Asphalt mixture pyrolysis screening grading detector

Abstract

The utility model discloses a kind of asphalt mixture pyrolysis screening grading detection instrument, including feeding device, electromagnetic rotary kiln, discharging device, screening device and metering weighing system;Through the electromagnetic coil winding in electromagnetic rotary kiln in the outer periphery of cylinder, through electromagnetic induction to make cylinder itself heat to heat the material in cylinder, heat energy is directly generated in the inside of cylinder and is transferred to material by conduction, radiation mode, significantly improve heating efficiency and pyrolysis effect;It is also integrated with the initial metering device of material weighing and sintering post-metering device, the weight of material before and after pyrolysis can be automatically metered, combined with the screening result of screening device, the asphalt content and the grading distribution of each level aggregate can be accurately calculated, realize full-process automation detection, greatly improve detection efficiency and accuracy.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment, and in particular to an asphalt mixture pyrolysis sieve grading and distribution testing instrument. Background Technology

[0002] In the construction and maintenance of road engineering, the gradation testing of asphalt mixtures is one of the core links in evaluating the performance of pavement materials and ensuring the quality of the project. Asphalt mixtures are mainly composed of asphalt, coarse aggregate (gravel), fine aggregate (sand), and fillers mixed in a specific ratio. The gradation distribution of the aggregates directly determines the various properties of the asphalt mixture, thereby affecting the load-bearing capacity and service life of the road.

[0003] Gradation testing of asphalt mixtures requires first separating the asphalt from the aggregates, and then performing sieve analysis on the aggregates. Currently, the industry commonly uses high-temperature pyrolysis technology to separate asphalt from aggregates. This involves using a high-temperature environment to cause the asphalt to undergo a pyrolysis reaction, decomposing it into gaseous products that are then discharged, thereby fully exposing the aggregates and creating conditions for subsequent sieve analysis.

[0004] Existing equipment for high-temperature pyrolysis of asphalt mixtures primarily uses electric heating rods to heat the outer surface of the pyrolysis furnace, transferring heat to the asphalt mixture inside the furnace via heat conduction, thereby achieving high-temperature pyrolysis of the asphalt. However, this traditional heating method suffers from numerous drawbacks, including low heating efficiency, long pyrolysis time, and unsatisfactory treatment results, severely impacting the pyrolysis treatment effect and the efficiency and accuracy of gradation testing.

[0005] In the field of asphalt gradation testing, Chinese utility model patent CN223841697U discloses a rapid and intelligent testing device for asphalt mixture gradation, including a vibrating screen, a screen box, a cylinder, and a weighing sensor. Grading is calculated by weighing the asphalt mixture after sieving. However, this type of device can only sieve and weigh already separated aggregates and cannot achieve the pyrolysis separation of asphalt and aggregates. It requires the use of additional pyrolysis equipment, resulting in a complex testing process and low efficiency.

[0006] Therefore, developing an asphalt mixture processing equipment that can solve the above-mentioned technical defects and achieve efficient, uniform, and rapid thermal pyrolysis has become an urgent technical problem to be solved in the field of road engineering testing. Utility Model Content

[0007] The main purpose of this invention is to provide an asphalt mixture pyrolysis sieve grading and testing instrument to solve the technical problems of low heating efficiency and poor effect of existing high-temperature pyrolysis treatment equipment.

[0008] To achieve the above-mentioned utility model objectives, this utility model proposes an asphalt mixture pyrolysis screening and grading analyzer, including a feeding device, an electromagnetic rotary kiln, a discharging device, a screening device, and a metering and weighing system; the electromagnetic rotary kiln includes a cylinder, an electromagnetic induction heating device, and a transmission assembly; the outer periphery of the cylinder is provided with an electromagnetic induction heating device and a transmission assembly for driving the cylinder to rotate; wherein, the electromagnetic induction heating device includes an electromagnetic coil, which is wound around the outer periphery of the cylinder, and the cylinder heats itself through electromagnetic induction to heat the material inside the cylinder;

[0009] The feeding device is connected to the kiln tail end of the cylinder, and the kiln head end of the cylinder is connected to the discharging device. The kiln head end of the cylinder is provided with an exhaust pipe.

[0010] The screening device is connected to the discharge device and is used to screen the pyrolyzed material.

[0011] The metering and weighing system includes an initial metering device located between the feeding device and the electromagnetic rotary kiln, and a post-sintering metering device located between the discharging device and the screening device, for measuring the weight of materials before and after pyrolysis, respectively.

[0012] Furthermore, the electromagnetic induction heating device also includes a side plate assembly and a plurality of fixing strips; the side plate assembly surrounds the outer periphery of the cylinder, the plurality of fixing strips are arranged along the axial direction of the cylinder and attached to the outer wall of the cylinder, and the electromagnetic coil is wound around the outside of the fixing strips.

