A cooling and anti-sticking system for granulation of solid waste composite asphalt modifiers

Abstract

This invention provides a cooling and anti-sticking system for granulation of solid waste composite asphalt modifiers. Located below the material drop zone of the pelletizing mechanism in the pelletizing device, it includes: a stepped mesh belt composed of multiple overlapping, breathable conveyor chains with a gravity drop height difference between adjacent chains; multiple flexible toothed rollers with their axes spanning above the stepped mesh belt and perpendicular to its running direction; and a blowing device located below the stepped mesh belt. Through the multi-stage drop and tumbling structure of the stepped mesh belt below the material drop zone, the multiple flexible toothed rollers spanning above the stepped mesh belt comb and disperse the particle layer, while the blowing device below the stepped mesh belt blows out airflow for cooling. This three-stage synergistic structure achieves rapid cooling and anti-sticking of the particles without the use of water cooling, effectively avoiding the clumping and moisture absorption problems caused by residual moisture in traditional water cooling processes.

Description

Technical Field

[0001] This utility model relates to the field of road engineering material preparation technology, specifically to a cooling and anti-sticking system for granulation of solid waste composite asphalt modifier. Background Technology

[0002] With the continuous development of solid waste resource utilization technology, applying industrial solid waste materials such as coal chemical solid waste and mineral solid waste to the preparation of asphalt modifiers has become an important technical approach for achieving high-value utilization of solid waste and improving the performance of pavement materials in the road engineering field. In the industrial production of high-viscosity asphalt modifiers, existing molding equipment and processes have formed a relatively mature application system. Typical production devices often adopt a process flow of twin-screw and single-screw series extrusion, underwater pelletizing by pelletizing car, water tank cooling, centrifugal dehydration combined with wind drying and screening, which can realize the granulation preparation of conventional asphalt modifiers and meet the needs of basic road paving.

[0003] However, solid waste powder and asphalt modification components differ significantly in physical properties. Solid waste powder is characterized by easy moisture absorption, easy bridging, and high abrasiveness, while asphalt materials have high viscosity and strong temperature sensitivity. The mixture formed by the combination of the two has even more unique physical properties. Existing production equipment has many technical problems in the cooling stage: existing technology uses high-pressure water to directly wash the material during pelleting and cooling, and adopts water tank cooling. Since solid waste powder is extremely easy to absorb water, this water contact method will cause the powder to absorb moisture and degenerate. Even if a lengthy centrifugal dehydration and cyclone drying process is added later, it is difficult to completely remove microscopic moisture. This makes the freshly cut initial particles very easy to stick together and form huge, unusable lumps in the silo, losing their dispersibility in road engineering. Utility Model Content

[0004] This invention provides a cooling and anti-sticking system for granulation of solid waste composite asphalt modifiers, in order to solve the problem that high-viscosity composite materials containing hygroscopic components are prone to moisture absorption and deterioration underwater.

[0005] To address the aforementioned problems, this utility model provides a cooling and anti-sticking system for granulation of solid waste composite asphalt modifiers. Located below the material drop zone of the pelletizing mechanism in the granulation device, the system includes: a stepped mesh belt composed of multiple overlapping, breathable conveyor chains with a gravity drop height difference between adjacent conveyor chains; multiple flexible comb rollers with their axes spanning above the stepped mesh belt and perpendicular to its running direction; and a blowing device located below the stepped mesh belt.

[0006] This technical solution utilizes a multi-stage drop and tumbling structure of a stepped mesh belt located below the pelletizing mechanism's feeding area. This ensures that the pellets are evenly exposed to the cooling airflow on all sides, while the tumbling friction between the pellets helps separate slightly sticky particles. Multiple flexible comb rollers positioned across the stepped mesh belt comb and disperse the particle layer, forcibly separating sticky particle clusters. An air blowing device located below the stepped mesh belt blows airflow, allowing the particles to be cooled by the airflow while suspended. This three-stage synergistic structure achieves rapid cooling and anti-sticking of the particles without the use of water cooling, effectively avoiding the clumping and moisture absorption problems caused by residual moisture in traditional water cooling processes.

