dust caused by powdery raw materials during dry mixing, causing air pollution and harming the physical health of operators.

[0006] Therefore, it is necessary to provide a new technical solution to overcome the above defects. Summary of the Invention

[0007] The purpose of the present invention is to provide a sand mixing machine for molding sand used in casting that can effectively solve the above technical problems.

[0008] To achieve the object of the present invention, the following technical solutions are adopted: 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 mixing mechanism includes: a driving motor fixedly installed at the bottom of the sand mixing bin, a driving rod fixed to the motor transmission shaft, a driving plate fixedly connected to the driving rod, a stirring paddle rotatably installed on the driving plate, and a driving component for driving the stirring paddle to rotate as the driving plate rotates. The driving component includes: an internal gear ring fixedly installed on the sand mixing bin, a first gear meshing with the internal gear ring, and the first gear is synchronously connected to the stirring paddle through a synchronizing member; the first gear is rotatably installed on the driving plate.

[0009] Furthermore, a scraping rod is also fixedly installed on the driving rod; the scraping rod is located at the bottom of the sand mixing bin.

[0010] Furthermore, a feeding component for feeding the adhesive during stirring is also provided on the driving plate. The feeding component includes: a mounting plate hinged to the driving plate, a feeding paddle fixedly installed on the mounting plate, a feeding hopper fixedly installed on the driving plate, and a swinging component for driving the stirring paddle to swing; a material groove is formed in the feeding paddle, and the feeding hopper is communicated with the feeding paddle through a hose.

[0011] Furthermore, multiple groups of feeding paddles are equidistantly arranged on the mounting plate, and the feeding paddle is composed of a feeding end and a discharging end; the feeding end is a convex block with a middle bulge; the discharging end is a material groove formed on the back of the convex block.

[0012] Furthermore, the swinging component includes: a second gear rotatably installed on the driving plate, a dial plate coaxially and fixedly connected to the second gear, and a first spring for driving the mounting plate to reset.

[0013] Furthermore, the swinging component also includes: an anti-blocking component for preventing the material groove from being blocked. The anti-blocking component includes: a poking top pin slidably installed in the material groove of the feeding paddle, a fixing rod fixedly connected to the poking top pin, and a second spring fixedly installed between the poking top pin and the driving plate.

[0014] Furthermore, a cylinder for driving the mounting plate to turn over is also provided on the driving plate, and a water outlet is provided on the feeding paddle; the mounting plate is located on the extending stroke of the cylinder.

[0015] Furthermore, a stirring component is also provided in the feeding hopper. The stirring assembly includes: a first bevel gear meshing with the second gear, a second bevel gear meshing with the first bevel gear, and a mixing roller coaxially and fixedly connected to the second bevel gear; the mixing roller is rotatably installed in the feeding hopper.

[0016] Furthermore, the blanking mechanism includes: a blanking port opened on the side wall of the sand mixing bin, a blanking plate for blocking the blanking port, and an electric push rod for driving the blanking plate to move; the piston rod of the electric push rod is fixedly connected to the blanking plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects: In the sand mixing machine for foundry molding sand of the present invention, by setting the feeding paddle to insert into the interior of the materials in the sand mixing bin, the adhesive is directly injected into the material matrix; during the circumferential rotation of the feeding assembly along the sand mixing bin, on the one hand, three-dimensional shear agitation of the materials is carried out to strengthen the macroscopic mixing effect; on the other hand, by deep burying the materials for feeding, the exposure of the adhesive on the surface of the materials is avoided, and dust generation is inhibited from the source. In addition, this feeding method can achieve uniform dispersion of the adhesive in the material matrix, significantly shorten the mixing cycle, and effectively prevent chemical phase changes caused by the temperature rise of the sand and gravel due to excessive stirring. Description of the Drawings

[0018] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention.

[0019] Figure 1 It is a schematic structural diagram of a sand mixing machine for foundry molding sand of the present invention; Figure 2 It is a cross-sectional view of a sand mixing machine for foundry molding sand of the present invention; Figure 3 It is a schematic structural diagram of the mixing mechanism in the present invention; Figure 4 It is Figure 3 a schematic structural diagram of part A in Figure 5 It is a top view of the mixing mechanism in the present invention; Figure 6 It is a schematic structural diagram of the blanking assembly in the present invention; Figure 7 It is a schematic structural diagram of the anti-blocking assembly in the present invention; Figure 8 It is a schematic structural diagram of the blanking mechanism in the present invention.

