A sand mixer used in intelligent casting island

Abstract

The present invention relates to the technical field of sand mixers, and discloses a sand mixer applied to an intelligent casting island, comprising a first sand mixing device, wherein the first sand mixing device comprises a sand mixing assembly; the sand mixing assembly comprises a rotatable double-layer sand mixing tank, and the double-layer sand mixing tank has an upper annular cavity and a lower convex cavity. In the present invention, when the double-layer sand mixing tank rotates, the sand particles in the upper annular cavity are thrown out from the upper discharge hole due to the action of centrifugal force, and the movement direction of the sand particles is changed by the conical bucket located at the top, causing the sand particles to move obliquely downward, and the sand particles in the lower convex cavity are thrown out from the lower discharge hole due to the action of centrifugal force, and the movement direction of the sand particles is changed by the conical bucket located at the bottom, causing the sand particles to move obliquely upward, and collision and mixing are formed between the sand particles moving obliquely downward and the sand particles moving obliquely upward. Since the collision force is relatively large, the mixing effect is better.

Description

Technical Field

[0001] The present invention relates to the technical field of sand mixers, and more particularly to a sand mixer applied to an intelligent casting island. Background Art

[0002] In modern industrial production, the intelligent casting island, as an advanced integrated casting production system, places extremely high demands on the efficiency and quality of the sand processing link. The sand mixer is the core equipment in the sand processing process, and its performance directly affects the quality of castings and production efficiency.

[0003] Currently, most common sand mixers on the market utilize a traditional rotary mixing mechanism with agitating blades. This design primarily relies on the propulsion and turbulence of the blades to mix the sand, resulting in a relatively simple mixing process. Firstly, due to the limited contact area between the blades and the sand, the sand particles' movement paths within the mixer are relatively fixed, making it difficult to achieve sufficient interleaving and collision. This results in poor sand mixing uniformity and prone to localized inadequate mixing, failing to meet the high-quality molding sand requirements of intelligent casting systems. Secondly, the structural design of traditional sand mixers lacks targeted optimization, resulting in poor adaptability when handling sand particles of varying particle sizes and moisture levels. This requires frequent parameter adjustments and even component replacements, severely impacting production efficiency. Furthermore, the kinetic energy of the sand particles in existing sand mixers primarily comes from the mechanical action of the blades, resulting in high energy consumption and difficulty in further improving mixing efficiency, making it difficult to adapt to the automated, efficient production schedule of intelligent casting systems. Therefore, the development of a sand mixer suitable for intelligent casting systems that can achieve efficient and uniform sand mixing and exhibits good adaptability is urgently needed. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a sand mixer applied to an intelligent casting island, which has the advantages of collision mixing.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a sand mixer for use in an intelligent casting island, comprising a first sand mixing device, wherein the first sand mixing device comprises a sand mixing assembly;

[0006] The sand mixing assembly includes a rotatable double-layer sand mixing tank, the double-layer sand mixing tank having an upper annular cavity and a lower convex cavity, an upper discharge hole communicating with the upper annular cavity is opened on the outer wall of the double-layer sand mixing tank, and a lower discharge hole communicating with the lower convex cavity is also opened on the outer wall of the double-layer sand mixing tank;

[0007] Two conical buckets symmetrical about a horizontal plane are provided on the circumference of the double-layer sand mixing tank, and the conical buckets coincide with the central axis of the double-layer sand mixing tank. The conical bucket at the bottom forms an annular gap with the circumference of the double-layer sand mixing tank for sand to fall.

[0008] When the double-layer sand mixing tank rotates, the sand particles in the upper annular cavity are thrown out from the upper discharge hole due to the action of centrifugal force, and the moving direction of the sand particles is changed by the conical bucket at the top, causing the sand particles to move obliquely downward. The sand particles in the lower convex cavity are thrown out from the lower discharge hole due to the action of centrifugal force, and the moving direction of the sand particles is changed by the conical bucket at the bottom, causing the sand particles to move obliquely upward. The sand particles moving obliquely downward and the sand particles moving obliquely upward collide and mix with each other.

[0009] in:

[0010] The area where the sand particles moving obliquely downward collide with the sand particles moving obliquely upward is outside the vertical projections of the two conical buckets.

