A re-crushing mechanism for domestic waste incineration slag, its crushing device and control method

Abstract

The present invention provides a re-crushing mechanism for domestic waste incineration slag, its crushing device and control method; the re-crushing mechanism includes an hourglass-shaped crushing moving body and a crushing stationary body, which enclose a circular crushing cavity for crushing domestic waste incineration slag. The crushing moving body is driven to rotate by a rotating shaft and realizes dynamic swinging by a plurality of first electromagnets and second electromagnets. The electromagnets not only drive the crushing moving body to swing flexibly to achieve multi-directional extrusion and shear crushing, but also delay the falling of iron-containing residues through magnetic field adsorption, increase the number of crushing times, and at the same time separate from non-magnetic residues. The receiving turntable synchronously collects and partitions according to the falling time difference between magnetic residues and non-magnetic residues, completing crushing and preliminary separation. The device integrates the functions of crushing and separation, significantly improving the crushing efficiency and resource utilization rate, and is particularly suitable for the efficient treatment and resource utilization of domestic waste incineration slag.

Description

Technical Field

[0001] The present invention belongs to the technical field of solid waste treatment and resource utilization, and particularly relates to a re-crushing mechanism, a crushing device and a control method for domestic waste incineration slag. Background Art

[0002] With the acceleration of the urbanization process, the generation amount of domestic waste is increasing continuously, and the harmless, reduction and resource utilization of waste have become the focus of social attention. The domestic waste incineration technology is one of the current mainstream waste treatment methods, and its advantage lies in the significant reduction effect. However, a large amount of slag will be generated during the incineration process, which contains metals (such as iron blocks), glass, minerals and unburned organic matters. These slags not only have strong heterogeneity and complex components, but also have the characteristics of large particle size difference and high hardness. Therefore, how to efficiently crush and separate different components in the incineration slag has become a technical problem in resource utilization.

[0003] 1. Status Quo of Traditional Crushing Technologies

[0004] The crushing treatment of existing domestic waste incineration slag usually adopts the following two types of equipment:

[0005] Cone crusher: The material is crushed by the eccentric swing and extrusion force between the moving cone and the fixed cone.

[0006] Disadvantages: During the eccentric swing process, other channels in the crushing cavity will become larger, which is easy to cause large pieces of residue to pass directly through and cannot be fully crushed. It has poor adaptability to special-shaped materials (such as sharp metals or glass), and is easy to cause equipment jamming or blockage. It lacks a dynamic adjustment function and cannot adjust the crushing strength and gap for complex materials.

[0007] Hammer crusher: The material is crushed by the high-speed rotating hammer heads.

[0008] Disadvantages: The crushing effect on hard materials (such as metals and glass) is limited, and it is easy to cause rapid wear of the hammer heads. It is not suitable for processing complex mixed materials, and the crushing efficiency is low.

[0009] In addition, these traditional crushing devices usually cannot realize the separation function of materials, and additional magnetic separation equipment needs to be added for subsequent treatment, which not only increases the complexity of the process flow, but also increases the equipment cost and energy consumption.

[0010] 2. Status Quo and Deficiencies of Iron-Containing Residue Separation

[0011] The separation of iron-containing residues in the incineration slag is usually completed by magnetic separation equipment. However, the traditional magnetic separation method has the following problems: The magnetic residues still contain relatively large particles after crushing, which affects the separation efficiency; It cannot directly complete the separation during the crushing process, and additional processes and equipment need to be added, reducing the processing efficiency.

[0012] 3. Technical requirements

[0013] Based on the above problems, there is an urgent need in the current technology for a device that can efficiently crush the municipal solid waste incineration slag with strong heterogeneity and high hardness, and simultaneously realize the synchronous separation of magnetic residues and non-magnetic residues, so as to:

[0014] Avoid the slipping and unbroken passing of large residues;

[0015] Improve the crushing uniformity and adapt to multi-component complex materials;

[0016] Simplify the crushing and separation processes and reduce the equipment operation cost. Summary of the invention

[0017] Therefore, the purpose of the present invention is to provide a re-crushing mechanism and its crushing device for municipal solid waste incineration slag. The device integrates the functions of crushing and separation, significantly improves the crushing efficiency and resource utilization rate, and is particularly suitable for the efficient treatment and resource utilization of municipal solid waste incineration slag.

