A high-efficiency sand mixing device for low-pressure casting

Abstract

The application discloses a kind of high-efficiency sand mixing devices for low-pressure casting, it relates to sand mixing technical field, including frame and dust removal device, the upper end of frame is equipped with two side-by-side material storage cylinders, the lower end of material storage cylinder is respectively connected with auger screw conveyor, the side of material storage cylinder is respectively provided with access for repair, two auger screw conveyors are connected with same sand mixing cylinder, the lower end of sand mixing cylinder is connected with conveyor, the other end of conveyor is connected with elevator, the upper end of elevator is connected with mixing drum, dust removal device is communicated with elevator and mixing drum by pipeline, realize the automatic, fine mixing of sand material, solve the low efficiency of traditional sand mixing device, mixing is not even, prone to block, dust pollution and other pain points, overall have high degree of automation, strong adaptability, environmental protection and energy saving, can stably output material meeting the requirements of low-pressure casting sand, guarantee subsequent casting forming quality, reduce manpower cost and environmental protection pressure simultaneously, adapt to the demand of large-scale production.

Description

Technical Field

[0001] This invention relates to the field of sand mixing technology, specifically to a high-efficiency sand mixing device for low-pressure casting. Background Technology

[0002] Low-pressure casting is a common process in precision casting. The uniformity and efficiency of sand mixing directly determine the molding quality and production continuity of castings. Therefore, the sand mixing device is a core auxiliary equipment in the low-pressure casting production line. Currently, existing sand mixing devices for low-pressure casting still have many problems that urgently need to be solved. Among them, two obvious shortcomings are particularly prominent: First, insufficient mixing uniformity. Existing devices mostly adopt a single-stage stirring structure, where the sand is only simply stirred once, making it difficult to achieve sufficient dispersion and mixing of different sand components. This easily leads to sand agglomeration and imbalanced proportions, resulting in molding sand strength and permeability that do not meet production requirements, thus affecting the molding accuracy of subsequent castings. Second, the equipment is prone to clogging and inconvenient to maintain. Existing devices lack effective anti-clogging designs at the discharge port and feeding channel. Sand is easily left behind and clumps during transportation and mixing, causing channel blockages. Manual shutdown for cleaning is required, increasing labor costs and severely interrupting the production process, reducing production efficiency. Therefore, developing a high-efficiency sand mixing device that can solve the problems of uneven mixing and easy clogging is an urgent need to adapt to the large-scale production of low-pressure casting. Summary of the Invention

[0003] To address the above problems, the present invention provides a high-efficiency sand mixing device for low-pressure casting.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a high-efficiency sand mixing device for low-pressure casting, comprising a frame and a dust removal device, wherein two parallel material storage cylinders are installed at the upper end of the frame, and auger screw conveyors are respectively connected to the lower ends of the material storage cylinders, and inspection ports are respectively provided on the sides of the material storage cylinders, the two auger screw conveyors are connected to the same sand mixing cylinder, a conveyor is connected to the lower end of the sand mixing cylinder, an elevator is connected to the other end of the conveyor, a mixing drum is connected to the upper end of the elevator, and the dust removal device is connected to the elevator and the mixing drum through a pipe; The upper end of the sand mixing cylinder is provided with a top cover, which is fixedly connected to the auger screw conveyor. The lower end of the top cover is provided with a primary sand mixing component, and the lower end of the primary sand mixing component is connected to a secondary sand mixing component. The lower end of the secondary sand mixing component is provided with a fixing frame, and the upper end of the fixing frame is fixed with a drive motor. The drive motor is connected to the primary sand mixing component and the secondary sand mixing component in a transmission connection. The fixing frame is fixed on the sand mixing cylinder.

[0005] Preferably, the primary sand mixing component includes a collecting cylinder and a chassis. The collecting cylinder is fixed on the chassis. Multiple discharge ports are provided on the outer side of the collecting cylinder along its circumference. Notches are provided at both ends of the bottom of each discharge port. Insert plates are inserted into the interior of each discharge port. Inclined grooves are provided on the insert plates.

[0006] Preferably, the collecting cylinder is provided with a rotating fixed ring, which is fixedly connected to the upper cover. The fixed ring is provided with multiple rollers along its circumference, which are slidably connected inside the groove. The number of rollers is less than the number of collecting cylinders. The lower end of the fixed ring is fixedly connected with cross-shaped stirring comb teeth.