[0013] Furthermore, it also includes an installation platform; the feeding device, the electromagnetic rotary kiln, the discharging device, and the screening device are all installed on the installation platform; the electromagnetic rotary kiln is installed at an inclination angle of 1.5° to 3° relative to the horizontal plane, so that the material flows from the kiln tail end to the kiln head end under the action of gravity.

[0014] Furthermore, the side plate assembly includes multiple side plates, a side plate fixing plate, and a tie rod. The multiple side plates are arranged opposite to each other and connected by the tie rod. Their relative direction is consistent with the axial direction of the cylinder. One end of each side plate is fixedly connected to the side plate fixing plate, and the side plate fixing plate is fixed to the mounting platform. And / or, a heat insulation layer is also wrapped between the cylinder and the electromagnetic induction heating device, and the heat insulation layer covers the outer peripheral wall of the cylinder.

[0015] Furthermore, the transmission assembly includes a variable frequency electric gearbox, a small sprocket, a chain, a large sprocket, and a large sprocket fixing plate. The small sprocket is connected to the output shaft of the variable frequency electric gearbox, the chain is wound between the small sprocket and the large sprocket, and the large sprocket is fixedly assembled to the outer periphery of the cylinder through the large sprocket fixing plate.

[0016] Furthermore, the cylinder is provided with a guide plate and a lifting plate inside. The guide plate is arranged along the axial direction of the cylinder to guide the material flow to the high-temperature section in the middle of the cylinder. The lifting plate is arranged along the circumference and axial direction of the cylinder to lift the material when the cylinder rotates so as to achieve uniform heating.

[0017] Furthermore, the exhaust pipe is connected to a negative pressure extraction device to extract and discharge the pyrolysis gas generated during the pyrolysis process. The kiln head end of the cylinder is also equipped with a temperature controller to detect the temperature of the material inside the cylinder and feed it back to the control system.

[0018] Furthermore, it also includes an electromagnetic heating control cabinet, wherein the temperature controller, the electromagnetic induction heating device, the transmission assembly, the initial metering device, and the post-sintering metering device are all electrically connected to the electromagnetic heating control cabinet.

[0019] Furthermore, the screening device is a vibrating screen, and the metering and weighing system also includes a multi-specification stone weighing and metering device. The discharge end of the vibrating screen is connected to the multi-specification stone weighing and metering device, which is used to weigh and meter the screened stones of different particle sizes. The multi-specification stone weighing and metering device is electrically connected to the electromagnetic heating control cabinet.

[0020] Furthermore, the outer shell of the cylinder is provided with tires at both the front and rear ends, and at least two sets of symmetrically arranged support roller assemblies are provided below the tires. Each support roller assembly includes a support roller, a support roller shaft, a bearing, and an adjusting base. The support roller is connected to the adjusting base through the support roller shaft, and the tire abuts against the support roller to support the rotation of the cylinder.

[0021] Beneficial effects:

[0022] This invention uses an electromagnetic induction heating rotary kiln to replace the traditional resistance heating rod. The electromagnetic coil is wound around the outer circumference of the cylinder, and the cylinder itself heats up through electromagnetic induction. The heat energy is generated directly inside the cylinder and transferred to the material through conduction and radiation, which significantly improves the heating efficiency and pyrolysis effect.

[0023] This invention includes an initial weighing device and a post-sintering weighing device for materials, which can automatically weigh the materials before and after pyrolysis. Combined with the sieving results of the sieving device, the asphalt content and the gradation distribution of aggregates at each grade can be accurately calculated, realizing fully automated detection and greatly improving detection efficiency and accuracy. Attached Figure Description

[0024] Figure 1 This is a perspective view of an asphalt mixture pyrolysis sieve grading and testing instrument in one embodiment of this utility model;

[0025] Figure 2This is a top view of an asphalt mixture pyrolysis sieve grading and testing instrument in one embodiment of this utility model;

[0026] Figure 3 for Figure 2 Cross-sectional view of the AA surface of the pyrolysis sieve grading and distribution tester for medium-density asphalt mixtures;

[0027] Figure 4 This is a schematic diagram of the structure of an asphalt mixture pyrolysis sieve grading and distribution tester with some parts removed, as an example of one embodiment of this utility model;

[0028] Figure 5 The left view of an asphalt mixture pyrolysis sieve grading and distribution tester with some parts removed is shown in one embodiment of this utility model.

[0029] in:

[0030] 1. Electromagnetic rotary kiln; 11. Kiln body; 111. Kiln head end; 112. Kiln tail end; 113. Exhaust pipe; 114. Guide plate; 115. Lifting plate; 12. Electromagnetic induction heating device; 121. Electromagnetic coil; 122. Side plate assembly; 1221. Side plate; 1222. Side plate fixing plate; 1223. Tie rod; 123. Fixing strip; 13. Transmission assembly; 131. Variable frequency electric gearbox; 132. Small sprocket; 133. Chain; 134. Large sprocket; 135. Large sprocket fixing plate; 14. Tire; 15. Support roller; 16. Support roller shaft; 17. Bearing; 18. Adjusting base;

[0031] 2. Feeding device; 3. Discharging device; 4. Screening device;

[0032] 5. Metering and weighing system; 51. Initial metering device; 52. Post-sintering metering device; 53. Multi-specification stone weighing and metering device;

[0033] 6. Install the platform;

[0034] 7. Electromagnetic heating control cabinet; 71. Temperature controller.