[0018] To solve the above technical problems, according to one aspect of the present invention, the following technical solutions are provided:

[0019] A re-crushing mechanism for municipal solid waste incineration slag, comprising an hourglass-shaped crushing moving body and a crushing fixed body with an hourglass-shaped inner arc surface sleeved around the crushing moving body at intervals; an annular crushing cavity is enclosed by the crushing moving body and the crushing fixed body; a feed hopper is arranged above the crushing cavity, and a receiving turntable is arranged below; a rotating shaft is vertically penetrated through the center of the crushing moving body; the rotating shaft is connected to the inner wall of the crushing moving body through a plurality of first elastic telescopic sleeve rods to drive the crushing moving body to rotate; a plurality of first electromagnets are evenly embedded in the upper and lower parts of the crushing moving body along the horizontal ring surface of the crushing moving body; corresponding to the first electromagnets of the crushing moving body, second electromagnets are embedded in the crushing fixed body, and a controller controls the rotation speed of the rotating shaft, respectively controls the on-off and current directions of each first electromagnet and each second electromagnet, so as to control the rotation and swing of the crushing moving body.

[0020] Wherein, the middle parts of the crushing moving body and the crushing fixed body are made of a first wear-resistant, impact-resistant and magnetic isolation material, which isolates the upper and lower parts of the crushing moving body and the crushing fixed body.

[0021] Wherein, the upper and lower parts of the crushing moving body and the crushing fixed body are spaced apart along their horizontal ring surfaces with a second wear-resistant, impact-resistant and magnetic isolation material, and the part between two adjacent second wear-resistant, impact-resistant and magnetic isolation materials is a magnetic conductive metal, and the first electromagnets and the second electromagnets are arranged behind the magnetic conductive metal.

[0022] Among them, the first wear-resistant, impact-resistant and magnetic-separating material and the second wear-resistant, impact-resistant and magnetic-separating material are silicon nitride ceramics, austenitic stainless steel, tin bronze or tungsten carbide-cobalt alloy; the magnetic conductive metal is silicon steel, cast iron, high manganese steel or a composite structure of the three.

[0023] Among them, both ends of the first elastic telescopic rod are respectively hinged to the rotating shaft and the inner wall of the crushing moving body; multiple first elastic telescopic rods are divided into two groups and are respectively arranged at the upper and lower parts of the crushing moving body; multiple first elastic telescopic rods in each group are respectively arranged around the rotating shaft evenly.

[0024] Among them, a first bearing disc is supported below the crushing moving body; the first bearing disc is connected to the base through multiple second elastic telescopic rods; both ends of the second elastic telescopic rod are respectively hinged to the first bearing disc and the base.

[0025] Among them, a first motor is connected to and drives the rotating shaft to rotate; a second motor drives the receiving turntable to rotate through a gear, and a second bearing disc is arranged below the receiving turntable and supports its horizontal rotation; the receiving turntable is divided into multiple independent receiving bins around its center.

[0026] A control method for a re-crushing mechanism of domestic waste incineration slag includes the following steps:

[0027] (1) Feeding and crushing preparation:

[0028] Feeding: Domestic waste incineration slag is introduced into an annular crushing cavity formed by enclosing a hourglass-shaped crushing moving body and a hourglass-shaped crushing stationary body through a feed hopper, and the slag includes magnetic residues and non-magnetic residues;

[0029] Crushing cavity initialization: A plurality of first electromagnets and second electromagnets are evenly arranged on the horizontal ring surfaces of the crushing moving body and the crushing stationary body, and each group of electromagnets can independently control its on-off state and current direction;

[0030] (2) Rotating shaft driving and initial rotation:

[0031] Rotating shaft rotation control:

[0032] The rotating shaft is driven to rotate by the first motor, and its initial rotation speed is set by the controller to meet the basic crushing rate requirement:

[0033] ;

[0034] Among them, the initial rotation speed of the rotating shaft (unit: revolutions per second) is used to ensure uniform crushing of the material; : The quantization signal of the uniform distribution degree of the material in the crushing cavity; : The feeding time per unit time (unit: second), which is monitored by the feeding controller;

[0035] Flexible adjustment of the first elastic telescopic rod

[0036] The rotating shaft is connected to the inner wall of the crushing moving body through multiple first elastic telescopic rods, maintaining a stable gap in the crushing cavity during rotation and allowing the crushing moving body to swing in multiple directions at the same time.

[0037] (3) 360° swing control of the first electromagnet and the second electromagnet

[0038] Group arrangement of electromagnets

[0039] The first electromagnet and the second electromagnet are evenly arranged in several groups along the horizontal toroidal surface, numbered ;

[0040] Swing direction control

[0041] The controller realizes the multi-directional swing of the crushing moving body by independently controlling each group of the first electromagnet and the second electromagnet and changing their energizing directions:

[0042] ; where : The switching period (unit: second) of the th group of electromagnets determines the swing frequency of the crushing moving body; : The swing frequency of the crushing moving body (unit: hertz), which is adjusted in real time by the controller to ensure uniform force in the crushing cavity;

