Magnetic separation iron removal device for recycling foundry waste sand

Abstract

The invention belongs to the technical field of casting, in particular to a magnetic separation iron removal device for casting waste sand recovery, and provides the following scheme that the magnetic separation iron removal device comprises a conveying belt installed on a rack, the conveying belt is supported and rotated through a driving roller and a magnetic roller, and a vibration frame making contact with the inner wall of the top of the conveying belt is installed on the rack; a collision block connected with the air cylinder is arranged below the vibration frame, a split plate rotationally connected through a torsional spring is arranged on the outer side of the magnetic roller, and the split plate inclines upwards towards the position close to the axis of the magnetic roller in the normal state. According to the invention, through impact dispersion and separation through the separation plate, the abnormal working condition caused by material agglomeration can be accurately identified by comprehensively monitoring the impact mechanical signal of the material at the position of the separation plate and the position signal of the operation of the separation plate, so that the continuous operation efficiency of a production line and the pertinence of manual maintenance are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of casting technology, and in particular to a magnetic separation and iron removal device for recycling casting waste sand. Background Technology

[0002] In the casting production process, a large amount of molding sand (such as quartz sand, chromite sand, etc.) will form "old sand" or "waste sand" containing many impurities after being poured with high-temperature molten metal. The magnetic impurities mixed in these waste sands are usually separated and recycled.

[0003] Chinese patent CN223465520U discloses a waste sand recycling device for iron mold sand casting process, including a conveyor belt, an installation plate fixedly connected to the outer wall of the conveyor belt, a first gear fixedly connected to the top of the installation plate, a motor fixedly installed at the bottom of the installation plate, and an installation base fixedly connected to the output end of the motor through the installation plate. A lead screw is rotatably connected to the installation base, and a second gear is fixedly connected to the bottom of the lead screw at the position corresponding to the first gear. The installation base has a sliding groove and symmetrically arranged slots. A lifting plate is slidably connected inside the sliding groove, and a locking block is fixedly connected to the lifting plate at the positions corresponding to the two slots.

[0004] In existing technologies, waste sand is generally simply fed onto a conveyor belt, and magnetic impurities are separated and recovered through magnetic suction components or magnetic rollers. However, magnetic impurities often accumulate or agglomerate with other non-magnetic impurities, which affects the separation effect of magnetic impurities. Summary of the Invention

[0005] Based on the technical problems in the background art, the present invention proposes a magnetic separation iron removal device for the recycling of foundry waste sand.

[0006] This invention proposes a magnetic separation and iron removal device for recovering foundry waste sand, comprising a conveyor belt mounted on a frame, the conveyor belt being supported and rotated by a drive roller and a magnetic drum, a vibrating frame mounted on the frame that contacts the inner top wall of the conveyor belt, a striking block connected to a cylinder being disposed below the vibrating frame, a dividing plate being disposed on the outer side of the magnetic drum and rotatably connected by a torsion spring, the dividing plate being tilted upwards towards the axis of the magnetic drum under normal conditions; the top surface of the dividing plate being configured as a contact panel connected to a pressure sensor; an angle sensor being disposed to monitor the tilt angle of the dividing plate compared to the normal state; a control unit acquiring signals monitored in real time by the pressure sensor and the angle sensor, performing weighted normalization processing on the change in pressure signal and the offset of angle signal to obtain a judgment index, comparing the judgment index with a preset threshold, and outputting a corresponding warning signal based on the comparison result.

[0007] Preferably, connecting blocks are fixed at both ends of the bottom of the dividing plate, a fixed seat is fixed on the frame, a fixed shaft is provided at the end of the fixed seat, the connecting block and the outer wall of the fixed shaft are rotatably connected by a torsion spring, and a gap is left between the edge of the dividing plate facing the magnetic roller and the conveyor belt.

[0008] Preferably, a fixed frame is installed in the middle area of ​​the conveyor belt, with an upper demagnetizer installed at the top end of the fixed frame facing the drive roller, and a lower demagnetizer installed at the bottom end of the fixed frame facing the magnetic roller.

[0009] Preferably, both the vibrating frame and the cylinder are mounted on a fixed frame. The top of the vibrating frame is made of a planar structure of elastic material, and the top of the vibrating frame slides in contact with the inner top wall of the conveyor belt. The vibrating frame is positioned between the upper demagnetizer and the lower demagnetizer, with the vibrating frame located near the upper demagnetizer.

