Intelligent rotary unloading door for planetary rotor sand mixer

Abstract

The present application relates to the technical field of sand mixer, and provides an intelligent rotary unloading door for a planetary rotor type sand mixer, which comprises a rotating carrier rotatably arranged on the inner side of a box body; a movable door slidingly nested in the rotating carrier and having a sealing surface; a driving mechanism arranged on the outer side of the box body and configured to sequentially drive the movable door to radially contract and the rotating carrier to circumferentially rotate; a cleaning mechanism arranged on the bottom of the rotating carrier and configured to actively brush the sealing surface at a preset cleaning station; and a torque sensor and an angle sensor respectively monitoring a transmission torque and a rotation angle to provide a closed state feedback signal. The present application effectively solves the problems of incomplete closure and sand leakage caused by sand clamping through the frictionless opening and closing of contraction first and rotation later and the intelligent closed-loop cleaning.

Description

Technical Field

[0001] This invention relates to the field of sand mixer technology, and specifically to an intelligent rotary unloading gate for a planetary rotor sand mixer. Background Technology

[0002] Currently, in the manufacturing of industrial production equipment, many components need to be made through casting, and the sand mixing process is a key step in the casting process. The quality of the molding sand mixing directly affects the quality of the final casting. In order to improve the mixing efficiency of molding sand and the convenience of discharge, the design of the discharge structure of the sand mixer has always been a focus of attention for those skilled in the art.

[0003] In the molding sand preparation process in the foundry industry, planetary rotor sand mixers, due to the rotational and revolving motion of their rotors, can apply strong crushing and mixing effects to the molding sand, thereby obtaining high-quality mixtures. However, this special working condition also subjects the discharge gate at the bottom of the mixing cylinder to extremely high vibration loads and intense compression of the molding sand.

[0004] In related technologies, to facilitate the discharge of materials after the planetary rotor sand mixer has finished working, for example, the prior art patent with announcement number CN210435111U provides a planetary rotor sand mixer. This device uses a discharge device with a notch formed between the bottom plate and the shell and a baffle plate. The baffle plate is rotated around the connection end with the shell by a hydraulic cylinder, thereby opening or closing the notch to achieve unloading. In order to improve the sealing performance, a protrusion is fixed on the side of the baffle plate near the bottom plate. The bottom plate has a groove for the protrusion to be inserted. The bottom end of the groove has a through hole to discharge impurities. After closing, the positioning pin is inserted into the limiting hole to lock and fix it.

[0005] While the existing technologies described above achieve automatic opening and closing of the discharge gap by rotating a baffle plate at the bottom of the sand mixer, the fit between the protrusion and the groove is rigid when the baffle plate is closed. However, in actual operation, due to the strong abrasiveness and adhesiveness of molding sand, coupled with increased viscosity at higher moisture content, sand particles easily become stuck between the mating surfaces of the protrusion and groove. When the discharge gate closes, the residual hard sand prevents the baffle plate from fully closing, resulting in severe sand leakage during the operation of the sand mixer. Simultaneously, the relative shearing motion between the rigid mating surfaces exacerbates wear on the sealing surfaces, further deteriorating the sealing performance. Although some existing technologies have perforations at the bottom of the groove to attempt to remove impurities, this passive sand discharge structure is prone to clogging and failure for high-viscosity wet sand, failing to fundamentally solve the problem of incomplete closure caused by sand inclusion. Summary of the Invention

[0006] To address the problems of incomplete closure and sand leakage caused by sand trapping on the rigid mating surface of the unloading gate in the existing planetary rotor sand mixer, this application achieves frictionless opening and closing and adaptive cleanliness assurance of the sealing surface through an intelligent rotary unloading gate for the planetary rotor sand mixer.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: An intelligent rotary discharge gate for a planetary rotor sand mixer includes: The rotating carrier is rotatably mounted inside the box at the bottom of the mixing cylinder; The movable door is slidably nested within the rotating carrier, and the movable door has a sealing surface for sealing the discharge port; The drive mechanism, located on the outside of the housing, is configured to sequentially execute: drive the movable door to retract radially so that the sealing surface disengages from the discharge port, and drive the rotating carrier to rotate circumferentially to open the discharge port; A cleaning mechanism is located at the bottom of the rotating carrier and is configured to actively brush the sealing surface when the movable door rotates to a preset cleaning position. The torque sensor and the angle sensor are configured to monitor the transmission torque of the drive mechanism and the rotation angle of the rotating carrier, respectively, to provide a closed-state feedback signal.

[0008] This invention slides the movable door within a rotating carrier, and the drive mechanism sequentially performs two actions: radial contraction and circumferential rotation. This allows the movable door to disengage from the discharge port sealing surface before opening, eliminating the relative shear friction between the sealing surface and the discharge port in traditional flipping or translational structures. This fundamentally avoids the risk of sand trapping during the opening and closing process. Simultaneously, in conjunction with the cleaning mechanism's active brushing of the sealing surface at specific workstations and the real-time status feedback provided by torque and angle sensors, a dual protection system combining mechanical anti-jamming and intelligent sensing is constructed.

[0009] Preferably, the driving mechanism includes a rotary driving component and a linkage guide component; The linkage guide components are located on both sides of the rotating carrier and are rotatably configured to rotate with the rotating carrier. The linkage guide component is provided with an arc-shaped guide groove, and the movable door is provided with a guide pin that slides in cooperation with the arc-shaped guide groove; A tension spring is provided at the bottom of the movable door, and the other end of the tension spring is fixed to the inside of the rotating carrier; When the rotary drive is in operation, the contour change of the arc-shaped guide groove first drives the movable door to retract radially, and after the movable door retracts to the preset position, it drives the rotating carrier to rotate circumferentially.

[0010] By utilizing the contour curve of the arc-shaped guide groove as a mechanical timing controller, a single rotary input is transformed into an output trajectory of "contraction first, then rotation". This ensures the determinism and reliability of the action execution without the need for complex electronic timing control, effectively preventing malfunctions caused by control logic errors. Meanwhile, the tension spring provides a constant preload for the door's reset, ensuring that the door can tightly fit the sealing surface after contraction and release.

[0011] Preferably, the rotary drive component includes a worm gear, a worm, a gear, and a toothed plate; The worm gear is located on the outside of the housing and is connected to the center of the outside of the linkage guide component via a drive shaft; The worm meshes with the worm wheel, the gear is located at the end of the worm away from the worm wheel, and the gear plate meshes with the gear and is driven to move up and down by external force.

[0012] The combination of worm gear and gear plate transmission chain realizes power transmission with large reduction ratio and self-locking function, ensuring stable suspension of the unloading gate at any position.

