RAP fine separation oil-rich fine aggregate drying and heating equipment

Abstract

The utility model belongs to the technical field of old asphalt pavement milling material regeneration equipment, and relates to aggregate drying and heating equipment, in particular to RAP fine separation oil-rich fine aggregate drying and heating equipment, which mainly solves the influence of high water content in RAP fine separation oil-rich fine aggregate on the energy consumption of an asphalt mixing station and ensures the quality of a regenerated asphalt mixture. The equipment comprises a feeding device, a belt conveying device, a drying and heating box, a box body supporting system, a discharging device and an electric control system. The equipment can quickly dry water in the oil-rich fine aggregate, can also heat the oil-rich fine aggregate to any temperature required by the production of the recycled asphalt mixture, can effectively improve the use ratio of RAP and the pavement performance of the recycled asphalt mixture, and has the advantages of simple structure, convenience in use, no adhesion with asphalt, high thermal efficiency and low production cost.

Description

[0001] manual Technical Field

[0002] The utility model belongs to the technical field of equipment for recycling milling material of old asphalt pavement, and relates to an aggregate drying and heating device, in particular to a RAP fine separation oil-rich fine aggregate drying and heating device, which mainly solves the influence of high water content in RAP fine separation oil-rich fine aggregate on the energy consumption of asphalt mixing station and ensures the quality of recycled asphalt mixture. Technical Background

[0003] The recycling technology of old asphalt pavement milling material (hereinafter referred to as: RAP) has been vigorously promoted and applied because it can save raw materials such as asphalt and sand and gravel, and is conducive to the treatment of waste materials and environmental protection, with significant economic and social environmental benefits. At present, there are four main technologies for the recycling of RAP at home and abroad: factory-mixed hot recycling, on-site hot recycling, factory-mixed cold recycling, and on-site cold recycling. The factory-mixed hot recycling technology is a recycling technology that can achieve the recovery of the performance of aged asphalt in RAP, the graded utilization of aggregates, and the relatively uniform performance of the recycled mixture.

[0004] At present, the traditional factory-mixed hot recycling technology is to simply crush RAP, screen it into three grades of materials: 0-5mm, 5-10mm and above 10mm. After the three grades of materials are heated to 120-140℃ by the high-position drum of the asphalt mixing station at the same time, they are mixed with new aggregates, new asphalt, regeneration agent, etc. at a certain ratio at a specific temperature and time to obtain recycled asphalt mixture. However, the general addition ratio of RAP is below 30%, and the quality is unstable, the use level is low, and the construction process is mainly controlled by experience, which affects the utilization value of the recycled materials and the economic benefits are not objective. The main reasons are: on the one hand, each level of RAP after traditional crushing and screening is still a mixture of old asphalt and old aggregate, and there are still a large number of fine aggregate agglomerates (commonly known as: false particles or false large particles or false particle size), which are neither aggregates nor asphalt. The material state is extremely unstable. When added in large proportions, the volatility of the grading and oil-stone ratio of the recycled mixture is far beyond the allowable range, and the comprehensive performance of the mixture is not good; on the other hand, the content of old asphalt in each level of RAP after traditional crushing and screening is between 4% and 5%, which is too high. When the temperature exceeds the softening point of the aged asphalt during high-position drum heating, it is very easy for RAP to adhere to the high-position drum. The higher the temperature, the more obvious the adhesion. Therefore, the heating temperature is generally 40-50°C different from the temperature required for the recycled mixture product, and fresh aggregate needs to be heated to a higher temperature to compensate, but the compensation of fresh aggregate is not unlimited. Fresh aggregate is easy to disintegrate after reaching a certain temperature.

[0005] In order to increase the proportion of RAP added in the plant-mixed hot recycling technology, a fine separator is used to separate the asphalt film on the surface of the RAP coarse aggregate from the aggregate, forming four types of oil-poor coarse aggregates of 3-5mm, 5-10mm, 10-15mm and above 15mm; the asphalt film is used to form oil-rich fine aggregate in 0-3mm RAP. Compared with the traditional plant-mixed hot recycling technology, the fine separation technology can effectively eliminate the false particles in the RAP coarse aggregate and reduce the residual asphalt content. The heating and use methods of the oil-poor coarse aggregate are the same as those of the new aggregate, and the addition ratio is not restricted. However, a large amount of aged asphalt remains in the fine aggregate, making the asphalt content of the fine aggregate greater than 7%, or even more than 10%. If the high-temperature roller of the mixing station is still used for heating, large-area adhesion will occur, causing the equipment to be blocked and unable to operate normally. In order to solve the adhesion problem, the conventional method currently used is not to heat the 0-3mm oil-rich fine aggregate when producing factory-mixed hot recycled asphalt mixture, but to add it to the mixing tank of the asphalt mixing station at room temperature in an amount less than 15%. By increasing the temperature of the coarse aggregate, on the one hand, the moisture in the oil-rich fine aggregate is evaporated, and on the other hand, the temperature of the oil-rich fine aggregate is compensated to make it reach the 160-180℃ required for the factory-mixed hot recycled asphalt mixture.