[0010] Preferably, an auxiliary dispersion component is provided on the fixed frame on the side of the vibrating frame near the magnetic drum. The auxiliary dispersion component is provided with multiple mounting cylinders. An upper abutment rod is movably provided at the top of the mounting cylinder, and a lower abutment rod is movably provided at the bottom of the mounting cylinder. The ends of the upper and lower abutment rods away from the mounting cylinders are in contact with the inner wall of the conveyor belt.

[0011] Preferably, the mounting cylinder is provided with an upper cylinder, a middle ring and a lower cylinder from top to bottom. The inner diameter of the middle ring is smaller than the inner diameter of the upper cylinder and the lower cylinder. An upper spring is connected between the bottom end of the upper abutment rod and the top of the middle ring.

[0012] Preferably, a force sensor and a displacement sensor are installed inside the upper cylinder. The force sensor is used to monitor the compressive force on the upper spring, and the displacement sensor is used to monitor the compression deformation of the upper spring. The control unit synchronously acquires the actual compressive force signal monitored by the force sensor and the compression deformation signal monitored by the displacement sensor. Based on the mechanical characteristic model of the spring, the theoretical compressive force is calculated according to the compression deformation. The evaluation index is calculated using the relative deviation between the actual compressive force and the theoretical compressive force.

[0013] Preferably, the control unit also acquires judgment index information and evaluation index information simultaneously, performs weighted fusion calculation on the evaluation index information of the preprocessing stage and the judgment index information of the final separation stage, generates a system-level operation evaluation index, and evaluates the magnetic separation effect during operation based on the different numerical ranges of the operation evaluation index.

[0014] Preferably, an extension rod is fixed to the bottom end of the upper abutment rod, and a slider is fixed to the bottom end of the extension rod. The slider slides in contact with the inner wall of the lower cylinder, and a lower spring is connected between the bottom of the slider and the top of the lower abutment rod.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. In this invention, materials are dispersed by impact and separated by a partition plate. By comprehensively monitoring the mechanical signals of the impact of materials at the partition plate position and the position signals of the partition plate operation, abnormal working conditions caused by material agglomeration can be accurately identified, thereby significantly improving the continuous operation efficiency of the production line and the targeted nature of manual maintenance.

[0017] 2. In this invention, moving the material to the auxiliary dispersion component will press down the upper abutment rod at the corresponding position. If there is agglomerated material, the downward pressing distance of the upper abutment rod at the center position will be greater than the downward descent distance of the upper abutment rod at the adjacent position. Due to the intersection of the surrounding upper abutment rods, the agglomerated material will be dispersed, thereby improving the dispersion and separation effect of the material before magnetic separation, and enabling quantitative evaluation and direct feedback of the vibration dispersion pretreatment effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a magnetic separation and iron removal device for recycling foundry waste sand proposed in this invention.

[0019] Figure 2 This is a schematic diagram of the distribution structure of the drive roller, magnetic drum, and support roller of a magnetic separation and iron removal device for recycling foundry waste sand proposed in this invention.

[0020] Figure 3 This is a schematic diagram of the magnetic drum position structure of a magnetic separation and iron removal device for recycling foundry waste sand proposed in this invention;

[0021] Figure 4 This is a schematic diagram of the plate structure of a magnetic separation and iron removal device for recycling foundry waste sand proposed in this invention.

[0022] Figure 5 This is a schematic diagram of the fixed frame structure of a magnetic separation and iron removal device for recycling foundry waste sand proposed in this invention;

[0023] Figure 6 This is a schematic diagram of the mounting cylinder structure of a magnetic separation and iron removal device for recycling foundry waste sand proposed in this invention;

[0024] Figure 7 This is a schematic diagram of the internal structure of the mounting cylinder of a magnetic separation and iron removal device for recycling foundry waste sand proposed in this invention.