[0020] In the figure: 1. Sand mixing bin; 2. Mixing mechanism; 3. Feeding mechanism; 21. Driving motor; 22. Driving rod; 23. Driving plate; 24. Stirring paddle; 251. Inner gear ring; 252. First gear; 253. Synchronizing member; 254. Scraping rod; 261. Mounting plate; 262. Material distributing paddle; 263. Loading hopper; 2621. Material chute; 2622. Hose; 2623. Protrusion; 2631. Second gear; 2632. Pushing plate; 2633. First spring; 2634. Feeding thimble; 2635. Fixed rod; 2636. Second spring; 2625. Cylinder; 2624. Water outlet; 2611. First bevel gear; 2612. Second bevel gear; 2613. Mixing roller; 32. Blocking plate; 33. Electric push rod. Detailed implementation mode

[0021] In order to make the objectives, 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. Apparently, the described embodiments are only part of the embodiments of the present invention, rather than all of them.

[0022] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "transverse", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 thus should not be construed as limiting the protection scope of the present invention. When a component is referred to as being "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0023] As Figures 1 to 8 shown, a sand mixing machine for foundry molding sand of the present invention includes: a sand mixing bin 1, a mixing mechanism 2 for mixing the molding sand in the sand mixing bin 1, and a feeding mechanism 3 for feeding the molding sand in the sand mixing bin 1. When it is necessary to mix the molding sand, the staff sequentially pour the molding sand raw materials, adhesives, etc. into the sand mixing bin 1, then start the mixing mechanism 2 to stir and mix the molding sand in the sand mixing bin 1, and finally feed the mixed molding sand in the sand mixing bin 1 through the feeding mechanism 3. The raw material components of the molding sand are preferably as follows: for example, for cast iron parts: 100% green sand, 6%-8% bentonite, 4%-6% pulverized coal, 4%-5% water; for high-precision castings, α-starch (0.3%-0.5%) needs to be additionally added to improve collapsibility; The feeding sequence is preferably as follows: first add 70% used sand + 30% new sand and premix for 1 minute, then add the binder and dry mix for 2 minutes, and finally add the remaining water and additives in portions and wet mix for 3-5 minutes; By carrying out dry mixing and wet mixing step by step, it is avoided that the binder directly contacts with water to form lumps, ensuring uniform coating.

[0024] The mixing mechanism 2 includes: a driving motor 21 fixedly installed at the bottom of the sand mixing bin 1, a driving rod 22 fixed to the motor transmission shaft, a driving plate 23 fixedly connected to the driving rod 22, a stirring paddle 24 rotatably installed on the driving plate 23, and a driving component for driving the stirring paddle 24 to rotate as the driving plate 23 rotates; The driving component includes: an internal gear ring 251 fixedly installed on the sand mixing bin 1, a first gear 252 meshing with the internal gear ring 251, and the first gear 252 is synchronously connected to the stirring paddle 24 through a synchronizing member 253; the first gear 252 is rotatably installed on the driving plate 23.

[0025] When it is necessary to stir the molding sand in the sand mixing bin 1, start the driving motor 21. The driving motor 21 drives the driving rod 22 and the driving plate 23 fixedly installed on the driving rod 22 to rotate. When the driving plate 23 rotates, the first gear 252 rotatably installed on the driving plate 23 rotates under the meshing of the internal gear ring 251. When the first gear 252 rotates, the stirring paddle 24 synchronously rotates under the action of the synchronizing member 253, so as to rotate the gravel in the sand mixing bin 1 both in revolution and rotation, forming a three-dimensional shear flow field between the mixed gravel particles, thereby greatly enhancing the mixing effect and shortening the mixing time; it should be noted here that the synchronizing member 253 is preferably a synchronous belt or a sprocket.

[0026] A scraping rod 254 is also fixedly installed on the driving rod 22; the scraping 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, it also synchronously drives the scraping rod 254 to rotate, so as to stir the gravel in the bottom dead angle and prevent the gravel from adhering to the bottom of the sand mixing bin 1, thereby affecting the feeding efficiency.