[0006] Based on the above reasons, although the fine separation technology solves the application problem of coarse aggregate in traditional factory-mixed hot recycling technology and increases the use ratio of RAP to a certain extent, it still cannot increase the use and addition ratio of oil-rich fine aggregate with high old asphalt content and highest economic value, and even makes it impossible to heat the oil-rich fine aggregate, which seriously affects the quality of recycled asphalt mixture and the economic benefits cannot be fully explored. Therefore, how to achieve the drying and heating of RAP oil-rich fine aggregate is the key to determining the addition ratio, use value and road performance of RAP recycled asphalt mixture. Utility Model Content

[0007] The purpose of this utility model is to develop a drying and heating device for RAP finely separated oil-rich fine aggregates in view of the process defect that the finely separated fine aggregates of the above-mentioned old asphalt pavement milling materials can only be used for cold throwing at room temperature when mixing hot recycled asphalt mixtures in the production plant. This equipment can quickly dry the moisture in the oil-rich fine aggregates, and can heat the oil-rich fine aggregates to any temperature required for the production of recycled asphalt mixtures, which can effectively improve the use ratio of RAP and the road performance of recycled asphalt mixtures, and has the advantages of simple structure, easy use, no adhesion to asphalt, high thermal efficiency and low production cost.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0009] A RAP fine separation oil-rich fine aggregate drying and heating device comprises the following devices: a feeding device, a belt conveyor device, a drying and heating box, a box support system, a discharging device, and an electric control system.

[0010] The feeding device comprises a support frame and a feeding hopper; the feeding hopper is placed on the support frame; an anti-blocking screen is provided at the bottom of the feeding hopper, and a discharge port is provided at the bottom of the feeding hopper; a belt feeder is provided directly below the discharge port; a belt conveyor is provided directly below the belt feeder, and the belt conveyor is connected to the drying and heating box through the feeding port;

[0011] The drying and heating box is placed directly above the box support system;

[0012] The drying and heating box includes a multi-layer conveyor mesh belt, a feed port, a discharge port, a heating source, an exhaust fan, a cleaning hole, a temperature sensor, and a moisture meter; the drying and heating box is placed on a box support system, a feed port is provided at the upper right corner of the drying and heating box, and a discharge port is provided at the lower left corner of the drying and heating box; the multi-layer conveyor mesh belt is placed inside the drying and heating box, and the material conveying direction of each layer of the multi-layer conveyor mesh belt from top to bottom is opposite, and the lower conveyor mesh belt of the multi-layer conveyor mesh belt receives and transports the material of the upper conveyor mesh belt from top to bottom, and the multi-layer conveyor mesh belt A distributor is provided at the starting end of each layer of the conveyor mesh belt along the material forward direction; the heating source is placed directly below each layer of the conveyor mesh belt, and the heating sources are symmetrically arranged in two rows in the drying and heating box along the width direction of the multi-layer conveyor mesh belt; the exhaust fan is placed on the top plate of the drying and heating box; the cleaning hole is placed on the bottom plate of the drying and heating box; the temperature sensor is placed on the left side of the drying and heating box; the moisture meter is placed on the right side of the drying and heating box; the bottom layer of the multi-layer conveyor mesh belt from top to bottom is connected to the discharging device through the discharging port;

[0013] The discharging device comprises a receiving hopper, a screw conveyor and a support frame; the screw conveyor is placed on the support frame, and a receiving hopper is arranged directly below the screw conveyor; the receiving hopper is located directly below the end of the bottom conveyor mesh belt;

[0014] The electric control system is connected to the temperature sensor, moisture meter, heating source and power motor in the equipment;

[0015] Furthermore, the drying and heating box is made of high temperature resistant steel, and the outside of the high temperature resistant steel is wrapped with insulation material;