[0013] Preferably, the cleaning mechanism includes a lifting assembly and a reciprocating brush assembly; When the rotating carrier rotates to the preset cleaning station, the lifting component is configured to drive the reciprocating brushing component to approach the sealing surface, and the reciprocating brushing component is configured to perform linear reciprocating brushing on the sealing surface.

[0014] This design, through the coordinated freedom of lifting and brushing, allows the cleaning mechanism to intervene only when needed. This avoids interference with the unloading process when not in operation, and enables high-intensity directional cleaning of the sealing surface at the cleaning station, effectively removing the adhering high-viscosity wet sand.

[0015] Preferably, the reciprocating brush assembly includes two cleaning brushes, a connecting plate A is provided between the two cleaning brushes, and a connecting plate B is provided on the outer side of the connecting plate A; The bottom of the cleaning brush is provided with a slide bar A, which is slidably disposed inside the slide rail B, and the slide rail B is disposed at the top of the connecting frame; The lifting assembly includes a drive motor, a drive shaft, a crankshaft, a connecting rod, and a slide column; The output end of the drive motor is linked to the drive shaft. The drive shaft is fixedly connected to one end of the crankshaft. The other side of the crankshaft is rotatably connected to one end of the connecting rod. The other end of the connecting rod is rotatably connected to the sliding column. The sliding column is located at the bottom of the connecting plate B. The drive motor is configured to drive the connecting rod through the drive shaft and crankshaft, so as to convert the rotational motion into the linear reciprocating motion of the connecting plate B and the connecting plate A.

[0016] The crank-slider mechanism efficiently converts the rotational motion of the motor into the linear reciprocating motion of the cleaning brush, resulting in a simple, compact structure that is easy to maintain. The symmetrical arrangement of the two cleaning brushes, along with the guide rail, ensures the uniformity of the brushing force and the smoothness of the movement.

[0017] Preferably, the sealing surface of the movable door is provided with a stepped structure, and the corresponding position of the discharge port is provided with a stepped groove or a planar structure; In the closed state, the stepped structure is directly and sealed to the bottom plane of the discharge port, replacing the rigid insertion fit between the protrusion and the groove.

[0018] By replacing the traditional interlocking seal with a flat mating seal, the sand-containing space between the mating surfaces is completely eliminated. This allows any loose sand to be scraped off or squeezed out by the edge of the step during the closing process, significantly improving the anti-pollution capability of the sealing structure.

[0019] Preferably, the top of the rotating carrier has an opening, the movable door is slidably disposed inside the opening, and the two sides of the opening are provided with step grooves corresponding to the step structure; Both sides of the box are provided with side plates, and the inner side of the side plates is provided with a number of air blowing holes corresponding to the cleaning mechanism. The air blowing holes are configured to be connected to an external high-pressure air source to blow away the residual molding sand on the cleaning mechanism.

[0020] By introducing high-pressure airflow to assist cleaning, fine dust in the gaps between brush bristles and dead corners can be further removed on the basis of mechanical brushing, preventing the cleaning mechanism itself from accumulating sand and clumping, which would affect the subsequent cleaning effect, thus forming a cleaning mechanism that combines mechanical and pneumatic processes.

[0021] Furthermore, this invention also provides a control method for an intelligent rotary discharge gate for a planetary rotor sand mixer, applied to the intelligent rotary discharge gate as described above, comprising: During the closing process of the movable door, the transmission torque of the drive mechanism is monitored in real time by the torque sensor; In response to an abnormal increase in the transmission torque, it is determined that there is sand trapped between the sealing surface and the discharge port. The drive mechanism is then controlled to pause closing and reopen the intelligent rotary unloading door. After the intelligent rotary unloading door reopens, the cleaning mechanism is triggered to perform a secondary cleaning action on the sealing surface; After the secondary cleaning is completed, the drive mechanism is controlled again to perform the closing action until the angle sensor reports that the rotating carrier has returned to its correct position and the torque sensor reports that the closing torque is within the normal range, thus completing the intelligent sealing closure.

[0022] The above method establishes a closed-loop re-cleaning logic based on torque feedback, which enables the unloading gate to autonomously detect sand inclusion faults and automatically repair them, upgrading the traditional passive mechanical protection to active intelligent protection and ensuring the sealing reliability of the equipment during long-term operation under harsh conditions.

[0023] Preferably, determining that there is sand inclusion between the sealing surface and the discharge port includes: The real-time monitored transmission torque is compared with a preset torque threshold. When the transmission torque is greater than the preset torque threshold, or the rate of change of the transmission torque exceeds a preset rate of change threshold, it is determined that sand inclusion exists. Triggering the cleaning mechanism to perform a secondary cleaning action on the sealing surface includes: The lifting assembly is controlled to drive the reciprocating brush assembly to rise to a working position close to the sealing surface, and the reciprocating brush assembly is controlled to perform at least one complete linear reciprocating brush cycle.

[0024] This preferred solution refines the sand inclusion criteria and re-cleaning execution strategy. It improves the accuracy of fault identification through dual threshold judgment and avoids false triggering. The clear secondary cleaning sequence ensures the effectiveness of each re-cleaning action and prevents invalid loops.

[0025] In addition, the present invention also provides a planetary rotor sand mixer, comprising: a sand mixing cylinder, wherein at least one discharge port is provided at the bottom of the sand mixing cylinder; and an intelligent rotary discharge gate as described above, wherein the intelligent rotary discharge gate is disposed at the bottom of the sand mixing cylinder, and the sealing surface of the movable gate is used to seal the discharge port.

[0026] Beneficial effects: The intelligent rotary discharge gate for planetary rotor sand mixers provided by this invention has the following significant advantages compared to existing technologies: (1) The force pattern of the unloading gate is fundamentally changed by the motion trajectory design of "radial contraction first and circumferential rotation". The movable gate separates from the sealing surface of the discharge port in the normal direction at the moment of opening, which completely eliminates the sand squeezing and wear problems caused by relative sliding friction in the traditional structure, greatly extends the service life of the seals, and creates unobstructed conditions for smooth unloading in the future.

[0027] (2) A triple anti-sand physical barrier is used, consisting of "mechanical planar sealing, active cleaning at the workstation, and pneumatic assisted purging". The stepped planar bonding structure eliminates dead corners for sand accumulation; the reciprocating brushing mechanism at specific workstations forcibly removes high-viscosity wet sand; and the high-pressure airflow further purifies and cleans the components themselves. This ensures that even under extreme working conditions with high moisture content and strong viscosity of molding sand, the sealing surface remains clean, effectively preventing sand leakage caused by foreign objects.