[0025] In the diagram: 1. Frame, 2. Conveyor belt, 3. Mounting frame, 4. Drive motor, 5. Drive roller, 6. Magnetic roller, 7. Support roller, 8. Dividing plate, 801. Connecting block, 9. Fixing frame, 10. Upper demagnetizer, 11. Lower demagnetizer, 12. Fixing seat, 121. Fixing shaft, 13. Vibration frame, 14. Cylinder, 15. Impact block, 16. Mounting cylinder, 161. Upper cylinder, 162. Middle ring, 163. Lower cylinder, 17. Upper stop rod, 18. Lower stop rod, 19. Upper spring, 20. Extension rod, 21. Slider, 22. Lower spring. Detailed Implementation

[0026] Example 1: Refer to Figures 1-7 A magnetic separation and iron removal device for recovering foundry waste sand includes a conveyor belt 2 mounted on a frame 1. The conveyor belt 2 is supported and rotated by drive rollers 5 and magnetic drums 6. It should be noted that the frame 1 is used for the installation, placement, and fixation of the entire device. The drive rollers 5 and magnetic drums 6 are rotatably positioned at both ends of the frame 1, so that the conveyor belt 2 wraps around the outer walls of the drive rollers 5 and magnetic drums 6. It should also be noted that a mounting frame 3 is fixed at one end of the frame 1 near the drive rollers 5, and a drive motor 4 is mounted on the mounting frame 3. The output shaft of the drive motor 4 is connected to the end of the drive roller 5. Multiple support rollers 7 are also rotatably mounted on the frame 1, contacting the top inner wall of the annular conveyor belt 2. The multiple support rollers 7 are distributed in the area between the drive rollers 5 and the magnetic drums 6. Furthermore, it should be noted that the magnetic drum 6, also known as a magnetic roller, refers to a device with a fixed magnetic system inside and a drum made of non-magnetic material on the outside. It is both a mechanical drum for transmission or redirection and a magnetic separation component that generates a magnetic field. Therefore, when using... During use, the waste sand to be processed is fed in batches onto the top surface of the conveyor belt 2 from the end near the drive roller 5. The waste sand moves towards the magnetic drum 6 along the top surface of the conveyor belt 2 until it reaches the position of the magnetic drum 6. Non-magnetic materials fall directly, while magnetic materials continue to move under the magnetic attraction and then detach, thereby achieving the effect of magnetic separation and iron removal. A vibrating frame 13 is installed on the frame 1, which contacts the inner wall of the top of the conveyor belt 2. A collision block 15 connected to the cylinder 14 is set below the vibrating frame 13. During use, the collision block 15 is driven by the cylinder 14 to strike the vibrating frame 13, thereby causing the material conveyed on the conveyor belt 2 to vibrate and disperse, so as to disperse the magnetic and non-magnetic materials and avoid the magnetic materials carrying a large amount of non-magnetic materials to agglomerate and affect the magnetic separation effect. A dividing plate 8 is set on the outside of the magnetic drum 6 and is connected by a torsion spring. Under normal conditions, the dividing plate 8 is tilted upward towards the axis position near the magnetic drum 6. The side of the dividing plate 8 facing the magnetic drum 6 is set as the bottom surface, and the side of the dividing plate 8 away from the magnetic drum 6 is set as the top surface.

[0027] The top surface of the dividing plate 8 is configured as a contact panel connected to a pressure sensor. The pressure sensor can be a thin-film pressure sensor or a miniature weighing sensor, used to monitor the normal pressure generated by the material impacting the top surface of the dividing plate in real time, denoted as P.

[0028] An angle sensor is also provided to monitor the tilt angle of the partition plate 8 relative to its normal state. This sensor is used to monitor the deflection angle of the partition plate 8 relative to its initial stationary position, i.e., relative to the torsion spring equilibrium position, denoted as θ. The initial angle is defined as 0°. It should be noted that defining the initial angle as zero does not mean that the initial state of the partition plate 8 is zero degrees relative to the horizontal position. In fact, the initial state of the partition plate 8 is tilted, but it is marked as zero.

[0029] The system operates for a period of time under no-load conditions with no material passing through, and the pressure is collected. and angle As an environmental noise and zero-point reference; during the equipment commissioning phase, typical normally dispersed waste sand was introduced for trial operation, and the microprocessor recorded the typical pressure signal generated when the material passed through under this condition. and angle signal These data characterize the sensor response range under ideal distributed conditions; and a first threshold is preset based on experience and circumstances. Second threshold .

[0030] During magnetic separation operations, the microprocessor calculates an aggregation risk assessment index R in real time. This index is a function that comprehensively considers pressure abrupt changes and angle anomalies, and the calculation formula is as follows: ;

[0031] in This represents the difference between the current pressure and the typical pressure.

