Continuous separation system for iron powder in casting solid waste

Abstract

The invention relates to treatment of iron-containing solid waste in the technical field of solid waste treatment, in particular to a continuous separation system for iron powder in casting solid waste. The system comprises a solid waste conveying belt, a smashing and grinding device arranged on the upper portion of one end of the solid waste conveying belt, a split charging device arranged on the lower portion of the other end of the solid waste conveying belt and an iron powder collecting device arranged in the middle of the solid waste conveying belt. The crushing and grinding device is used for inputting crushed solid wastes to the solid waste conveying belt; the split charging device detects the solid waste obtained after iron powder collection, iron-containing solid waste is transferred to the smashing and grinding device to be continuously treated, and iron-free solid waste is collected and subjected to follow-up treatment. According to the method, the recovery rate of iron in solid waste treatment can be increased, meanwhile, the influence of iron on subsequent solid waste treatment is reduced, and finally the beneficial effects of improving economic benefits and environmental friendliness are achieved.

Description

Technical Field

[0001] The invention relates to the treatment of iron-containing solid waste in the technical field of solid waste treatment, and in particular to a continuous separation system for iron powder in foundry solid waste. Background Art

[0002] In the process of solid waste treatment, the treatment of iron-containing solid waste generally adopts the method of separate separation and recovery of iron solid waste, that is, after the solid waste is iron-recovered once, subsequent treatment is carried out. However, in the actual operation process, there may still be iron waste in the solid waste that has been iron-recovered once. For example, iron wrapped in building materials, if these iron-containing solid wastes are transferred to subsequent treatment procedures, it will not only cause waste of iron, but also cause the impact of iron on other solid waste treatment processes in subsequent treatment, which is neither economical nor environmentally friendly. Therefore, it has become an urgent requirement to design a solid waste iron powder recovery system that can continuously process and separate a group of solid wastes until there is no iron in the solid waste. Summary of the invention

[0003] The technical problems to be solved by the present invention are:

[0004] The technical solution to the technical problem to be solved by the present invention is: a continuous separation system of iron powder in casting solid waste, comprising a controller, a solid waste conveyor belt, a crushing and abrasive device arranged on the upper part of one end of the solid waste conveyor belt, a packaging device arranged on the lower part of the other end of the solid waste conveyor belt, and an iron powder collecting device arranged in the middle of the solid waste conveyor belt; the crushing and abrasive device inputs the crushed solid waste onto the solid waste conveyor belt; the iron powder collecting device comprises a driving roller, a driven roller, and a conveyor belt wound around the upper part of the driving roller and the driven roller, a magnetic suction device is arranged between the upper and lower sides of the conveyor belt, and the magnetic field of the magnetic suction device covers the lower part of the conveyor belt; the conveyor belt is perpendicular to the solid waste conveyor belt, and an iron powder collecting device is arranged at the lower part of the conveyor belt; the magnetic field strength of the lower part of the conveyor belt is greater in the direction close to the solid waste conveyor belt than in the direction close to the iron powder collecting device; the packaging device detects the solid waste after iron powder collection, transfers the solid waste containing iron to the crushing and abrasive device, and collects the solid waste without iron for subsequent treatment.

[0005] Preferably, the iron powder collecting device is provided with a plurality of devices for sorting iron powders of different sizes;

[0006] At a conveyor belt position with the same length from the solid waste conveyor belt, the magnetic field strength of the magnetic attraction device of the iron powder collecting device close to the crushing abrasive device is smaller than the magnetic field strength of the magnetic attraction device of the iron powder collecting device far from the crushing abrasive device.

[0007] Preferably, the crushing abrasive device comprises a grinding machine body, and an iron powder enrichment device is arranged on the periphery of the grinding machine body. The iron powder enrichment device is a permanent magnet or an electromagnet, and the iron powder enrichment device rotates around the periphery of the grinding machine body under the drive of a driving mechanism.

[0008] Preferably, the grinding machine body is double-layered, and the inner layer is a mesh structure.

[0009] Better yet, the packing device includes an iron detection sensor and a packing mechanism, and the iron detection sensor, the packing mechanism and the controller are electrically connected. The controller controls the packing mechanism to load the solid waste on the solid waste conveyor belt into different collection devices or introduce it into different material conveyor belts according to the detection results of the iron detection sensor.