[0027] A feeding component for feeding the binder during stirring is also provided on the driving plate 23; The blanking assembly includes: a mounting plate 261 hinged to the driving plate 23, a material pushing paddle 262 fixedly installed on the mounting plate 261, a feeding hopper 263 fixedly installed on the driving plate 23, and a swinging assembly for driving the stirring paddle 24 to swing; a material groove 2621 is formed in the material pushing paddle 262, and the feeding hopper 263 is communicated with the material pushing paddle 262 through a flexible hose 2622; When it is necessary to add cohesive dry materials such as bentonite and pulverized coal into the sand mixing bin 1, the operator puts the materials into the feeding hopper 263. Under the action of the driving mechanism, the driving plate 23 drives the mounting plate 261 to rotate synchronously through the coupling device, and the material pushing paddle 262 hinged to the mounting plate 261 is adjusted to the working position perpendicular to the axis of the sand mixing bin 1. When the mounting plate 261 drives the blanking assembly to perform a planetary motion in the sand mixing bin 1, the adhesive in the feeding hopper 263 is quantitatively introduced into the aggregate groove 2621 of the material pushing paddle 262 through the flexible conveying pipe, and through the revolution motion of the material pushing paddle 262 along the sand mixing bin 1, the directional feeding of the adhesive from the aggregate groove 2621 to the materials in the sand mixing bin 1 is realized.

[0028] It should be particularly noted that there are significant defects in the traditional feeding method: since the cohesive agents such as bentonite and pulverized coal are in powder form, the conventional blanking mechanism 3 directly puts them on the surface layer of the sand mixing bin 1, resulting in aerosol dust generated by the powder materials under the shearing action of the paddle blades during the stirring operation, threatening the respiratory health of the operators.

[0029] This device inserts the material pushing paddle 262 into the materials inside the sand mixing bin 1, so that the adhesive is directly injected into the material matrix; during the circumferential rotation of the blanking assembly along the sand mixing bin 1, on the one hand, the materials are three-dimensionally sheared and agitated to enhance the macroscopic mixing effect; on the other hand, through deep-buried material feeding, the exposure of the adhesive on the material surface is avoided, and the generation of dust is inhibited from the source. In addition, this feeding method can realize the uniform dispersion of the adhesive in the material matrix, significantly shorten the mixing cycle, and effectively prevent the chemical phase change caused by the temperature rise of the gravel due to excessive stirring.

[0030] A plurality of groups of material pushing paddles 262 are equidistantly arranged on the mounting plate 261, and the material pushing paddle 262 is composed of a material pushing end and a blanking end; the material pushing end is a convex block 2623 with a raised middle; the blanking end is a material groove 2621 opened on the back of the convex block 2623; Specifically described herein is that under the driving action of the motor, the material distributing paddle rotates. The material distributing end of the material distributing paddle exerts a force on the raw materials in the sand mixing bin 1 by virtue of its convex structure, dispersing the raw materials and forming a feeding channel. Subsequently, the raw materials are quickly fed through the material trough 2621 and accurately enter the feeding channel. During the continuous rotation of the stirring rod, the adhesive that has been fed 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 directly fall onto the surface of the accumulated raw materials, improving the stability and environmental friendliness of the entire process.

[0031] The swing assembly includes: a second gear 2631 rotatably mounted on the driving plate 23, a baffle plate 2632 fixedly connected coaxially with the second gear 2631, and a first spring 2633 for driving the mounting plate 261 to reset; When the motor drives the driving plate 23 to rotate around its axis, the second gear 2631 rotates under the driving action of the internal gear ring 251 engaged therewith. Since the second gear 2631 is rigidly connected coaxially with the baffle plate, when the second gear 2631 rotates, it will drive the baffle plate to rotate around the same axis synchronously.

[0032] During the rotation of the baffle plate 2632, the wave plate 2632 contacts the lower half of the paddle, and its convex part contacts and abuts against the paddle on the mounting plate 261. Based on the force transmission and lever principle, this abutting force will drive the mounting plate 261 to deflect around its hinge point with the driving plate 23. As the mounting plate continues to rotate, when the lower half of the baffle plate ends the abutting state with the mounting plate 261, the first spring 2633 releases its elastic potential energy to generate a restoring force, thereby driving the mounting plate 261 to deflect in the reverse direction to achieve the reset action. It should be added here that an axial buffer is provided at the hinge between the mounting plate and the driving plate to abut against the stroke generated by the baffle plate driving the mounting plate axially during rotation. The specific structure can be that there is an axial movement gap on the hinge shaft where the mounting plate is hinged to the driving plate, and a reset spring for driving the mounting plate to reset.