[0028] (3) An intelligent closed-loop control mechanism based on multi-dimensional sensor feedback was introduced. The system can sense the torque abnormality during the closing process in real time and automatically trigger the self-healing process of "pause-reopen-secondary cleaning-retry". This intelligent fault-tolerant design not only solves the problem of occasional hard sand jamming, but also avoids mechanical damage caused by forced closing, significantly improving the operational stability and intelligence level of the equipment and reducing manual maintenance costs. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of the intelligent rotary unloading gate and sand mixing cylinder according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the intelligent rotary unloading gate and the discharge port according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the intelligent rotary unloading gate and the discharge port separated according to an embodiment of the present invention; Figure 4 This is an exploded structural diagram of the intelligent rotary unloading gate according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the assembly structure of the rotating carrier, movable door, drive mechanism and cleaning structure according to an embodiment of the present invention; Figure 6 This is a partial structural diagram of the rotating carrier, movable door, drive mechanism and cleaning structure assembly according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the rotating carrier and the movable door separated according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the reciprocating brush component structure according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the assembly structure of the box body and the feeding cylinder according to an embodiment of the present invention; Figure 10 A schematic diagram of the exploded structure of the box in an embodiment of the present invention.

[0030] in: 100 - Sand mixing cylinder; 110 - Discharge port; 200-Box body; 210-Air blowing hole; 220-Circular groove A; 230-Circular groove B; 240-Sliding pin A; 250-Slide rail A; 260-Feeding cylinder; 300 - Rotating carrier; 310 - Arc-shaped groove; 400 - Sliding door; 410 - Sealing surface; 420 - Guide pin; 430 - Tension spring; 500-Drive mechanism; 510-Rotary drive component; 511-Worm gear; 512-Worm; 513-Gear; 514-Gear plate; 515-Electric push rod; 520-Linkage guide component; 521-Arc-shaped guide groove 600-Cleaning mechanism; 610-Lifting assembly; 611-Drive motor; 612-Drive shaft; 613-Crankshaft; 614-Connecting rod; 615-Slide column; 620-Reciprocating brush assembly; 621-Cleaning brush; 622-Connecting plate A; 623-Connecting plate B; 624-Slide bar A; 625-Slide rail B; 626-Connecting frame; 700-torque sensor; 800-Angle sensor. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0033] like Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides an intelligent rotary discharge gate for a planetary rotor sand mixer. This discharge gate serves as a key discharge control unit at the bottom of the planetary rotor sand mixer, and its overall architecture aims to solve the technical problems of easy jamming and sealing failure of the discharge gate under high-viscosity molding sand conditions. The intelligent rotary discharge gate includes a rotating carrier, a movable gate, a drive mechanism, a cleaning mechanism, and a sensing feedback component.

[0034] Among them, such as Figure 6 , Figure 7 , Figure 10As shown, the rotating carrier 300 is rotatably disposed inside the box 200 at the bottom of the mixing cylinder 100, serving as the moving base and bearing platform for the entire unloading gate. Specifically, the rotating carrier 300 is configured within the box 200 to rotate circumferentially around a predetermined axis, thereby driving the components housed within it to switch between different workstations. It should be understood that although the rotating carrier 300 is preferably a cylindrical roller structure in this embodiment, in other embodiments, it can also be a polygonal cylinder or other carrier structure capable of accommodating the movable gate and realizing rotational movement, as long as it can provide stable rotational support for the movable gate. Specifically, in this embodiment, the rotating carrier 300 is a roller structure, with arc-shaped grooves (310) on both sides of the roller. A circular groove A (220) is provided on the inner side of the housing (200). Side plates are fixedly provided on both sides of the housing (200), with a circular groove B (230) on the inner side of the side plates. The roller is rotatably disposed within the circular grooves A (220) and B (230). A sliding pin A (240) is fixedly provided on the inner side of the circular groove B (230), and the sliding pin A (240) slides with the arc-shaped groove (310). A sealing sleeve is fitted on the outer side of the roller. A feeding cylinder 260 is provided at the lower end of the housing 200.

[0035] The movable door 400 is slidably nested within the rotating carrier 300, and the movable door 400 has a sealing surface 410 for sealing the discharge port 110. This "sliding nesting" constitutes the core dual-degree-of-freedom motion system of this invention: on the one hand, the movable door 400 can synchronously revolve around the rotating carrier 300; on the other hand, the movable door 400 can also independently extend and retract relative to the rotating carrier in the radial direction. This composite motion design aims to decouple the traditional "single-axis flip opening and closing" into two independent actions: "radial separation + circumferential avoidance." This allows the sealing surface 410 of the movable door 400 to normally disengage from or contact the discharge port 110 before the rotational action at the moment of opening or closing, thereby completely eliminating the relative shear friction between the sealing surface 410 and the edge of the discharge port 110 under pressure, and fundamentally preventing molding sand embedding and sealing surface wear caused by rigid scraping.

[0036] like Figure 4 , Figure 5 , Figure 6As shown, the drive mechanism 500 is located on the outside of the housing 200 and is configured to perform the following actions sequentially: first, drive the movable door 400 to retract radially so that the sealing surface disengages from the discharge port 110; then drive the rotating carrier 300 to rotate circumferentially to open the discharge port 110. This sequential execution timing logic is the key control strategy for achieving frictionless opening and closing in this embodiment. Specifically, during the opening process, the drive mechanism 500 forces the movable door to retract inward first, ensuring that the sealing surface 410 completely leaves the sealing area of ​​the discharge port 110 and forms a safe gap before starting the rotation of the rotating carrier 300; conversely, during the closing process, the rotating carrier 300 first transports the movable door 400 to directly below the discharge port 201, and after it rotates to the correct position and stops, drives the movable door 400 to extend radially to complete the sealing. This strict timing coordination ensures that the sealing surface 410 and the discharge port 110 are in a non-contact state at any time when there is relative velocity, effectively preventing the molding sand from being squeezed and hardened in the gap of the moving pair, thus preventing jamming failures.

[0037] The cleaning mechanism 600 is located at the bottom of the rotating carrier 400 and is configured to actively brush the sealing surface 410 when the movable door 400 rotates to a preset cleaning position. The "preset cleaning position" refers to a specific angular position on the circumferential trajectory of the rotating carrier 300 that facilitates maintenance operations on the sealing surface 410 of the movable door; in this embodiment, it is preferably the lowest position in the direction of gravity. The necessity of cleaning at this position is twofold: firstly, the movable door 400 has completed its unloading stroke and has not yet entered the closing preparation area, making it the optimal time window for removing residual molding sand; secondly, it facilitates the use of gravity to assist in the discharge of the brushed-off accumulated sand. This on-demand, triggered active cleaning mechanism ensures the cleanliness of the sealing surface before each closure, further improving sealing reliability.