[0043] Swing angle optimization

[0044] ; where The swing angle (unit: degree) corresponding to the th group direction determines the yaw amplitude of the crushing moving body; : The basic swing angle (unit: degree), which is used to ensure the basic extrusion effect in the crushing cavity; : The swing angle adjustment coefficient (unit: degree / density), which is used to respond to the change of material density; The material density (unit: kg / m³) in the th direction in the crushing cavity;

[0045] 360° continuous swing

[0046] The controller switches the electromagnets group by group in a clockwise or counterclockwise order to ensure that the crushing moving body realizes a 360° continuous swing in the horizontal direction, covering the entire annular crushing cavity;

[0047] (4) Delayed falling of magnetic residues

[0048] Magnetic field adsorption and falling delay

[0049] ; wherein, : the falling delay time of the magnetic residue (unit: second), which is determined by magnetic field adsorption and switching; The switching period of the electromagnet (unit: second), which determines the initial adsorption time of the magnetic residue; The delay time adjustment coefficient (unit: second / kg); : the total amount of magnetic residue in the current crushing cavity (unit: kilogram), which is monitored by a sensor;

[0050] Magnetic field cut-off release:

[0051] When the magnetic field is switched to the off state, the magnetic residue falls onto the receiving turntable;

[0052] (5) Partition adjustment of the receiving turntable

[0053] Rotating speed control of the turntable:

[0054] ; wherein, : the rotating speed of the receiving turntable (unit: degree / second), which is used to ensure accurate partitioning; : the partition angle interval of the receiving bin (unit: degree), which determines the coverage range of different receiving bins; The time interval between the falling of magnetic residue and non-magnetic residue (unit: second);

[0055] Synchronous partitioning:

[0056] According to the delay time of the magnetic residue and the rapid falling time of the non-magnetic residue, the controller dynamically adjusts the turntable angle so that the magnetic residue and the non-magnetic residue fall into different receiving bins respectively;

[0057] (6) Completion of crushing and separation

[0058] After multiple delayed crushings, the particle size of the magnetic residue is refined and it falls into the designated receiving bin;

[0059] The non-magnetic residue falls rapidly and falls into other receiving bins for subsequent processing.

[0060] A crushing device employing the re-crushing mechanism described above.

[0061] The present invention provides a re-crushing mechanism and a crushing device suitable for the slag of domestic waste incinerators. Through the hourglass-shaped structure, dynamic swing control of the electromagnet, and integrated design of crushing and separation, it overcomes many deficiencies of traditional cone crushers and realizes more efficient and accurate material processing. Its beneficial effects are specifically embodied as follows:

[0062] 1. Innovative structural design to solve the problem of large residue remaining

[0063] Hourglass-shaped crushing cavity design: The annular crushing cavity formed by the moving crushing body and the fixed crushing body adopts a design with a contracted middle part in the shape of an hourglass, forcing the material to concentrate in the contraction area for crushing. Compared with the problem of the enlarged channels in other positions and the easy slippage of large residues caused by eccentric swing in traditional cone crushers, the hourglass-shaped crushing cavity effectively avoids the slippage and omission of materials and improves the crushing effect.

[0064] No dead angle in the annular crushing cavity: The crushing force of traditional cone crushers is concentrated at the contact point between the moving cone and the fixed cone, with obvious crushing dead angles. In the present invention, through the hourglass-shaped moving crushing body that swings dynamically by 360°, the material is evenly distributed in the annular crushing cavity, eliminating the crushing dead angles and ensuring that all materials can be fully crushed.

[0065] 2. Dynamic crushing control to improve crushing efficiency and adaptability

[0066] Dynamic control of the swing by electromagnets: In the present invention, through the on-off and current direction control of the first electromagnet and the second electromagnet, the dynamic swing of the moving crushing body is realized, and the swing direction and amplitude can be adjusted in real time according to the density, hardness and shape of the material in the crushing cavity. Compared with the fixed eccentric swing design of traditional cone crushers, the dynamic swing mode increases the action points of the moving crushing body, improves the crushing efficiency for complex and irregularly shaped materials, and is especially suitable for processing mixed materials with multiple components in the slag of domestic waste incinerators.

[0067] 3. Integration of magnetic separation and enhanced crushing

[0068] Delayed falling of magnetic residues: In the present invention, by utilizing the magnetic field adsorption characteristics of electromagnets, the magnetic residues (such as iron blocks) in the crushing cavity are subjected to delayed falling treatment, so that they stay in the crushing cavity for a longer time. This multiple crushing enhancement method improves the crushing rate of magnetic residues, especially with obvious refinement effect on hard materials such as iron blocks.