[0035] The realization of the purpose, functional features and advantages of this utility model will be further explained with reference to the accompanying drawings and embodiments. Detailed Implementation

[0036] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0037] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise expressly defined.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] Reference Figure 1-5An embodiment of this utility model provides an asphalt mixture pyrolysis screening and grading analyzer, including a feeding device 2, an electromagnetic rotary kiln 1, a discharging device 3, a screening device 4, and a weighing system 5; the electromagnetic rotary kiln 1 includes a cylinder 11, an electromagnetic induction heating device 12, and a transmission assembly 13; the outer periphery of the cylinder 11 is provided with the electromagnetic induction heating device 12 and the transmission assembly 13 for driving the cylinder 11 to rotate; wherein, the electromagnetic induction heating device 12 includes an electromagnetic coil 121, the electromagnetic coil 121 is wound around the outer periphery of the cylinder 11, and the cylinder 11 heats itself through electromagnetic induction to heat the material inside the cylinder;

[0041] The feeding device 2 is connected to the kiln tail end 112 of the cylinder 11, the kiln head end 111 of the cylinder 11 is connected to the discharging device 3, and the kiln head end 111 of the cylinder 11 is provided with an exhaust pipe 113.

[0042] The screening device 4 is connected to the discharge device 3 and is used to screen the pyrolyzed material.

[0043] The metering and weighing system 5 includes an initial metering device 51 located between the feeding device 2 and the electromagnetic rotary kiln 1, and a post-sintering metering device 52 located between the discharging device 3 and the screening device 4, for measuring the weight of materials before and after pyrolysis respectively.

[0044] This embodiment provides an asphalt mixture pyrolysis sieving and gradation testing instrument, which can be used for high-temperature pyrolysis treatment, sieving analysis, and gradation testing of asphalt mixtures. It is widely used in road construction, asphalt mixture quality testing, and waste asphalt recycling. This equipment combines a feeding device 2, an electromagnetic rotary kiln 1, a discharging device 3, a sieving device 4, and a metering and weighing system 5 to achieve fully automated processing from asphalt mixture input to final gradation data output.

[0045] In this embodiment, the feeding device 2 refers to the feeding system used to transport the asphalt mixture to be tested to the electromagnetic rotary kiln 1, which typically includes components such as a feeding pipe, a feeder, a hopper, a conveyor belt or a screw conveyor.

[0046] In this embodiment, the electromagnetic rotary kiln 1 comprises three core parts: a cylinder 11, an electromagnetic induction heating device 12, and a transmission assembly 13. The cylinder 11 is a sealed space for the pyrolysis reaction of materials, typically made of high-temperature resistant stainless steel, capable of withstanding high temperatures while ensuring sufficient magnetic and thermal conductivity. The electromagnetic induction heating device 12 is the core heating element of the electromagnetic rotary kiln 1, its working principle based on Faraday's law of electromagnetic induction and the Joule heating effect. An electromagnetic coil 121 is wound around the outer circumference of the cylinder 11. When high-frequency alternating current passes through the coil, it generates a rapidly changing alternating magnetic field in the surrounding space. This magnetic field penetrates the cylinder 11 and induces a closed-loop current inside the cylinder 11. The current generates Joule heat due to the resistance of the metal material, causing the cylinder 11 to heat up rapidly. Compared to traditional resistance heating rods, electromagnetic induction heating achieves a thermal efficiency of over 90%, a heating rate 3-5 times faster than traditional methods, and a temperature control accuracy of ±1℃. The heating power of the electromagnetic induction heating device 12 can be matched to the size of the cylinder 11 and the pyrolysis capacity.

[0047] In this embodiment, the transmission assembly 13 is a power system that drives the cylinder 11 to rotate. Its function is to make the material inside the cylinder 11 continuously tumble, be heated evenly, and control the residence time of the material inside the cylinder.

[0048] In this embodiment, the discharge device 3 refers to the discharge system that discharges the pyrolyzed material from the kiln head end 111 of the electromagnetic rotary kiln 1 and transports it to the subsequent screening device 4. It typically includes components such as a kiln head hood, a discharge chute, a screw conveyor, or a belt conveyor. The kiln head hood is installed at the kiln head end 111 of the cylinder 11 and serves to seal, insulate, and guide the material.

[0049] Understandably, the design of the discharge device 3 needs to take into account the cooling and conveying of high-temperature materials. For example, a water-cooled jacket or air-cooled device can be installed to cool the kiln head hood, so as to prevent high-temperature materials from directly entering the screening device 4 and causing the screen to deform or be damaged.