[0007] Preferably, the upper end of the chassis is provided with multiple mixing rings, which are located on the outer side of the collecting cylinder. The inner side of the outermost mixing ring is provided with multiple leakage holes along its circumference. The bottom of the leakage holes is chamfered. The lower end of the chassis is provided with multiple triangular blocks along its circumference, which are located between each pair of leakage holes.

[0008] Preferably, the secondary sand mixing component includes a conical disc with a discharge port in the center. Multiple guide strips and dispersing blocks are fixed along the circumference of the upper end of the conical disc, and the guide strips are inclined.

[0009] Preferably, the upper end of the conical disc is provided with two symmetrical unblocking cylinders, the unblocking cylinders are provided with springs inside, the upper end of the unblocking cylinders is connected to an unblocking ball, the unblocking ball can slide inside the unblocking cylinder, and the unblocking cylinders correspond to the leakage holes on the primary sand mixing component.

[0010] Preferably, the dispersion block has several through holes, and the conical disk is rotatably connected to the sand mixing cylinder.

[0011] Preferably, a driven wheel is fixed at the lower end of the conical disk, and multiple transmission wheels are connected to the inner side of the driven wheel along its circumference, and the transmission wheels are rotatably connected to the conical disk.

[0012] Preferably, the output end of the drive motor is connected to a drive shaft, a spiral blade is fixedly connected to the drive shaft, a gap is provided between the spiral blade and the discharge port, and the bottom of the spiral blade is flush with the bottom of the discharge port. A drive wheel is fixed on the drive shaft, and the drive wheel is connected to the drive wheel.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The device features convenient material storage and stable conveying functions. The two parallel material storage cylinders at the top of the frame can store sand or auxiliary materials of different components respectively, effectively avoiding the imbalance of proportions caused by pre-mixing of materials and improving the mixing accuracy. The design of simultaneous supply from the dual cylinders greatly improves the feeding efficiency. The matching screw conveyor adopts a closed structure, which can realize the quantitative and stable conveying of sand, prevent sand spillage and conveying volume fluctuations, and reduce dust overflow, taking into account both practicality and environmental protection. The inspection port on the side of the material storage cylinder facilitates regular cleaning and maintenance by the staff, avoids material caking and residue, and ensures long-term stable operation of the equipment.

[0014] 2. The core sand mixing function of the device relies on the synergistic operation of primary and secondary sand mixing components, possessing significant advantages in multi-stage mixing and uniform dispersion. The primary sand mixing component achieves initial dispersion and breaking up of sand through the rotation of the collecting cylinder and the shearing and mixing of the agitator comb. Combined with the alternating opening and closing design of the discharge port, the sand is evenly thrown out and further dispersed through the mixing ring. The conical disc of the secondary sand mixing component rotates in the opposite direction to the collecting cylinder, extending the mixing path. The guide strip, dispersing blocks, and spiral blades work together to achieve deep mixing, screening, and spreading of the sand, greatly improving the uniformity of sand mixing and solving the problem of insufficient mixing in traditional single-stage sand mixing.

[0015] 3. The device features automatic anti-clogging and environmental dust removal functions, effectively solving the problems of blockage and dust pollution during equipment operation. The cooperation between the unblocking cylinder and the triangular block enables automatic unblocking of leaks without manual shutdown for cleaning, ensuring continuous production. The notch at the discharge port and the chamfered edges of the leaks further prevent material residue from causing blockages. The dust removal device is connected to the elevator and mixing drum through pipelines, which can centrally collect the dust generated during sand conveying and mixing, purifying the production environment, protecting the health of workers, and meeting environmental protection production requirements.

[0016] 4. The device features a compact overall design, low energy consumption, and efficient and stable operation. A single drive motor drives two-stage sand mixing components through a transmission shaft, simplifying the equipment structure, reducing energy consumption, and ensuring transmission accuracy to prevent operational deviation and swaying. The cooperation between the conveyor and the elevator enables continuous transfer of sand, while the mixing drum completes the final coating and mixing of sand and binder. The coordinated structure improves sand mixing efficiency and quality, extends equipment service life, and fully meets the high standards required for molding sand in low-pressure casting. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the sand mixing cylinder structure of the present invention; Figure 4 This is a schematic diagram of the explosive structure of the sand mixing cylinder of the present invention; Figure 5 This is a schematic diagram of the primary and secondary sand mixing components of the present invention. Figure 1 ; Figure 6 This is a schematic diagram of the primary and secondary sand mixing components of the present invention. Figure 2 ; Figure 7 This is a schematic diagram of the exploded structure of the primary sand mixing component of the present invention; Figure 8 This is a schematic diagram of the transmission structure of the secondary sand mixing component of the present invention.