[0010] Preferably, the packaging mechanism includes a packaging conveyor belt and a drive motor, and the drive motor is electrically connected to a controller to control the forward and reverse rotation of the drive motor.

[0011] Preferably, the sub-packaging mechanism comprises a sub-packaging balance plate, a fixed support mechanism, and a telescopic support mechanism; the upper end of the fixed support mechanism is hingedly connected to the bottom of one end of the sub-packaging balance plate, a slide groove is arranged at the lower part of the sub-packaging balance plate, and the telescopic end of the telescopic support mechanism is slidably inserted in the slide groove;

[0012] The telescopic support mechanism is an electrically controlled hydraulic rod, an electrically powered telescopic rod or an electrically powered cam.

[0013] Better yet, the normally open contact of the iron detection sensor is electrically connected to the coil winding of the power-off delay relay, the normally open contact of the power-off delay relay is electrically connected to the controller, and the delay time of the power-off delay relay is greater than the time taken for the solid waste conveyor belt to move from the position of the iron detection sensor to the position of the discharge end of the solid waste conveyor belt.

[0014] More preferably, a baffle is arranged at the lower part of the inner mesh structure to form a particle collection area with the outer layer, and a particle outlet hole is arranged at the lower part of the particle collection area;

[0015] It also includes a second solid waste conveyor belt, wherein the second solid waste conveyor belt is equipped with a packaging device and an iron powder collecting device;

[0016] The lower part of the particle outlet hole is the second solid waste conveyor belt, or the particle outlet hole is drained to the second solid waste conveyor belt through a conduit.

[0017] Better yet, set a statistical time ta, accumulate the time tc that the iron detection sensor detects iron materials within the statistical time, calculate the proportion of iron-containing solid waste μ=tc / ta, and when μ is greater than the set threshold, add new solid waste materials to the crushing abrasive device.

[0018] The beneficial effects of the present invention are as follows: by using the continuous separation system of iron powder in foundry solid waste disclosed in the present invention, the system is first crushed, then iron is recovered, the solid waste after iron recovery is tested and packaged, and the solid waste containing iron is transported to the crushing device for crushing and recovery again. The present invention can realize continuous iron recovery of solid waste until the solid waste contains no iron. The above-mentioned recovery method can improve the success rate of iron recovery, reduce the waste of iron materials, improve the economic benefits of solid waste treatment, and at the same time be beneficial to the subsequent treatment of solid waste, reduce the impact of iron on subsequent solid waste treatment, and make solid waste treatment more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the system composition of an embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of an embodiment of the iron powder collecting device of the present invention.

[0021] Figure 3 Schematic diagram of an embodiment of the abrasive crushing device of the present invention.

[0022] Figure 4 It is a schematic diagram of an embodiment of the packaging device of the present invention.

[0023] Figure 5 It is a schematic diagram of another embodiment of the packaging device of the present invention.

[0024] Figure 6 Schematic diagram of a detection circuit according to an embodiment of the present invention.

[0025] In the figure: 100, solid waste conveyor belt; 200, crushing abrasive device; 300, packaging device; 400, iron powder collecting device; 410, driving roller; 420, driven roller; 430, conveyor belt; 440, magnetic device; 210, iron powder enrichment device; 310, iron detection sensor; 320, packaging mechanism; 321, packaging conveyor belt; 322, packaging balance plate; 323, fixed support mechanism; 324, telescopic support mechanism; 110, second solid waste conveyor belt; 441, mounting frame; 442, magnetic block; 130, iron powder conveyor belt; 450, falling magnetic device; 211, magnetic plate; 212, moving ring; 213, fixed ring; 214, driving motor; 221, outer wall; 222, inner wall. DETAILED DESCRIPTION

[0026] In order to make the technical solution and beneficial effects of the present invention clearer, the implementation methods of the present invention are further explained in detail below.