[0050] In this embodiment, the screening device 4 refers to the device for particle size classification and screening of the pyrolyzed aggregate. Its function is to separate aggregates of different particle sizes and provide basic data for subsequent gradation analysis.

[0051] In this embodiment, the metering and weighing system 5 accurately calculates the asphalt content and gradation distribution by measuring the weight of materials before and after pyrolysis. The metering and weighing system 5 includes an initial metering device 51 and a post-sintering metering device 52. The initial metering device 51 and / or the post-sintering metering device 52 can be a weighing sensor or a balance.

[0052] It is easy to understand that the initial metering device 51 is located between the feeding device 2 and the electromagnetic rotary kiln 1, and is used to weigh the asphalt mixture before it is fed into the rotary kiln. The working process of the initial metering device 51 is as follows: the asphalt mixture enters the weighing hopper through the feeding device 2. When the material in the hopper reaches the set weight, the weighing sensor outputs a weight signal, which is amplified and filtered by the signal conditioning circuit and then transmitted to the data acquisition unit. The data acquisition unit records the initial weight W1, and then opens the valve at the bottom of the hopper, allowing the material to enter the electromagnetic rotary kiln 1.

[0053] Similarly, the post-sintering metering device 52 is located between the discharge device 3 and the screening device 4, and is used to weigh the pyrolyzed aggregate. The working process of the post-sintering metering device 52 is as follows: the pyrolyzed aggregate is discharged from the electromagnetic rotary kiln 1 and enters the weighing hopper. When the material in the hopper reaches a stable state, the weighing sensor outputs a weight signal, the data acquisition unit records the sintered weight W2, and then the valve at the bottom of the hopper is opened, and the material enters the screening device 4. By comparing W1 and W2, the asphalt content can be calculated: asphalt content = (W1-W2) / W1×100%. The metering and weighing system 5 is electrically connected to the electromagnetic heating control cabinet 7, and the weighing data is fed back to the control cabinet in real time. The control cabinet can automatically adjust the heating power or the rotation speed of the cylinder 11 according to the change in asphalt content to achieve closed-loop control.

[0054] The implementation process of this embodiment is as follows: First, the asphalt mixture to be tested is conveyed to the initial metering device 51 through the feeding device 2. The weighing device records the initial weight W1, and then the material enters the kiln tail end 112 of the electromagnetic rotary kiln 1. At this time, the electromagnetic induction heating device 12 has been started, the cylinder 11 is heated, and the frequency conversion electric reduction gearbox 131 drives the cylinder 11 to rotate at a certain speed. After the material enters the cylinder 11, it flows from the kiln tail end 112 to the kiln head end 111 under the action of the inclined angle, and at the same time, it is tumbled due to the rotation of the cylinder 11 to achieve uniform heating. Under the action of high temperature, the asphalt undergoes a pyrolysis reaction and decomposes into cracked gas and aggregate. The cracked gas is extracted and purified by the negative pressure extraction device through the exhaust pipe 113 and then discharged. The residence time of the material in the cylinder is about 4 to 5 minutes, which is sufficient to completely separate the asphalt from the aggregate. The pyrolyzed aggregate is discharged from the kiln head end 111 and enters the sintering metering device 52. The weighing device records the sintered weight W2 and calculates the asphalt content. Then, the aggregate enters the screening device 4 for screening. The screening device 4 is equipped with multiple layers of screens with progressively smaller screen sizes, resulting in aggregates of corresponding particle size ranges after screening. The screened aggregates then enter the multi-specification stone weighing and metering device 53, where they are weighed to obtain the weight distribution of each particle size range. Combining the initial weight and the weight after sintering, the mass percentage of each aggregate grade can be calculated, forming a complete gradation curve. Finally, all data (initial weight, weight after sintering, asphalt content, weight and percentage of each aggregate grade) are displayed on the screen of the electromagnetic heating control cabinet 7, and a test report can be generated.

[0055] In one embodiment, the electromagnetic induction heating device 12 further includes a side plate assembly 122 and a plurality of fixing strips 123; the side plate assembly 122 surrounds the outer periphery of the cylinder 11, the plurality of fixing strips 123 are arranged along the axial direction of the cylinder 11 and attached to the outer wall of the cylinder 11, and the electromagnetic coil 121 is wound around the outside of the fixing strips 123.

[0056] In one embodiment, the asphalt mixture pyrolysis screening and grading analyzer also includes an installation platform 6; the feeding device 2, the electromagnetic rotary kiln 1, the discharging device 3 and the screening device 4 are all installed on the installation platform 6; the electromagnetic rotary kiln 1 is installed at an inclination angle of 1.5° to 3° relative to the horizontal plane, so that the material flows from the kiln tail end 112 to the kiln head end 111 under the action of gravity.