[0038] In addition, the intelligent rotary unloading gate is equipped with a torque sensor 700 and an angle sensor 800, configured to monitor the transmission torque of the drive mechanism 500 and the rotation angle of the rotating carrier 300, respectively, to provide feedback signals on the closing status. These two sensors together constitute the device's sensing layer: the angle sensor 800 is used to confirm in real time whether the rotating carrier has accurately reached the predetermined opening and closing position, preventing malfunctions due to positional deviations; the torque sensor 700 indirectly reflects the contact resistance state between the sealing surface 410 of the movable gate and the discharge port 110 by monitoring load changes on the transmission chain. When an abnormal torque peak occurs during the closing process, it can be determined that there is a risk of sand inclusion. These feedback signals are not only used for current operation monitoring, but also provide the necessary data foundation for the intelligent re-cleaning closed-loop control implemented in subsequent embodiments, enabling the device to upgrade from "mechanical execution" to "adaptive perception."

[0039] In summary, this embodiment establishes the upper-level architecture of the intelligent rotary unloading gate by constructing a four-in-one functional framework of "radial contraction + circumferential rotation + active cleaning + sensor feedback". This architecture does not rely on specific transmission component forms, but fundamentally changes the force mode and maintenance method of the unloading gate through the spatial configuration and temporal coordination of functional modules, providing a systematic technical solution for solving the problem of sand jamming and leakage at the unloading gate of a planetary rotor sand mixer.

[0040] This embodiment further provides a specific mechanical timing linkage drive mechanism to materialize abstract timing control logic into a reliable mechanical structure. Specifically, as follows: Figure 6 , Figure 7 As shown, the drive mechanism 500 includes a rotary drive component 510 and a linkage guide component 520. The linkage guide component 520 is provided with an arc-shaped guide groove 521, and the movable door 400 is provided with a guide pin 420 that slides in conjunction with the arc-shaped guide groove 521. When the rotary drive component 510 rotates, the contour change of the arc-shaped guide groove 521 first drives the movable door 400 to retract radially. After the movable door 400 retracts to the preset position, it drives the rotating carrier 300 to rotate circumferentially. This design transforms a single rotary input motion into a composite output trajectory with a strict sequence. It uses the geometric constraints of the mechanical contour to replace the complex electronic sensor array and multi-motor collaborative control, fundamentally eliminating the risk of erratic operation caused by electrical component failure or signal interference. It is particularly suitable for the harsh working environment of high dust and strong vibration inside the planetary rotor sand mixer.

[0041] like Figure 6 and Figure 7 As shown, in this embodiment, the rotating carrier 300 is specifically implemented as a roller, with rotating plates rotatably arranged on both sides, which serve as the aforementioned linkage guide 520. An arc-shaped guide groove 521 is formed on the inner side of the rotating plate; the movable door 400 is specifically implemented as a feeding frame. The curved profile of the arc-shaped guide groove 521 is specially designed, including an eccentric contraction section and a concentric rotation section. When the linkage guide 520 is driven to rotate, the guide pin 420, guided by the eccentric contraction section, first forces the movable door 400 to overcome resistance and slide inward towards the rotating carrier 300, completing the radial disengagement of the sealing surface 410; after the guide pin 420 enters the concentric rotation section, the movable door 400 and the rotating carrier 300 are locked together, and the door rotates circumferentially synchronously with the linkage guide 520, thereby opening the discharge port 110. This purely mechanical trajectory planning ensures that the "contraction first, rotation later" action sequence has irreversible physical determinism. Even if the control system loses power or malfunctions, as long as the power source continues to input, the door will still move according to the predetermined safe trajectory, avoiding equipment damage caused by malfunction.

[0042] To ensure reliable sealing during the reset phase, a tension spring 430 is fixedly installed at the bottom of the movable door 400, with the other end of the tension spring 430 fixed to the inner side of the rotating carrier 300. Throughout the entire motion cycle, the tension spring 430 provides a constant preload force pointing towards the discharge 110. During the unloading and opening phase, the tension spring 430 stores elastic potential energy; during the closing and reset phase, when the rotating carrier 300 reverses to the eccentric contraction section and releases the guide pin 420, the tension spring 430 releases its stored energy, actively pushing the movable door 400 outwards, ensuring its sealing surface tightly contacts the discharge port. This elastic reset mechanism not only compensates for machining and assembly errors but also automatically maintains sufficient sealing pressure after the sealing surface 410 wears, effectively preventing sand leakage due to increased gaps. It should be understood that although this embodiment preferably uses a tension spring as the reset element, in other embodiments, compression springs, torsion springs, or gas springs, or other elastic energy storage elements, can also be used, as long as they can provide a stable reset driving force.

[0043] Regarding the power transmission path, such as Figure 6 As shown, the rotary drive component 510 includes a worm gear 511, a worm 512, a gear 513, and a toothed plate 514. The worm gear 511 is located on the outside of the housing 200 and is fixedly connected to the center of the outer side of the linkage guide component 520 via a drive shaft. The worm 511 meshes with the worm gear 511. The gear 513 is located at the end of the worm 512 away from the worm gear 511. The toothed plate 514 meshes with the gear 513 and is driven to move up and down by an external force. An external linear driving force (such as an electric push rod) pushes the toothed plate 514 up and down, which is converted into the rotational motion of the worm 512 by the gear 513, and then transmitted to the linkage guide component 520 after being reduced in speed and increased in torque by the worm gear 511. The transmission pair formed by the worm gear 511 and worm 512 has a natural self-locking characteristic. This means that when the toothed plate 514 stops moving, regardless of the angle position of the linkage guide 520 and the movable door 400, the transmission chain cannot be reversed to rotate, thus achieving reliable suspension of the unloading door at any intermediate position. This self-locking function is crucial for dealing with sudden shutdowns or maintenance conditions. It prevents the door from accidentally slipping due to gravity or molding sand pressure, significantly improving the operational safety of the equipment. Compared with the solution of direct drive using a servo motor, this purely mechanical sequential linkage structure is not only lower in cost and easier to maintain, but also shows significant advantages in terms of impact load resistance and environmental interference resistance, providing a solid foundation for ensuring the long-term stable operation of the intelligent rotary unloading door. Specifically, in this embodiment, the external linear driving force is the electric push rod 515, and a slide rail A250 is fixedly installed on the outside of the housing 1. The toothed plate 514 is slidably installed on the outside of the slide rail A250. This embodiment further provides a specific implementation of a workstation-linked active cleaning mechanism 600. For example... Figure 6 and Figure 7As shown, the cleaning mechanism includes a lifting assembly 610 and a reciprocating brush assembly 620. When the rotating carrier 300 rotates to the preset cleaning position, the lifting assembly 610 is configured to drive the reciprocating brush assembly 620 to approach the sealing surface 410, and the reciprocating brush assembly 620 is configured to perform linear reciprocating brushing on the sealing surface 410. This design constructs a dual-degree-of-freedom cleaning mechanism that coordinates "lifting and avoiding" and "reciprocating brushing". Specifically, the lifting assembly 620 gives the cleaning mechanism 600 the ability to maintain a low position and avoid obstacles when not in operation, keeping it completely outside the motion envelope of the rotating carrier and the movable door, thereby completely avoiding mechanical interference of the cleaning components with the normal unloading process, and also preventing the high-speed flowing molding sand from ineffectively scouring and abrading the precision brushing components. Only when the rotating carrier precisely rotates to the preset cleaning position (e.g., the lowest position in the direction of gravity in this embodiment) does the lifting assembly 610 drive the reciprocating brush assembly to rise to the working height, so that the bristles are tightly attached to the sealing surface of the movable door. At this time, the reciprocating brush component 620 forcibly peels off the residual molding sand on the sealing surface 410 through high-frequency linear reciprocating motion. This "on-demand intervention" design not only extends the service life of the cleaning mechanism itself, but also ensures that the sealing surface receives targeted deep cleaning before each closure, effectively solving the industry pain point of high-viscosity wet sand being easy to adhere to and difficult to remove. It should be understood that although this embodiment preferably triggers cleaning at the bottom station, in other embodiments, the cleaning station can also be set on the side or top according to the equipment layout, as long as the location is convenient for cleaning operations and does not affect the main unloading channel.