[0069] Synchronous crushing and separation: The magnetic residues fall down with delay through electromagnetic adsorption, while the non-magnetic residues fall down quickly. Combined with the dynamic zoning design of the receiving turntable, the preliminary separation of magnetic and non-magnetic residues is realized. Compared with the design of traditional cone crushers that require additional magnetic separation equipment, the present invention directly completes the separation during the crushing process, simplifying the equipment configuration and technological process.

[0070] The present invention not only solves the structural deficiencies of traditional equipment, but also achieves a comprehensive breakthrough in terms of adaptability, versatility and efficiency, and has significant practical application value. Brief description of the drawings

[0071] To more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and detailed embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. Among them:

[0072] Figure 1 is a vertical sectional view of the crushing mechanism of the present invention in its normal state;

[0073] Figure 2 is a vertical sectional view of the crushing mechanism of the present invention during operation;

[0074] Figure 3 is a structural diagram of the crushing moving body of the present invention.

[0075] In the figure, 1, crushing moving body; 2, crushing fixed body; 3, annular crushing chamber; 4, feeding hopper; 5, material receiving turntable; 51, independent material receiving compartment; 6, rotating shaft; 61, first elastic telescopic sleeve rod; 7, first electromagnet; 8, second electromagnet; 9, first wear-resistant and impact-resistant magnetic isolation material; 10, second wear-resistant and impact-resistant magnetic isolation material; 11, magnetically conductive metal; 12, first bearing plate; 13, second elastic telescopic sleeve rod; 14, base; 15, first motor; 16, second bearing plate; 17, second motor. Detailed Embodiments

[0076] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be made in conjunction with the accompanying drawings.

[0077] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0078] To make the purpose, technical solution, and advantages of the present invention clearer, the following will further describe the embodiments of the present invention in detail in conjunction with the accompanying drawings.

[0079] See Figures 1 to 3, A re-crushing mechanism and a crushing device for domestic waste incineration slag, comprising an hourglass-shaped crushing moving body 1 and a crushing fixed body 2 with an hourglass-shaped inner arc surface sleeved outside the crushing moving body 1 at intervals; the crushing moving body 1 and the crushing fixed body 2 enclose an annular crushing chamber 3; a feeding hopper 4 is arranged above the crushing chamber 3, and a receiving turntable 5 is arranged below; a rotating shaft 6 vertically penetrates through the center of the crushing moving body 1; the rotating shaft 6 is connected to the inner wall of the crushing moving body 1 through a plurality of first elastic telescopic sleeve rods 61 to drive the crushing moving body 1 to rotate; a plurality of first electromagnets 7 are evenly embedded in the upper and lower parts of the crushing moving body 1 along the horizontal ring surface of the crushing moving body 1; corresponding to the first electromagnets 7 of the crushing moving body 1 in the crushing fixed body 2, second electromagnets 8 are correspondingly embedded, and a controller controls the rotation speed of the rotating shaft 6, and respectively controls the energization, power-off and current direction of each first electromagnet 7 and each second electromagnet 8, so as to control the rotation and swing of the crushing moving body 1.

[0080] Rotating speed of the rotating shaft: The rotation speed range is from 50 rpm to 300 rpm, and it is automatically adjusted according to the material quantity and load.

[0081] Working current of the electromagnet: The working current range of each group of electromagnets is from 2 A to 10 A, and the electromagnetic field strength range is from 0.5 T to 1.5 T, and it is dynamically adjusted to achieve the best crushing and separation effect.

[0082] Rotating speed of the receiving turntable: The rotation speed range is from 10 rpm to 100 rpm, and it is adjusted synchronously with the falling time of the magnetic residue and the non-magnetic residue.

[0083] Controller: The controller integrates a PLC system, and through sensors, it real-time collects data such as material load, magnetic residue content and particle size, and dynamically adjusts the parameters of the rotating shaft, electromagnet and receiving turntable.

[0084] Furthermore, the middle parts of the crushing moving body 1 and the crushing fixed body 2 are made of a first wear-resistant, impact-resistant and magnetic isolation material 9, which isolates the upper and lower parts of the crushing moving body 1 and the crushing fixed body 2.

[0085] Furthermore, the upper and lower parts of the crushing moving body 1 and the crushing fixed body 2 are distributed at intervals along their horizontal ring surfaces with a second wear-resistant, impact-resistant and magnetic isolation material 10, and the part between two adjacent second wear-resistant, impact-resistant and magnetic isolation materials 10 is a magnetic conductive metal 11, and the first electromagnets 7 and the second electromagnets 8 are arranged behind the magnetic conductive metal 11.

[0086] Furthermore, the first wear-resistant, impact-resistant and magnetic isolation material 9 and the second wear-resistant, impact-resistant and magnetic isolation material 10 are silicon nitride ceramics, austenitic stainless steel, tin bronze or tungsten carbide-cobalt alloy; the magnetic conductive metal is silicon steel, cast iron, high manganese steel or a composite structure of the three.