[0007] Furthermore, the flexible comb roller surface is evenly distributed with flexible comb teeth, and there is a gap between the end of the comb teeth and the surface of the stepped mesh belt.

[0008] Furthermore, the comb teeth are made of silicone or nylon.

[0009] Furthermore, the flexible comb roller is driven by a drive motor mounted on the stepped mesh belt frame, and the direction of the rotational linear velocity of the flexible comb roller is the same as or opposite to the conveying direction of the stepped mesh belt.

[0010] Furthermore, the blowing device includes a wind box located on the ground and a pulse control valve located on the air inlet duct of the wind box.

[0011] Furthermore, multiple air outlets are evenly distributed on the top of the bellows.

[0012] Furthermore, the blowing device also includes a cooler connected to the air box.

[0013] Furthermore, the cooling and anti-sticking system also includes a powder spreader installed on the first feeding end of the stepped mesh belt via a bracket, with the discharge direction of the spreading port at the bottom of the powder spreader biased towards the initial falling direction of the particles.

[0014] Furthermore, the powder spreader includes a storage hopper and a metering valve located at the bottom of the storage hopper.

[0015] Furthermore, the mesh size of the conveyor belt is 0.5mm to 2mm.

[0016] The technical advantages of this application are as follows:

[0017] This application achieves rapid and uniform cooling and effective anti-sticking of particles without water contact through the synergistic effect of three mechanisms: the tumbling and rolling of the stepped mesh belt, the combing and dispersing by multiple flexible toothed rollers, and the airflow cooling by a blowing device. The stepped mesh belt utilizes gravity to tumble the particles, ensuring uniform cooling on all sides; multiple flexible toothed rollers positioned above the mesh belt forcibly separate adhering particle clusters without damaging the particles; and the blowing device located below the mesh belt allows airflow to pass through the breathable mesh belt for all-around cooling of the particles. This three-stage synergistic cooling and anti-sticking mechanism effectively prevents the solid waste compound material from absorbing large amounts of water, effectively solving the problems of powder moisture absorption and particle adhesion and agglomeration caused by underwater pelletizing and cooling. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the cooling and anti-sticking system provided by this utility model.

[0019] Figure 2 This is a front view structural diagram of the cooling and anti-sticking system provided by this utility model.

[0020] Figure 3 This utility model provides Figure 2 A magnified view of the details at point A in the middle.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1000, Pelletizing mechanism;

[0023] 100. Stepped mesh belt; 110. Conveyor chain; 120. Driven roller; 130. Driven roller; 140. Frame;

[0024] 200. Powder spreader; 210. Material storage hopper; 220. Quantitative feed valve; 230. Support; 240. Spreading port;

[0025] 300. Flexible comb roller; 310. Comb teeth; 320. Drive motor;

[0026] 400. Blowing device; 410. Air box; 420. Pulse control valve; 430. Air cooler; 440. Air outlet. Detailed Implementation

[0027] The following will be combined with the appendix Figures 1-3 The embodiments of the technical solution of this application are described in detail below. The following embodiments are only used to illustrate the technical solution of this application more clearly, and are therefore only examples and should not be used to limit the scope of protection of this application.

[0028] Reference Figure 1 and Figure 2This utility model discloses a cooling and anti-sticking system for granulation of solid waste composite asphalt modifier. It is located below the material discharge area of ​​the pelletizing mechanism 1000 in the pelletizing device, and is used for dry cooling and anti-sticking treatment of the hot pellets after pelletizing. The cooling and anti-sticking system includes a stepped mesh belt 100, a flexible comb roller 300, and a blowing device 400.

[0029] The stepped mesh belt 100 is composed of multiple levels of breathable conveyor mesh chains 110 that overlap end to end, with a gravity drop height difference between adjacent levels of conveyor mesh chains 110; multiple flexible comb rollers 300 with their axes horizontally spanning above the stepped mesh belt 100 and perpendicular to the running direction of the stepped mesh belt 100; and a blowing device 400 located below the stepped mesh belt 100.

[0030] By setting up a stepped mesh belt 100, a flexible comb roller 300, and a blowing device 400, the particles undergo a synergistic effect of falling, rolling, combing, and blowing, achieving rapid and uniform cooling and effective anti-sticking of the particles in dry granulation. This solves the problems of clumping and moisture absorption and deterioration caused by residual moisture in traditional water cooling processes.