[0032] This represents the difference between the current angle and the typical angle;

[0033] and These are weighting coefficients, calibrated experimentally.

[0034] Under normal circumstances, the passage of loose materials has minimal impact on the dividing plate 8. and All values ​​are very small, and the calculated R value is lower than the preset first threshold, so the system is determined to be operating normally.

[0035] When small clumps appear, the impact force increases or causes slight jamming of the separator, the R value rises and exceeds the first threshold. But below the higher second threshold The system can trigger a basic warning, such as a flashing yellow light on the control panel, to alert the operator to pay attention, but there is no need to stop the machine immediately;

[0036] When large or tightly bound clumps appear, generating enormous impact forces or causing significant deflection or even jamming of the separator 8, the R value exceeds the second threshold. The system immediately triggers advanced alarms, such as flashing red lights and audible alarms. It can also pause drive motor 4 or start a stronger vibration program through interlock control, while clearly indicating that manual intervention is required for cleaning or inspection. This solution effectively prevents the risk of decreased magnetic separation efficiency and equipment blockage caused by material agglomeration.

[0037] In this invention, connecting blocks 801 are fixed at both ends of the bottom of the dividing plate 8. A fixing seat 12 is fixed on the frame 1 at a position corresponding to the connecting blocks 801. A fixing shaft 121 is provided at the end of the fixing seat 12. A rotating hole is provided in the connecting block 801. The inner wall of the rotating hole and the outer wall of the fixing shaft 121 are rotatably connected by a torsion spring. A gap is left between the edge of the dividing plate 8 facing the magnetic roller 6 and the conveyor belt 2, thereby realizing the installation of the dividing plate 8 and reserving a gap for the movement of magnetic materials. During the magnetic separation process, when the magnetic and non-magnetic materials are normally dispersed, the non-magnetic materials will separate from the surface of the conveyor belt 2 and fall to the position above the dividing plate 8 when rotating to the top of the dividing plate 8. The magnetic materials are magnetically attracted to the surface of the conveyor belt 2 and move through the gap to the position below the dividing plate 8. When the magnetic and non-magnetic materials agglomerate together, the agglomerated material first First, the material will impact the top surface of the separator 8. The impact force of the agglomerated material is greater than that of the normally loose material impacting the top surface of the separator 8. The impact can help disperse the agglomerated material, thereby assisting in the separation of magnetic and non-magnetic materials. However, if the magnetic and non-magnetic materials cannot be completely dispersed by the impact, the agglomerated material may detach from the conveyor belt 2 and fall onto the separator 8, or the agglomerated material may push the separator 8 through the gaps, carrying the non-magnetic material. Therefore, by comprehensively calculating and analyzing the pressure monitored by the pressure sensor and the deflection of the separator 8 monitored by the angle sensor, it is possible to determine whether there are undispersed agglomerated materials that require manual intervention.

[0038] In this invention, a fixed frame 9 is installed in the middle area of ​​the conveyor belt 2. The fixed frame 9 is fixedly installed between the fixed frame 9 and the frame 1. An upper demagnetizer 10 is installed at the top end of the fixed frame 9 facing the drive roller 5, and a lower demagnetizer 11 is installed at the bottom end of the fixed frame 9 facing the magnetic roller 6. The upper demagnetizer 10 and the lower demagnetizer 11 can be demagnetized by heating, or they can be demagnetized by using an internal electromagnetic coil, passing in an alternating current of a specific frequency, and gradually attenuating the current through a program control. This will generate an alternating magnetic field that penetrates the belt body, thereby demagnetizing the conveyor belt 2. This demagnetization method can replace conventional demagnetizers on the market for demagnetizing the surface of the conveyor belt 2. Thus, before the magnetic separation operation, the upper demagnetizer 10 performs preliminary demagnetization on the surface of the conveyor belt 2 and the materials in contact with it, which facilitates the dispersion and separation effect between magnetic and non-magnetic materials under the action of impact and vibration, thereby facilitating the subsequent magnetic separation operation. After the magnetic separation operation is completed, the lower demagnetizer 11 performs demagnetization to facilitate the detachment of magnetic materials below the conveyor belt 2, and prevent magnetic materials from flowing back with the conveyor belt 2 and affecting the magnetic separation and iron removal operation.