[0027] A system for continuously separating iron powder from foundry solid waste, the system includes a controller for measuring and controlling various mechanisms and devices, as shown in the figure, and also includes a solid waste conveyor belt 100, a crushing and abrasive device 200, a packaging device 300 and an iron powder collecting device 400. Figure 1 As shown, the crushing abrasive device 200 is arranged at the upper part of the left end of the solid waste conveyor belt 100. During operation, the solid waste conveyor belt 100 conveys solid waste from the left end to the right end. The solid waste material is first put into the crushing abrasive device 200 for crushing, and the solid waste after crushing falls onto the solid waste conveyor belt 100 and is conveyed to the right. An iron powder collecting device 400 is arranged in the middle of the solid waste conveyor belt 100, and the iron powder collecting device 400 is used to extract the iron particles in the solid waste on the solid waste conveyor belt 100 to separate the iron waste from the solid waste. After the iron waste is recovered by the iron powder collecting device 400, it cannot be guaranteed that the iron waste is completely recovered. If the iron waste is contained in other solid wastes, it is necessary to inspect and pack the recovered solid waste, crush the solid waste containing iron waste again, and let the solid waste without iron waste be processed later. Therefore, a packaging device 300 is provided at the lower part of the right end of the solid waste conveyor belt 100. After the recycled solid waste is conveyed to the right end, which can be referred to as the discharge end in this article, the solid waste falls on 300, and 300 packages it in different conveyor belts or collection devices according to the detection results. For example, the solid waste containing iron is transferred to the crushing abrasive device 200 for crushing again, and the solid waste without iron is collected for subsequent treatment.

[0028] like Figure 2 As shown, the iron powder collecting device 400 includes a driving roller 410, a driven roller 420, and a conveyor belt 430 wound around the driving roller 410 and the driven roller 420. After the conveyor belt 430 is sleeved, a magnetic attraction device 440 is arranged between the upper and lower surfaces of the conveyor belt 430. Figure 2 As shown, the magnetic suction device 440 includes a mounting frame 441 and a magnetic block 442. The mounting frame 441 is a horizontal fixed rod, and two parallel rods are arranged, and the magnetic block 442 is clamped between the two horizontal fixed rods. The driving roller 410, the driven roller 420 and the mounting frame 441 can be supported on the ground by a bracket, or they can be suspended by hoisting on a supporting point at the upper part of the assembly line, such as the top of a house, a frame at the upper part of the assembly line, etc. After the magnetic block 442 is installed, magnetism is generated at the lower part of the conveyor belt 430, which can generate suction for iron waste and iron powder. An iron powder collection device or an iron powder conveyor belt 130 is provided at the end of the conveyor belt 430 to collect the collected iron powder.

[0029] like Figure 2As shown, in order to generate a magnetic field with a certain length, a group of magnetic blocks 442 are arranged adjacent to each other on the mounting frame 441. In order to achieve the adsorption of iron powder and at the same time be able to drop the adsorbed iron powder into the iron powder collection device or the iron powder conveyor belt 130. The magnetic block 442 on the right side generates a stronger magnetic field intensity at the corresponding position of the lower part of the conveyor belt 430 than the magnetic block 442 on the left side of the two adjacent magnetic blocks 442. The right side here is the side close to the solid waste conveyor belt 100. At this time, after being adsorbed, the iron powder gathers on the conveyor belt 430 and moves to the left. The iron powder gathers on the left side because the magnetic field intensity on the left side is lower. After gathering to a certain extent, the gravity is greater than the suction force and it falls on the iron powder conveyor belt 130.

[0030] The magnetic block 442 can be a permanent magnet or an electromagnet. In order to achieve the above effect, when the magnetic block 442 is a permanent magnet, a permanent magnet with the same magnetic property can be selected. When installing, the magnetic block 442 close to the right is installed at the bottom, and the magnetic block 442 close to the left is installed at the top, so as to generate a gradient difference in magnetic field strength. Alternatively, permanent magnets with different magnetic sizes are selected, and the magnetic blocks 442 are installed at the same height, and the suction force of the permanent magnet on the right is strong. When the magnetic block 442 is an electromagnet, the current passed into the electromagnet on the right can be set to be greater than the current passed into the electromagnet on the left. The electromagnet and the controller are electrically connected to realize the control of the attraction force of the electromagnet.

[0031] Furthermore, in order to more smoothly remove the adsorbed iron powder onto the iron powder conveyor belt 130, a magnetic device 450 is provided at the bottom of the iron powder conveyor belt 130 or the iron powder collecting device. The magnetic device 450 can be a permanent magnet or an electromagnet. When it is a permanent magnet, it is mounted on a cam or a linear motor to produce reciprocating motion, so that it can cyclically approach and move away from the iron powder conveyor belt 130, thereby ensuring that the iron powder adsorbed on the conveyor belt 430 is sucked off, and at the same time, it can ensure that the iron powder sucked off does not accumulate on the iron powder conveyor belt 130. When it is an electromagnet, the current is intermittently supplied to the magnetic device 450 under the control of the controller.