[0087] Further, both ends of the first elastic telescopic rod 61 are respectively hinged to the rotating shaft 6 and the inner wall of the crushing moving body 1; multiple first elastic telescopic rods 61 are divided into two groups and are respectively arranged at the upper and lower parts of the crushing moving body 1; multiple first elastic telescopic rods 61 in each group are evenly arranged around the rotating shaft 6.

[0088] Further, a first bearing disc 12 is supported below the crushing moving body 1; the first bearing disc 12 is connected to the base 14 through multiple second elastic telescopic rods 13; both ends of the second elastic telescopic rod 13 are respectively hinged to the first bearing disc 12 and the base 14.

[0089] Further, the rotating shaft 6 is driven to rotate by a first motor 15.

[0090] Further, the material receiving turntable 5 is divided into multiple independent material receiving compartments 51 around its center; a second bearing disc 16 is supported below the material receiving turntable 5; the material receiving turntable 5 is driven to rotate by a second motor 17.

[0091] A method for re-crushing and separating domestic waste incineration slag is realized through the following steps in linkage:

[0092] S1. Feeding: The domestic waste incineration slag is introduced into the annular crushing cavity 3 formed by enclosing the hourglass-shaped crushing moving body 1 and the hourglass-shaped crushing stationary body 2 through the feeding hopper 4. The slag includes magnetic residues and non-magnetic residues.

[0093] S2. Rotation and swing of the crushing moving body: The rotating shaft 6 is used to drive the crushing moving body 1 to rotate through the first motor 15. At the same time, by the first electromagnet 7 embedded on the crushing moving body 1 and the second electromagnet 8 on the crushing stationary body 2, the on-off and current direction of the first electromagnet 7 and the second electromagnet 8 are controlled, so that the crushing moving body 1 generates a swing while rotating, and cooperates with the crushing stationary body 2 to crush the slag in the annular crushing cavity 3.

[0094] Among them, the magnetic residues delay falling: When the first electromagnet 7 and the second electromagnet 8 are energized, a magnetic field is generated to attract the magnetic residues in the annular crushing cavity 3, delaying their falling time, and when the magnetic field is disconnected, the magnetic residues are allowed to fall.

[0095] The non-magnetic residues fall quickly: The non-magnetic residues are not attracted by the magnetic field and directly fall to the bottom of the crushing cavity by gravity.

[0096] S3. Separation and collection: Using the material receiving turntable 5, the second motor 17 is used to drive the material receiving turntable 5 to rotate synchronously. The material receiving turntable 5 is divided into multiple independent material receiving compartments 51. According to the time difference between the delayed falling of the magnetic residues and the quick falling of the non-magnetic residues, the magnetic residues and the non-magnetic residues are respectively collected into different material receiving compartments 51.

[0097] S4. Optimization of the number of crushing times: Due to the delayed falling, the magnetic residues are repeatedly squeezed and sheared by the moving crusher body 1 and the fixed crusher body 2 in the crushing cavity, thus being further refined, which is convenient for subsequent screening and separation.

[0098] S5. Dynamic adjustment: By controlling the first electromagnet 7 and the second electromagnet 8 and adjusting the rotation speed of the rotating shaft 6, the gap between the moving crusher body 1 and the fixed crusher body 2 is dynamically adjusted to meet the crushing requirements of slag with different particle sizes and hardnesses.

[0099] More specifically,

[0100] (1) Feeding and crushing preparation

[0101] Feeding: The slag from the domestic waste incinerator is introduced into the annular crushing cavity 3 formed by enclosing the hourglass-shaped moving crusher body 1 and the hourglass-shaped fixed crusher body 2 through the feeding hopper 4. The slag includes magnetic residues and non-magnetic residues.

[0102] Initialization of the crushing cavity: A plurality of first electromagnets 7 and second electromagnets 8 are uniformly arranged on the horizontal ring surfaces of the moving crusher body 1 and the fixed crusher body 2, and each group of electromagnets can independently control their on-off states and current directions.

[0103] (2) Rotating shaft drive and initial rotation

[0104] 1. Control of the rotating shaft rotation:

[0105] The rotating shaft 6 is driven to rotate by the first motor 15, and its initial rotation speed is set by the controller to meet the basic crushing rate requirement:

[0106] ;

[0107] Among them, The initial rotation speed of the rotating shaft (unit: revolutions per second) is used to ensure uniform crushing of the material; : The quantization signal of the uniform distribution degree of the material in the crushing cavity (unit: dimensionless, value range 0 - 1); : The feeding time per unit time (unit: second), which is monitored by the feeding controller.