[0011] As a preferred technical solution of the present invention, the second sand mixing device is further included, and the second sand mixing device is used to re-mix the sand from the first sand mixing device, and the second sand mixing device includes a sand mixing barrel;

[0012] The inner wall of the sand mixing barrel is fixed with a plurality of triangular protrusions distributed in a ring shape. A sand mixing shaft is vertically rotated inside the sand mixing barrel. The sand mixing shaft is driven by a motor. At least one stirring assembly is fixed on the circumference of the sand mixing shaft.

[0013] The stirring assembly includes a fixed plate, which is fixed on the sand mixing shaft. An elastic scale plate is vertically slidably arranged on the end of the fixed plate away from the sand mixing shaft. When the elastic scale plate rotates, the end of the elastic scale plate away from the fixed plate is gradually squeezed by the triangular protrusion, causing the elastic scale plate to bend. After the elastic scale plate passes over the triangular protrusion, the elastic scale plate vibrates the sand particles while restoring its shape.

[0014] As a preferred technical solution of the present invention, an undulating ring is fixed on the inner bottom surface of the sand mixing barrel, and the undulating surface of the undulating ring forms an extrusion with the bottom of the elastic ruler.

[0015] As a preferred technical solution of the present invention, a sand guide cone 1 is fixed at the bottom of the lower convex cavity to guide the sand particles to the lower discharge hole, and a sand guide cone 2 is fixed at the top of the lower convex cavity to guide the sand particles to the first sand guide cone.

[0016] As a preferred technical solution of the present invention, the first sand mixing device further includes a support assembly, the sand mixing assembly is located inside the support assembly, and the sand mixing assembly is driven by the drive assembly;

[0017] The support assembly includes a support tube, the conical bucket is fixed to the inner wall of the support tube through a mounting plate, a support base is fixed to the bottom of the support tube, and an annular fixing frame for supporting a double-layer sand mixing tank is fixed inside the support tube through mounting plates distributed in an annular shape. The double-layer sand mixing tank is located inside the annular fixing frame, and the double-layer sand mixing tank is rotatably matched with the annular fixing frame.

[0018] The driving assembly includes a carrier frame, which is fixed on the top of the supporting cylinder. A vertical shaft is rotatably passed through the carrier frame. The bottom end of the vertical shaft passes through a sand guide cone and is fixed on the double-layer sand mixing tank. A connecting rod is fixed on the circumferential side of the vertical shaft. One end of the connecting rod away from the vertical shaft is fixed on the inner wall of the double-layer sand mixing tank. The vertical shaft is driven by a driving motor fixed to the carrier frame. A No. 1 sand conveying pipe for conveying sand into the lower convex cavity is installed on the carrier frame. A No. 2 sand conveying pipe for conveying sand into the upper annular cavity is also installed on the carrier frame.

[0019] As a preferred technical solution of the present invention, a material guide cone is fixed to the top of the sand mixing barrel, and the material guide cone is used to guide the material mixed by the first sand mixing device into the interior of the sand mixing barrel.

[0020] As a preferred technical solution of the present invention, a fixed block is fixed inside the fixed plate, a spring is installed at the bottom of the fixed block, and a square cavity is opened at one end of the elastic ruler close to the fixed plate. The fixed block and the spring are both located inside the square cavity, and the bottom end of the spring is fixed on the inner bottom surface of the square cavity.

[0021] As a preferred technical solution of the present invention, a receiving rod for installing the sand mixing barrel is fixed to the peripheral side of the outer wall of the sand mixing barrel.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. When the double-layer sand mixing tank of the present invention rotates, the sand particles in the upper annular cavity are thrown out from the upper discharge hole due to the action of centrifugal force, and the moving direction of the sand particles is changed by the conical bucket at the top, causing the sand particles to move obliquely downward. The sand particles in the lower convex cavity are thrown out from the lower discharge hole due to the action of centrifugal force, and the moving direction of the sand particles is changed by the conical bucket at the bottom, causing the sand particles to move obliquely upward. The sand particles moving obliquely downward and the sand particles moving obliquely upward collide and mix with each other, and the mixing effect is better due to the greater collision force.