[0016] Furthermore, the multi-layer conveyor belt is made of a crawler-type high-temperature resistant steel plate perforated mesh, the surface of the crawler-type high-temperature resistant steel plate perforated mesh is attached with a silicone material, the silicone material can withstand a high temperature of more than 800°C, and the aperture of the high-temperature steel plate perforated mesh is less than or equal to 0.6mm;

[0017] Furthermore, each layer of the multi-layer conveyor mesh belt is a closed ring structure; each layer of the conveyor mesh belt is driven by an electric roller; and a transmission roller is provided under each layer of the conveyor mesh belt;

[0018] Furthermore, each layer of the closed loop conveyor mesh belt of the multi-layer conveyor mesh belt is provided with a vibrator;

[0019] Furthermore, the distributor is a spike rake structure, which evenly distributes the material on the multi-layer conveyor belt;

[0020] Furthermore, the heating source is a gas furnace or an electric furnace, and each heating source in the drying and heating box is independently controlled by an electric control system;

[0021] Further, the temperature sensor has a range of 0-300°C;

[0022] Furthermore, the moisture measuring instrument adopts a millimeter wave moisture sensor;

[0023] Furthermore, the outer side of the screw conveyor is wrapped by a heat-insulating material, and the outer side of the receiving hopper is wrapped by a heat-insulating material.

[0024] The utility model discloses a RAP fine separation fine aggregate drying and heating equipment having the following working principles: the oil-rich fine aggregate enters the belt conveyor from the discharge port of the feeding device; the belt conveyor transports the material to the multi-layer conveying net in the drying and heating box, and the material is evenly distributed on the conveying net belt through the distributor; the material directly contacts the hot air generated by the heat source during the forward movement, and the material on the net belt is dried and heated through the turning of the net belt vibrator; the exhaust fan discharges the air after the heat exchange out of the drying and heating box; the electric control system can independently adjust the heat output of each heating source, the rotation speed of the conveying net belt and the rotation speed of the belt conveyor through the data provided by the temperature sensor and the moisture meter, so that the discharge temperature meets the set value; the material to be dried finally enters the discharge device from the discharge port of the drying and heating box, and the drying and heating of the material is completed.

[0025] Compared with the prior art, the RAP fine separation and fine aggregate heating and drying equipment developed by the utility model has the following beneficial effects:

[0026] 1. The multi-layer conveyor belt dries and heats the materials. The equipment has a compact structure, and the materials are dried and heated in a continuous manner. It has a large output and a fast heating speed, and can meet the demand for oil-rich fine aggregates in large-scale production of recycled asphalt mixtures;

[0027] 2. The oil-rich fine aggregate is transported by a vibrating mesh belt during the heating process. At the same time, the surface of the conveying mesh belt is attached with high-temperature resistant silicone material, so that the oil-rich fine aggregate in a high-temperature state does not adhere to the mesh belt, and the heating temperature of the oil-rich fine aggregate is not limited, ensuring the temperature requirements when a large proportion of oil-rich fine aggregate is added;

[0028] 3. The temperature sensor and moisture meter work together to ensure the complete removal of residual moisture in the oil-rich fine aggregate, the minimum temperature requirement for the oil-rich fine aggregate in the production process of recycled asphalt mixture, and the oil-rich fine aggregate is not heated to too high a temperature to cause secondary aging of asphalt;

[0029] 4. The distributor can evenly distribute the oil-rich fine aggregate on the conveyor belt with a specific thickness, so that the contact area between the oil-rich fine aggregate and the hot air is increased, and the temperature of the oil-rich fine aggregate can reach the set value at the fastest speed;

[0030] 5. The electronic control system can independently adjust the heat output of each heating source, the rotation speed of the conveyor belt and the rotation speed of the belt conveyor through the data provided by the temperature sensor and the moisture meter, so that the discharge temperature meets the set value. It has a high degree of automation and saves time and effort during the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0032] Figure 1 This is a schematic diagram of the structure of the RAP fine separation and drying and heating equipment provided by the utility model;

[0033] Figure 2 for Figure 1 A schematic diagram of a top view structure;

[0034] Figure 3 This is a schematic diagram of the structure of the distributor from a top view;

[0035] Figure 4 This is a schematic diagram of the facade structure of the distributor.