[0039] In this invention, both the vibrating frame 13 and the cylinder 14 are mounted on the fixed frame 9. The top of the vibrating frame 13 is made of a planar structure of elastic material, and the top of the vibrating frame 13 slides in contact with the inner wall of the top of the conveyor belt 2. The cylinder 14 is located below the planar structure of the vibrating frame 13. The cylinder 14, along with the impact block 15, impacts the bottom of the planar structure of the vibrating frame 13. The vibrating frame 13 is located between the upper demagnetizer 10 and the lower demagnetizer 11. The vibrating frame 13 is located close to the upper demagnetizer 10, so that the reciprocating motion of the cylinder 14 causes the impact block 15 to impact the bottom of the planar structure of the vibrating frame 13. The impact vibration, combined with the demagnetization operation just performed, causes the material on the conveyor belt 2 to vibrate and disperse.

[0040] Example 2: Refer to Figures 1-7 A magnetic separation iron removal device for recovering foundry waste sand, based on Embodiment 1, has an auxiliary dispersion component installed on the fixed frame 9 on the side of the vibrating frame 13 near the magnetic drum 6. The auxiliary dispersion component includes multiple mounting cylinders 16, which are vertically installed on the fixed frame 9. An upper abutment rod 17 is movably mounted at the top of each mounting cylinder 16, and a lower abutment rod 18 is movably mounted at the bottom. The ends of the upper and lower abutment rods 17 and 18, away from the mounting cylinders 16, contact the inner wall of the conveyor belt 2. Before being conveyed to the magnetic drum 6 for magnetic separation, the conveyor belt 2 passes through the upper and lower abutment rods 17 and 18 in sequence. The magnetic separator 10, the vibrating frame 13, and the auxiliary dispersing component cause the material to move along the conveyor belt 2 and move vertically, either through vertical movement or under its own gravity. The material moves to the position of the upper abutment rod 17 of the auxiliary dispersing component, which will press down on the corresponding position. If there is agglomerated material, the lowering distance of the upper abutment rod 17 at the center position will be greater than the lowering distance of the upper abutment rod 17 at the adjacent position. Due to the intersection of the surrounding upper abutment rods 17, the agglomerated material will be dispersed, thereby improving the dispersion and separation effect of the material before magnetic separation.

[0041] In this invention, the mounting cylinder 16 is provided with an upper cylinder 161, a middle ring 162 and a lower cylinder 163 arranged sequentially from top to bottom. The inner diameter of the middle ring 162 is smaller than the inner diameter of the upper cylinder 161 and the lower cylinder 163. The outer wall of the upper abutment rod 17 is in sliding contact with the inner wall of the upper cylinder 161. An upper spring 19 is connected between the bottom end of the upper abutment rod 17 and the top of the middle ring 162. Under normal conditions, the upper spring 19 supports the upper abutment rod 17, so that the upper abutment rod 17 is in close contact with the top inner wall of the conveyor belt 2 until the material moves to the corresponding position and presses down on the upper abutment rod 17 or moves vertically and impacts and presses down on the upper abutment rod 17. This achieves the effect of dispersing and separating agglomerates when there are agglomerates by the distributed upper abutment rods 17.

[0042] In this invention, the outer wall of the lower abutment rod 18 slides in contact with the inner wall of the lower cylinder 163, and an extension rod 20 is fixed at the bottom end of the upper abutment rod 17. The extension rod 20 passes through the middle ring 162 and a slider 21 is fixed at the bottom end of the extension rod 20. The slider 21 slides in contact with the inner wall of the lower cylinder 163. A lower spring 22 is connected between the bottom of the slider 21 and the top of the lower abutment rod 18, so that when the material is pressed downward against the upper abutment rod 17, it can push the lower abutment rod 18 to the bottom of the conveyor belt 2 to help remove the magnetic material that has been magnetically separated and attracted by electrostatics below the conveyor belt 2.

[0043] In this invention, a force sensor and a displacement sensor are provided inside the upper cylinder 161: the force sensor is installed on the bottom or top bearing surface of the upper spring 19 to monitor the compressive force on the spring in real time, denoted as F; the displacement sensor can be a miniature laser rangefinder or a magnetostrictive sensor to measure the change in the compression length of the upper spring 19, i.e. the downward displacement of the upper abutment rod 17, denoted as S.