[0024] 2. In the present invention, since the area where the sand particles moving obliquely downward and the sand particles moving obliquely upward collide is outside the vertical projections of the two conical buckets, the sand particles moving obliquely downward and the sand particles moving obliquely upward will fall downward from outside the vertical projections of the conical buckets after the collision, thereby preventing the sand particles after the collision from affecting the sand particles colliding with the conical buckets;

[0025] 3. During the rotation of the stirring assembly of the present invention, the end of the elastic ruler away from the fixed plate is gradually squeezed by the triangular protrusion, causing the elastic ruler to bend. After the elastic ruler passes over the triangular protrusion, the elastic ruler vibrates the sand particles while recovering its shape. By combining the elastic ruler and the triangular protrusion, the elastic ruler accumulates force when passing over the triangular protrusion due to the obstruction of the triangular protrusion. After the elastic ruler passes over the triangular protrusion, the accumulated force is released, causing the elastic ruler to vibrate for a period of time. This vibration can achieve a better mixing effect of the sand particles.

[0026] 4. In the present invention, relative sliding in the vertical direction can occur between the elastic scale plate and the fixed plate, and due to the provision of the spring, the elastic scale plate can be kept at the bottom without generating any external force. Through the provision of the undulating ring, the elastic scale plate can be continuously squeezed by the undulating ring during its rotation, thereby enabling the elastic scale plate to move up and down while rotating, thereby further improving the sand mixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall structure of a sand mixer applied to an intelligent casting island according to the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of a sand mixer applied to an intelligent casting island according to the present invention from an upward perspective;

[0029] Figure 3 This is a front view of a sand mixer applied to an intelligent casting island according to the present invention;

[0030] Figure 4 Schematic diagram of the structure of the first sand mixing device of the present invention;

[0031] Figure 5 This is an exploded view of the first sand mixing device of the present invention;

[0032] Figure 6 is a cross-sectional view of a first sand mixing device of the present invention;

[0033] Figure 7 This is a schematic structural diagram of the sand mixing assembly of the present invention;

[0034] Figure 8 Schematic diagram of the structure of the second sand mixing device of the present invention;

[0035] Figure 9 For the present invention Figure 8 Enlarged view of part A;

[0036] Figure 10 It is a structural schematic diagram of the stirring assembly of the present invention;

[0037] Figure 11 Schematic diagram of the internal structure of the stirring assembly of the present invention.

[0038] In the picture:

[0039] 100, first sand mixing device; 200, second sand mixing device;

[0040] 1. Support assembly; 2. Sand mixing assembly; 3. Drive assembly; 4. Sand mixing barrel; 5. Material guide cone; 6. Sand mixing shaft; 7. Stirring assembly; 8. Rising ring;

[0041] 11. Support cylinder; 12. Support base; 13. Ring fixing frame;

[0042] 21. Double-layer sand mixing tank; 22. Upper annular cavity; 23. Lower convex cavity; 24. Upper discharge hole; 25. Lower discharge hole; 26. Conical bucket; 27. Sand guide cone 1; 28. Sand guide cone 2;

[0043] 31. Carrying frame; 32. Vertical axis; 33. Connecting rod; 34. Driving motor; 35. No. 1 sand conveying pipe; 36. No. 2 sand conveying pipe;

[0044] 41. Receiver rod; 42. Triangular protrusion;

[0045] 71. Fixed plate; 72. Elastic ruler plate; 73. Fixed block; 74. Spring; 75. Square cavity. DETAILED DESCRIPTION

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] 1. Overall structure: The sand mixer provided by the present invention is applied to the intelligent casting island, such as Figures 1 to 11 As shown, the first sand mixing device 100 and the second sand mixing device 200 work together to achieve efficient and high-quality sand mixing.

[0048] (1) The first sand mixing device 100 comprises a support assembly 1, a sand mixing assembly 2, and a drive assembly 3. The support assembly 1, serving as the basic structure of the entire first sand mixing device, primarily consists of a support cylinder 11, a support base 12, and an annular mounting bracket 13. The support cylinder 11 is constructed from high-strength alloy steel and precision-cast, offering excellent rigidity and stability, capable of withstanding the vibrations and centrifugal forces generated during the sand mixing process. The support base 12 at its base is designed as an inverted trapezoidal structure, increasing its contact area with the ground and further enhancing the overall stability of the device, preventing any shaking or displacement during operation. The annular mounting bracket 13 is secured within the support cylinder 11 by several mounting plates evenly distributed in an annular pattern. These mounting plates are welded to the support cylinder 11 and the annular mounting bracket 13 to ensure a secure connection. The inner diameter of the annular mounting bracket 13 matches the outer diameter of the double-layer sand mixing tank 21. High-precision bearings are used between the two, enabling the double-layer sand mixing tank 21 to rotate flexibly within the annular mounting bracket 13, while also reducing friction and increasing the device's service life.