[0031] The stepped conveyor belt 100 consists of multiple stages of breathable conveyor chains 110 that overlap at both ends. Specifically, each stage of the conveyor chain 110 is wound around a corresponding drive roller 120 and driven roller 130, and is driven by the drive roller 120. Between two adjacent stages of the conveyor chain 110, the discharge end of the upper stage and the feed end of the lower stage overlap at both ends in the horizontal direction, with an overlap length of 1 / 5 to 1 / 3 of the length of the upper stage. The discharge end of the upper stage is higher than the feed end of the lower stage, creating a gravity drop height difference between them. The stepped conveyor belt 100 preferably has 2 to 5 stages. The preferred gravity drop height difference between two adjacent conveyor belts 110 is 50mm to 150mm. Within this range, the particles can tumble sufficiently during the fall, ensuring even exposure of all surfaces to the cooling airflow. When the drop height difference is less than 50mm, the particles do not tumble sufficiently, resulting in reduced cooling uniformity. When the drop height difference is greater than 150mm, the impact of the falling particles is too great, easily causing particle breakage. Each level of the conveyor belt 110 is supported and fixed by a frame 140 installed on the ground or platform. The conveyor belt 110 uses a stainless steel woven wire mesh chain or a stainless steel perforated mesh chain with a mesh size of 0.5mm to 2mm, allowing the cooling airflow to pass through the mesh belt from bottom to top for all-around cooling of the particles.

[0032] After pelleting, the pellets fall onto the first-stage conveyor belt of the stepped mesh belt 100 and are conveyed forward with the belt. As the pellets fall from the discharge end of the previous conveyor belt to the feed end of the next conveyor belt, they tumble during the gravity fall, ensuring that all sides of the pellets are evenly exposed to the cooling airflow. Simultaneously, the tumbling friction between the pellets helps separate slightly sticky pellets. This combination of falling and tumbling with permeable air cooling achieves rapid cooling and anti-sticking of the pellets without contact with water, avoiding the clumping problem caused by residual moisture in traditional water cooling processes.

[0033] Multiple flexible toothed rollers 300 are arranged across the stepped mesh belt 100, with the axis of the flexible toothed rollers 300 perpendicular to the running direction of the stepped mesh belt 100. The two ends of the flexible toothed rollers 300 are respectively mounted on the frames 140 on both sides of the stepped mesh belt 100 via bearing seats. The number of flexible toothed rollers 300 is half the number of stages of the stepped mesh belt 100, with at least one flexible toothed roller 300 positioned above every two adjacent conveyor chains 110. The flexible toothed roller 300 is a cylindrical roller body with flexible toothed rollers 310 evenly distributed on its surface, spaced apart along the axial and circumferential directions of the roller body. A gap is provided between the end of the toothed roller 310 and the surface of the conveyor chain 110 of the stepped mesh belt 100. The gap height is preferably 1 to 2 times the diameter of the granulated particles. Within this range, the toothed rollers 310 can effectively comb the particle layer without causing particles to get stuck due to excessively small gaps or failing to comb due to excessively large gaps. The comb teeth 310 are made of silicone or nylon, which has sufficient flexibility and wear resistance and will not damage the particle surface. Specifically, when the particles pass under the flexible comb roller 300 with the conveyor belt, the flexible comb teeth 310 comb and disperse the particle layer, forcibly separating the adhering particle clusters, while the flexible material of the comb teeth 310 will not damage the particle surface.

[0034] The flexible comb roller 300 is driven to rotate by a drive motor 320 mounted on the frame 140 of the stepped mesh belt 100. Specifically, the output shaft of the drive motor 320 is connected to the end of the flexible comb roller 300 via a transmission shaft. The drive motor 320 is fixedly mounted on the side of the frame 140 and drives the flexible comb roller 300 to rotate around its axis via the transmission shaft. The rotational linear velocity direction of the flexible comb roller 300 is the same as or opposite to the conveying direction of the stepped mesh belt 100: when the rotation direction is the same as the conveying direction, the flexible comb 310 generates a forward combing effect on the particle layer, which helps the particles to spread evenly; when the rotation direction is opposite to the conveying direction, the flexible comb 310 generates a reverse pushing effect on the particle layer, which enhances the effect of breaking up the agglomerated particle clusters. Depending on the degree of particle adhesion in the actual working conditions, the rotation direction of the flexible comb roller 300 can be flexibly selected or comb rollers with different rotation directions can be used in combination.