[0044] According to Hooke's Law, within the elastic range, the spring force F is linearly related to the compression S: Where k is the known stiffness coefficient of the upper spring 19; the microprocessor collects (F,S) data pairs in real time, and for the passage of a single sand grain or loose material, the resulting (F,S) data points will be closely distributed along the theoretical line. The S value is relatively small when the material is nearby; when agglomerated material passes through, a larger S value will be generated. At the same time, due to the plastic deformation of the material, internal friction and non-rigid impact, the actual monitored F value will deviate from the ideal linear relationship.

[0045] To quantify the degree of deviation, a dispersion effect evaluation index E is calculated using the following formula: , This refers to the actual compressive force acting on the upper spring 19, measured in real time by the force sensor.

[0046] If an event with a large S value is detected, it indicates that an object has been run over. However, if the calculated E value is low, close to 0, it indicates that the object has good elasticity or rigidity. It is likely a small, broken-up lump or a single hard object. Its mechanical response is close to that of an ideal spring model. The system determines that the dispersion is effective.

[0047] If an event with a large S value is detected, and the E value is also very high, it indicates that there is strong inelastic deformation or continuous compression during the process. This is likely because a wet, sticky, stubborn lump has not been effectively broken up, and the system determines that the dispersion is invalid.

[0048] Additionally, it should be noted that the system can count the number of invalid dispersion events per unit time. When this number exceeds the set limit, an early warning is issued, prompting the operator that the current vibration intensity or dispersion component settings may be insufficient to handle the existing material characteristics, and suggesting adjusting the impact frequency / force of cylinder 14, or checking the material moisture content; thus achieving quantitative evaluation and feedback of the pretreatment process.

[0049] Example 3: Reference Figures 1-7 A magnetic separation and iron removal device for recovering foundry waste sand, based on Example 2, establishes an upper-level controller, such as a PLC or industrial PC, to aggregate evaluation indices from multiple auxiliary dispersion component mounting cylinders 16. And the judgment index R from the intelligent board 8, where A system-level evaluation index Q is calculated, and closed-loop control is performed based on this index.

[0050] Specifically:

[0051] The controller periodically collects data and calculates all auxiliary distributed components within that period. The average of the index And map it to a preprocessed score ,For example, The smaller, The higher the value, the better the preprocessing effect; the calculated R-index of intelligent board 8 within this cycle exceeds... Time percentage , The lower the score, the smoother the final magnetic separation process, which is reflected in the final result score. The higher;

[0052] System-level evaluation index Q calculation: ,in and This is a weighting coefficient, which can be adjusted according to the process emphasis.

[0053] when When this time is reached, it indicates that the system is operating in excellent condition and requires no intervention.

[0054] when When this occurs, it indicates that the system is operating normally and will maintain the current parameters;

[0055] when This indicates that there is room for optimization in the system's operation; the controller can then initiate fine-tuning strategies, such as... Low The acceptable information is fed back to the vibration subsystem, which slightly increases the impact frequency of cylinder 14 for preventative optimization.

[0056] when When this occurs, it indicates that the system performance is substandard, the controller triggers a comprehensive alarm, and clearly indicates the problem tendency on the human-machine interface:

[0057] like Extremely low, indicating insufficient pretreatment. It is recommended to check the vibration unit or the adhesion of materials.

[0058] like extremely low It is acceptable, but the magnetic separation core unit is abnormal. It is recommended to check the magnetic field strength of the magnetic drum 6 or the mechanical structure of the separator 8.

[0059] The system can record operating parameters, such as vibration frequency and intensity, when different material characteristics reach the optimal Q value, forming a process formula library. When processing similar materials again, the corresponding parameters can be automatically called to achieve adaptive optimization. It can not only alarm when there is a fault, but also perform predictive maintenance and parameter self-adjustment when performance deteriorates, significantly improving the intelligence level of the equipment and the stability of the process.

[0060] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A magnetic separation and iron removal device for recovering foundry waste sand, comprising a conveyor belt (2) mounted on a frame (1), the conveyor belt (2) being supported and rotated by a drive roller (5) and a magnetic drum (6), characterized in that, The frame (1) is equipped with a vibrating frame (13) that contacts the inner wall of the top of the conveyor belt (2). Below the vibrating frame (13) is a striking block (15) connected to the cylinder (14). The outer side of the magnetic drum (6) is equipped with a partition plate (8) that is rotatably connected by a torsion spring. Under normal conditions, the partition plate (8) is tilted upward toward the axis position close to the magnetic drum (6). The top surface of the partition (8) is configured as a contact panel for connection with the pressure sensor; An angle sensor is also provided to monitor the tilt angle of the partition (8) compared to its normal state; The control unit acquires signals monitored in real time by pressure and angle sensors, performs weighted normalization on the change in pressure signal and the offset of angle signal to obtain a judgment index, compares the judgment index with a preset threshold, and outputs a corresponding warning signal based on the comparison result.