[0049] The core component of the sand mixing assembly 2 is a rotatable double-layer sand mixing tank 21, which has a unique double-layer cavity structure, with the upper layer being an annular cavity 22 and the lower layer being a convex cavity 23. The double-layer sand mixing tank 21 is made of wear-resistant alloy material, and its inner wall undergoes a special surface treatment process, such as hard chrome plating or spraying a wear-resistant coating, to enhance wear resistance and extend the service life of the equipment. The upper annular cavity 22 and the lower convex cavity 23 are respectively used to store sand of different types or at different processing stages. The outer wall circumference of the double-layer sand mixing tank 21 is respectively provided with an upper discharge hole 24 connected to the upper annular cavity 22 and a lower discharge hole 25 connected to the lower convex cavity 23. The shape and size of the discharge holes are optimized to ensure that the sand can be discharged smoothly while avoiding sand blockage.

[0050] Two conical hoppers 26 are located around the double-layer sand mixing tank 21, symmetrically arranged about the horizontal plane. These hoppers 26 are secured to the inner wall of the support tube 11 via mounting plates, coinciding with the central axis of the double-layer sand mixing tank 21. The conical hopper 26 at the bottom forms an annular gap of a specific width with the circumference of the double-layer sand mixing tank 21. The width of this gap is precisely designed based on the sand's particle size and fluidity, ensuring smooth descent. Furthermore, a sand guide cone 1 27 is fixed to the bottom of the lower convex cavity 23, while a sand guide cone 2 28 is fixed to the top. Both cones feature a smooth, curved design, effectively directing sand toward the sand guide cone 1 27 and the lower discharge hole 25, optimizing the sand's flow path within the cavity.

[0051] The drive assembly 3 provides power for the sand mixing assembly 2. A support frame 31 is fixed to the top of the support tube 11 and welded from high-strength steel sections, providing sufficient strength and rigidity to support and secure the other components. A rotating vertical shaft 32 runs through the support frame 31. Made of high-quality alloy steel and tempered to enhance its overall mechanical properties, the shaft's bottom end passes through the sand guide cone 27 and is securely connected to the double-layer sand mixing tank 21 via high-strength bolts, ensuring stable power transmission. Connecting rods 33 are fixed to the sides of the vertical shaft 32. These connecting rods 33 are made of rectangular tubing, one end welded to the vertical shaft 32 and the other end welded to the inner wall of the double-layer sand mixing tank 21. The even distribution of multiple connecting rods 33 enhances the stability of the double-layer sand mixing tank 21 during rotation. The vertical shaft 32 is driven by a drive motor 34 fixed to the support frame 31. This drive motor 34 utilizes a variable frequency motor, allowing for flexible speed adjustment according to varying sand mixing process requirements. The carrier frame 31 is also equipped with a No. 1 sand conveying pipe 35 and a No. 2 sand conveying pipe 36, which are used to convey sand to the lower convex cavity 23 and the upper annular cavity 22 respectively. The conveying pipe adopts a structure combining wear-resistant rubber hose and hard metal pipe, which is easy to install and maintain, while ensuring smooth sand conveying.

[0052] (2) The second sand mixing device 200 includes a sand mixing drum 4 and a stirring assembly 7. The sand mixing drum 4 is the main body of the second sand mixing device. A supporting rod 41 is fixed to the outer wall of the sand mixing drum 4. The supporting rod 41 is used to install the sand mixing drum 4 in a suitable position on the intelligent casting island. The inner wall of the sand mixing drum 4 is fixed with a number of triangular protrusions 42 arranged in a circular pattern. These triangular protrusions 42 are made of wear-resistant ceramic material and fixed to the inner wall of the sand mixing drum 4 using a special bonding process. The height, angle, and spacing of the triangular protrusions 42 were determined through extensive testing and simulation analysis to ensure that they cooperate with the stirring assembly 7 during the sand mixing process to achieve optimal mixing results. A material guide cone 5 is fixed to the top of the sand mixing drum 4. The material guide cone 5 adopts a smooth conical structure. Its tapered design effectively guides the material mixed by the first sand mixing device 100 into the sand mixing drum 4, preventing splashing or accumulation of material during the introduction process.