[0044] like Figure 8 As shown, to achieve the above functions, the reciprocating brush assembly 620 specifically includes two cleaning brushes 621, with a connecting plate A622 shared between them. A connecting plate B623 is located on the outer side of the connecting plate A622. A slider A624 is located at the bottom of each cleaning brush 621, slidingly mounted inside a slide rail B625, which is fixedly mounted on the top of the connecting frame 626. This symmetrical arrangement of the two cleaning brushes, combined with the precise guidance of the slide rail B512, ensures a uniform distribution of brushing force on both sides of the sealing surface 410, avoiding uneven wear caused by unilateral force. It also ensures that the cleaning brushes 621 maintain a stable posture during reciprocating motion, improving the coverage and cleanliness of the brushing. The connecting frame 626 serves as the mounting base for the entire reciprocating brush assembly, and its position is dynamically adjusted by the lifting assembly.

[0045] refer to Figure 6 and Figure 7The lifting assembly 610 includes a drive motor 611, a drive shaft 612, a crankshaft 613, a connecting rod 614, and a slide column 615. The output end of the drive motor 611 is linked to the drive shaft 612. The drive shaft 612 is fixedly connected to one end of the crankshaft 613, while the other side of the crankshaft 613 is rotatably connected to one end of the connecting rod 614. The other end of the connecting rod 614 is rotatably connected to the slide column 615, which is located at the bottom of the connecting plate B623. The drive motor 611 is configured to drive the connecting rod 614 via the drive shaft 612 and crankshaft 613, converting rotational motion into linear reciprocating motion between the connecting plate B623 and the connecting plate A622. In this force transmission path, the crankshaft 613, connecting rod 614, and slide column 615 constitute a typical crank-slider mechanism, which can efficiently convert the continuous rotation of the drive motor 611 into linear reciprocating motion of the cleaning brush 621. Compared to directly using linear motors or cylinders, this mechanical transmission method has significant advantages such as compact structure, strong anti-pollution ability, and low maintenance cost, making it particularly suitable for the harsh environment of high dust and humidity inside sand mixers. Simultaneously, the dead-point characteristic of the crank-slider mechanism provides a certain self-locking buffering effect at extreme positions, helping to reduce impact vibration during reversal. It should be understood that although this embodiment preferably uses a crank-slider mechanism to achieve motion conversion, in other embodiments, linear drive devices such as gear racks, lead screw and nut pairs, hydraulic cylinders, or pneumatic slides can be used instead, as long as the linear reciprocating motion function of the cleaning brush relative to the sealing surface can be achieved. Furthermore, the installation position of the drive motor 611 is not limited to the top of the connecting plate shown in the figure; it can also be flexibly adjusted to the side or bottom according to the spatial layout and connected to the crankshaft via intermediate transmission components such as belts or chains. These variations are all within the scope of protection of this invention.

[0046] This embodiment further optimizes the sealing structure and auxiliary cleaning mechanism of the sliding door to improve its sand-trapping performance from a physical perspective. Specifically, the sealing surface 410 of the sliding door 400 has a stepped structure, and the corresponding position of the discharge port has a stepped groove or a flat structure; in the closed state, the stepped structure directly fits and seals with the bottom plane of the discharge port, replacing the rigid insertion fit of the protrusion and groove. Figure 5 , Figure 6As shown, in this embodiment, the movable door 400 is specifically implemented as a feeding frame, with steps on both sides of its door panel; the rotating carrier is specifically implemented as a roller, with an opening at its top, and the movable door 400 is slidably disposed inside the opening, with step grooves on both sides of the opening corresponding to the steps. This stepped planar fitting and sealing design is fundamentally different from the common concave-convex insertion sealing in the prior art. In the traditional concave-convex structure, the bottom of the groove is very likely to become a dead corner for the accumulation of molding sand, especially when processing high-viscosity wet sand. Once the sand particles are embedded deep in the groove, they are not only difficult to be discharged by gravity or simple vibration, but will also be squeezed and hardened during the repeated opening and closing of the baffle plate, eventually leading to the sealing surface not being able to close completely or even rigid cracking. The step-to-step fit adopted in this invention transforms the sealing contact surface into an open planar fitting form, completely eliminating the closed cavity space for accommodating sand particles. When the unloading door is closed, the bottom surface of the step and the top surface of the step groove are directly pressed together along the normal direction. Even if a small amount of loose sand is attached to the surface, it will be scraped off by the edge of the step or squeezed out to the surroundings at the moment of fitting, and will not be pressed into the fitting gap. This design not only avoids relative shear friction between the sealing surfaces but also significantly reduces the risk of leakage caused by foreign objects, providing a reliable physical sealing basis for the intelligent rotary unloading gate. It should be understood that although the steps and step grooves are preferably rectangular in cross-section in this embodiment, trapezoidal, arc-shaped, or multi-level stepped structures that can form open planar fits can also be used in other embodiments, as long as normal sealing is achieved and there is no enclosed sand-containing cavity.