2. The magnetic separation and iron removal device for recovering foundry waste sand according to claim 1, characterized in that, Both ends of the bottom of the partition plate (8) are fixed with connecting blocks (801), and a fixed seat (12) is fixed on the frame (1). A fixed shaft (121) is provided at the end of the fixed seat (12). The inner wall of the connecting block (801) and the outer wall of the fixed shaft (121) are connected by a torsion spring. There is a gap between the edge of the partition plate (8) facing the magnetic roller (6) and the conveyor belt (2).

3. A magnetic separation and iron removal device for recovering foundry waste sand according to any one of claims 1 to 2, characterized in that, A fixed frame (9) is installed in the middle area of ​​the conveyor belt (2). An upper demagnetizer (10) is installed at the top of the fixed frame (9) facing the drive roller (5), and a lower demagnetizer (11) is installed at the bottom of the fixed frame (9) facing the magnetic roller (6).

4. The magnetic separation and iron removal device for recovering foundry waste sand according to claim 3, characterized in that, The vibrating frame (13) and the cylinder (14) are both mounted on the fixed frame (9). The top of the vibrating frame (13) is made of a planar structure of elastic material, and the top of the vibrating frame (13) slides in contact with the inner wall of the top of the conveyor belt (2). The vibrating frame (13) is located between the upper demagnetizer (10) and the lower demagnetizer (11), and the vibrating frame (13) is located close to the upper demagnetizer (10).

5. The magnetic separation and iron removal device for recovering foundry waste sand according to claim 3, characterized in that, An auxiliary dispersion component is provided on the fixed frame (9) on the side of the vibrating frame (13) near the magnetic roller (6). The auxiliary dispersion component is provided with multiple mounting cylinders (16). An upper abutment rod (17) is movably provided at the top of the mounting cylinder (16), and a lower abutment rod (18) is movably provided at the bottom of the mounting cylinder (16). The ends of the upper abutment rod (17) and the lower abutment rod (18) away from the mounting cylinder (16) are in contact with the inner wall of the conveyor belt (2).

6. The magnetic separation and iron removal device for recovering foundry waste sand according to claim 5, characterized in that, The mounting cylinder (16) is provided with an upper cylinder (161), a middle ring (162) and a lower cylinder (163) from top to bottom. The inner diameter of the middle ring (162) is smaller than the inner diameter of the upper cylinder (161) and the lower cylinder (163). An upper spring (19) is connected between the bottom end of the upper abutment rod (17) and the top of the middle ring (162).

7. The magnetic separation and iron removal device for recovering foundry waste sand according to claim 6, characterized in that, The upper cylinder (161) is equipped with a force sensor and a displacement sensor. The force sensor is used to monitor the compressive force on the upper spring (19), and the displacement sensor is used to monitor the compressive deformation of the upper spring (19). The control unit synchronously acquires the actual compression force signal monitored by the force sensor and the compression deformation signal monitored by the displacement sensor. Based on the mechanical characteristic model of the spring, it calculates the theoretical compression force according to the compression deformation and uses the relative deviation between the actual compression force and the theoretical compression force to calculate the evaluation index.

8. The magnetic separation and iron removal device for recovering foundry waste sand according to claim 7, characterized in that, The control unit also acquires judgment index information and evaluation index information at the same time. It performs weighted fusion calculation on the evaluation index information in the preprocessing stage and the judgment index information in the final separation stage to generate a system-level operation evaluation index. The magnetic separation effect during operation is evaluated according to the different numerical ranges of the operation evaluation index.

9. A magnetic separation and iron removal device for recovering foundry waste sand according to claim 6, characterized in that, An extension rod (20) is fixed to the bottom end of the upper abutment rod (17), and a slider (21) is fixed to the bottom end of the extension rod (20). The slider (21) slides in contact with the inner wall of the lower cylinder (163), and a lower spring (22) is connected between the bottom of the slider (21) and the top of the lower abutment rod (18).

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