[0053] The stirring assembly 7 is installed on the side of the sand mixing shaft 6 inside the sand mixing barrel 4. The sand mixing shaft 6 is driven by a motor. The motor adopts a servo motor and can accurately control the speed and direction of the sand mixing shaft 6. The stirring assembly 7 includes a fixed plate 71 and an elastic ruler plate 72. The fixed plate 71 is fixed on the sand mixing shaft 6 and is made of high-strength aluminum alloy material. It is tightly connected to the sand mixing shaft 6 by bolts. The end of the fixed plate 71 away from the sand mixing shaft 6 is vertically slidably connected to the elastic ruler plate 72. The elastic ruler plate 72 is made of spring steel with good elasticity and wear resistance. A fixed block 73 is fixed inside the fixed plate 71, and a spring 74 is installed at the bottom of the fixed block 73. A square cavity 75 is opened at the end of the elastic ruler plate 72 near the fixed plate 71. The fixed block 73 and the spring 74 are both located inside the square cavity 75, and the bottom end of the spring 74 is fixed to the inner bottom surface of the square cavity 75. This structural design enables the elastic scale plate 72 to slide vertically relative to the fixed plate 71 and, under the action of the spring 74, maintains good contact with the triangular protrusions 42 on the inner wall of the mixing bucket 4 and the undulating ring 8 on the inner bottom surface. The undulating ring 8 fixed to the inner bottom surface of the mixing bucket 4 has a carefully designed shape and height, which creates a continuous squeezing effect with the bottom of the elastic scale plate 72 during its rotation, further enhancing the sand mixing effect.

[0054] II. Working Principle: (I) Working Principle of the First Sand Mixing Device: When the drive motor 34 is activated, it drives the vertical shaft 32 to rotate. Since the vertical shaft 32 is fixedly connected to the double-layer sand mixing tank 21 via the connecting rod 33, the double-layer sand mixing tank 21 rotates at high speed within the annular fixed frame 13. At this time, the sand to be mixed is respectively delivered to the lower convex-shaped cavity 23 through the first sand delivery pipe 35 and to the upper annular cavity 22 through the second sand delivery pipe 36. During the rotation of the double-layer sand mixing tank 21, the sand particles are subjected to centrifugal force. The sand particles in the upper annular cavity 22 are ejected from the upper discharge hole 24 and collide with the conical bucket 26 at the top. According to the principles of conservation of momentum and force decomposition, the conical bucket 26 changes the direction of the sand particles' motion, causing them to acquire a downward velocity component, thus moving diagonally downward. Similarly, the sand particles in the lower convex cavity 23 are ejected from the lower discharge hole 25 and collide with the conical bucket 26 at the bottom, which changes the direction of the sand particles' motion, causing them to move diagonally upward. Because the sand particles moving diagonally downward and the sand particles moving diagonally upward have different velocity directions and magnitudes, they meet and collide in an area outside the vertical projections of the two conical buckets 26. During this collision, the sand particles generate intense friction, compression, and impact, making the particle distribution of the sand particles more uniform and achieving initial, efficient mixing. At the same time, since the collision area is outside the vertical projection of the conical bucket 26, the sand particles after collision are prevented from interfering with the movement trajectory of the sand particles that subsequently collide with the conical bucket 26, thereby ensuring the continuity and stability of the sand mixing process.

[0055] (2) Operating Principle of the Second Sand Mixing Device: After preliminary mixing in the first sand mixing device 100, the sand particles fall under the influence of gravity along the guide cone 5 into the mixing drum 4. The motor driving the mixing shaft 6 is activated, causing the mixing shaft 6 to begin rotating the agitator assembly 7. As the agitator assembly 7 rotates, the elastic scale plate 72, along with the fixed plate 71, moves in a circular motion around the mixing shaft 6. As the end of the elastic scale plate 72, distal from the fixed plate 71, approaches the triangular protrusion 42 on the inner wall of the mixing drum 4, the triangular protrusion 42 blocks the elastic scale plate 72, subjecting it to a compressive force perpendicular to its direction of motion. This compresses the elastic scale plate 72, causing it to gradually bend and deform. During this process, the spring 74 is compressed, storing elastic potential energy in the elastic scale plate 72. Once the elastic scale plate 72 passes over the triangular protrusion 42, the spring 74 releases this potential energy, causing the elastic scale plate 72 to vibrate as it recovers its shape. This vibrational energy is transferred to the surrounding sand particles, causing them to vibrate violently, further improving the uniformity of the mixing process. Furthermore, because the elastic scale plate 72 and the fixed plate 71 can slide relative to each other in the vertical direction and, under the action of the spring 74, always maintain a downward trend, during the rotation of the elastic scale plate 72, its bottom continuously presses against the undulating surface of the undulating ring 8 on the inner bottom surface of the sand mixing bucket 4. This squeezing action causes the elastic scale plate 72 to move up and down in the vertical direction while performing a circular motion, further increasing the complexity of the motion trajectory of the sand particles in the sand mixing bucket 4, allowing the sand particles to be fully mixed in different spatial dimensions, and greatly improving the sand mixing effect.