[0057] In this embodiment, the mounting platform 6 is a steel structure foundation platform supporting the entire testing instrument. Its function is to uniformly install the feeding device 2, electromagnetic rotary kiln 1, discharging device 3, and screening device 4 on the same plane, ensuring the relative position stability between the components and avoiding positional shifts caused by uneven ground or equipment vibration. The cylinder 11 is installed at an inclination angle of 1.5° to 3°, with the kiln tail end 112 being higher and the kiln head end 111 being lower, allowing the material to flow from the kiln tail end 112 to the kiln head end 111 under the action of gravity. The specific implementation of the inclination installation is as follows: two sets of supports with a height difference of H are set on the mounting platform 6, with the support at the kiln tail end 112 being higher and the support at the kiln head end 111 being lower. The inclination angle θ is achieved by adjusting the height difference between the two sets of supports. The relationship between the height difference H, the inclination angle θ, and the length L of the cylinder 11 is: H = L × tanθ.

[0058] The tilt angle is set based on considerations of material flowability and pyrolysis time. An angle that is too small, such as less than 1°, will result in slow material flow and excessive residence time, potentially leading to excessive oxidation of the aggregate. An angle that is too large, such as greater than 5°, will result in excessively fast material flow and incomplete pyrolysis. Preferably, the tilt angle is 2°. A 2° tilt angle allows the residence time of the material in the cylinder 11 to be controlled within 4 to 5 minutes, ensuring complete pyrolysis of the asphalt while avoiding excessive oxidation of the aggregate, and also resulting in high production efficiency.

[0059] By installing the equipment at an angle, the material flows automatically from the kiln tail end 112 to the kiln head end 111 under the influence of gravity, eliminating the need for additional conveying devices, simplifying the equipment structure, and reducing energy consumption and maintenance costs. In another embodiment, a device such as a screw conveyor can also be installed to push the material from the kiln tail end 112 to the kiln head end 111.

[0060] In one embodiment, the side plate assembly 122 includes a plurality of side plates 1221, a side plate fixing plate 1222, and a tie rod 1223. The plurality of side plates 1221 are arranged opposite to each other and connected by the tie rod 1223. Their relative directions are consistent with the axial direction of the cylinder 11. One end of each side plate 1221 is fixedly connected to the side plate fixing plate 1222, and the side plate fixing plate 1222 is fixed on the mounting platform 6. And / or, a heat insulation layer is also wrapped between the cylinder 11 and the electromagnetic induction heating device 12, and the heat insulation layer covers the outer peripheral wall of the cylinder 11.

[0061] In this embodiment, the side plate assembly 122 is the supporting frame of the electromagnetic induction heating device 12, mainly surrounding the outer periphery of the cylinder 11, supporting the electromagnetic coil 121 and the fixing bar 123, and ensuring the overall stability and rigidity of the electromagnetic induction heating device 12. The side plate 1221 is a vertically arranged plate structure, its function being to connect the side plate fixing plate 1222 and the tie rod 1223 to form a frame structure; the upper and lower ends of the side plate 1221 are typically provided with connecting holes for connecting to the side plate fixing plate 1222 and the tie rod 1223. The side plate fixing plate 1222 is a plate-shaped structure that connects the side plate 1221 to the mounting platform 6. Its function is to fix the side plate assembly 122 on the mounting platform 6 and to serve as the fixing end of the tie rod 1223. The tie rod 1223 is a longitudinal rod-shaped structure that connects the left and right side plates 1221. Its function is to tighten the left and right side plates 1221 to form a rigid frame and allow thermal expansion. The two ends of the tie rod 1223 are threaded and fitted with nuts and washers to tighten the side plates 1221.

[0062] On the one hand, since the cylinder 11 operates at temperatures as high as 800℃, resulting in significant thermal expansion, the side plate assembly 122 allows for free thermal expansion of the cylinder 11, preventing thermal stress from causing frame deformation or cracking. The tie rod 1223 is designed with one end fixed and the other end adjustable; that is, one end of the tie rod 1223 is fixed to the side plate 1221, and the other end is connected by threads and nuts, leaving a thermal expansion gap. When the cylinder 11 expands due to heat, the tie rod 1223 can adaptively expand and contract, avoiding thermal stress concentration. On the other hand, the side plate 1221 and the tie rod 1223 are typically made of non-magnetic or low-magnetic-permeability materials to reduce eddy current losses.

[0063] In the above embodiment or another embodiment example, the outer periphery of the cylinder 11 is also wrapped with a heat insulation layer. The heat insulation layer is a heat insulation material covering the outer periphery of the cylinder 11. Its function is to improve thermal efficiency, reduce the heat loss from the electromagnetic induction heating device 12, and protect the electromagnetic coil 121 and the side plate assembly 122 from high temperature radiation damage.

[0064] In one embodiment, the transmission assembly 13 includes a variable frequency electric reduction gearbox 131, a small sprocket 132, a chain 133, a large sprocket 134, and a large sprocket fixing plate 135. The small sprocket 132 is connected to the output shaft of the variable frequency electric reduction gearbox 131. The chain 133 is wound between the small sprocket 132 and the large sprocket 134. The large sprocket 134 is fixedly mounted to the outer periphery of the cylinder 11 through the large sprocket fixing plate 135.