[0033] During the reciprocating deflection of the mounting plate 261, the material distributing paddle 262 fixedly mounted on the mounting plate 261 will swing synchronously. In this way, under the driving of the motor, the material distributing paddle 262 not only realizes its own rotational movement but also superimposes a swinging movement. This enables the material distributing paddle 262 to accurately place the adhesive at different depth positions of the raw material layer in the sand mixing bin 1, effectively increasing the contact area and mixing degree between the adhesive and the material, and thus significantly improving the efficiency and quality of the subsequent mixing process of the stirring paddle 24 for the material.

[0034] The swing assembly further includes: an anti-blocking assembly for preventing blockage of the material trough 2621; The anti-blocking assembly includes: a material-poking ejector pin 2634 slidably mounted in the material groove 2621 of the material-poking paddle 262, a fixing rod 2635 fixedly connected to the material-poking ejector pin 2634, and a spring 2636 fixedly mounted between the material-poking ejector pin 2634 and the driving plate 23; During the swinging action of the paddle 262, the spring 2636 generates elastic restoring force due to the tensile or compressive deformation, and the restoring force acts on the fixed rod 2635, thereby driving the fixed rod 2635 and the material-poking ejector pin 2634 thereon to reciprocate along the axial direction of the material trough 2621. During the movement, the material-poking ejector pin 2634 exerts force on the adhesive accumulated at the material discharge port of the material trough 2621 to disperse and stir it, thereby effectively preventing the adhesive from agglomerating and hardening in the material trough 2621, ensuring the unobstructed material discharge channel and maintaining the stability of the material discharge efficiency.

[0035] 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.

[0036] The driving plate 23 is also 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 stroke of the cylinder 2625 extending outward; When the mixing mechanism 2 completes the dry mixing process of the raw sand and the adhesive, the staff injects a certain amount of clean water into the upper hopper 263. At this time, the control system drives the piston rod of the cylinder 2625 to extend, and the piston rod forms a mechanical contact with the mounting plate 261 during the extension process, and drives the mounting plate 261 to deflect upward around the hinge point between it and the fixed structure, thereby making the paddle 262 as a whole away from the dry mixed sand pile.

[0037] In this state, the clean water in the upper hopper 263 is transported to the inside of the material trough 2621 of the material-displacing paddle 262 through the flexible water pipeline, and is evenly sprayed onto the surface of the dry-mixed sand material through the water outlet holes preset on the surface of the material-displacing paddle 262. At the same time, the stirring paddle 24 starts and performs a rotational motion to wet-mix the wetted sand material.

[0038] It should be particularly 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 2636 to form a mechanical sealing structure; this structure ensures that clean water only flows out through the water outlet holes 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, thereby avoiding pipeline blockage or uneven mixing caused by adhesive residue.

[0039] As an extended design of this solution, the water outlet can be directly connected to the pipeline system of an external booster pump, and the water pressure requirements under different working conditions can be met by adjusting the pump output pressure, further improving the wet mixing efficiency.

[0040] It should be emphasized here that by pushing the feeding paddle 262 to flip through the cylinder 2625, on the one hand, after the feeding paddle 262 flips, its water outlet is precisely located in the area directly above the sand pile. During the process of the motor driving the feeding paddle 262 to rotate, the clear water can evenly cover the surface of the sand, significantly improving the wet mixing effect and reducing the energy consumption and time cost of the subsequent stirring process; on the other hand, after the feeding paddle 262 flips away from the sand pile, it effectively avoids the adhesion of sand to the surface of the feeding paddle 262 during the wet mixing process, thereby preventing sand from entering the material tank 2621 and causing blockage, ensuring the stability and production efficiency of the continuous operation of dry mixing - wet mixing.