[0108] 2. Flexible adjustment of the first elastic telescopic rod 61:

[0109] The rotating shaft is connected to the inner wall of the moving crusher body 1 through multiple first elastic telescopic rods 61, maintaining a stable gap in the crushing cavity during rotation, and at the same time allowing the moving crusher body to swing in multiple directions.

[0110] (3) 360° swing control of the first electromagnet and the second electromagnet

[0111] 1. Group arrangement of the electromagnets:

[0112] The first electromagnet 7 and the second electromagnet 8 are evenly arranged in several groups along the horizontal toroidal surface, numbered as the total number of electromagnets on the toroidal surface).

[0113] 2. Swing direction control:

[0114] The controller independently controls each group of the first electromagnet and the second electromagnet, changes their energizing directions, and realizes the multi-directional swing of the crushing moving body 1:

[0115] ; among them, : The switching period of the th group of electromagnets (unit: second), which determines the swing frequency of the crushing moving body; : The swing frequency of the crushing moving body (unit: hertz), which is adjusted in real time by the controller to ensure uniform force in the crushing cavity.

[0116] 3. Swing angle optimization:

[0117] ; among them, The swing angle corresponding to the th group direction (unit: degree), which determines the yaw amplitude of the crushing moving body; : The basic swing angle (unit: degree), which is used to ensure the basic extrusion effect in the crushing cavity; : The swing angle adjustment coefficient (unit: degree / density), which is used to respond to the change of material density; The material density in the th direction in the crushing cavity (unit: kilogram per cubic meter).

[0118] 4. 360° continuous swing:

[0119] The controller switches the electromagnets group by group in a clockwise or counterclockwise order to ensure that the crushing moving body realizes a 360° continuous swing in the horizontal direction, covering the entire annular crushing cavity.

[0120] (4) Delayed falling of magnetic residues

[0121] 1. Magnetic field adsorption and falling delay:

[0122] ; among them, : The falling delay time of magnetic residues (unit: second), which is determined by magnetic field adsorption and switching; The electromagnet switching period (unit: second), which determines the initial adsorption time of magnetic residues; The delay time adjustment coefficient (unit: second / kilogram); : The total amount of magnetic residues in the current crushing cavity (unit: kilogram), which is monitored by a sensor.

[0123] 2. Magnetic field disconnection release:

[0124] When the magnetic field switches to the off state, the magnetic residue falls onto the material receiving turntable 5.

[0125] (5) Partition adjustment of the material receiving turntable

[0126] 1. Rotation speed control of the turntable:

[0127] ; where : The rotation speed of the material receiving turntable (unit: degrees / second), used to ensure accurate partitioning; : The partition angle interval of the material receiving bin (unit: degrees), which determines the coverage range of different material receiving bins; The time interval between the fall of magnetic residue and non-magnetic residue (unit: seconds).

[0128] 2. Synchronous partitioning:

[0129] According to the delay time of the magnetic residue and the rapid fall time of the non-magnetic residue, the controller dynamically adjusts the turntable angle so that the magnetic residue and the non-magnetic residue fall into different material receiving bins 51 respectively.

[0130] (6) Completion of crushing and separation

[0131] The magnetic residue is refined in particle size after multiple delayed crushings and falls into the designated material receiving bin;

[0132] The non-magnetic residue falls rapidly and falls into other material receiving bins for subsequent processing.

[0133] The following is the test summary of the present invention:

[0134] 1. Test parameters

[0135] Rotational speed of the crushing moving body (rpm): 100 - 250, adjustable, representing the rotational speed of the crushing moving body.

[0136] Oscillation frequency (Hz): 1.0 - 1.8, the dynamic oscillation frequency driven by the electromagnet.

[0137] Magnetic field intensity (T): 1.0 - 1.8, the magnetic field intensity generated by the electromagnet.

[0138] Rotational speed of the material receiving turntable (rpm): 50 - 80, dynamically adjusted according to the material separation requirements.

[0139] 2. Residue composition:

[0140] Metal content: mainly magnetic residues such as iron blocks and iron filings.

[0141] Glass content: non-magnetic material with a relatively large particle size distribution.

[0142] Mineral content: including high-temperature resistant substances, with relatively high hardness.

[0143] Unburned organic matter: a small amount of incompletely burned organic residues.

[0144] Specifically, the material source: uniform sampling of incinerator slag, and the content of batch materials is within the following range:

[0145] Metal content: 20% - 30%, particle size about 10 - 50 mm.

[0146] Glass content: 30% - 40%, particle size about 5 - 30 mm.

[0147] Mineral content: 25% - 35%, with relatively high hardness, particle size about 10 - 40 mm.

[0148] Unburned organic matter: 5% - 15%, mainly carbonaceous substances.

[0149] 3. Test environment: Room temperature: 20°C ± 5°C.