[0065] In this embodiment, the rotational speed of the cylinder 11 is infinitely adjustable via a variable frequency electric reducer 131, allowing for flexible adjustment based on material properties and pyrolysis temperature to ensure optimal pyrolysis performance. The output shaft of the variable frequency electric reducer 131 is connected to a small sprocket 132, which drives a large sprocket 134 fixed to the outer circumference of the cylinder 11 via a chain 133, thereby driving the cylinder 11 to rotate. The advantages of chain drive 133 are smooth transmission, high load-bearing capacity, and convenient maintenance, making it suitable for low-speed, heavy-load conditions like those in rotary kilns.

[0066] In this embodiment, the large sprocket fixing plate 135 is a connecting component that connects the large sprocket 134 and the cylinder 11. It is fixed to the outer circumference of the cylinder 11 by welding or bolting and plays the role of transmitting torque. The large sprocket fixing plate 135 is usually an annular steel plate, with its outer diameter matching the inner diameter of the large sprocket 134 and its inner diameter matching the outer diameter of the cylinder 11.

[0067] In one embodiment, the cylinder 11 is provided with a guide plate 114 and a lifting plate 115 inside. The guide plate 114 is arranged along the axial direction of the cylinder 11 to guide the material flow to the high-temperature section in the middle of the cylinder 11. The lifting plate 115 is arranged along the circumference and axial direction of the cylinder 11 to lift the material when the cylinder 11 rotates so as to achieve uniform heating.

[0068] In this embodiment, the guide plate 114 is an annular or elongated plate structure arranged along the axial direction of the cylinder 11, which guides the material to flow quickly from the kiln tail end 112 to the high-temperature section in the middle of the cylinder 11, shortening the time for the material to enter the high-temperature zone and improving the pyrolysis efficiency. The cross-sectional shape of the guide plate 114 is usually flat or arc-shaped. The arc-shaped guide plate 114 can better fit the inner wall of the cylinder 11 and reduce material retention. Two to four guide plates 114 are provided and evenly distributed along the inner wall of the cylinder 11.

[0069] In this embodiment, the lifting plates 115 are plate-shaped or bucket-shaped structures arranged circumferentially and axially along the cylinder 11. Their function is to lift and tumble the material when the cylinder 11 rotates, so that the material is heated evenly and to prevent the material from sticking to the cylinder wall and forming dead zones. Preferably, the lifting plates 115 are welded to the middle and front of the cylinder 11, arranged in 2 to 3 rows axially, and the lifting plates 115 are inclined at 15-20° relative to the radial direction.

[0070] In this embodiment, after the material enters the cylinder 11 from the kiln tail end 112, it first encounters the guide plate 114. The guide plate 114 quickly guides the material to the middle high-temperature section area, reducing the residence time of the material in the low-temperature preheating zone. After the material reaches the middle high-temperature section, the lifting plate 115 continuously lifts and tumbles the material under the action of the rotation of the cylinder 11, so that the material particles are fully exposed to the high-temperature environment, avoiding the material from sticking to the cylinder wall and forming local overheating, and reducing the risk of coking and blockage inside the cylinder.

[0071] Understandably, during the descent, the material moves along the axial direction of the cylinder 11 under the influence of gravity, forming a spiral trajectory. This not only prolongs the residence time of the material but also prevents it from accumulating inside the cylinder. In summary, the guide plate 114 and the lifting plate 115 work together to control the flow path and heating state of the material, ensuring that the material is fully heated in the high-temperature area and avoiding local overheating or underheating.

[0072] In one embodiment, the exhaust pipe 113 is connected to a negative pressure extraction device for extracting and discharging the pyrolysis gas generated during the pyrolysis process, and the kiln head end 111 of the cylinder 11 is also equipped with a temperature controller for detecting the temperature of the material inside the cylinder.

[0073] In this embodiment, the exhaust pipe 113 is installed on the top or side of the kiln head hood, and the outlet is connected to a gas purification device or a direct exhaust chimney. The pyrolysis gas generated inside the cylinder 11 is extracted and discharged by the negative pressure extraction device. The negative pressure extraction device can maintain a negative pressure environment inside the cylinder, avoid the accumulation of pyrolysis gas leading to pressure increase, which would affect the pyrolysis reaction, and at the same time prevent the pyrolysis gas from escaping and causing environmental pollution and safety hazards.

[0074] In this embodiment, the temperature controller includes a thermocouple or an infrared thermometer, which is a sensor system used to monitor the temperature of the material inside the cylinder 11, thereby achieving precise temperature control. The temperature controller is installed at the kiln head end 111 of the cylinder 11, where the temperature is closest to the actual pyrolysis temperature of the material, resulting in the most accurate measurement data.