[0036] The corresponding markings in the figure are as follows: upper hopper 1; anti-blocking screen 2; support frame 3; belt feeder 4; belt conveyor 5; material conveying direction 6; exhaust fan 7; electronic control system 8; multi-layer conveyor belt 9; moisture meter 10; temperature sensor 11; distributor 12; transmission roller 13; vibrator 14; electric roller 15; box support system 16; drying and heating box 17; heating source 18; screw conveyor 19; receiving hopper 20; support frame 21; cleaning hole 22; feed port 23; discharge port 24; unloading port 25. Specific embodiments

[0037] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in combination with the embodiment of the utility model and the accompanying drawings. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] In the description of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the use of "first", "second" and similar words does not indicate any order, quantity or importance, but is only used to distinguish different components. The use of "above" means that the specification is greater than or equal to a certain value, and "below" means that the specification is less than a certain value.

[0039] Example 1

[0040] Reference Figures 1 to 3 As shown, a RAP fine separation fine aggregate heating and drying equipment includes the following devices: a feeding device, a belt conveyor device 5, a drying and heating box 17, a box support system 16, a discharging device, and an electronic control system 8.

[0041] The feeding device comprises a support frame 3 and a feeding hopper 1; the feeding hopper 1 is placed on the support frame 3; an anti-blocking screen 2 is provided at the bottom of the feeding hopper 1, and a discharge port 25 is provided at the bottom of the feeding hopper 1; a belt feeder 4 is provided directly below the discharge port 25; a belt conveyor 5 is provided directly below the belt feeder 4, and the belt conveyor 5 is connected to the drying and heating box 17 through the feeding port 23;

[0042] The drying and heating box is placed 17 directly above the box support system 16;

[0043] The drying and heating box 17 includes a multi-layer conveyor mesh belt 9, a feed port 23, a discharge port 24, a heating source 18, an exhaust fan 7, a cleaning hole 22, a temperature sensor 11, and a moisture meter 10; the drying and heating box 17 is placed on the box support system, the upper right corner of the drying and heating box 17 is provided with a feed port 23, and the lower left corner of the drying and heating box 17 is provided with a discharge port 24; the multi-layer conveyor mesh belt 9 is placed inside the drying and heating box, and the material conveying direction of each layer of the multi-layer conveyor mesh belt 9 from top to bottom is opposite, and the lower conveyor mesh belt of the multi-layer conveyor mesh belt 9 receives and transports the material of the upper conveyor mesh belt from top to bottom. A distributor 12 is provided at the starting end of each layer of the multi-layer conveyor mesh belt 9 along the material forward direction; the heating source 18 is placed directly below each layer of the conveyor mesh belt, and the heating source 18 is symmetrically arranged in two rows in the drying and heating box 9 along the width direction of the multi-layer conveyor mesh belt 9; the exhaust fan 7 is placed on the top plate of the drying and heating box 17; the cleaning hole 22 is placed on the bottom plate of the drying and heating box 17; the temperature sensor 11 is placed on the left side of the drying and heating box 17; the moisture meter 10 is placed on the right side of the drying and heating box 17; the bottom layer of the multi-layer conveyor mesh belt 9 from top to bottom is connected to the discharging device through the discharging port 24;

[0044] The discharging device comprises a receiving hopper 20, a screw conveyor 19, and a support frame 21; the screw conveyor 19 is placed on the support frame 21, and a receiving hopper 20 is provided directly below the screw conveyor 19; the receiving hopper 20 is located directly below the end of the bottom conveyor mesh belt;

[0045] The electric control system 8 is connected to the temperature sensor 11, the moisture meter 10, the heating source 18, and the power motor of the multi-layer conveyor mesh belt 9 in the equipment;

[0046] Furthermore, the body of the drying and heating box 17 is made of high temperature resistant steel, and the outside of the high temperature resistant steel is wrapped with a heat insulation material;

[0047] Furthermore, the multi-layer conveyor belt 9 is made of a crawler-type high-temperature resistant steel plate perforated mesh, the surface of which is attached with a silicone material, the silicone material can withstand a high temperature of 900°C, and the aperture of the high-temperature steel plate perforated mesh is 0.6mm;

[0048] Furthermore, each layer of the multi-layer conveyor mesh belt 9 is a closed ring structure; each layer of the conveyor mesh belt is driven by an electric roller 15; and a transmission roller 18 is provided under each layer of the conveyor mesh belt;

[0049] Furthermore, each layer of the closed loop conveyor mesh belt of the multi-layer conveyor mesh belt 9 is provided with a vibrator 14;

[0050] Furthermore, the distributor 12 is a spike rake structure, which evenly distributes the material on the multi-layer conveyor belt 9;

[0051] Further, the heating source 18 is a gas furnace, and each heating source 18 in the drying and heating box 17 is independently controlled by the electric control system 8;

[0052] Further, the measuring range of the temperature sensor 11 is 0-300°C;

[0053] Furthermore, the moisture meter 10 uses a millimeter wave moisture sensor;

[0054] Furthermore, the outer side of the screw conveyor 19 is wrapped by a heat-insulating material, and the outer side of the receiving hopper 20 is wrapped by a heat-insulating material.