[0018] Figure labeling: 1. Frame; 2. Mixing cylinder; 3. Conveyor; 4. Elevator; 5. Mixing drum; 6. Dust removal device; 7. Primary mixing assembly; 8. Secondary mixing assembly; 9. Fixing frame; 11. Material storage cylinder; 12. Screw conveyor; 13. Inspection port; 21. Top cover; 71. Collection cylinder; 72. Insert plate; 73. Discharge port; 74. Notch; 75. Fixing ring; 76. Roller 77. Wheel; 81. Chassis; 82. Conical disc; 83. Guide bar; 84. Dispersing block; 85. Clearing cylinder; 86. Discharge port; 87. Driven wheel; 91. Motor; 92. Drive wheel; 721. Slide groove; 751. Agitating comb teeth; 771. Mixing ring; 772. Leakage hole; 773. Triangular block; 831. Through hole; 841. Clearing ball; 911. Drive shaft; 912. Spiral blade. Detailed Implementation

[0019] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0020] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5A high-efficiency sand mixing device for low-pressure casting is proposed, mainly to solve problems such as low mixing efficiency, poor mixing uniformity, easy clogging, and dust pollution in low-pressure casting production. It enables automated and precise mixing of sand, ensuring the quality of subsequent castings. The device includes a frame 1 and a dust removal device 6. Two parallel material storage cylinders 11 are installed on the upper end of the frame 1. These two cylinders can store sand or auxiliary materials of different components, effectively avoiding the imbalance caused by premature mixing of different materials and improving the accuracy of sand mixing. Simultaneously, the dual-cylinder design allows for the simultaneous supply of two materials, significantly improving sand mixing efficiency and solving the problems associated with traditional single-cylinder systems. The material storage cylinder 11 overcomes the drawbacks of single-source and low-efficiency feeding. The lower end of each cylinder is connected to a screw conveyor 12, which employs a closed conveying structure. This not only ensures stable and quantitative conveying of sand, avoiding spillage and unstable conveying volume issues common in traditional methods, but also effectively reduces dust overflow during sand conveying, balancing environmental friendliness and practicality. Furthermore, the material storage cylinder 11 has inspection ports 13 on its sides, facilitating regular cleaning and maintenance by personnel. This prevents material from clumping and remaining inside the cylinder, ensuring long-term stable operation and solving the problems associated with traditional equipment inspection methods. The problem of inconvenient repair and the ease with which material residue can affect the sand mixing effect is addressed by connecting the two auger screw conveyors 12 to the same sand mixing cylinder 2. This allows for the synchronous conveying and centralized mixing of the two materials, avoiding insufficient uniformity caused by batch mixing and further improving sand mixing efficiency. A conveyor 3 is connected to the lower end of the sand mixing cylinder 2, which quickly transports the pre-mixed sand to the next process, preventing sand from accumulating and clumping at the bottom of the cylinder and ensuring the continuity of the sand mixing process. An elevator 4 is connected to the other end of the conveyor 3, which vertically lifts the sand to a specified height, solving the problem of the difficulty in vertically conveying sand. The system addresses the issues of low efficiency and easy spillage in sand mixing, achieving efficient sand transport. The upper end of the elevator 4 is connected to a mixing drum 5, which adds binder to the initially mixed sand and performs final mixing, ensuring the binder fully coats and evenly mixes the sand, improving the strength and permeability of the molding sand. This solves the problems of insufficient binder mixing and unstable molding sand quality in traditional sand mixing. The dust removal device 6 is connected to the elevator 4 and mixing drum 5 via pipelines, centrally collecting dust generated during sand transport and mixing, purifying the production environment, protecting the health of workers, and solving the problem of severe dust pollution and non-compliance with environmental protection requirements in traditional sand mixing devices.