[0047] To further enhance the cleaning effect and prevent the cleaning mechanism from malfunctioning due to sand adhesion, side plates are provided on both sides of the housing 200. Several air holes 210 are provided on the inner side of the side plates corresponding to the cleaning mechanism. These air holes 210 are configured to connect to an external high-pressure air source to blow away residual molding sand from the cleaning mechanism. Combined with... Figure 7 and Figure 9It is evident that the air outlet 210 is strategically positioned so that its airflow direction is directly facing the working area of ​​the cleaning brush 521. After the mechanical reciprocating brushing motion is completed or during it, a high-pressure airflow is ejected at high speed through the air outlet 210, powerfully cleaning the gaps between the bristles of the cleaning brush 521 and the surface of the door panel steps. This pneumatic-assisted cleaning mechanism effectively supplements purely mechanical brushing, playing an irreplaceable role, especially in the case of molding sand with high moisture content and high viscosity. In actual production, wet sand easily adheres to the base of the bristles, forming clumps that are often difficult to remove completely by mechanical friction alone. Over time, this can cause the cleaning brush to lose its cleaning ability or even become a new source of pollution. The intervention of high-pressure airflow utilizes fluid shear force to penetrate deep into the bristle gaps, forcibly peeling off and blowing away fine dust and sticky wet sand clumps that are difficult to reach by mechanical force, ensuring that the cleaning mechanism is always in a clean and efficient working state. Furthermore, the air vent 123 can also be configured as an adjustable-angle nozzle or a slit-type air knife to adapt to the cleaning needs of molding sand with different viscosities; the external air source is not limited to compressed air, but can also be inert gases such as nitrogen to prevent oxidation or moisture absorption of specific molding sand. Through the synergistic effect of the triple mechanism of "step plane sealing + mechanical reciprocating brushing + high-pressure pneumatic blowing", this embodiment constructs a three-dimensional anti-sand jamming protection system, significantly improving the long-term operational reliability of the equipment under harsh working conditions.

[0048] Furthermore, this embodiment provides a control method for an intelligent rotary discharge gate used in a planetary rotor sand mixer. This method is applied to the intelligent rotary discharge gate described in the aforementioned embodiment and aims to endow the hardware device with the ability to autonomously perceive faults and self-repair through software logic, which is the core manifestation of realizing equipment intelligence. This control method does not rely on specific mechanical structure improvements, but rather constructs a complete closed-loop self-healing logic based on sensor feedback.

[0049] Specifically, the control method includes the following steps: In step S100, during the closing process of the movable door 400, the transmission torque of the drive mechanism 600 is monitored in real time by the torque sensor 700. This step is the sensing foundation of the entire intelligent protection mechanism. During the closing phase, the sealing surface 410 of the movable door 400 gradually approaches and finally fits against the discharge port. At this time, the magnitude of the transmission torque directly reflects the contact state between the sealing surfaces 410. If the sealing surface 410 is clean and free of foreign objects, the torque should show a steady upward trend and stabilize after reaching the preset sealing pressure. Conversely, if there are hard sand blocks or other foreign objects between the sealing surface 410 and the discharge port 110, the load resistance on the transmission chain will surge instantly, manifesting as abnormal fluctuations in the torque signal. By collecting this physical quantity in real time, the system can convert the invisible internal sand inclusion state into a quantifiable electrical signal, providing data support for subsequent decision-making.

[0050] In step S200, in response to an abnormal increase in transmission torque, it is determined that sand is trapped between the sealing surface and the discharge port. The drive mechanism is then controlled to pause closing and reopen the intelligent rotary discharge gate. This is the triggering and execution stage of the self-healing process. When the system detects abnormal torque, it does not simply alarm and stop the machine to wait for manual intervention, but actively takes corrective measures. First, the current closing action is immediately paused to prevent hard sand from embedding into the sealing surface 410 under continuous extrusion pressure, causing permanent damage or motor overload and burnout. Then, the drive mechanism 600 is controlled to move in the reverse direction, causing the movable gate 400 to return to the open or half-open state. This "reopening" action is crucial. It releases the stress of the compressed molding sand, widens the gap between the sealing surface 410 and the discharge port 110, and creates the necessary physical space for subsequent cleaning operations, allowing the originally compressed foreign objects to loosen or be exposed, thereby significantly improving the success rate of secondary cleaning.

[0051] In step S300, after the intelligent rotary unloading door reopens, the cleaning mechanism 600 is triggered to perform a secondary cleaning action on the sealing surface. This step is a targeted repair for the fault point. After confirming that the door has safely retreated to provide sufficient operating space, the system automatically calls the cleaning mechanism 600 to perform a thorough cleaning of the sealing surface 410. Unlike routine cleaning after regular unloading, this cleaning is an emergency procedure triggered after a clear fault signal is detected. Its execution is more forceful and targeted, aiming to thoroughly remove the root cause of the closure failure and eliminate potential hazards during reclosure.

[0052] In step S400, after the secondary cleaning is completed, the drive mechanism 500 is controlled again to perform the closing action until the angle sensor 800 reports that the rotating carrier has returned to its correct position and the torque sensor 700 reports that the closing torque is within the normal range, thus completing the intelligent sealing closure. This is the termination condition verification of the closed-loop control. The system does not blindly assume that the fault has been eliminated after a single cleaning, but ensures the effectiveness of the repair through a "retry-verification" mechanism. Only when the angle sensor 800 confirms that the rotating carrier has accurately returned to the predetermined sealing position, and the closing curve reported by the torque sensor 700 conforms to the normal sealing characteristics, is the self-healing considered successful and the cycle ends. This dual verification mechanism effectively prevents repeated invalid closures caused by incomplete cleaning, and also avoids false closures caused by sensor drift or erroneous signals, ensuring the long-term operational reliability of the equipment under unattended conditions. It should be understood that although this embodiment describes the single retry logic, in other embodiments, a maximum retry counter can be set, and after multiple consecutive self-healing failures, the system can switch to manual maintenance mode to prevent the equipment from falling into a dead loop.

[0053] Furthermore, to improve the accuracy and robustness of sand inclusion detection, the specific logic for determining the presence of sand inclusion between the sealing surface 410 and the discharge port 110 in step S200 includes: comparing the real-time monitored transmission torque with a preset torque threshold; when the transmission torque is greater than the preset torque threshold, or the rate of change of the transmission torque exceeds a preset rate of change threshold, sand inclusion is determined to exist. This employs a dual-criteria strategy combining absolute value and rate of change. The preset torque threshold is primarily used to identify known, stable high-resistance states, such as large pieces of hard sand or metal foreign objects stuck; while the preset rate of change threshold is used to capture transient, sudden surges in resistance, such as impact loads caused by localized caking of molding sand or sudden changes in viscosity. Single-threshold judgment is easily affected by environmental noise or batch differences in molding sand, leading to false alarms or missed alarms. The dual-criteria approach can take into account both steady-state and transient anomalies, significantly improving the sensitivity and specificity of fault identification. For example, under certain high humidity conditions, the normal closing torque is inherently high. Relying solely on the absolute threshold may lead to frequent false triggering. However, by introducing the rate of change criterion, as long as the torque rise slope is within the normal range, even if the peak value is slightly higher, it can be regarded as a normal compaction process, thereby avoiding unnecessary shutdowns for cleaning.