[0035] A blowing device 400 is located below the stepped conveyor belt 100. The blowing device 400 includes a blower box 410 mounted on the ground and a pulse control valve 420 mounted on the air inlet duct of the blower box 410. The blower box 410 has a box-like structure with multiple openings at its upper part. Each opening is connected to a vertically upward-extending guide pipe. The top of the guide pipe forms an air outlet 440, which is located directly below each stage of the conveyor belt 110. The end of the air outlet 440 can be a slit nozzle or a round-hole nozzle. The opening direction of the air outlet 440 faces the upward conveyor belt 110, allowing airflow to be distributed from the blower box 410 to each air outlet 440 through the guide pipe. Preferably, the blower box 410 located below the first stage conveyor belt 110 is close to the end of the first stage conveyor belt 110, so that its air outlet direction avoids the powder scattering direction. A pulse control valve 420 is installed on the air inlet duct at the air inlet of the air box 410. The pulse control valve 420 controls the airflow to intermittently blow out high-speed airflow in a pulse manner. After the airflow passes through the guide pipe and the air outlet 440 and passes through the breathable conveyor belt 110, the particles on the belt are suspended. The particles are cooled by the airflow while in a suspended state, and the collision and friction between the particles further prevents them from sticking together. Compared with continuous blowing, pulse blowing can produce a better tumbling effect with the same air consumption and avoids the particles being blown away by the continuous airflow. The blowing device 400 also includes a cooler 430 connected to the air box 410. The air outlet of the cooler 430 is connected to the air inlet of the air box 410 through a pipe. The cooler 430 supplies cooling airflow into the air box 410, and the temperature and airflow of the cooling airflow can be adjusted according to the cooling needs of the particles to achieve temperature-controlled cooling.

[0036] Furthermore, the cooling and anti-sticking system also includes a powder spreader 200, which is mounted above the first-stage feed end of the stepped mesh belt 100 via a bracket 230. One end of the bracket 230 is fixedly connected to the shell of the powder spreader 200, and the other end is fixed to the pelletizing mechanism 1000, so that the powder spreader 200 is suspended directly above the feed end of the first-stage conveyor chain 110. The powder spreader 200 includes a storage hopper 210 and a metering valve 220 located at the bottom of the storage hopper 210. The shell of the storage hopper 210 is conical, wider at the top and narrower at the bottom. Under the action of gravity, the powder converges towards the bottom along the inner wall of the cone, preventing the powder from bridging and accumulating on the inner wall of the hopper. At the same time, it can store anti-sticking and isolating powder. The bottom outlet of the storage hopper 210 is connected to the inlet of the metering valve 220. The anti-sticking and isolating powder is one or more of talc powder, calcium carbonate powder, and silica powder. A quantitative feed valve 220 is installed at the bottom outlet of the storage hopper 210. The quantitative feed valve 220 is a rotary valve or a screw feed valve, which controls the spreading rate of the isolation powder from the spreading port 240, so that the spreading rate matches the conveying speed of the stepped mesh belt 100. The surface of the freshly cut particles still has a high temperature and stickiness. Before or after falling into the stepped mesh belt 100, the powder spreader 200 spreads a layer of isolation powder onto the particle surface through the quantitative feed valve 220. The isolation powder is adsorbed onto the particle surface to form a coating layer, which physically prevents the adhesion between particles, so that a continuous isolation powder coating layer is formed on the particle surface.