[0021] Please see Figure 4 , Figure 5 , Figure 6 and Figure 7The upper end of the sand mixing cylinder 2 is provided with a top cover 21, which seals the sand mixing cylinder 2, reduces sand splashing and dust overflow during the sand mixing process, and provides stable installation support for the upper components, solving the problems of sand waste and dust diffusion during the sand mixing process. The top cover 21 is fixedly connected to the auger screw conveyor 12 to ensure the sealing and connection stability during the conveying process and prevent sand from spilling at the conveying interface. The lower end of the top cover 21 is provided with a primary sand mixing component 7, which is used to initially disperse and stir the sand, break up sand clumps, and lay the foundation for subsequent secondary deep mixing, solving the problems of initial sand clumping and high mixing difficulty. The lower end of the primary sand mixing component 7 is connected to a secondary sand mixing component 8, which is used to deeply stir and disperse the initially mixed sand, further improving the uniformity of the sand and solving the shortcomings of insufficient mixing in traditional single-stage sand mixing. A fixing frame 9 is provided at the lower end of the device. The fixing frame 9 serves to fix and support the driving component, ensuring the transmission accuracy between the driving component and the sand mixing assembly, preventing deviation and shaking during equipment operation, and improving the stability of equipment operation. A drive motor 91 is fixed at the upper end of the fixing frame 9. The drive motor 91 provides power for the operation of the entire sand mixing device, replacing the traditional manual stirring or single drive method, greatly improving sand mixing efficiency, reducing labor costs, and solving the problems of low efficiency and high labor intensity of traditional sand mixing methods. The drive motor 91 is connected to the primary sand mixing assembly 7 and the secondary sand mixing assembly 8, realizing the collaborative work of two sand mixing assemblies driven by a single power source, simplifying the equipment structure, reducing equipment energy consumption, and solving the problems of multiple power source drives, high energy consumption, and complex structure of traditional equipment. The fixing frame 9 is fixed on the sand mixing cylinder 2, further improving the overall stability of the equipment, ensuring the transmission synchronization between the driving component and the sand mixing assembly, and ensuring stable sand mixing effect.

[0022] Please see Figure 5 , Figure 6 and Figure 7The primary sand mixing assembly 7 includes a collecting cylinder 71 and a base plate 77. The collecting cylinder 71 is fixed on the base plate 77, and the two rotate synchronously to ensure a smooth transition of sand from the collecting cylinder 71 to the base plate 77, preventing sand accumulation at the junction and solving the problem of sand accumulation and blockage during transport. Multiple discharge ports 73 are evenly distributed along the circumference of the collecting cylinder 71, allowing sand to be thrown out from different directions, achieving initial dispersion of the sand and preventing sand agglomeration, thus solving the problem of uneven sand dispersion in traditional sand mixing devices. Notches 74 are provided at both ends of the bottom of each discharge port 73, effectively preventing sand residue and clumping at the edges of the discharge port 73, thus preventing sand from... The discharge port 73 is blocked to ensure smooth discharge of sand, solving the problem of easy clogging and the need for manual cleaning. Insert plates 72 are inserted into the interior of the discharge port 73 to control its opening and closing, enabling intermittent sand discharge, extending the mixing time of the sand in the collecting cylinder 71, and improving the initial mixing effect. The discharge speed can also be adjusted according to the sand mixing requirements, enhancing the equipment's flexibility. Inclined grooves 721 are provided on the insert plates 72, providing a stable sliding trajectory for subsequent rolling components, enabling automatic lifting and lowering of the insert plates 72 without manual operation, improving the equipment's automation level and solving the problems of traditional manual opening and closing of the discharge port 73, which are cumbersome and inefficient.

[0023] Please see Figure 5 , Figure 6 , Figure 7 and Figure 8The collecting cylinder 71 is provided with a rotatably connected fixing ring 75. The fixing ring 75 rotates relative to the collecting cylinder 71, which does not affect the normal rotation of the collecting cylinder 71, and provides stable support for the stirring component, solving the problem of unstable installation of the stirring component and affecting the stirring effect. The fixing ring 75 is fixedly connected to the upper cover 21, ensuring that the fixing ring 75 remains stationary during equipment operation, providing a stable installation base for the stirring comb 751. The fixing ring 75 is provided with multiple rollers 76 along its circumference. The rollers 76 are slidably connected inside the slide groove 721. Through the cooperation of the rollers 76 and the slide groove 721, the rotation of the collecting cylinder 71 drives the insert plate 72 to automatically rise and fall, realizing... The intermittent opening and closing of the discharge port 73 replaces traditional manual operation, saving manpower and improving work efficiency. The number of rollers 76 is less than the number of collecting cylinders 71, allowing multiple discharge ports 73 to open and close alternately, avoiding uneven mixing caused by the simultaneous discharge of large amounts of sand, and further improving the initial dispersion effect of the sand. The lower end of the fixing ring 75 is fixedly connected with a cross-shaped stirring comb 751. When the collecting cylinder 71 rotates, the stirring comb 751 shears and stirs the sand in the cylinder, breaking up sand clumps and achieving initial mixing of the sand. At the same time, it can scrape off residual sand on the inner wall of the collecting cylinder 71, avoiding material waste and solving the problems of easy agglomeration, insufficient mixing, and material residue of traditional sand.