[0054] Accordingly, the specific execution strategy for triggering the cleaning mechanism 600 to perform a secondary cleaning action on the sealing surface 410 in step S300 includes: controlling the lifting component 610 to drive the reciprocating brush component 620 to rise to a working position close to the sealing surface 410, and controlling the reciprocating brush component to perform at least one complete linear reciprocating brushing cycle. This detailed specification ensures the integrity and effectiveness of the secondary cleaning action. After receiving the cleaning command, the lifting component 610 must first accurately send the brush head to the working height to avoid brushing failure due to positional deviation; then the reciprocating brush component 620 must complete at least one full-stroke reciprocating motion to ensure that foreign objects within the entire length range of the sealing surface can be covered and removed. Compared with intermittent inching cleaning, complete periodic brushing can provide more uniform cleaning force, especially for wet sand clumps with strong adhesion, the cumulative shearing effect generated by multiple reciprocating frictions is more conducive to peeling them off. It should be understood that although this embodiment preferably executes a complete cycle, in practical applications, the number of brushing cycles or frequency can also be dynamically adjusted according to the severity of the torque anomaly. For example, when an extremely high torque peak is detected, the number of brushing cycles can be automatically increased to achieve a graded response and further optimize the balance between energy efficiency and cleaning effect.

[0055] Finally, this embodiment provides a planetary rotor sand mixer that integrates the intelligent rotary discharge gate described in any of the foregoing embodiments, aiming to solve the technical problems of traditional sand mixers such as easy sand jamming, seal failure, and frequent maintenance under harsh working conditions. Specifically, the planetary rotor sand mixer includes a sand mixing cylinder 100, with at least one discharge port 110 at the bottom; the intelligent rotary discharge gate is located at the bottom of the sand mixing cylinder 100, and its sealing surface is used to seal the discharge port 110. Figure 1 , Figure 2 As shown in this embodiment, the bottom of the mixing cylinder 100 is typically connected to a base, and the discharge port 110 is located on the base. The housing 200 of the intelligent rotary unloading gate is fixedly installed on the lower surface of the base by bolts or welding, so that the rotating carrier and movable door inside the housing 200 can be precisely aligned with the discharge port 110. It should be understood that although the figure shows a structure with two discharge ports arranged in parallel, in other embodiments, depending on the capacity and production efficiency requirements of the sand mixer, the number of discharge ports 110 can be one, three or more, and the corresponding intelligent rotary unloading gate can also be configured with a single station or multiple stations in parallel, as long as the discharge throughput requirements of the whole machine can be met. In addition, the connection method between the housing 200 and the base is not limited to the flange bolt connection shown in the figure. It can also adopt a quick-release clamp structure, a hydraulic locking mechanism or integral casting, etc., to adapt to different on-site installation conditions and maintenance convenience requirements.

[0056] In the actual operation of the planetary rotor sand mixer, the rotor inside the mixing cylinder 100 rotates at high speed around its own axis and revolves around the center of the cylinder, applying strong crushing, shearing, and mixing effects to the molding sand. This special planetary motion mode causes the discharge gate at the bottom to bear extremely high dynamic loads, severe vibrations, and continuous squeezing and scouring by the molding sand. It is under these extreme working conditions that the triple protection mechanism constructed in the aforementioned embodiments of the present invention demonstrates irreplaceable technical value. First, regarding the problem of gate loosening and wear that may be caused by high-intensity vibration, the worm gear self-locking transmission chain and tension spring constant force pre-tightening mechanism described in Embodiment 2 play a key role, ensuring that the discharge gate can remain stably suspended in any position and can maintain sufficient sealing pressure under long-term vibration environment, preventing leakage accidents caused by loose fasteners. Secondly, addressing the characteristics of high viscosity, high hardness, and easy embedding of molding sand after planetary rotor compaction, the frictionless opening and closing sequence of "radial contraction to detach from the sealing surface, followed by circumferential rotation to open the discharge port" completely eliminates the drawbacks of traditional tilting doors that forcibly scrape the sealing surface under pressure, fundamentally preventing permanent damage caused by hard sand particles being squeezed into the mating gaps. Thirdly, addressing the industry-wide problem of wet sand easily adhering and clumping, leading to incomplete closure, the "mechanical reciprocating brushing + high-pressure pneumatic blowing" composite cleaning mechanism, combined with the stepped plane-fitting sealing structure, forms an active anti-sand-jamming barrier, ensuring that the sealing surface remains clean and flat even during continuous production of high-viscosity resin sand or water glass sand.

[0057] To more clearly illustrate the technical effects of this invention in the overall machine application, a typical sand mixing cycle is used as an example below. During the sand mixing stage, the intelligent rotary discharge gate is closed. The movable gate 400, under the combined action of the tension spring 430's pre-tension force and the self-locking force of the worm gear 511 and worm 512, tightly fits against the discharge port 110, effectively resisting the weight pressure of several tons of molding sand above and the strong impact of the rotor, ensuring zero leakage during the sand mixing process. When the sand mixing ends and the discharge stage begins, the control system first drives the movable gate 400 to retract radially, causing the sealing surface 410 to separate normally from the discharge port 110, forming a safe gap. Then, it drives the rotating carrier 300 to rotate 90 degrees to the discharge position. The entire process is free of any metallic friction noise or jamming, and the discharge is smooth and rapid. When the rotating carrier 300 continues to rotate to the bottom cleaning position, the cleaning mechanism 300 automatically rises and performs high-frequency reciprocating brushing and high-pressure air blowing on the sealing surface 410, thoroughly removing residual wet sand. During the re-closing phase, if the torque sensor 700 detects abnormal resistance, the system will automatically trigger the intelligent re-cleaning logic, pausing the closure, restarting, and performing a secondary enhanced cleaning until it is confirmed that the sealing surface 410 is free of foreign objects and the closing torque is normal before completing the sealing. This complete closed-loop work cycle not only significantly improves the automation level and operational reliability of the equipment, but also significantly reduces the frequency of manual cleaning and the cost of spare parts replacement.