[0032] Better, in order to reduce the scattering of iron powder and iron particles, a collecting plate is provided at the lower part of the conveyor belt 430. As shown in the figure, the collecting plate is inclined and tilted downward toward the iron powder conveyor belt 130. At this time, the falling of large iron particles caused by insufficient adsorption can be introduced into the upper part of the iron powder conveyor belt 200 through the collecting plate.

[0033] Better, such as Figure 1As shown, in order to sort iron particles of different sizes and masses, multiple iron powder collecting devices 400 are provided, and two iron powder collecting devices 400 are provided in the figure. The magnetic field gradients of the magnetic suction devices 440 of the two iron powder collecting devices 400 are different. As shown in the figure, two iron powder collecting devices 400 are provided at the front and rear of the solid waste conveyor belt 100, and the front is on the right. In order to achieve the recycling of particles of different sizes, the right end recycles small particles and the left end recycles large particles. Assume that there are three magnetic blocks 442 in the magnetic suction device 440 at the right end, and the magnetic field strength is a+1, a+2, a+3; the magnetic blocks 442 of the magnetic suction device 440 at the left end are also provided with three, and the magnetic field strength is b+1, b+2, b+3. Among them, b>a. That is, at the position of the conveyor belt 430 with the same length from the solid waste conveyor belt 100, the magnetic field strength of the magnetic suction device 440 of the iron powder collection device 400 close to the crushing abrasive device 200 is smaller than the magnetic field strength of the magnetic suction device 440 of the iron powder collection device 400 far away from the crushing abrasive device 200. At the same time, for each iron powder collection device 400, the closer the magnetic block 442 of the magnetic suction device 440 is to the solid waste conveyor belt 100, the greater the magnetic field strength.

[0034] Through the above arrangement, fine iron powder can be collected first, and then larger particles of iron powder can be collected, so as to achieve separation of particles of different sizes, save energy for subsequent processing and improve efficiency.

[0035] The grinding device 200 comprises a grinding machine body, and an iron powder enrichment device 210 is arranged on the periphery of the grinding machine body. The iron powder enrichment device 210 is a permanent magnet or an electromagnet. The iron powder enrichment device 210 rotates around the periphery of the grinding machine body under the drive of a driving mechanism.

[0036] The iron powder enrichment device 210 includes a magnetic plate 211, a moving ring 212 fixedly connected to the magnetic plate 211, a fixed ring 213 rotatably connected to the moving ring 212, and a driving motor 214 for driving the moving ring 212 to rotate. As shown in the figure, the main body of the grinding machine is cylindrical. The fixed ring 213 is sleeved on the grinding machine body. In order to make the rotation of the magnetic plate 211 more stable, two fixed rings 213 are provided and fixedly installed on the upper and lower parts of the grinding machine body. The moving ring 212 can be arranged at the lower part of the fixed ring 213, and the two are rotatably connected through a plane bearing. The moving ring 212 can also be arranged on the outside of the fixed ring 213, that is, it is sleeved on the outside of the fixed ring, and the two are connected through a bearing. Correspondingly, two fixed rings 213 are also provided. The upper and lower ends of the magnetic plate 211 are perpendicular to the moving ring and fixedly connected. At this time, under the drive of an external force, the magnetic plate 211 can rotate along the outer wall of the grinding machine body. The magnetic plate 211 can be a permanent magnet or an electromagnet.

[0037] During the abrasive grinding process, when the magnetic plate 211 rotates to a position, if iron powder or particles are generated inside the abrasive machine, the magnetic plate 211 adsorbs them on the outer wall of the abrasive machine body. When the magnetic plate 211 leaves the current position, the iron powder or particles adsorbed on the outer wall of the abrasive machine naturally fall along the outer wall.