[0024] Please see Figure 5 , Figure 6 and Figure 7 The upper end of the chassis 77 is provided with multiple mixing rings 771, which are located on the outer side of the collecting cylinder 71. These multiple mixing rings 771 can repeatedly block and disperse the sand material ejected from the discharge port 73, breaking up any agglomerated sand material and further improving the dispersion effect. This prevents sand agglomeration from affecting subsequent mixing and solves the problem of incomplete sand dispersion. The inner side of the outermost mixing ring 771 has multiple perforations 772 along its circumference. These perforations 772 allow some sand material to fall into the secondary sand mixing component 8 in advance, achieving batch mixing of the sand material, extending the sand mixing path, and improving mixing uniformity. Simultaneously, the sand falling speed can be adjusted to avoid overloading of the secondary sand mixing component 8; the bottom of the leakage hole 772 is chamfered, which can prevent sand from remaining or clogging at the edge of the leakage hole 772, ensuring smooth sand falling and solving the problem of easy clogging of the leakage hole 772 and affecting the sand transfer efficiency; the lower end of the chassis 77 is provided with multiple triangular blocks 773 along its circumference, and the triangular blocks 773 are located between each pair of leakage holes 772. The triangular blocks 773 are used to cooperate with the subsequent unclogging component to achieve automatic unclogging, and at the same time can drive the chassis 77 to vibrate slightly, promote the falling of sand, and prevent sand from remaining on the chassis 77.

[0025] Please see Figure 5 , Figure 6 and Figure 7The secondary sand mixing component 8 includes a conical disc 81. The conical disc 81 has a conical structure with a low center and high edges, which can guide the sand to gather towards the center, facilitate the concentrated falling of the sand, and avoid the sand from accumulating at the edges, thus solving the problems of sand residue on the sand mixing component and uneven mixing. The conical disc 81 has a discharge port 85 in the center, which is used to discharge the deeply mixed sand to the conveyor 3, ensuring the continuity of the sand mixing process. Multiple guide strips 82 and dispersing blocks 83 are fixed along the circumference of the upper end of the conical disc 81. The guide strips 82 are inclined. When the conical disc 81 rotates, the inclined guide strips 82 can not only stir the sand, but also guide the sand to move towards the central discharge port 85, improve the sand falling efficiency, and at the same time avoid sand residue on the conical disc 81, thus solving the problems of slow sand falling and easy residue.

[0026] Please see Figure 5 , Figure 6 and Figure 7 The upper end of the conical disc 81 is provided with two symmetrical unblocking cylinders 84. A spring is installed inside each unblocking cylinder 84, and an unblocking ball 841 is connected to the upper end of each cylinder. The unblocking ball 841 can slide inside the unblocking cylinder 84. The unblocking cylinder 84 corresponds to the leakage hole 772 on the primary sand mixing component 7. When the chassis 77 rotates, the triangular block 773 periodically squeezes the unblocking ball 841, compressing the spring. When the triangular block 773 disengages from the unblocking ball 841, the spring pushes the unblocking ball 841 to pop out quickly, impacting the blockage sand at the leakage hole 772, achieving automatic unblocking without manual shutdown for cleaning, ensuring continuous operation of the equipment, and solving the problem of easy clogging of leakage holes and reduced production efficiency in traditional sand mixing devices. Simultaneously, the impact of the unblocking ball 841 can also cause the chassis 77 to vibrate slightly, promoting sand falling and further improving sand mixing efficiency.