[0055] Example 2

[0056] Reference Figures 1 to 3 As shown, a RAP fine separation fine aggregate heating and drying equipment includes the following devices: a feeding device, a belt conveyor device 5, a drying and heating box 17, a box support system 16, a discharging device, and an electronic control system 8.

[0057] The feeding device comprises a support frame 3 and a feeding hopper 1; the feeding hopper 1 is placed on the support frame 3; an anti-blocking screen 2 is provided at the bottom of the feeding hopper 1, and a discharge port 25 is provided at the bottom of the feeding hopper 1; a belt feeder 4 is provided directly below the discharge port 25; a belt conveyor 5 is provided directly below the belt feeder 4, and the belt conveyor 5 is connected to the drying and heating box 17 through the feeding port 23;

[0058] The drying and heating box is placed 17 directly above the box support system 16;

[0059] The drying and heating box 17 includes a multi-layer conveyor mesh belt 9, a feed port 23, a discharge port 24, a heating source 18, an exhaust fan 7, a cleaning hole 22, a temperature sensor 11, and a moisture meter 10; the drying and heating box 17 is placed on the box support system, the upper right corner of the drying and heating box 17 is provided with a feed port 23, and the lower left corner of the drying and heating box 17 is provided with a discharge port 24; the multi-layer conveyor mesh belt 9 is placed inside the drying and heating box, and the material conveying direction of each layer of the multi-layer conveyor mesh belt 9 from top to bottom is opposite, and the lower conveyor mesh belt of the multi-layer conveyor mesh belt 9 receives and transports the material of the upper conveyor mesh belt from top to bottom. A distributor 12 is provided at the starting end of each layer of the multi-layer conveyor mesh belt 9 along the material forward direction; the heating source 18 is placed directly below each layer of the conveyor mesh belt, and the heating source 18 is symmetrically arranged in two rows in the drying and heating box 9 along the width direction of the multi-layer conveyor mesh belt 9; the exhaust fan 7 is placed on the top plate of the drying and heating box 17; the cleaning hole 22 is placed on the bottom plate of the drying and heating box 17; the temperature sensor 11 is placed on the left side of the drying and heating box 17; the moisture meter 10 is placed on the right side of the drying and heating box 17; the bottom layer of the multi-layer conveyor mesh belt 9 from top to bottom is connected to the discharging device through the discharging port 24;

[0060] The discharging device comprises a receiving hopper 20, a screw conveyor 19, and a support frame 21; the screw conveyor 19 is placed on the support frame 21, and a receiving hopper 20 is provided directly below the screw conveyor 19; the receiving hopper 20 is located directly below the end of the bottom conveyor mesh belt;

[0061] The electric control system 8 is connected to the temperature sensor 11, the moisture meter 10, the heating source 18, and the power motor of the multi-layer conveyor mesh belt 9 in the equipment;

[0062] Furthermore, the body of the drying and heating box 17 is made of high temperature resistant steel, and the outside of the high temperature resistant steel is wrapped with a heat insulation material;

[0063] Furthermore, the multi-layer conveyor belt 9 is made of a crawler-type high-temperature resistant steel plate perforated mesh, the surface of which is attached with a silicone material, the silicone material can withstand a high temperature of 850° C., and the aperture of the high-temperature steel plate perforated mesh is 0.3 mm;

[0064] Furthermore, each layer of the multi-layer conveyor mesh belt 9 is a closed ring structure; each layer of the conveyor mesh belt is driven by an electric roller 15; and a transmission roller 18 is provided under each layer of the conveyor mesh belt;

[0065] Furthermore, each layer of the closed loop conveyor mesh belt of the multi-layer conveyor mesh belt 9 is provided with a vibrator 14;

[0066] Furthermore, the distributor 12 is a spike rake structure, which evenly distributes the material on the multi-layer conveyor belt 9;

[0067] Further, the heating source 18 is an electric furnace, and each heating source 18 in the drying and heating box 17 is independently controlled by the electric control system 8;

[0068] Further, the measuring range of the temperature sensor 11 is 0-300°C;

[0069] Furthermore, the moisture meter 10 uses a millimeter wave moisture sensor;

[0070] Furthermore, the outer side of the screw conveyor 19 is wrapped by a heat-insulating material, and the outer side of the receiving hopper 20 is wrapped by a heat-insulating material.