[0038] The grinding machine body can be configured as a double layer including an outer wall 221 and an inner wall 222, the inner layer is a mesh structure, that is, the inner wall 222 is configured as a mesh, and the structural strength is large. At the same time, a baffle is provided at the lower part of the inner wall to form a particle collection area with the outer layer. A particle outlet hole is provided at the lower part of the particle collection area to guide the collected particles to the second solid waste conveyor belt 110. If the outlet hole and the second solid waste conveyor belt 110 are not in a positional relationship of overlapping up and down, the iron powder adsorbed on the outer wall can be introduced into the second solid waste conveyor belt 110 by connecting a conduit.

[0039] In addition to the above embodiments, the iron powder enrichment device 210 can be an electromagnet matrix evenly distributed on the outer wall of the grinding machine body. That is, the electromagnets are evenly arranged around it in a circle, and then multiple layers are arranged, that is, multiple circles are arranged. The driving mechanism of the iron powder enrichment device 210 can be a controller, and a driving control program is set in the controller. According to the set program, the electromagnets in the electromagnet matrix are energized one by one, thereby achieving the effect of rotational suction, and the iron powder inside the grinding machine body is adsorbed to the outer wall.

[0040] After the iron powder is recovered by the iron powder collecting device 400, the solid waste collected by the iron powder is tested, and the solid waste containing iron is crushed again to extract iron, and the solid waste without iron powder enters the subsequent processing procedure. Therefore, a packing device 300 is set at the lower part of the left end of the solid waste conveyor belt 100. The packing device 300 includes an iron detection sensor 310 and a packing mechanism 320. The iron detection sensor 310, the packing mechanism 320 and the controller are electrically connected, and the controller controls the packing mechanism 320 to load the solid waste on the solid waste conveyor belt 100 into different collection devices or import them into different material conveyor belts according to the detection result of the iron detection sensor 310. The packing mechanism 320 can be implemented in the following ways.

[0041] First, the subpackaging mechanism 320 includes a subpackaging conveyor belt 321 and a driving motor. The driving motor and the controller are electrically connected to control the forward and reverse rotation of the driving motor. The transmission direction of the subpackaging conveyor belt 321 is controlled by the forward and reverse rotation of the driving motor. The destination position of the solid waste transported on the subpackaging conveyor belt 321 is different due to different transmission directions. As shown in the figure, the subpackaging conveyor belt 321 is sleeved on a driving wheel and a driven wheel, and the driving motor drives the driving wheel to rotate. Since the length of the subpackaging conveyor belt 321 of the subpackaging mechanism 320 is relatively small, a supporting mechanism may not be provided in the middle. The lower parts of the two ends of the subpackaging conveyor belt 321 are provided with iron-containing solid waste collectors and iron-free solid waste collectors, and iron-containing solid waste conveyor belts and iron-free solid waste conveyor belts may also be provided respectively. Among them, the iron-containing solid waste conveyor belt can transport the subpacked solid waste to the crushing abrasive device 200 for further processing. The iron-free solid waste conveyor belt can transport the solid waste to a subsequent solid waste treatment system.

[0042] The solid waste on the solid waste conveyor belt 100 may contain iron at a certain point or at a certain section. If there are continuous points containing iron solid waste, the drive motor will continuously adjust the forward and reverse installation, so the system cannot operate normally and may also burn out the drive. Therefore, a continuity detection circuit is set. The iron detection sensor 310 can be an eddy current sensor, a capacitive sensor or a Hall sensor. The output end of the sensor can be a normally open contact or a normally closed contact. In this embodiment, the normally open contact closure after the iron solid waste has been detected is used as an example to illustrate the continuity detection circuit. The circuit includes a power-off delay relay. The normally open contact of the iron detection sensor 310 is electrically connected to the coil winding of the power-off delay relay. The normally open contact of the power-off delay relay is electrically connected to the controller or connected in parallel with the forward and reverse buttons of the forward and reverse installation control circuit of the motor. Taking the connection with the controller as an example, the working principle of the power-off delay relay is that after the coil winding is energized, its normally open contact is closed, and after the coil winding loses power, the normally open contact is disconnected after a set time delay. At this time, if the iron detection sensor 310 does not detect the iron signal and is disconnected, the controller still receives the detected signal. If the undetected signal lasts for a very short time, the continuous rotation of the motor can be guaranteed, thereby reducing the control of the forward and reverse rotation of the motor. Among them, the delay time setting can follow the following method. The delay time of the power-off delay relay is greater than the time taken for the solid waste conveyor belt 100 to move from the position of the iron detection sensor 310 to the position of the discharge end of the solid waste conveyor belt 100. Alternatively, the set time is t1, t1=(s+d) / v, where s is the distance from the iron detection sensor 310 to the discharge end, and d is half the length of the packaging conveyor belt 321. Within the t1 period, if iron-containing solid waste is detected again, this small section of solid waste will not be sorted into the iron-free solid waste collection device, thereby reducing the switching of the motor rotation direction and improving the efficiency of operation.