[0027] Please see Figure 5 , Figure 6 and Figure 7 The dispersing block 83 has several through holes 831, which allow some sand to pass through, thus achieving sand screening and dispersion. This separates large sand particles from small sand particles and allows for re-mixing, preventing sand agglomeration and further improving the uniformity of sand mixing. This solves the problems of uneven sand particle size and insufficient mixing. The conical disc 81 is rotatably connected to the sand mixing cylinder 2, ensuring the stability of the conical disc 81's rotation and preventing shaking or deviation during operation. This ensures stable mixing effect and solves the problem of unstable rotation of the sand mixing component, which affects the quality of sand mixing.

[0028] Please see Figure 5 , Figure 6 and Figure 8The lower end of the conical disk 81 is fixed with a driven wheel 86. Multiple transmission wheels 87 are connected to the inner side of the driven wheel 86 along its circumference. The transmission wheels 87 are rotatably connected to the conical disk 81 and play the role of transmitting power, ensuring that the power is stably transmitted to the conical disk 81, realizing the smooth rotation of the conical disk 81, avoiding sand mixing stagnation caused by power transmission interruption, and solving the problems of unstable power transmission and easy equipment failure. At the same time, the multiple transmission wheels 87 are evenly distributed, which can make the conical disk 81 uniformly stressed and extend the service life of the equipment.

[0029] Please see Figure 6 , Figure 7 and Figure 8 The output end of the drive motor 91 is connected to a drive shaft 911, which transmits power from the drive motor 91, ensuring efficient power transmission to all transmission components and solving the problems of high power transmission loss and low efficiency. A spiral blade 912 is fixedly connected to the drive shaft 911. A gap is provided between the spiral blade 912 and the discharge port 85, and the bottom of the spiral blade 912 is flush with the bottom of the discharge port 85. When the spiral blade 912 rotates, it can lift and scatter the sand material at the center of the conical disc 81 upwards, achieving further dispersion and mixing of the sand material, further improving efficiency. The mixing is uniform, and the sand is prevented from clogging at the discharge port 85, ensuring smooth sand flow and solving the problems of easy clogging at the discharge port 85 and insufficient sand mixing. The drive shaft 911 is fixed with a drive wheel 92, which is connected to the drive wheel 87. Through the cooperation of the drive wheel 92, the drive wheel 87 and the driven wheel 86, the drive shaft 911 drives the conical disk 81 to rotate in the opposite direction, so that the conical disk 81 and the collection cylinder 71 rotate in opposite directions, extending the sand mixing path and enhancing the mixing effect. This solves the problems of short mixing path and insufficient mixing in traditional sand mixing devices.

[0030] In summary, the various structures work together to achieve automated, multi-stage mixing of sand. The initial dispersion and stirring of the primary sand mixing component 7 and the deep mixing of the secondary sand mixing component 8 significantly improve the uniformity of sand mixing. The automatic unblocking structure design avoids equipment blockage and ensures production continuity. The combination of closed conveying and dust removal device 6 solves the problem of dust pollution. The dual sand mixing components driven by a single power source reduce energy consumption and equipment complexity, thereby improving overall sand mixing efficiency and quality, meeting the high standards of low-pressure casting for molding sand, and reducing labor costs and environmental pressure.

[0031] When using this invention: First, check the sealing and stability of the connections of each component of the device, confirm that the frame 1 is firmly fixed, the conveying channels of the auger screw conveyor 12, conveyor 3, and elevator 4 are not blocked, and the pipe connections of the dust removal device 6 are unobstructed and the filter components are intact. Then, add the required sand or auxiliary materials through the two material storage cylinders 11 respectively. After adding, check whether the inspection port 13 is tightly closed to prevent dust from overflowing or materials from spilling during operation. At the same time, check the lubrication of the drive motor 91, driven wheel 86, transmission wheel 87, drive wheel 92, etc. of each transmission component to ensure that the equipment can operate normally.

[0032] Connect the main power supply of the device and start the dust removal device 6 first to put it into working condition in advance, in preparation for dust control during the subsequent sand conveying and mixing process; then start the drive motor 91, which transmits power through the transmission shaft 911, and drives the primary sand mixing component 7 and the secondary sand mixing component 8 to start working. After the two sand mixing components are running smoothly, start the screw conveyor device 12 to start the material conveying process.