[0056] 3. Step-by-step instructions for use: (1) Equipment installation and commissioning: Determine the installation location of the sand mixer based on the layout and process flow of the intelligent casting island. Secure the support base 12 of the support assembly 1 to the flat ground with anchor bolts, ensuring that the support tube 11 is perpendicular to the ground.

[0057] The annular fixing frame 13 is installed inside the supporting tube 11 , and the central axis of the annular fixing frame 13 is ensured to coincide with the central axis of the supporting tube 11 through measurement and adjustment.

[0058] Install the double-layer sand mixing tank 21 into the annular fixing frame 13 and check the rotational fit between the double-layer sand mixing tank 21 and the annular fixing frame 13 to ensure smooth rotation without any jamming. Install the conical bucket 26, sand guide cone 1 27, and sand guide cone 2 28 and check their installation security and position accuracy.

[0059] Install the drive assembly 3, fix the carrier frame 31 on the top of the support tube 11, install the vertical shaft 32, connecting rod 33, drive motor 34, No. 1 sand conveying pipe 35 and No. 2 sand conveying pipe 36, and perform electrical connections and debugging to ensure that the drive motor 34 can operate normally and the sand conveying pipeline is unobstructed.

[0060] Install the second sand mixing device 200, install the sand mixing barrel 4 to the appropriate position through the receiving rod 41, install the material guide cone 5, sand mixing shaft 6, stirring assembly 7 and heave ring 8, and debug to ensure that the sand mixing shaft 6 rotates smoothly and the stirring assembly 7 operates normally.

[0061] (2) Sand mixing operation: Start the drive motor 34 and adjust the double-layer sand mixing tank 21 to a suitable rotation speed. Generally, the rotation speed range is set to 100-300 rpm according to the properties of the sand particles and the sand mixing requirements.

[0062] At the same time, the No. 1 sand conveying pipe 35 and the No. 2 sand conveying pipe 36 are opened to convey the sand to be mixed into the lower convex cavity 23 and the upper annular cavity 22 respectively. The conveying speed is adjusted according to the volume of the double-layer sand mixing tank 21 and the sand mixing time requirement.

[0063] Observe the operation of the first sand mixing device 100 to ensure that the sand particles can be smoothly thrown out from the upper discharge hole 24 and the lower discharge hole 25, and collide and mix under the action of the two conical buckets 26, and the mixed sand particles can smoothly enter the sand mixing barrel 4 along the guide cone 5.

[0064] After the sand enters the mixing barrel 4, start the motor driving the mixing shaft 6 and adjust its speed to an appropriate range, typically 200-400 rpm. Observe the operation of the stirring assembly 7 to ensure that the elastic scale plate 72 is properly interacting with the triangular protrusion 42 and the undulating ring 8 to further mix the sand.

[0065] The sand mixing time is set according to the sand mixing process requirements, generally 5-15 minutes. During the sand mixing process, the sand mixing state and equipment operating parameters such as motor current and speed can be monitored in real time through the observation window or sensors.

[0066] (3) Discharging and equipment cleaning: After the sand mixing time is reached, stop the drive motor 34 and the motor driving the sand mixing shaft 6, and close the No. 1 sand conveying pipe 35 and the No. 2 sand conveying pipe 36.

[0067] The discharge port of the sand mixing barrel 4 is opened to discharge the mixed sand particles for subsequent casting production processes.