[0043] Secondly, the sub-packaging mechanism 320 includes a sub-packaging balance plate 322, a fixed support mechanism 323, and a telescopic support mechanism 324. Figure 5 As shown, the lower part of both ends of the sub-assembly balance plate 322 is provided with a solid waste collection device for collecting iron-containing solid waste and iron-free solid waste. The upper end of the fixed support mechanism 323 is hingedly connected to the bottom of one end of the sub-assembly balance plate 322. In order to achieve that the end of the sub-assembly balance plate 322 can point to the solid waste collection device at its lower part in the tilted state, the end of the fixed support mechanism 323 is hingedly connected to the inner position of the end of the sub-assembly balance plate 322. A chute is provided at the lower part of the sub-assembly balance plate 322, and the telescopic end of the telescopic support mechanism 324 is slidably inserted in the chute. Alternatively, two chute are provided at the lower part of the sub-assembly balance plate 322, and the two chute are parallel in the length direction thereof. A cross bar is provided at the free end of the telescopic support mechanism 324, and rollers that can slide in the chute are provided at both ends of the cross bar to increase the stability of the sub-assembly balance plate 322. Among them, the telescopic support mechanism 324 is an electrically controlled hydraulic rod, an electric telescopic rod or an electric cam. The telescopic support mechanism 324 is fixedly installed on the ground and is telescopic vertically. When extended, the solid waste is dumped into the solid waste collection device on the left side, and when shortened, the solid waste is dumped into the solid waste collection device on the right side.

[0044] Third, the subassembly mechanism 320 includes a subassembly balance plate 322, a fixed support mechanism 323 and a drive motor. A rotating shaft is provided in the middle of the subassembly balance plate 322, and the rotating shaft is connected to the support mechanism through a bearing to support the subassembly balance plate 322. The rotating shaft of the drive motor is connected to the rotating shaft in the middle of the subassembly balance plate 322, or the two are connected through a reducer. The tilt of the subassembly balance plate 322 is controlled by controlling the rotation of the drive motor. The drive motor is electrically connected to the controller.

[0045] The continuous separation system of iron powder in casting solid waste can realize continuous iron recovery of solid waste until the solid waste contains no iron. In actual operation, in order to realize continuous solid waste treatment, a statistical time ta can be set. The time tc that the iron detection sensor 310 detects the iron material is accumulated within the statistical time, and the proportion of iron-containing solid waste μ=tc / ta is calculated. When μ is greater than the set threshold, new solid waste material is added to the crushing and abrasive device 200. During operation, the iron-containing solid waste sorted out by the packaging device 300 is input into the crushing and abrasive device 200 again by setting a return conveyor belt.

[0046] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Through the above description, relevant staff can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the contents of the specification. All so-called equal changes and modifications of the shapes, structures, features and spirits described in the scope of the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A system for continuous separation of iron powder from foundry solid waste, comprising a controller, characterized in that: It comprises a solid waste conveyor belt (100), a crushing and abrasive device (200) arranged at the upper part of one end of the solid waste conveyor belt (100), a packaging device (300) arranged at the lower part of the other end of the solid waste conveyor belt (100), and an iron powder collecting device (400) arranged in the middle of the solid waste conveyor belt (100); the crushing and abrasive device (200) inputs crushed solid waste onto the solid waste conveyor belt (100); The iron powder collecting device (400) comprises a driving roller (410), a driven roller (420), and a conveyor belt (430) wound around the driving roller (410) and the driven roller (420); a magnetic attraction device (440) is arranged between the upper and lower surfaces of the conveyor belt (430); the magnetic field of the magnetic attraction device (440) covers the lower part of the conveyor belt; the conveyor belt (430) is perpendicular to the solid waste conveyor belt (100), and the iron powder collecting device is arranged at the lower part of the conveyor belt (430); the magnetic field strength of the lower part of the conveyor belt (430) is greater in the direction close to the solid waste conveyor belt (100) than in the direction close to the iron powder collecting device; The packaging device (300) detects the solid waste after the iron powder is collected, transfers the solid waste containing iron to the crushing and abrasive device (200), and collects the solid waste without iron for subsequent treatment.