[0037] In a preferred embodiment, the cone-shaped head at the bottom of the storage hopper 210 of the powder spreader 200 is obliquely cut to form an eccentric outlet. A quantitative feed valve 220 is installed at this eccentric outlet, causing the discharge direction of the spreading port 240 to be biased towards the initial drop direction of the particles, that is, the opening direction of the spreading port 240 is towards the pelletizing mechanism 1000. This ensures that the powder contacts the particle surface after the particles are cut by the pelletizing mechanism 1000 and before they fall into the stepped mesh belt 100, thus spreading the powder onto the particle surface. At the same time, the starting position of the air outlet 440 of the blowing device 400 is located at the end of the first-stage conveyor chain 110 of the stepped mesh belt 100, so that the blowing airflow effect is relatively small in the section from the feed end to the end of the first-stage conveyor chain 110. This spatial layout vertically separates the powder spreading area from the air cooling area. The powder spreader 200 completes the spreading of the isolation powder in an environment with weak upward airflow interference, avoiding the problems of powder loss, dust pollution and reduced anti-sticking effect caused by strong high-speed upward airflow blowing away the newly spread isolation powder that has not yet been completely adsorbed by particles.

[0038] In operation, the cooling and anti-sticking system of this invention cuts the hot particles by the pelletizing mechanism 1000. After the particles are separated by powder by the powder spreader 240, they fall onto the first-stage conveyor chain of the stepped mesh belt 100 and are conveyed step by step by the mesh belt. At the drop point of each stage of the conveyor chain 110, the particles tumble, so that all sides are evenly exposed to the cooling airflow. The flexible comb roller 300, which is set across each stage of the mesh belt, rotates under the drive of the drive motor 320 through the transmission shaft, combing and dispersing the passing particle layer and forcibly separating the adhering particle clusters. At the same time, the cooling fan 430 of the blowing device 400 supplies cooling airflow to the air box 410. The pulse control valve 420 controls the airflow to be blown out intermittently through the guide pipe and the air outlet 440. The airflow penetrates the breathable conveyor chain 110, so that the particles are completely wrapped and cooled in a suspended state. The entire process does not use water cooling, which effectively avoids the problems of moisture absorption and denaturation of solid waste powder and particle agglomeration, and finally outputs qualified finished product particles.

[0039] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A cooling and anti-sticking system for granulation of solid waste composite asphalt modifier, disposed below the material dropping area of ​​the pelletizing mechanism (1000) in the granulation device, characterized in that, include: The stepped mesh belt (100) is composed of multiple levels of breathable conveyor mesh chains (110) that overlap at both ends, with a gravity drop height difference between adjacent levels of conveyor mesh chains (110). Multiple flexible comb rollers (300) with their axes spanning above the stepped mesh belt (100) and perpendicular to the running direction of the stepped mesh belt (100). A blower (400) is located below the stepped mesh belt (100).

2. The cooling release system of claim 1, wherein The flexible comb roller (300) has flexible comb teeth (310) evenly distributed on its surface, and there is a gap between the end of the comb teeth (310) and the surface of the stepped mesh belt (100).

3. The cooling release system of claim 2, wherein The comb teeth (310) are made of silicone or nylon.

4. The cooling release system of claim 2, wherein The flexible comb roller (300) is driven by a drive motor (320) mounted on the frame of the stepped mesh belt (100), and the direction of the rotational linear velocity of the flexible comb roller (300) is the same as or opposite to the conveying direction of the stepped mesh belt (100).

5. The cooling and anti-sticking system according to claim 1, characterized in that, The blowing device (400) includes a wind box (410) located on the ground and a pulse control valve (420) located on the air inlet duct of the wind box (410).

6. The cooling release system of claim 5, wherein, The top of the bellows (410) is evenly provided with multiple air outlets (440).

7. The cooling release system of claim 6, wherein The blowing device (400) also includes a cooler (430) connected to the air box (410).

8. The cooling release system of claim 1, wherein The cooling and anti-sticking system also includes a powder spreader (200) installed at the first feeding end of the stepped mesh belt (100) via a bracket (230), wherein the discharge direction of the spreading port (240) at the bottom of the powder spreader (200) is biased toward the initial falling direction of the particles.

9. The cooling release system of claim 8, wherein, The powder spreader (200) includes a storage hopper (210) and a metering valve (220) located at the bottom of the storage hopper (210).

10. The cooling and anti-sticking system according to claim 1, characterized in that, The mesh size of the conveyor chain (110) is 0.5mm to 2mm.

Images