[0150] 4. Equipment status: Clean and zero-calibrate before each group of tests to ensure consistency.

[0151] 5. Test objectives:

[0152] Optimize the crushing effect and improve the compliance rate of the material particle size.

[0153] Improve the separation purity of magnetic residues and the separation efficiency of non-magnetic residues.

[0154] Reduce the unbroken rate of residues and optimize resource utilization.

[0155] 6. The results are summarized in the following table:

[0156]

[0157] 7. Analysis of test results:

[0158] The comprehensive crushing effect has been significantly improved: The combination of the dynamic swing and the hourglass-shaped crushing cavity in the present invention makes the distribution of the crushing force more uniform, especially for better control of the particle size of hard minerals and glass. Through dynamic gap adjustment, the problem of large material slipping is reduced, achieving higher crushing efficiency.

[0159] The separation purity of magnetic residues is much higher than that of traditional equipment: The adsorption delay and multiple crushing functions of the electromagnet improve the refinement degree and purity of magnetic residues, avoiding the loss of magnetic materials caused by too large particle size in traditional equipment.

[0160] High separation efficiency and simplified process: The dynamic zoning design of the material receiving turntable synchronously completes the separation of magnetic and non-magnetic residues, reduces the use of additional separation equipment, and significantly reduces the equipment complexity and energy consumption.

[0161] The present invention is applicable to the scenario of processing multi-component complex materials, especially the efficient crushing and resource utilization of domestic waste incineration slag. It is recommended to be promoted in the resource utilization process. Combining the functions of magnetic and non-magnetic residue zoning collection can further improve the resource recovery rate.

[0162] Although the present invention has been described above with reference to the embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the disclosed embodiments of the present invention can be combined with each other in any way, and the exhaustive description of these combinations is omitted in this specification only for the consideration of saving space and resources. Therefore, the present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A re-crushing mechanism for domestic waste incineration slag, characterized in that: It includes an hourglass-shaped moving crushing body (1) and a fixed crushing body (2) with an hourglass-shaped inner arc surface sleeved outside the moving crushing body (1) at a certain interval; an annular crushing cavity (3) enclosed by the moving crushing body (1) and the fixed crushing body (2); a feed hopper (4) is arranged above the crushing cavity (3), and a receiving turntable (5) is arranged below; a rotating shaft (6) vertically penetrates through the center of the moving crushing body (1); the rotating shaft (6) is connected to the inner wall of the moving crushing body (1) through a plurality of first elastic telescopic rods (61) to drive the moving crushing body (1) to rotate; a plurality of first electromagnets (7) are evenly embedded in the upper and lower parts of the moving crushing body (1) along the horizontal ring surface of the moving crushing body (1); corresponding to the first electromagnets (7) of the moving crushing body (1) in the fixed crushing body (2), second electromagnets (8) are correspondingly embedded, and a controller controls the rotation speed of the rotating shaft (6), and respectively controls the on-off and current directions of each first electromagnet (7) and each second electromagnet (8), so as to control the rotation and swing of the moving crushing body (1); the receiving turntable (5) is divided into a plurality of independent receiving bins (51) around its center; a second bearing disc (16) is supported below the receiving turntable (5); the receiving turntable (5) is driven to rotate by a second motor (17). The control method of the re-crushing mechanism for municipal solid waste incineration slag includes the following steps: (1) Feeding and crushing preparation: Feeding: Municipal solid waste incineration slag is introduced into the annular crushing cavity (3) formed by enclosing the hourglass-shaped moving crushing body (1) and the hourglass-shaped fixed crushing body (2) through the feed hopper (4). The slag includes magnetic residues and non-magnetic residues. Initialization of the crushing cavity: A plurality of first electromagnets (7) and second electromagnets (8) are evenly arranged on the horizontal ring surfaces of the moving crushing body (1) and the fixed crushing body (2), and each group of electromagnets can independently control its on-off state and current direction. (2) Rotating shaft driving and initial rotation: Rotating shaft rotation control: The rotating shaft (6) is driven by the first motor (15) to rotate, and its initial rotational speed is set by the controller to meet the basic crushing rate requirement: ； Among them, The initial rotational speed of the rotating shaft is used to ensure uniform crushing of the material; : Quantification signal of the uniformity of material distribution in the crushing chamber; : The feeding time per unit time, monitored by the feeding controller; Flexible adjustment of the first elastic telescopic rod (61): The rotating shaft is connected to the inner wall of the moving crushing body (1) through a plurality of first elastic telescopic rods (61), maintaining a stable gap in the crushing cavity during rotation, and at the same time allowing the moving crushing body to swing in multiple directions. (3) 360° swing control of the first electromagnet and the second electromagnet: Group arrangement of electromagnets: The first electromagnet (7) and the second electromagnet (8) are evenly arranged in several groups along the horizontal toroidal surface and numbered as ; Swing direction control: The controller independently controls each group of first electromagnets and second electromagnets, changes their energizing directions, and realizes the multi-directional swing of the moving crushing body (1): ; wherein, : the switching period of the th group of electromagnets determines the swinging frequency of the crushing moving body; : the swinging frequency of the crushing moving body is adjusted in real time by the controller to ensure uniform force in the crushing cavity; Swing angle optimization: ; among them, The swing angle corresponding to the group direction determines the yaw amplitude of the crushing moving body; : basic swing angle, used to ensure the basic extrusion effect in the crushing cavity; : swing angle adjustment coefficient, used to respond to the change of material density; The material density in the direction in the crushing cavity; 360° continuous swing: The controller switches the electromagnets group by group in a clockwise or counterclockwise order to ensure that the moving crushing body realizes a 360° continuous swing in the horizontal direction, covering the entire annular crushing cavity. (4) Delayed falling of magnetic residues Magnetic field adsorption and falling delay: ; wherein, : the falling delay time of the magnetic residue, which is determined by magnetic field adsorption and switching; The electromagnet switching period determines the initial adsorption time of the magnetic residue; Delay time adjustment coefficient; : the total amount of magnetic residue in the current crushing cavity, which is monitored by a sensor; Demagnetization release: When the magnetic field is switched to the off state, the magnetic residues fall onto the receiving turntable (5). (5) Partition adjustment of the receiving turntable Rotating speed control of the turntable: ; wherein, : the rotation speed of the material receiving turntable, used to ensure accurate partitioning; : the angular interval of partitioning of the material receiving cabin, which determines the coverage range of different material receiving cabins; The time interval for the magnetic residue and the non-magnetic residue to fall; Synchronous partitioning: Based on the delay time of the magnetic residue and the rapid falling time of the non-magnetic residue, the controller dynamically adjusts the angle of the turntable so that the magnetic residue and the non-magnetic residue fall into different receiving bins (51) respectively; (6) Crushing and separation are completed After multiple delayed crushings, the particle size of the magnetic residue is refined and it falls into the designated receiving bin; the non-magnetic residue falls rapidly and falls into other receiving bins for subsequent processing.