[0041] A stirring assembly is further provided in the feeding hopper 263; The stirring assembly includes: a bevel gear one 2611 meshing with the gear two 2631, a bevel gear two 2612 meshing with the bevel gear one 2611, and a mixing roller 2613 coaxially and fixedly connected to the bevel gear two 2612; the mixing roller 2613 is rotatably installed in the feeding hopper 263; Driven by the motor to drive the driving plate 23 to rotate, the gear two 2631 rotates synchronously. The rotation of the gear two 2631 drives the bevel gear one 2611, and the bevel gear two 2612 drives the mixing roller 2613 to rotate synchronously, mixing the materials in the feeding hopper 263, thereby preventing the problem of material caking in the feeding hopper 263 and causing blockage of the material discharge.

[0042] The blanking mechanism 3 includes: a blanking port opened on the side wall of the sand mixing bin 1, a blanking plate 32 for blocking the blanking port, and an electric push rod 33 for driving the blanking plate 32 to move; the piston rod of the electric push rod 33 is fixedly connected to the blanking plate 32.

[0043] When the materials in the sand mixing bin 1 are mixed, the electric push rod 33 drives the blanking plate 32 away from the blanking port on the sand mixing bin 1, and at this time, the mixed molding sand in the sand mixing bin 1 is discharged from the blanking port.

[0044] The standard parts used in the present invention can all be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machines, parts, and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be elaborated here. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0045] It should be understood that those of ordinary skill in the art can make improvements or modifications based on the above description, and all such improvements and modifications shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A sand mixing machine for foundry molding sand, characterized in that, Including: A sand mixing bin, a mixing mechanism for mixing molding sand in the sand mixing bin, and a feeding mechanism for feeding the molding sand in the sand mixing bin; The mixing mechanism includes: a driving motor fixedly installed at the bottom of the sand mixing bin, a driving rod fixed to the motor transmission shaft, a driving plate fixedly connected to the driving rod, a stirring paddle rotatably installed on the driving plate, and a driving component that drives the stirring paddle to rotate as the driving plate rotates; The driving component includes: an internal gear ring fixedly installed on the sand mixing bin, a first gear meshing with the internal gear ring, and the first gear is synchronously connected to the stirring paddle through a synchronizing member; the first gear is rotatably installed on the driving plate.

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

3. The sand mixing machine for foundry molding sand according to claim 1, characterized in that, A feeding component for feeding the adhesive during stirring is also provided on the driving plate; The feeding component includes: a mounting plate hinged to the driving plate, a feeding paddle fixedly installed on the mounting plate, a feeding hopper fixedly installed on the driving plate, and a swinging component that drives the stirring paddle to swing; a material groove is formed in the feeding paddle, and the feeding hopper is communicated with the feeding paddle through a hose.

4. The sand mixing machine for foundry molding sand according to claim 3, characterized in that, A plurality of groups of feeding paddles are equidistantly arranged on the mounting plate, and the feeding paddle is composed of a feeding end and a discharging end; the feeding end is a convex block with a raised middle; the discharging end is a material groove formed on the back of the convex block.

5. The sand mixing machine for foundry molding sand according to claim 4, characterized in that, The swinging component includes: a second gear rotatably installed on the driving plate, a dial plate coaxially and fixedly connected to the second gear, and a first spring for driving the mounting plate to reset.

6. The sand mixing machine for foundry molding sand according to claim 5, characterized in that, The swinging component further includes: an anti-blocking component for preventing the material groove from being blocked; The anti-blocking component includes: a poking pin slidably installed in the material groove of the feeding paddle, a fixing rod fixedly connected to the poking pin, and a second spring fixedly installed between the poking pin and the driving plate.

7. The sand mixing machine for foundry molding sand according to claim 6, characterized in that, A cylinder for driving the mounting plate to turn over is also provided on the driving plate, and a water outlet is provided on the feeding paddle; the mounting plate is located on the extending stroke of the cylinder.

8. The sand mixing machine for foundry molding sand according to claim 7, characterized in that, A stirring component is also provided in the feeding hopper; The stirring component includes: a first bevel gear meshing with the second gear, a second bevel gear meshing with the first bevel gear, and a mixing roller coaxially and fixedly connected to the second bevel gear; the mixing roller is rotatably installed in the feeding hopper.

9. The sand mixing machine for foundry molding sand according to claim 1, characterized in that, 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.

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