[0033] Primary sand mixing stage: The sand or auxiliary materials in the two material storage cylinders 11 are smoothly and quantitatively conveyed to the mixing cylinder 2 by the corresponding auger screw conveyor 12, and finally enter the collection cylinder 71 of the primary sand mixing component 7. At this time, the drive shaft 911 drives the collection cylinder 71 and the chassis 77 to rotate synchronously. The fixing ring 75 remains stationary because it is fixed to the upper cover 21. The cross-shaped stirring comb 751 at its lower end shears and stirs the rotating sand, breaks up the sand clumps, realizes the initial mixing of sand, and scrapes off the residual sand on the inner wall of the collection cylinder 71. As the collecting cylinder 71 rotates, its outer roller 76 slides along the inclined groove 721 on the insert plate 72, pushing the insert plate 72 to automatically rise and fall, causing multiple discharge ports 73 to open and close alternately. Under the action of centrifugal force, the sand is thrown out from the discharge port 73. The notches 74 at both ends of the discharge port 73 prevent sand residue from affecting the reset of the insert plate 72. The thrown-out sand is blocked and dispersed multiple times by the multiple mixing rings 771 at the top of the chassis 77, breaking up the agglomerated sand. Part of the sand falls into the secondary sand mixing component 8 in advance through the leakage hole 772 on the outermost mixing ring 771, while another part of the sand is thrown out from the edge of the chassis 77 and enters the secondary sand mixing component 8 simultaneously.

[0034] Secondary sand mixing stage: The sand falls onto the conical disc 81 of the secondary sand mixing component 8. At this time, the driving wheel 92 on the drive shaft 911 drives the driven wheel 86 to rotate through the drive wheel 87, causing the conical disc 81 to rotate in the opposite direction to the collecting cylinder 71, thus extending the sand mixing path. When the conical disc 81 rotates, the inclined guide bar 82 at its upper end stirs the sand and guides it towards the central discharge port 85. The through holes 831 on the dispersing block 83 allow some sand to pass through, achieving screening and dispersion of the sand, further improving the mixing uniformity. Simultaneously, the triangular block 773 at the lower end of the chassis 77 rotates with the chassis 77, periodically squeezing the unblocking ball 841 inside the unblocking cylinder 84 on the conical disc 81, causing the spring inside the unblocking cylinder 84 to compress. When the triangular block 773 disengages from the unblocking ball 841, the spring pushes the unblocking ball 841 to pop out quickly, impacting the blockage sand at the leakage hole 772, achieving automatic unblocking. At the same time, it causes the chassis 77 to vibrate slightly, promoting the falling of sand. The spiral blade 912 on the drive shaft 911 rotates synchronously, scattering the sand in the center of the conical disc 81 upwards, achieving further dispersion and mixing of the sand. Finally, the sand falls to the bottom of the mixing cylinder 2 through the gap between the discharge port 85 and the spiral blade 912.

[0035] The conveyor 3 at the bottom of the sand mixing drum 2 starts, quickly transporting the sand material after secondary mixing to the elevator 4. The elevator 4 vertically lifts the sand material to a designated height and sends it into the mixing drum 5. Workers add adhesive to the mixing drum 5, which performs a final mixing of the sand and adhesive, ensuring that the adhesive fully coats and evenly mixes the sand material to meet the requirements for low-pressure casting molding sand. During this process, the dust removal device 6 continuously collects dust generated in the elevator 4 and mixing drum 5 through pipelines, filters it, and discharges it, thus purifying the production environment.