[0071] Although the terms such as RAP, oil-rich fine aggregate, feeder, multi-layer conveyor belt, discharge port, feed port, distributor, temperature sensor, moisture meter, receiving hopper, cleaning hole, discharge port, loading device, discharge device, vibrator, etc. are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A RAP fine separation oil-rich fine aggregate drying and heating equipment, characterized by: It includes the following devices: feeding device, belt conveyor, drying and heating box, box support system, discharging device, and electronic control system; The feeding device comprises a support frame and a feeding hopper; the feeding hopper is placed on the support frame; an anti-blocking screen is provided at the bottom of the feeding hopper, and a discharge port is provided at the bottom of the feeding hopper; a belt feeder is provided directly below the discharge port; a belt conveyor is provided directly below the belt feeder, and the belt conveyor is connected to the drying and heating box through the feeding port; The drying and heating box is placed directly above the box support system; The drying and heating box includes a multi-layer conveyor mesh belt, a feed port, a discharge port, a heating source, an exhaust fan, a cleaning hole, a temperature sensor, and a moisture meter; the drying and heating box is placed on a box support system, a feed port is provided at the upper right corner of the drying and heating box, and a discharge port is provided at the lower left corner of the drying and heating box; the multi-layer conveyor mesh belt is placed inside the drying and heating box, and the material conveying direction of each layer of the multi-layer conveyor mesh belt from top to bottom is opposite, and the lower conveyor mesh belt of the multi-layer conveyor mesh belt receives and transports the material of the upper conveyor mesh belt from top to bottom, and the multi-layer conveyor mesh belt A distributor is provided at the starting end of each layer of the conveyor mesh belt along the material forward direction; the heating source is placed directly below each layer of the conveyor mesh belt, and the heating sources are symmetrically arranged in two rows in the drying and heating box along the width direction of the multi-layer conveyor mesh belt; the exhaust fan is placed on the top plate of the drying and heating box; the cleaning hole is placed on the bottom plate of the drying and heating box; the temperature sensor is placed on the left side of the drying and heating box; the moisture meter is placed on the right side of the drying and heating box; the bottom layer of the multi-layer conveyor mesh belt from top to bottom is connected to the discharging device through the discharging port; The discharging device comprises a receiving hopper, a screw conveyor and a support frame; the screw conveyor is placed on the support frame, and a receiving hopper is arranged directly below the screw conveyor; the receiving hopper is located directly below the end of the bottom conveyor mesh belt; The electric control system is connected to the temperature sensor, moisture meter, heating source and power motor in the equipment; Furthermore, the drying and heating box is made of high temperature resistant steel, and the outside of the high temperature resistant steel is wrapped with insulation material; Furthermore, the multi-layer conveyor belt is made of a crawler-type high-temperature resistant steel plate perforated mesh, the surface of the crawler-type high-temperature resistant steel plate perforated mesh is attached with a silicone material, the silicone material can withstand a high temperature of more than 800°C, and the aperture of the high-temperature steel plate perforated mesh is less than or equal to 0.6mm; Furthermore, each layer of the multi-layer conveyor mesh belt is a closed ring structure; each layer of the conveyor mesh belt is driven by an electric roller; and a transmission roller is provided under each layer of the conveyor mesh belt; Furthermore, each layer of the closed loop conveyor mesh belt of the multi-layer conveyor mesh belt is provided with a vibrator; Furthermore, the distributor is a spike rake structure, which evenly distributes the materials on the multi-layer conveyor belt; Furthermore, the heating source is a gas furnace or an electric furnace, and each heating source in the drying and heating box is independently controlled by an electric control system; Further, the temperature sensor has a range of 0-300°C; Furthermore, the moisture measuring instrument adopts a millimeter wave moisture sensor; Furthermore, the outer side of the screw conveyor is wrapped by a heat-insulating material, and the outer side of the receiving hopper is wrapped by a heat-insulating material.

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