2. The re-crushing mechanism of a domestic waste incineration slag according to claim 1, characterized in that: The middle parts of the crushing moving body (1) and the crushing stationary body (2) are made of a first wear-resistant, impact-resistant and magnetic isolation material (9), which isolates the upper and lower parts of the crushing moving body (1) and the crushing stationary body (2).

3. The re-crushing mechanism for domestic waste incineration slag according to claim 2, wherein: The upper and lower parts of the crushing moving body (1) and the crushing stationary body (2) are distributed with a second wear-resistant, impact-resistant and magnetic isolation material (10) along their horizontal annular surfaces at intervals. The part between two adjacent second wear-resistant, impact-resistant and magnetic isolation materials (10) is a magnetically conductive metal (11). The first electromagnet (7) and the second electromagnet (8) are arranged behind the magnetically conductive metal (11).

4. A re-crushing mechanism for domestic waste incineration slag according to claim 3, characterized in that: The first wear-resistant, impact-resistant and magnetic isolation material (9) and the second wear-resistant, impact-resistant and magnetic isolation material (10) are silicon nitride ceramics, austenitic stainless steel, tin bronze or tungsten carbide-cobalt alloy; the magnetically conductive metal is silicon steel, cast iron, high manganese steel or a composite structure of the three.

5. The re-crushing mechanism for domestic waste incineration slag according to claim 1, characterized in that: Both ends of the first elastic telescopic sleeve rod (61) are hinged to the rotating shaft (6) and the inner wall of the crushing moving body (1) respectively; multiple first elastic telescopic sleeve rods (61) are divided into two groups and are respectively arranged in the upper and lower parts of the crushing moving body (1); multiple first elastic telescopic sleeve rods (61) in each group are evenly arranged around the rotating shaft (6).

6. The re-crushing mechanism for domestic waste incineration slag according to claim 1, characterized in that: A first bearing plate (12) is supported below the crushing moving body (1); the first bearing plate (12) is connected to the base (14) through multiple second elastic telescopic sleeve rods (13); both ends of the second elastic telescopic sleeve rod (13) are hinged to the first bearing plate (12) and the base (14) respectively.

7. The re-crushing mechanism for domestic waste incineration slag according to claim 1, characterized in that: The rotating shaft (6) is driven to rotate by a first motor (15).

8. A crushing device for domestic waste incineration slag, characterized in that, It includes the re-crushing mechanism of the domestic waste incineration slag according to any one of claims 1 to 7.

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