[0068] Clean the sand mixer, remove the sand remaining in the double-layer sand mixing tank 21, the sand mixing barrel 4 and the conveying pipeline, check the wear of each component, replace or repair the seriously worn components, and prepare for the next sand mixing operation.

[0069] The working principle and use process of the present invention:

[0070] When it is necessary to mix the sand, the drive motor 34 is first started, and the drive motor 34 can drive the vertical shaft 32 and the connecting rod 33 to rotate. Since the end of the connecting rod 33 away from the vertical shaft 32 is fixed to the inner wall of the double-layer sand mixing tank 21, when the vertical shaft 32 and the connecting rod 33 rotate, the double-layer sand mixing tank 21 can be driven to rotate. Then, the sand to be mixed is respectively transported to the lower convex cavity 23 through the No. 1 sand conveying pipe 35 and to the upper annular cavity 22 through the No. 2 sand conveying pipe 36. Since the double-layer sand mixing tank 21 is in a rotating state, the sand in the upper annular cavity 22 and the lower convex cavity 23 will be thrown out from the corresponding upper discharge hole 24 and lower discharge hole 25 respectively due to the action of centrifugal force. Since the circumferential side of the double-layer sand mixing tank 21 is provided with two conical buckets 26 symmetrical about the horizontal plane, when discharging from the upper When the sand particles ejected from the hole 24 and the lower discharge hole 25 collide with the corresponding conical buckets 26, the conical bucket 26 at the top changes the movement direction of the sand particles, causing the sand particles to move obliquely downward, and the conical bucket 26 at the bottom changes the movement direction of the sand particles, causing the sand particles to move obliquely upward. The sand particles moving obliquely downward collide with the sand particles moving obliquely upward, thereby achieving mixing of the sand particles. In addition, the area where the sand particles moving obliquely downward collides with the sand particles moving obliquely upward is outside the vertical projections of the two conical buckets 26. Since the area where the sand particles moving obliquely downward collides with the sand particles moving obliquely upward is outside the vertical projections of the two conical buckets 26, after the sand particles moving obliquely downward collides with the sand particles moving obliquely upward, they will fall downward from the vertical projections of the conical buckets 26, thereby avoiding the impact of the sand particles after the collision on the sand particles colliding with the conical bucket 26.

[0071] When the sand particles moving obliquely downward collide with the sand particles moving obliquely upward, they fall from the vertical projections of the two conical buckets 26 along the guide of the guide cone 5 into the interior of the sand mixing barrel 4. By starting the motor to drive the sand mixing shaft 6, the stirring assembly 7 is driven to rotate. During the rotation of the stirring assembly 7, the end of the elastic scale plate 72 away from the fixed plate 71 is gradually squeezed by the triangular protrusion 42, causing the elastic scale plate 72 to bend. When the elastic scale plate 72 passes over the triangular protrusion 42, the elastic scale plate 72 vibrates the sand particles in the process of restoring its shape. Through the combined use of the elastic scale plate 72 and the triangular protrusion 42, the elastic scale plate 72 can accumulate force due to the obstruction of the triangular protrusion 42 when passing through the triangular protrusion 42. When the elastic scale plate 72 passes over the triangular protrusion 42, the accumulated force is released, which will cause the elastic scale plate 72 to vibrate for a period of time. The vibration can make the sand mixing effect better.

[0072] In addition, since relative sliding in the vertical direction can occur between the elastic scale plate 72 and the fixed plate 71, and due to the provision of the spring 74, the elastic scale plate 72 can be always located at the bottom without generating any external force. Through the provision of the undulating ring 8, the elastic scale plate 72 can be continuously squeezed by the undulating ring 8 during its rotation, so that the elastic scale plate 72 can move up and down while rotating, thereby further improving the sand mixing effect.