[0075] In one embodiment, the asphalt mixture pyrolysis screening and grading analyzer further includes an electromagnetic heating control cabinet 7, wherein the temperature controller, the electromagnetic induction heating device 12, the transmission assembly 13, the initial metering device 51, and the sintering metering device 52 are all electrically connected to the electromagnetic heating control cabinet 7.

[0076] In this embodiment, the electromagnetic heating control cabinets 7 of each device are electrically connected, and can feed back various test data to the electromagnetic heating control cabinets 7 in real time. Through the centralized control of the electromagnetic heating control cabinets 7, the coordinated operation and intelligent management of each component are realized. The equipment has a high level of automation, is easy to operate, and reduces labor costs and operational difficulty.

[0077] In one embodiment, the screening device 4 is a vibrating screen, and the weighing system 5 further includes a multi-specification stone weighing and metering device 53. The discharge end of the vibrating screen is connected to the multi-specification stone weighing and metering device 53, which is used to weigh and meter the screened stones of different particle sizes. The multi-specification stone weighing and metering device 53 is electrically connected to the electromagnetic heating control cabinet 7.

[0078] In this embodiment, the vibrating screener generates high-frequency vibration through a vibrating motor, causing the material on the screen to reciprocate. Material smaller than the screen aperture passes through the screen, while material larger than the screen aperture is retained on the screen, thereby achieving particle size classification.

[0079] In this embodiment, the multi-size aggregate weighing and metering device 53 is a metering system that weighs aggregates of different particle sizes separately. Its function is to accurately measure the weight of aggregates in each particle size range, and calculate the asphalt content and gradation distribution by combining the initial material weighing and the sintered material weighing data. The multi-size aggregate weighing and metering device 53 may include multiple independent weighing hoppers (the number of weighing hoppers is consistent with the number of screen layers of the screening machine), weighing sensors, data acquisition units, hopper valves, and discharge chutes, etc.

[0080] Weighing hoppers are typically arranged in series or in parallel. In series, the hoppers are arranged sequentially, with aggregate flowing from the first hopper into the second, and so on. In parallel, the hoppers are arranged side by side, with the screened aggregate flowing into their respective hoppers. In this embodiment, a series arrangement is preferred due to its compact structure and small footprint.

[0081] The load cell is typically a resistance strain gauge sensor or a piezoelectric sensor to ensure accurate weighing; the hopper valve is typically a pneumatic or electric butterfly valve or a slide gate valve to control the discharge of material from the hopper; the data acquisition unit ensures real-time acquisition of weight data; and the discharge chute discharges the weighed aggregate to an external container.

[0082] In this embodiment, the high-efficiency screening of the vibrating screen and the weighing and metering device 53 for multiple specifications of stone aggregates weigh each size separately, and the weight data is fed back to the electromagnetic heating control cabinet 7 in real time, the screening and weighing process is automated and no manual intervention is required, which improves the detection efficiency and operation convenience.

[0083] In one embodiment, the outer shell of the cylinder 11 is provided with a tire 14 at both the front and rear ends. At least two sets of symmetrically arranged support roller assemblies are provided below the tire 14. The support roller assembly includes a support roller 15, a support roller shaft 16, a bearing 17 and an adjusting base 18. The support roller 15 is connected to the adjusting base 18 through the support roller shaft 16. The tire 14 abuts against the support roller 15 to support the rotation of the cylinder 11.

[0084] In this embodiment, the tire 14 and the roller assembly are key components that support the rotation of the cylinder 11. Their function is to bear the entire weight of the cylinder 11, the material and the electromagnetic induction heating device 12, to ensure that the cylinder 11 rotates smoothly and has good concentricity, to avoid deformation and vibration of the cylinder 11, and to extend the service life of the equipment.

[0085] Specifically, the tire 14 is an annular steel ring installed at the front and rear ends of the outer shell of the cylinder 11. Its function is to transfer the weight of the cylinder 11 to the roller assembly and to serve as the track for the rotation of the cylinder 11. The roller assembly is a device that supports the tire 14 and allows the cylinder 11 to rotate. Its function is to bear the weight transmitted by the tire 14 and to serve as a rotation support point. The roller 15 is a rotating component that directly contacts the tire 14. The roller shaft 16 is a shaft that supports the rotation of the roller 15. The bearing 17 has a strong load-bearing capacity and can withstand a large radial load. The adjusting base 18 is a component that adjusts the position and height of the roller 15, and is used to adjust the horizontal and vertical position of the roller 15 to ensure good contact between the roller 15 and the tire 14.

[0086] Preferably, the number of roller assemblies is 4 to 8, that is, 2 to 4 sets of symmetrically arranged roller assemblies are provided below the tire 14, and each set of roller assemblies includes 2 rollers 15, which are symmetrically arranged on the left and right sides along the axis of the cylinder 11. For example, when 2 sets of roller assemblies are used, 4 rollers 15 are provided below the tire 14, respectively located on the left and right sides of the axis of the cylinder 11, forming a V-shaped support to ensure the stability of the cylinder 11.