2. The continuous separation system of iron powder in foundry solid waste according to claim 2 is characterized by: The iron powder collecting devices (400) are provided in plurality and are used to sort iron powders of different sizes; At a position of the conveyor belt (430) of the same length from the solid waste conveyor belt (100), the magnetic field strength of the magnetic attraction device (440) of the iron powder collection device (400) close to the crushing abrasive device (200) is smaller than the magnetic field strength of the magnetic attraction device (440) of the iron powder collection device (400) far from the crushing abrasive device (200).

3. The continuous separation system of iron powder in foundry solid waste according to claim 1, characterized in that: The pulverizing abrasive device (200) comprises a grinding machine body, and an iron powder enrichment device (210) is arranged on the periphery of the grinding machine body. The iron powder enrichment device (210) is a permanent magnet or an electromagnet. The iron powder enrichment device (210) rotates around the periphery of the grinding machine body under the drive of a driving mechanism.

4. A system for continuous separation of iron powder from foundry solid waste according to claim 1, 2 or 3, characterized in that: The grinding machine body is double-layered, and the inner layer is a mesh structure.

5. The continuous separation system of iron powder in foundry solid waste according to claim 4 is characterized by: The subpackaging device (300) comprises an iron detection sensor (310) and a subpackaging mechanism (320); the iron detection sensor (310), the subpackaging mechanism (320) and a controller are electrically connected; the controller controls the subpackaging mechanism (320) to load the solid waste on the solid waste conveyor belt (100) into different collection devices or guide the solid waste into different material conveyor belts according to the detection result of the iron detection sensor (310).

6. The continuous separation system of iron powder in foundry solid waste according to claim 5, characterized in that: The packaging mechanism (320) comprises a packaging conveyor belt (321) and a drive motor, and the drive motor is electrically connected to a controller to control the forward and reverse rotation of the drive motor.

7. The continuous separation system of iron powder in foundry solid waste according to claim 5, characterized in that: The subassembly mechanism (320) comprises a subassembly balance plate (322), a fixed support mechanism (323), and a telescopic support mechanism (324); the upper end of the fixed support mechanism (323) is hingedly connected to the bottom of one end of the subassembly balance plate (322); a slide groove is provided at the lower part of the subassembly balance plate (322), and the telescopic end of the telescopic support mechanism (324) is slidably inserted into the slide groove; The telescopic support mechanism (324) is an electrically controlled hydraulic rod, an electrically powered telescopic rod or an electrically powered cam.

8. A system for continuous separation of iron powder from foundry solid waste according to claim 5, 6 or 7, characterized in that: The normally open contact of the iron detection sensor (310) is electrically connected to the coil winding of the power-off delay relay, and the normally open contact of the power-off delay relay is electrically connected to the controller. The delay time of the power-off delay relay is greater than the time taken for the solid waste conveyor belt (100) to move from the position of the iron detection sensor (310) to the position of the discharge end of the solid waste conveyor belt (100).

9. The continuous separation system of iron powder in foundry solid waste according to claim 4, characterized in that: A baffle is arranged at the lower part of the mesh structure of the inner layer to form a particle collection area with the outer layer, and a particle outlet hole is arranged at the lower part of the particle collection area; It also includes a second solid waste conveyor belt (110), wherein the second solid waste conveyor belt (110) is equipped with a packaging device (300) and an iron powder collecting device (400); The lower part of the particle outlet hole is the second solid waste conveyor belt (110), or the particle outlet hole is drained to the second solid waste conveyor belt (110) through a conduit.

10. A system for continuous separation of iron powder from foundry solid waste according to claim 8 or 9, characterized in that: A statistical time ta is set, and the time tc during which the iron detection sensor (310) detects iron material is accumulated within the statistical time, and the iron-containing solid waste ratio μ=tc / ta is calculated. When μ is greater than a set threshold value, new solid waste material is added to the crushing abrasive device (200).

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