[0058] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the linkage guidance form of the drive mechanism, the reciprocating motion conversion method of the cleaning mechanism, the stepped fit structure of the sealing surface, and the specific parameter settings of the intelligent re-cleaning logic in the foregoing embodiments are all preferred examples listed to clearly illustrate the technical solution of the present invention, and are not exhaustive limitations on the present invention. Any equivalent changes, substitutions, or improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the concept of the present invention, such as using other mechanical timing mechanisms to achieve a contraction-rotation action, using different forms of elastic elements to replace the tension spring, or using a hydraulic-pneumatic method to achieve the reciprocating motion of the cleaning brush, should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An intelligent rotary discharge gate for a planetary rotor sand mixer, characterized in that, include: The rotating carrier (300) is rotatably disposed inside the box (200) at the bottom of the mixing cylinder (100); The movable door (400) is slidably nested within the rotating carrier (300), and the movable door (400) has a sealing surface (410) for sealing the discharge port (110); The drive mechanism (500) is located on the outside of the housing (200) and is configured to perform the following actions in sequence: drive the movable door (400) to retract radially so that the sealing surface (410) disengages from the discharge port (110), and drive the rotating carrier (300) to rotate circumferentially to open the discharge port (110). A cleaning mechanism (600) is located at the bottom of the rotating carrier (300) and is configured to actively brush the sealing surface (410) when the movable door (400) rotates to the preset cleaning position. The cleaning mechanism (600) includes a lifting assembly (610) and a reciprocating brush assembly (620). A torque sensor (700) and an angle sensor (800) are respectively configured to monitor the transmission torque of the drive mechanism (500) and the rotation angle of the rotating carrier (300) to provide a closed state feedback signal; The drive mechanism (500) includes a rotary drive component (510) and a linkage guide component (520); The linkage guide (520) is located on both sides of the rotating carrier (300) and is rotatably configured with respect to the rotating carrier (300); The linkage guide component (520) is provided with an arc-shaped guide groove (521), and the movable door (400) is provided with a guide pin (420) that slides with the arc-shaped guide groove (521). A tension spring (430) is provided at the bottom of the movable door (400), and the other end of the tension spring (430) is fixed to the inside of the rotating carrier; When the rotary drive (510) rotates, the contour change of the arc-shaped guide groove (521) first drives the movable door (400) to retract radially, and after the movable door (400) retracts to the preset position, it drives the rotating carrier (300) to rotate circumferentially.

2. The intelligent rotary discharge gate for a planetary rotor sand mixer according to claim 1, characterized in that, The rotary drive (510) includes a worm gear (511), a worm (512), a gear (513), and a toothed plate (514). The worm gear (511) is located on the outside of the housing (200) and is connected to the center of the outside of the linkage guide (520) via a drive shaft; The worm (512) meshes with the worm wheel (511), the gear (513) is located at the end of the worm (512) away from the worm wheel (511), and the toothed plate (514) meshes with the gear (513) and is driven to move up and down by external force.

3. The intelligent rotary discharge gate for a planetary rotor sand mixer according to claim 1, characterized in that, When the rotating carrier (300) rotates to the preset cleaning station, the lifting component (610) is configured to drive the reciprocating brushing component (620) to approach the sealing surface (410), and the reciprocating brushing component (620) is configured to perform linear reciprocating brushing on the sealing surface (410).

4. The intelligent rotary discharge gate for a planetary rotor sand mixer according to claim 3, characterized in that, The reciprocating brush assembly (620) includes two cleaning brushes (621), a connecting plate A (622) is provided between the two cleaning brushes (621), and a connecting plate B (623) is provided on the outside of the connecting plate A (622). The bottom of the cleaning brush (621) is provided with a slide bar A (624), the slide bar A (624) is slidably disposed inside the slide rail B (625), and the slide rail B (625) is disposed on the top of the connecting frame (626); The lifting assembly (610) includes a drive motor (611), a drive shaft (612), a crankshaft (613), a connecting rod (614), and a slide column (615). The output end of the drive motor (611) is linked with the drive shaft (612). The drive shaft (612) is fixedly connected to one end of the crankshaft (613). The other side of the crankshaft (613) is rotatably connected to one end of the connecting rod (614). The other end of the connecting rod (614) is rotatably connected to the slide column (615). The slide column (615) is located at the bottom of the connecting plate B (623). The drive motor (611) is configured to drive the connecting rod (614) to move via the drive shaft (612) and crankshaft (613) so as to convert the rotational motion into the linear reciprocating motion of the connecting plate B (623) and the connecting plate A (622).

5. The intelligent rotary discharge gate for a planetary rotor sand mixer according to claim 1, characterized in that, The sealing surface (410) of the movable door (400) is provided with a stepped structure, and the discharge port (110) is provided with a stepped groove or a planar structure at the corresponding position; In the closed state, the stepped structure is directly and sealed to the bottom plane of the discharge port, replacing the rigid insertion fit between the protrusion and the groove.

6. The intelligent rotary discharge gate for a planetary rotor sand mixer according to claim 5, characterized in that, The top of the rotating carrier (300) has an opening, the movable door (400) is slidably disposed inside the opening, and the two sides of the opening are provided with step grooves corresponding to the step structure. Both sides of the housing (200) are provided with side plates, and the inner side of the side plates is provided with a number of air blowing holes (210) corresponding to the cleaning mechanism (600). The air blowing holes (210) are configured to be connected to an external high-pressure air source to blow away the residual molding sand on the cleaning mechanism (600).

7. A control method for an intelligent rotary discharge gate used in a planetary rotor sand mixer, applied to the intelligent rotary discharge gate as described in any one of claims 1 to 6, characterized in that, include: During the closing process of the movable door (400), the transmission torque of the drive mechanism is monitored in real time by the torque sensor (700); In response to an abnormal increase in the transmission torque, it is determined that there is sand trapped between the sealing surface (410) and the discharge port (110), and the drive mechanism (500) is controlled to pause closing and reopen the intelligent rotary unloading door; After the intelligent rotary unloading door is reopened, the cleaning mechanism (600) is triggered to perform a secondary cleaning action on the sealing surface (410); After the secondary cleaning is completed, the drive mechanism (500) is controlled again to perform the closing action until the angle sensor (800) reports that the rotating carrier (300) has returned to the correct position and the torque sensor (700) reports that the closing torque is within the normal range, thus completing the intelligent sealing closure.

8. The control method according to claim 7, characterized in that, The determination that there is sand inclusion between the sealing surface (410) and the discharge port (110) includes: The real-time monitored transmission torque is compared with a preset torque threshold. When the transmission torque is greater than the preset torque threshold, or the rate of change of the transmission torque exceeds a preset rate of change threshold, it is determined that sand inclusion exists. Triggering the cleaning mechanism (600) to perform a secondary cleaning action on the sealing surface (410) includes: The lifting assembly (610) is controlled to drive the reciprocating brush assembly (620) to rise to a working position close to the sealing surface (410), and the reciprocating brush assembly (620) is controlled to perform at least one complete linear reciprocating brush cycle.

9. A planetary rotor sand mixer, characterized in that, include: A sand mixing cylinder (100) has at least one discharge port (110) at its bottom. The intelligent rotary unloading gate as described in any one of claims 1 to 6 is disposed at the bottom of the sand mixing cylinder (100), and the sealing surface (410) of the movable door (400) is used to seal the discharge port (110).

Images