[0087] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. An asphalt mixture pyrolysis sieve grading and distribution testing instrument, characterized in that, It includes a feeding device, an electromagnetic rotary kiln, a discharging device, a screening device, and a metering and weighing system; The electromagnetic rotary kiln includes a cylinder, an electromagnetic induction heating device, and a transmission assembly; the outer periphery of the cylinder is provided with an electromagnetic induction heating device and a transmission assembly that drives the cylinder to rotate; wherein, the electromagnetic induction heating device includes an electromagnetic coil, which is wound around the outer periphery of the cylinder, and the cylinder heats itself through electromagnetic induction to heat the material inside the cylinder; The feeding device is connected to the kiln tail end of the cylinder, and the kiln head end of the cylinder is connected to the discharging device. The kiln head end of the cylinder is provided with an exhaust pipe. The screening device is connected to the discharge device and is used to screen the pyrolyzed material. The metering and weighing system includes an initial metering device located between the feeding device and the electromagnetic rotary kiln, and a post-sintering metering device located between the discharging device and the screening device, for measuring the weight of materials before and after pyrolysis, respectively.

2. The asphalt mixture pyrolysis sieve grading and distribution analyzer according to claim 1, characterized in that, The electromagnetic induction heating device also includes a side plate assembly and multiple fixing strips; the side plate assembly surrounds the outer periphery of the cylinder, the multiple fixing strips are arranged along the axial direction of the cylinder and attached to the outer wall of the cylinder, and the electromagnetic coil is wound around the outside of the fixing strips.

3. The asphalt mixture pyrolysis sieve grading and distribution analyzer according to claim 2, characterized in that, It also includes an installation platform; the feeding device, the electromagnetic rotary kiln, the discharging device and the screening device are all installed on the installation platform; the electromagnetic rotary kiln is installed at an inclination angle of 1.5° to 3° relative to the horizontal plane, so that the material flows from the kiln tail end to the kiln head end under the action of gravity.

4. The asphalt mixture pyrolysis sieve grading and distribution analyzer according to claim 3, characterized in that, The side plate assembly includes multiple side plates, a side plate fixing plate, and a tie rod. The multiple side plates are arranged opposite each other and connected by the tie rod. Their relative direction is consistent with the axial direction of the cylinder. One end of each side plate is fixedly connected to the side plate fixing plate, which is fixed to the mounting platform. And / or, a heat insulation layer is also wrapped between the cylinder and the electromagnetic induction heating device. The heat insulation layer covers the outer peripheral wall of the cylinder.

5. The asphalt mixture pyrolysis sieve grading and distribution analyzer according to claim 1, characterized in that, The transmission assembly includes a variable frequency electric gearbox, a small sprocket, a chain, a large sprocket, and a large sprocket fixing plate. The small sprocket is connected to the output shaft of the variable frequency electric gearbox. The chain is wound between the small sprocket and the large sprocket. The large sprocket is fixedly assembled to the outer periphery of the cylinder through the large sprocket fixing plate.

6. The asphalt mixture pyrolysis sieve grading and distribution analyzer according to claim 1, characterized in that, The cylinder is equipped with a guide plate and a lifting plate. The guide plate is arranged along the axial direction of the cylinder to guide the material flow to the high-temperature section in the middle of the cylinder. The lifting plate is arranged along the circumference and axial direction of the cylinder to lift the material when the cylinder rotates to achieve uniform heating.

7. The asphalt mixture pyrolysis sieve grading and distribution analyzer according to claim 1, characterized in that, The exhaust pipe is connected to a negative pressure extraction device to extract and discharge the pyrolysis gas generated during the pyrolysis process. The kiln head end of the cylinder is also equipped with a temperature controller to detect the temperature of the material inside the cylinder.

8. The asphalt mixture pyrolysis sieve grading and distribution analyzer according to claim 7, characterized in that, It also includes an electromagnetic heating control cabinet, wherein the temperature controller, the electromagnetic induction heating device, the transmission assembly, the initial metering device, and the post-sintering metering device are all electrically connected to the electromagnetic heating control cabinet.

9. The asphalt mixture pyrolysis sieve grading and distribution analyzer according to claim 8, characterized in that, The screening device is a vibrating screen, and the metering and weighing system also includes a multi-specification stone weighing and metering device. The discharge end of the vibrating screen is connected to the multi-specification stone weighing and metering device, which is used to weigh and meter the screened stones of different particle sizes. The multi-specification stone weighing and metering device is electrically connected to the electromagnetic heating control cabinet.

10. The asphalt mixture pyrolysis sieve grading and distribution analyzer according to claim 1, characterized in that, The outer shell of the cylinder is provided with tires at both the front and rear ends. At least two sets of symmetrically arranged support roller assemblies are provided below the tires. Each support roller assembly includes a support roller, a support roller shaft, a bearing, and an adjusting base. The support roller is connected to the adjusting base through the support roller shaft. The tires abut against the support rollers to support the rotation of the cylinder.

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