[0073] It should be noted that, in this document, relational terms such as first and second, etc., are used only 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 terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0074] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A sand mixer used in an intelligent casting island, characterized by: It comprises a first sand mixing device, wherein the first sand mixing device comprises a sand mixing assembly; The sand mixing assembly includes a rotatable double-layer sand mixing tank, the double-layer sand mixing tank having an upper annular cavity and a lower convex cavity, an upper discharge hole communicating with the upper annular cavity is opened on the outer wall of the double-layer sand mixing tank, and a lower discharge hole communicating with the lower convex cavity is also opened on the outer wall of the double-layer sand mixing tank; Two conical buckets symmetrical about a horizontal plane are provided on the circumference of the double-layer sand mixing tank, and the conical buckets coincide with the central axis of the double-layer sand mixing tank. The conical bucket at the bottom forms an annular gap with the circumference of the double-layer sand mixing tank for sand to fall. When the double-layer sand mixing tank rotates, the sand particles in the upper annular cavity are thrown out from the upper discharge hole due to the action of centrifugal force, and the moving direction of the sand particles is changed by the conical bucket at the top, causing the sand particles to move obliquely downward. The sand particles in the lower convex cavity are thrown out from the lower discharge hole due to the action of centrifugal force, and the moving direction of the sand particles is changed by the conical bucket at the bottom, causing the sand particles to move obliquely upward. The sand particles moving obliquely downward and the sand particles moving obliquely upward collide and mix with each other. in: The area where the sand particles moving obliquely downward collide with the sand particles moving obliquely upward is outside the vertical projections of the two conical buckets; The invention also includes a second sand mixing device, wherein the second sand mixing device is used to remix the sand from the first sand mixing device, and the second sand mixing device includes a sand mixing barrel; The inner wall of the sand mixing barrel is fixed with a plurality of triangular protrusions distributed in a ring shape. A sand mixing shaft is vertically rotated inside the sand mixing barrel. The sand mixing shaft is driven by a motor. At least one stirring assembly is fixed on the circumference of the sand mixing shaft. The stirring assembly includes a fixed plate, which is fixed to the sand mixing shaft. An elastic ruler is vertically slidably mounted on the end of the fixed plate away from the sand mixing shaft. When the elastic ruler rotates, the end of the elastic ruler away from the fixed plate is gradually squeezed by the triangular protrusion, causing the elastic ruler to bend. After the elastic ruler passes over the triangular protrusion, the elastic ruler vibrates the sand particles while recovering its shape. An undulating ring is fixed on the inner bottom surface of the sand mixing barrel, and the undulating surface of the undulating ring forms an extrusion with the bottom of the elastic ruler; A fixing block is fixed inside the fixing plate, a spring is installed at the bottom of the fixing block, a square cavity is opened at one end of the elastic ruler close to the fixing plate, the fixing block and the spring are both located inside the square cavity, and the bottom end of the spring is fixed on the inner bottom surface of the square cavity.

2. The sand mixer for use in an intelligent casting island according to claim 1, characterized in that: A first sand guide cone is fixed at the bottom of the lower convex cavity to guide the sand particles to the lower discharge hole, and a second sand guide cone is fixed at the top of the lower convex cavity to guide the sand particles to the first sand guide cone.

3. The sand mixer for use in an intelligent casting island according to claim 2, characterized in that: The first sand mixing device further comprises a support assembly, the sand mixing assembly being located inside the support assembly and being driven by a drive assembly; the support assembly comprises a support cylinder, the conical bucket being fixed to the inner wall of the support cylinder via a mounting plate, a support base being fixed to the bottom of the support cylinder, an annular fixing frame for carrying a double-layer sand mixing tank being fixed inside the support cylinder via mounting plates distributed in an annular pattern, the double-layer sand mixing tank being located inside the annular fixing frame, and the double-layer sand mixing tank being rotatably matched with the annular fixing frame; The driving assembly includes a carrier frame, which is fixed on the top of the supporting cylinder. A vertical shaft is rotatably passed through the carrier frame. The bottom end of the vertical shaft passes through a sand guide cone and is fixed on the double-layer sand mixing tank. A connecting rod is fixed on the circumferential side of the vertical shaft. One end of the connecting rod away from the vertical shaft is fixed on the inner wall of the double-layer sand mixing tank. The vertical shaft is driven by a driving motor fixed to the carrier frame. A No. 1 sand conveying pipe for conveying sand into the lower convex cavity is installed on the carrier frame. A No. 2 sand conveying pipe for conveying sand into the upper annular cavity is also installed on the carrier frame.

4. The sand mixer for use in an intelligent casting island according to claim 3, characterized in that: A material guide cone is fixed to the top of the sand mixing barrel, and the material guide cone is used to guide the material mixed by the first sand mixing device to the interior of the sand mixing barrel.

5. The sand mixer for use in an intelligent casting island according to claim 4, characterized in that: A receiving rod for installing the sand mixing barrel is fixed on the peripheral side of the outer wall of the sand mixing barrel.

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