[0036] After all the sand has been mixed and transported to the designated location, first shut down the screw conveyor 12 to stop the material supply. After all the sand in the mixing drum 2 and mixing roller 5 has been discharged, continue running the drive motor 91 and dust removal device 6 to clean up any remaining sand and dust. Then, sequentially shut down the drive motor 91 and dust removal device 6, and disconnect the main power supply. Finally, check the material storage drum 11, mixing drum 2, and other components through the inspection port 13 to remove any remaining sand. Simultaneously, check for wear and looseness in each component, and perform timely maintenance to ensure the device functions properly for the next use.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency sand mixing device for low-pressure casting, characterized in that: The system includes a frame (1) and a dust removal device (6). The upper end of the frame (1) is equipped with two parallel material storage cylinders (11). The lower ends of the material storage cylinders (11) are respectively connected to auger screw conveyors (12). The sides of the material storage cylinders (11) are respectively provided with maintenance ports (13). The two auger screw conveyors (12) are connected to the same sand mixing cylinder (2). The lower end of the sand mixing cylinder (2) is connected to a conveyor (3). The other end of the conveyor (3) is connected to an elevator (4). The upper end of the elevator (4) is connected to a mixing drum (5). The dust removal device (6) is connected to the elevator (4) and the mixing drum (5) through a pipe. The upper end of the sand mixing cylinder (2) is provided with a top cover (21), which is fixedly connected to the screw conveyor (12). The lower end of the top cover (21) is provided with a primary sand mixing component (7), and the lower end of the primary sand mixing component (7) is connected to a secondary sand mixing component (8). The lower end of the secondary sand mixing component (8) is provided with a fixing frame (9), and the upper end of the fixing frame (9) is fixed with a drive motor (91). The drive motor (91) is connected to the primary sand mixing component (7) and the secondary sand mixing component (8) in a transmission connection. The fixing frame (9) is fixed on the sand mixing cylinder (2).

2. The high-efficiency sand mixing device for low-pressure casting according to claim 1, characterized in that: The primary sand mixing component (7) includes a collection cylinder (71) and a chassis (77). The collection cylinder (71) is fixed on the chassis (77). Multiple discharge ports (73) are provided on the outer side of the collection cylinder (71) along its circumference. Notches (74) are provided at both ends of the bottom of the discharge ports (73). Insert plates (72) are inserted into the interior of the discharge ports (73). Inclined grooves (721) are provided on the insert plates (72).

3. The high-efficiency sand mixing device for low-pressure casting according to claim 2, characterized in that: The collecting cylinder (71) is provided with a rotating fixed ring (75), which is fixedly connected to the upper cover (21). The fixed ring (75) is provided with multiple rollers (76) along its circumference. The rollers (76) are slidably connected inside the slide groove (721). The number of rollers (76) is less than the number of collecting cylinders (71). The lower end of the fixed ring (75) is fixedly connected with a cross-shaped stirring comb (751).

4. The high-efficiency sand mixing device for low-pressure casting according to claim 2, characterized in that: The upper end of the chassis (77) is provided with multiple mixing rings (771), the mixing rings (771) are located on the outside of the collecting cylinder (71), and the inner side of the outermost mixing ring (771) is provided with multiple drain holes (772) along its circumference. The bottom of the drain holes (772) is chamfered. The lower end of the chassis (77) is provided with multiple triangular blocks (773) along its circumference, and the triangular blocks (773) are located between each pair of drain holes (772).

5. A high-efficiency sand mixing device for low-pressure casting according to claim 1, characterized in that: The secondary sand mixing component (8) includes a conical disc (81), with a discharge port (85) in the center of the conical disc (81). Multiple guide strips (82) and dispersing blocks (83) are fixed along the circumference of the upper end of the conical disc (81), and the guide strips (82) are inclined.

6. A high-efficiency sand mixing device for low-pressure casting according to claim 5, characterized in that: The upper end of the conical disc (81) is provided with two symmetrical unblocking cylinders (84). The unblocking cylinder (84) is provided with a spring inside. The upper end of the unblocking cylinder (84) is connected to an unblocking ball (841). The unblocking ball (841) can slide inside the unblocking cylinder (84). The unblocking cylinder (84) corresponds to the leakage hole (772) on the primary sand mixing component (7).

7. A high-efficiency sand mixing device for low-pressure casting according to claim 5, characterized in that: The dispersion block (83) has several through holes (831), and the conical disk (81) is rotatably connected to the sand mixing cylinder (2).

8. A high-efficiency sand mixing device for low-pressure casting according to claim 5, characterized in that: The lower end of the conical disk (81) is fixed with a driven wheel (86), and a plurality of transmission wheels (87) are connected to the inner side of the driven wheel (86) along its circumference. The transmission wheels (87) are rotatably connected to the conical disk (81).

9. A high-efficiency sand mixing device for low-pressure casting according to claim 8, characterized in that: The output end of the drive motor (91) is connected to a drive shaft (911), and a spiral blade (912) is fixedly connected to the drive shaft (911). A gap is provided between the spiral blade (912) and the discharge port (85), and the bottom of the spiral blade (912) is flush with the bottom of the discharge port (85). A drive wheel (92) is fixed on the drive shaft (911), and the drive wheel (92) is connected to the drive wheel (87).

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